* [PATCH v6 1/9] target/arm: Introduce curr_insn_len
2022-10-06 3:38 [PATCH v6 0/9] target/arm: pc-relative translation blocks Richard Henderson
@ 2022-10-06 3:38 ` Richard Henderson
2022-10-06 3:38 ` [PATCH v6 2/9] target/arm: Change gen_goto_tb to work on displacements Richard Henderson
` (7 subsequent siblings)
8 siblings, 0 replies; 12+ messages in thread
From: Richard Henderson @ 2022-10-06 3:38 UTC (permalink / raw)
To: qemu-devel; +Cc: qemu-arm, Philippe Mathieu-Daudé
A simple helper to retrieve the length of the current insn.
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/arm/translate.h | 5 +++++
target/arm/translate-vfp.c | 2 +-
target/arm/translate.c | 5 ++---
3 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/target/arm/translate.h b/target/arm/translate.h
index af5d4a7086..90bf7c57fc 100644
--- a/target/arm/translate.h
+++ b/target/arm/translate.h
@@ -226,6 +226,11 @@ static inline void disas_set_insn_syndrome(DisasContext *s, uint32_t syn)
s->insn_start = NULL;
}
+static inline int curr_insn_len(DisasContext *s)
+{
+ return s->base.pc_next - s->pc_curr;
+}
+
/* is_jmp field values */
#define DISAS_JUMP DISAS_TARGET_0 /* only pc was modified dynamically */
/* CPU state was modified dynamically; exit to main loop for interrupts. */
diff --git a/target/arm/translate-vfp.c b/target/arm/translate-vfp.c
index bd5ae27d09..94cc1e4b77 100644
--- a/target/arm/translate-vfp.c
+++ b/target/arm/translate-vfp.c
@@ -242,7 +242,7 @@ static bool vfp_access_check_a(DisasContext *s, bool ignore_vfp_enabled)
if (s->sme_trap_nonstreaming) {
gen_exception_insn(s, s->pc_curr, EXCP_UDEF,
syn_smetrap(SME_ET_Streaming,
- s->base.pc_next - s->pc_curr == 2));
+ curr_insn_len(s) == 2));
return false;
}
diff --git a/target/arm/translate.c b/target/arm/translate.c
index 5aaccbbf71..42e11102f7 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -6654,7 +6654,7 @@ static ISSInfo make_issinfo(DisasContext *s, int rd, bool p, bool w)
/* ISS not valid if writeback */
if (p && !w) {
ret = rd;
- if (s->base.pc_next - s->pc_curr == 2) {
+ if (curr_insn_len(s) == 2) {
ret |= ISSIs16Bit;
}
} else {
@@ -9817,8 +9817,7 @@ static void arm_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
/* nothing more to generate */
break;
case DISAS_WFI:
- gen_helper_wfi(cpu_env,
- tcg_constant_i32(dc->base.pc_next - dc->pc_curr));
+ gen_helper_wfi(cpu_env, tcg_constant_i32(curr_insn_len(dc)));
/*
* The helper doesn't necessarily throw an exception, but we
* must go back to the main loop to check for interrupts anyway.
--
2.34.1
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH v6 2/9] target/arm: Change gen_goto_tb to work on displacements
2022-10-06 3:38 [PATCH v6 0/9] target/arm: pc-relative translation blocks Richard Henderson
2022-10-06 3:38 ` [PATCH v6 1/9] target/arm: Introduce curr_insn_len Richard Henderson
@ 2022-10-06 3:38 ` Richard Henderson
2022-10-06 3:38 ` [PATCH v6 3/9] target/arm: Change gen_*set_pc_im to gen_*update_pc Richard Henderson
` (6 subsequent siblings)
8 siblings, 0 replies; 12+ messages in thread
From: Richard Henderson @ 2022-10-06 3:38 UTC (permalink / raw)
To: qemu-devel; +Cc: qemu-arm, Peter Maydell
In preparation for TARGET_TB_PCREL, reduce reliance on absolute values.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/arm/translate-a64.c | 40 ++++++++++++++++++++------------------
target/arm/translate.c | 10 ++++++----
2 files changed, 27 insertions(+), 23 deletions(-)
diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index 78b2d91ed4..8f5c2675f7 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -378,8 +378,10 @@ static inline bool use_goto_tb(DisasContext *s, uint64_t dest)
return translator_use_goto_tb(&s->base, dest);
}
-static inline void gen_goto_tb(DisasContext *s, int n, uint64_t dest)
+static void gen_goto_tb(DisasContext *s, int n, int64_t diff)
{
+ uint64_t dest = s->pc_curr + diff;
+
if (use_goto_tb(s, dest)) {
tcg_gen_goto_tb(n);
gen_a64_set_pc_im(dest);
@@ -1362,7 +1364,7 @@ static inline AArch64DecodeFn *lookup_disas_fn(const AArch64DecodeTable *table,
*/
static void disas_uncond_b_imm(DisasContext *s, uint32_t insn)
{
- uint64_t addr = s->pc_curr + sextract32(insn, 0, 26) * 4;
+ int64_t diff = sextract32(insn, 0, 26) * 4;
if (insn & (1U << 31)) {
/* BL Branch with link */
@@ -1371,7 +1373,7 @@ static void disas_uncond_b_imm(DisasContext *s, uint32_t insn)
/* B Branch / BL Branch with link */
reset_btype(s);
- gen_goto_tb(s, 0, addr);
+ gen_goto_tb(s, 0, diff);
}
/* Compare and branch (immediate)
@@ -1383,14 +1385,14 @@ static void disas_uncond_b_imm(DisasContext *s, uint32_t insn)
static void disas_comp_b_imm(DisasContext *s, uint32_t insn)
{
unsigned int sf, op, rt;
- uint64_t addr;
+ int64_t diff;
TCGLabel *label_match;
TCGv_i64 tcg_cmp;
sf = extract32(insn, 31, 1);
op = extract32(insn, 24, 1); /* 0: CBZ; 1: CBNZ */
rt = extract32(insn, 0, 5);
- addr = s->pc_curr + sextract32(insn, 5, 19) * 4;
+ diff = sextract32(insn, 5, 19) * 4;
tcg_cmp = read_cpu_reg(s, rt, sf);
label_match = gen_new_label();
@@ -1399,9 +1401,9 @@ static void disas_comp_b_imm(DisasContext *s, uint32_t insn)
tcg_gen_brcondi_i64(op ? TCG_COND_NE : TCG_COND_EQ,
tcg_cmp, 0, label_match);
- gen_goto_tb(s, 0, s->base.pc_next);
+ gen_goto_tb(s, 0, 4);
gen_set_label(label_match);
- gen_goto_tb(s, 1, addr);
+ gen_goto_tb(s, 1, diff);
}
/* Test and branch (immediate)
@@ -1413,13 +1415,13 @@ static void disas_comp_b_imm(DisasContext *s, uint32_t insn)
static void disas_test_b_imm(DisasContext *s, uint32_t insn)
{
unsigned int bit_pos, op, rt;
- uint64_t addr;
+ int64_t diff;
TCGLabel *label_match;
TCGv_i64 tcg_cmp;
bit_pos = (extract32(insn, 31, 1) << 5) | extract32(insn, 19, 5);
op = extract32(insn, 24, 1); /* 0: TBZ; 1: TBNZ */
- addr = s->pc_curr + sextract32(insn, 5, 14) * 4;
+ diff = sextract32(insn, 5, 14) * 4;
rt = extract32(insn, 0, 5);
tcg_cmp = tcg_temp_new_i64();
@@ -1430,9 +1432,9 @@ static void disas_test_b_imm(DisasContext *s, uint32_t insn)
tcg_gen_brcondi_i64(op ? TCG_COND_NE : TCG_COND_EQ,
tcg_cmp, 0, label_match);
tcg_temp_free_i64(tcg_cmp);
- gen_goto_tb(s, 0, s->base.pc_next);
+ gen_goto_tb(s, 0, 4);
gen_set_label(label_match);
- gen_goto_tb(s, 1, addr);
+ gen_goto_tb(s, 1, diff);
}
/* Conditional branch (immediate)
@@ -1444,13 +1446,13 @@ static void disas_test_b_imm(DisasContext *s, uint32_t insn)
static void disas_cond_b_imm(DisasContext *s, uint32_t insn)
{
unsigned int cond;
- uint64_t addr;
+ int64_t diff;
if ((insn & (1 << 4)) || (insn & (1 << 24))) {
unallocated_encoding(s);
return;
}
- addr = s->pc_curr + sextract32(insn, 5, 19) * 4;
+ diff = sextract32(insn, 5, 19) * 4;
cond = extract32(insn, 0, 4);
reset_btype(s);
@@ -1458,12 +1460,12 @@ static void disas_cond_b_imm(DisasContext *s, uint32_t insn)
/* genuinely conditional branches */
TCGLabel *label_match = gen_new_label();
arm_gen_test_cc(cond, label_match);
- gen_goto_tb(s, 0, s->base.pc_next);
+ gen_goto_tb(s, 0, 4);
gen_set_label(label_match);
- gen_goto_tb(s, 1, addr);
+ gen_goto_tb(s, 1, diff);
} else {
/* 0xe and 0xf are both "always" conditions */
- gen_goto_tb(s, 0, addr);
+ gen_goto_tb(s, 0, diff);
}
}
@@ -1637,7 +1639,7 @@ static void handle_sync(DisasContext *s, uint32_t insn,
* any pending interrupts immediately.
*/
reset_btype(s);
- gen_goto_tb(s, 0, s->base.pc_next);
+ gen_goto_tb(s, 0, 4);
return;
case 7: /* SB */
@@ -1649,7 +1651,7 @@ static void handle_sync(DisasContext *s, uint32_t insn,
* MB and end the TB instead.
*/
tcg_gen_mb(TCG_MO_ALL | TCG_BAR_SC);
- gen_goto_tb(s, 0, s->base.pc_next);
+ gen_goto_tb(s, 0, 4);
return;
default:
@@ -14955,7 +14957,7 @@ static void aarch64_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
switch (dc->base.is_jmp) {
case DISAS_NEXT:
case DISAS_TOO_MANY:
- gen_goto_tb(dc, 1, dc->base.pc_next);
+ gen_goto_tb(dc, 1, 4);
break;
default:
case DISAS_UPDATE_EXIT:
diff --git a/target/arm/translate.c b/target/arm/translate.c
index 42e11102f7..6855128fb1 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -2594,8 +2594,10 @@ static void gen_goto_ptr(void)
* cpu_loop_exec. Any live exit_requests will be processed as we
* enter the next TB.
*/
-static void gen_goto_tb(DisasContext *s, int n, target_ulong dest)
+static void gen_goto_tb(DisasContext *s, int n, int diff)
{
+ target_ulong dest = s->pc_curr + diff;
+
if (translator_use_goto_tb(&s->base, dest)) {
tcg_gen_goto_tb(n);
gen_set_pc_im(s, dest);
@@ -2629,7 +2631,7 @@ static inline void gen_jmp_tb(DisasContext *s, uint32_t dest, int tbno)
* gen_jmp();
* on the second call to gen_jmp().
*/
- gen_goto_tb(s, tbno, dest);
+ gen_goto_tb(s, tbno, dest - s->pc_curr);
break;
case DISAS_UPDATE_NOCHAIN:
case DISAS_UPDATE_EXIT:
@@ -9798,7 +9800,7 @@ static void arm_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
switch (dc->base.is_jmp) {
case DISAS_NEXT:
case DISAS_TOO_MANY:
- gen_goto_tb(dc, 1, dc->base.pc_next);
+ gen_goto_tb(dc, 1, curr_insn_len(dc));
break;
case DISAS_UPDATE_NOCHAIN:
gen_set_pc_im(dc, dc->base.pc_next);
@@ -9850,7 +9852,7 @@ static void arm_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
gen_set_pc_im(dc, dc->base.pc_next);
gen_singlestep_exception(dc);
} else {
- gen_goto_tb(dc, 1, dc->base.pc_next);
+ gen_goto_tb(dc, 1, curr_insn_len(dc));
}
}
}
--
2.34.1
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH v6 3/9] target/arm: Change gen_*set_pc_im to gen_*update_pc
2022-10-06 3:38 [PATCH v6 0/9] target/arm: pc-relative translation blocks Richard Henderson
2022-10-06 3:38 ` [PATCH v6 1/9] target/arm: Introduce curr_insn_len Richard Henderson
2022-10-06 3:38 ` [PATCH v6 2/9] target/arm: Change gen_goto_tb to work on displacements Richard Henderson
@ 2022-10-06 3:38 ` Richard Henderson
2022-10-06 3:38 ` [PATCH v6 4/9] target/arm: Change gen_exception_insn* to work on displacements Richard Henderson
` (5 subsequent siblings)
8 siblings, 0 replies; 12+ messages in thread
From: Richard Henderson @ 2022-10-06 3:38 UTC (permalink / raw)
To: qemu-devel; +Cc: qemu-arm, Philippe Mathieu-Daudé
In preparation for TARGET_TB_PCREL, reduce reliance on
absolute values by passing in pc difference.
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/arm/translate-a32.h | 2 +-
target/arm/translate.h | 6 ++--
target/arm/translate-a64.c | 32 +++++++++---------
target/arm/translate-vfp.c | 2 +-
target/arm/translate.c | 68 ++++++++++++++++++++------------------
5 files changed, 56 insertions(+), 54 deletions(-)
diff --git a/target/arm/translate-a32.h b/target/arm/translate-a32.h
index 78a84c1414..5339c22f1e 100644
--- a/target/arm/translate-a32.h
+++ b/target/arm/translate-a32.h
@@ -40,7 +40,7 @@ void write_neon_element64(TCGv_i64 src, int reg, int ele, MemOp memop);
TCGv_i32 add_reg_for_lit(DisasContext *s, int reg, int ofs);
void gen_set_cpsr(TCGv_i32 var, uint32_t mask);
void gen_set_condexec(DisasContext *s);
-void gen_set_pc_im(DisasContext *s, target_ulong val);
+void gen_update_pc(DisasContext *s, target_long diff);
void gen_lookup_tb(DisasContext *s);
long vfp_reg_offset(bool dp, unsigned reg);
long neon_full_reg_offset(unsigned reg);
diff --git a/target/arm/translate.h b/target/arm/translate.h
index 90bf7c57fc..d651044855 100644
--- a/target/arm/translate.h
+++ b/target/arm/translate.h
@@ -254,7 +254,7 @@ static inline int curr_insn_len(DisasContext *s)
* For instructions which want an immediate exit to the main loop, as opposed
* to attempting to use lookup_and_goto_ptr. Unlike DISAS_UPDATE_EXIT, this
* doesn't write the PC on exiting the translation loop so you need to ensure
- * something (gen_a64_set_pc_im or runtime helper) has done so before we reach
+ * something (gen_a64_update_pc or runtime helper) has done so before we reach
* return from cpu_tb_exec.
*/
#define DISAS_EXIT DISAS_TARGET_9
@@ -263,14 +263,14 @@ static inline int curr_insn_len(DisasContext *s)
#ifdef TARGET_AARCH64
void a64_translate_init(void);
-void gen_a64_set_pc_im(uint64_t val);
+void gen_a64_update_pc(DisasContext *s, target_long diff);
extern const TranslatorOps aarch64_translator_ops;
#else
static inline void a64_translate_init(void)
{
}
-static inline void gen_a64_set_pc_im(uint64_t val)
+static inline void gen_a64_update_pc(DisasContext *s, target_long diff)
{
}
#endif
diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index 8f5c2675f7..914c789187 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -148,9 +148,9 @@ static void reset_btype(DisasContext *s)
}
}
-void gen_a64_set_pc_im(uint64_t val)
+void gen_a64_update_pc(DisasContext *s, target_long diff)
{
- tcg_gen_movi_i64(cpu_pc, val);
+ tcg_gen_movi_i64(cpu_pc, s->pc_curr + diff);
}
/*
@@ -342,14 +342,14 @@ static void gen_exception_internal(int excp)
static void gen_exception_internal_insn(DisasContext *s, uint64_t pc, int excp)
{
- gen_a64_set_pc_im(pc);
+ gen_a64_update_pc(s, pc - s->pc_curr);
gen_exception_internal(excp);
s->base.is_jmp = DISAS_NORETURN;
}
static void gen_exception_bkpt_insn(DisasContext *s, uint32_t syndrome)
{
- gen_a64_set_pc_im(s->pc_curr);
+ gen_a64_update_pc(s, 0);
gen_helper_exception_bkpt_insn(cpu_env, tcg_constant_i32(syndrome));
s->base.is_jmp = DISAS_NORETURN;
}
@@ -384,11 +384,11 @@ static void gen_goto_tb(DisasContext *s, int n, int64_t diff)
if (use_goto_tb(s, dest)) {
tcg_gen_goto_tb(n);
- gen_a64_set_pc_im(dest);
+ gen_a64_update_pc(s, diff);
tcg_gen_exit_tb(s->base.tb, n);
s->base.is_jmp = DISAS_NORETURN;
} else {
- gen_a64_set_pc_im(dest);
+ gen_a64_update_pc(s, diff);
if (s->ss_active) {
gen_step_complete_exception(s);
} else {
@@ -1960,7 +1960,7 @@ static void handle_sys(DisasContext *s, uint32_t insn, bool isread,
uint32_t syndrome;
syndrome = syn_aa64_sysregtrap(op0, op1, op2, crn, crm, rt, isread);
- gen_a64_set_pc_im(s->pc_curr);
+ gen_a64_update_pc(s, 0);
gen_helper_access_check_cp_reg(cpu_env,
tcg_constant_ptr(ri),
tcg_constant_i32(syndrome),
@@ -1970,7 +1970,7 @@ static void handle_sys(DisasContext *s, uint32_t insn, bool isread,
* The readfn or writefn might raise an exception;
* synchronize the CPU state in case it does.
*/
- gen_a64_set_pc_im(s->pc_curr);
+ gen_a64_update_pc(s, 0);
}
/* Handle special cases first */
@@ -2180,7 +2180,7 @@ static void disas_exc(DisasContext *s, uint32_t insn)
/* The pre HVC helper handles cases when HVC gets trapped
* as an undefined insn by runtime configuration.
*/
- gen_a64_set_pc_im(s->pc_curr);
+ gen_a64_update_pc(s, 0);
gen_helper_pre_hvc(cpu_env);
gen_ss_advance(s);
gen_exception_insn_el(s, s->base.pc_next, EXCP_HVC,
@@ -2191,7 +2191,7 @@ static void disas_exc(DisasContext *s, uint32_t insn)
unallocated_encoding(s);
break;
}
- gen_a64_set_pc_im(s->pc_curr);
+ gen_a64_update_pc(s, 0);
gen_helper_pre_smc(cpu_env, tcg_constant_i32(syn_aa64_smc(imm16)));
gen_ss_advance(s);
gen_exception_insn_el(s, s->base.pc_next, EXCP_SMC,
@@ -14944,7 +14944,7 @@ static void aarch64_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
*/
switch (dc->base.is_jmp) {
default:
- gen_a64_set_pc_im(dc->base.pc_next);
+ gen_a64_update_pc(dc, 4);
/* fall through */
case DISAS_EXIT:
case DISAS_JUMP:
@@ -14961,13 +14961,13 @@ static void aarch64_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
break;
default:
case DISAS_UPDATE_EXIT:
- gen_a64_set_pc_im(dc->base.pc_next);
+ gen_a64_update_pc(dc, 4);
/* fall through */
case DISAS_EXIT:
tcg_gen_exit_tb(NULL, 0);
break;
case DISAS_UPDATE_NOCHAIN:
- gen_a64_set_pc_im(dc->base.pc_next);
+ gen_a64_update_pc(dc, 4);
/* fall through */
case DISAS_JUMP:
tcg_gen_lookup_and_goto_ptr();
@@ -14976,11 +14976,11 @@ static void aarch64_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
case DISAS_SWI:
break;
case DISAS_WFE:
- gen_a64_set_pc_im(dc->base.pc_next);
+ gen_a64_update_pc(dc, 4);
gen_helper_wfe(cpu_env);
break;
case DISAS_YIELD:
- gen_a64_set_pc_im(dc->base.pc_next);
+ gen_a64_update_pc(dc, 4);
gen_helper_yield(cpu_env);
break;
case DISAS_WFI:
@@ -14988,7 +14988,7 @@ static void aarch64_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
* This is a special case because we don't want to just halt
* the CPU if trying to debug across a WFI.
*/
- gen_a64_set_pc_im(dc->base.pc_next);
+ gen_a64_update_pc(dc, 4);
gen_helper_wfi(cpu_env, tcg_constant_i32(4));
/*
* The helper doesn't necessarily throw an exception, but we
diff --git a/target/arm/translate-vfp.c b/target/arm/translate-vfp.c
index 94cc1e4b77..070f465b17 100644
--- a/target/arm/translate-vfp.c
+++ b/target/arm/translate-vfp.c
@@ -856,7 +856,7 @@ static bool trans_VMSR_VMRS(DisasContext *s, arg_VMSR_VMRS *a)
case ARM_VFP_FPSID:
if (s->current_el == 1) {
gen_set_condexec(s);
- gen_set_pc_im(s, s->pc_curr);
+ gen_update_pc(s, 0);
gen_helper_check_hcr_el2_trap(cpu_env,
tcg_constant_i32(a->rt),
tcg_constant_i32(a->reg));
diff --git a/target/arm/translate.c b/target/arm/translate.c
index 6855128fb1..01b7536c7e 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -772,9 +772,9 @@ void gen_set_condexec(DisasContext *s)
}
}
-void gen_set_pc_im(DisasContext *s, target_ulong val)
+void gen_update_pc(DisasContext *s, target_long diff)
{
- tcg_gen_movi_i32(cpu_R[15], val);
+ tcg_gen_movi_i32(cpu_R[15], s->pc_curr + diff);
}
/* Set PC and Thumb state from var. var is marked as dead. */
@@ -866,7 +866,7 @@ static inline void gen_bxns(DisasContext *s, int rm)
/* The bxns helper may raise an EXCEPTION_EXIT exception, so in theory
* we need to sync state before calling it, but:
- * - we don't need to do gen_set_pc_im() because the bxns helper will
+ * - we don't need to do gen_update_pc() because the bxns helper will
* always set the PC itself
* - we don't need to do gen_set_condexec() because BXNS is UNPREDICTABLE
* unless it's outside an IT block or the last insn in an IT block,
@@ -887,7 +887,7 @@ static inline void gen_blxns(DisasContext *s, int rm)
* We do however need to set the PC, because the blxns helper reads it.
* The blxns helper may throw an exception.
*/
- gen_set_pc_im(s, s->base.pc_next);
+ gen_update_pc(s, curr_insn_len(s));
gen_helper_v7m_blxns(cpu_env, var);
tcg_temp_free_i32(var);
s->base.is_jmp = DISAS_EXIT;
@@ -1055,7 +1055,7 @@ static inline void gen_hvc(DisasContext *s, int imm16)
* as an undefined insn by runtime configuration (ie before
* the insn really executes).
*/
- gen_set_pc_im(s, s->pc_curr);
+ gen_update_pc(s, 0);
gen_helper_pre_hvc(cpu_env);
/* Otherwise we will treat this as a real exception which
* happens after execution of the insn. (The distinction matters
@@ -1063,7 +1063,7 @@ static inline void gen_hvc(DisasContext *s, int imm16)
* for single stepping.)
*/
s->svc_imm = imm16;
- gen_set_pc_im(s, s->base.pc_next);
+ gen_update_pc(s, curr_insn_len(s));
s->base.is_jmp = DISAS_HVC;
}
@@ -1072,16 +1072,16 @@ static inline void gen_smc(DisasContext *s)
/* As with HVC, we may take an exception either before or after
* the insn executes.
*/
- gen_set_pc_im(s, s->pc_curr);
+ gen_update_pc(s, 0);
gen_helper_pre_smc(cpu_env, tcg_constant_i32(syn_aa32_smc()));
- gen_set_pc_im(s, s->base.pc_next);
+ gen_update_pc(s, curr_insn_len(s));
s->base.is_jmp = DISAS_SMC;
}
static void gen_exception_internal_insn(DisasContext *s, uint32_t pc, int excp)
{
gen_set_condexec(s);
- gen_set_pc_im(s, pc);
+ gen_update_pc(s, pc - s->pc_curr);
gen_exception_internal(excp);
s->base.is_jmp = DISAS_NORETURN;
}
@@ -1107,10 +1107,10 @@ static void gen_exception_insn_el_v(DisasContext *s, uint64_t pc, int excp,
uint32_t syn, TCGv_i32 tcg_el)
{
if (s->aarch64) {
- gen_a64_set_pc_im(pc);
+ gen_a64_update_pc(s, pc - s->pc_curr);
} else {
gen_set_condexec(s);
- gen_set_pc_im(s, pc);
+ gen_update_pc(s, pc - s->pc_curr);
}
gen_exception_el_v(excp, syn, tcg_el);
s->base.is_jmp = DISAS_NORETURN;
@@ -1125,10 +1125,10 @@ void gen_exception_insn_el(DisasContext *s, uint64_t pc, int excp,
void gen_exception_insn(DisasContext *s, uint64_t pc, int excp, uint32_t syn)
{
if (s->aarch64) {
- gen_a64_set_pc_im(pc);
+ gen_a64_update_pc(s, pc - s->pc_curr);
} else {
gen_set_condexec(s);
- gen_set_pc_im(s, pc);
+ gen_update_pc(s, pc - s->pc_curr);
}
gen_exception(excp, syn);
s->base.is_jmp = DISAS_NORETURN;
@@ -1137,7 +1137,7 @@ void gen_exception_insn(DisasContext *s, uint64_t pc, int excp, uint32_t syn)
static void gen_exception_bkpt_insn(DisasContext *s, uint32_t syn)
{
gen_set_condexec(s);
- gen_set_pc_im(s, s->pc_curr);
+ gen_update_pc(s, 0);
gen_helper_exception_bkpt_insn(cpu_env, tcg_constant_i32(syn));
s->base.is_jmp = DISAS_NORETURN;
}
@@ -2600,10 +2600,10 @@ static void gen_goto_tb(DisasContext *s, int n, int diff)
if (translator_use_goto_tb(&s->base, dest)) {
tcg_gen_goto_tb(n);
- gen_set_pc_im(s, dest);
+ gen_update_pc(s, diff);
tcg_gen_exit_tb(s->base.tb, n);
} else {
- gen_set_pc_im(s, dest);
+ gen_update_pc(s, diff);
gen_goto_ptr();
}
s->base.is_jmp = DISAS_NORETURN;
@@ -2612,9 +2612,11 @@ static void gen_goto_tb(DisasContext *s, int n, int diff)
/* Jump, specifying which TB number to use if we gen_goto_tb() */
static inline void gen_jmp_tb(DisasContext *s, uint32_t dest, int tbno)
{
+ int diff = dest - s->pc_curr;
+
if (unlikely(s->ss_active)) {
/* An indirect jump so that we still trigger the debug exception. */
- gen_set_pc_im(s, dest);
+ gen_update_pc(s, diff);
s->base.is_jmp = DISAS_JUMP;
return;
}
@@ -2631,7 +2633,7 @@ static inline void gen_jmp_tb(DisasContext *s, uint32_t dest, int tbno)
* gen_jmp();
* on the second call to gen_jmp().
*/
- gen_goto_tb(s, tbno, dest - s->pc_curr);
+ gen_goto_tb(s, tbno, diff);
break;
case DISAS_UPDATE_NOCHAIN:
case DISAS_UPDATE_EXIT:
@@ -2640,7 +2642,7 @@ static inline void gen_jmp_tb(DisasContext *s, uint32_t dest, int tbno)
* Avoid using goto_tb so we really do exit back to the main loop
* and don't chain to another TB.
*/
- gen_set_pc_im(s, dest);
+ gen_update_pc(s, diff);
gen_goto_ptr();
s->base.is_jmp = DISAS_NORETURN;
break;
@@ -2908,7 +2910,7 @@ static void gen_msr_banked(DisasContext *s, int r, int sysm, int rn)
/* Sync state because msr_banked() can raise exceptions */
gen_set_condexec(s);
- gen_set_pc_im(s, s->pc_curr);
+ gen_update_pc(s, 0);
tcg_reg = load_reg(s, rn);
gen_helper_msr_banked(cpu_env, tcg_reg,
tcg_constant_i32(tgtmode),
@@ -2928,7 +2930,7 @@ static void gen_mrs_banked(DisasContext *s, int r, int sysm, int rn)
/* Sync state because mrs_banked() can raise exceptions */
gen_set_condexec(s);
- gen_set_pc_im(s, s->pc_curr);
+ gen_update_pc(s, 0);
tcg_reg = tcg_temp_new_i32();
gen_helper_mrs_banked(tcg_reg, cpu_env,
tcg_constant_i32(tgtmode),
@@ -4749,7 +4751,7 @@ static void do_coproc_insn(DisasContext *s, int cpnum, int is64,
}
gen_set_condexec(s);
- gen_set_pc_im(s, s->pc_curr);
+ gen_update_pc(s, 0);
gen_helper_access_check_cp_reg(cpu_env,
tcg_constant_ptr(ri),
tcg_constant_i32(syndrome),
@@ -4760,7 +4762,7 @@ static void do_coproc_insn(DisasContext *s, int cpnum, int is64,
* synchronize the CPU state in case it does.
*/
gen_set_condexec(s);
- gen_set_pc_im(s, s->pc_curr);
+ gen_update_pc(s, 0);
}
/* Handle special cases first */
@@ -4774,7 +4776,7 @@ static void do_coproc_insn(DisasContext *s, int cpnum, int is64,
unallocated_encoding(s);
return;
}
- gen_set_pc_im(s, s->base.pc_next);
+ gen_update_pc(s, curr_insn_len(s));
s->base.is_jmp = DISAS_WFI;
return;
default:
@@ -5161,7 +5163,7 @@ static void gen_srs(DisasContext *s,
addr = tcg_temp_new_i32();
/* get_r13_banked() will raise an exception if called from System mode */
gen_set_condexec(s);
- gen_set_pc_im(s, s->pc_curr);
+ gen_update_pc(s, 0);
gen_helper_get_r13_banked(addr, cpu_env, tcg_constant_i32(mode));
switch (amode) {
case 0: /* DA */
@@ -6230,7 +6232,7 @@ static bool trans_YIELD(DisasContext *s, arg_YIELD *a)
* scheduling of other vCPUs.
*/
if (!(tb_cflags(s->base.tb) & CF_PARALLEL)) {
- gen_set_pc_im(s, s->base.pc_next);
+ gen_update_pc(s, curr_insn_len(s));
s->base.is_jmp = DISAS_YIELD;
}
return true;
@@ -6246,7 +6248,7 @@ static bool trans_WFE(DisasContext *s, arg_WFE *a)
* implemented so we can't sleep like WFI does.
*/
if (!(tb_cflags(s->base.tb) & CF_PARALLEL)) {
- gen_set_pc_im(s, s->base.pc_next);
+ gen_update_pc(s, curr_insn_len(s));
s->base.is_jmp = DISAS_WFE;
}
return true;
@@ -6255,7 +6257,7 @@ static bool trans_WFE(DisasContext *s, arg_WFE *a)
static bool trans_WFI(DisasContext *s, arg_WFI *a)
{
/* For WFI, halt the vCPU until an IRQ. */
- gen_set_pc_im(s, s->base.pc_next);
+ gen_update_pc(s, curr_insn_len(s));
s->base.is_jmp = DISAS_WFI;
return true;
}
@@ -8765,7 +8767,7 @@ static bool trans_SVC(DisasContext *s, arg_SVC *a)
(a->imm == semihost_imm)) {
gen_exception_internal_insn(s, s->pc_curr, EXCP_SEMIHOST);
} else {
- gen_set_pc_im(s, s->base.pc_next);
+ gen_update_pc(s, curr_insn_len(s));
s->svc_imm = a->imm;
s->base.is_jmp = DISAS_SWI;
}
@@ -9779,7 +9781,7 @@ static void arm_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
case DISAS_TOO_MANY:
case DISAS_UPDATE_EXIT:
case DISAS_UPDATE_NOCHAIN:
- gen_set_pc_im(dc, dc->base.pc_next);
+ gen_update_pc(dc, curr_insn_len(dc));
/* fall through */
default:
/* FIXME: Single stepping a WFI insn will not halt the CPU. */
@@ -9803,13 +9805,13 @@ static void arm_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
gen_goto_tb(dc, 1, curr_insn_len(dc));
break;
case DISAS_UPDATE_NOCHAIN:
- gen_set_pc_im(dc, dc->base.pc_next);
+ gen_update_pc(dc, curr_insn_len(dc));
/* fall through */
case DISAS_JUMP:
gen_goto_ptr();
break;
case DISAS_UPDATE_EXIT:
- gen_set_pc_im(dc, dc->base.pc_next);
+ gen_update_pc(dc, curr_insn_len(dc));
/* fall through */
default:
/* indicate that the hash table must be used to find the next TB */
@@ -9849,7 +9851,7 @@ static void arm_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
gen_set_label(dc->condlabel);
gen_set_condexec(dc);
if (unlikely(dc->ss_active)) {
- gen_set_pc_im(dc, dc->base.pc_next);
+ gen_update_pc(dc, curr_insn_len(dc));
gen_singlestep_exception(dc);
} else {
gen_goto_tb(dc, 1, curr_insn_len(dc));
--
2.34.1
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH v6 4/9] target/arm: Change gen_exception_insn* to work on displacements
2022-10-06 3:38 [PATCH v6 0/9] target/arm: pc-relative translation blocks Richard Henderson
` (2 preceding siblings ...)
2022-10-06 3:38 ` [PATCH v6 3/9] target/arm: Change gen_*set_pc_im to gen_*update_pc Richard Henderson
@ 2022-10-06 3:38 ` Richard Henderson
2022-10-06 3:38 ` [PATCH v6 5/9] target/arm: Remove gen_exception_internal_insn pc argument Richard Henderson
` (4 subsequent siblings)
8 siblings, 0 replies; 12+ messages in thread
From: Richard Henderson @ 2022-10-06 3:38 UTC (permalink / raw)
To: qemu-devel; +Cc: qemu-arm, Philippe Mathieu-Daudé
In preparation for TARGET_TB_PCREL, reduce reliance on absolute values.
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/arm/translate.h | 5 +++--
target/arm/translate-a64.c | 28 ++++++++++-------------
target/arm/translate-m-nocp.c | 6 ++---
target/arm/translate-mve.c | 2 +-
target/arm/translate-vfp.c | 6 ++---
target/arm/translate.c | 42 +++++++++++++++++------------------
6 files changed, 43 insertions(+), 46 deletions(-)
diff --git a/target/arm/translate.h b/target/arm/translate.h
index d651044855..4aa239e23c 100644
--- a/target/arm/translate.h
+++ b/target/arm/translate.h
@@ -281,9 +281,10 @@ void arm_jump_cc(DisasCompare *cmp, TCGLabel *label);
void arm_gen_test_cc(int cc, TCGLabel *label);
MemOp pow2_align(unsigned i);
void unallocated_encoding(DisasContext *s);
-void gen_exception_insn_el(DisasContext *s, uint64_t pc, int excp,
+void gen_exception_insn_el(DisasContext *s, target_long pc_diff, int excp,
uint32_t syn, uint32_t target_el);
-void gen_exception_insn(DisasContext *s, uint64_t pc, int excp, uint32_t syn);
+void gen_exception_insn(DisasContext *s, target_long pc_diff,
+ int excp, uint32_t syn);
/* Return state of Alternate Half-precision flag, caller frees result */
static inline TCGv_i32 get_ahp_flag(void)
diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index 914c789187..2621b3b36a 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -1163,7 +1163,7 @@ static bool fp_access_check_only(DisasContext *s)
assert(!s->fp_access_checked);
s->fp_access_checked = true;
- gen_exception_insn_el(s, s->pc_curr, EXCP_UDEF,
+ gen_exception_insn_el(s, 0, EXCP_UDEF,
syn_fp_access_trap(1, 0xe, false, 0),
s->fp_excp_el);
return false;
@@ -1178,7 +1178,7 @@ static bool fp_access_check(DisasContext *s)
return false;
}
if (s->sme_trap_nonstreaming && s->is_nonstreaming) {
- gen_exception_insn(s, s->pc_curr, EXCP_UDEF,
+ gen_exception_insn(s, 0, EXCP_UDEF,
syn_smetrap(SME_ET_Streaming, false));
return false;
}
@@ -1198,7 +1198,7 @@ bool sve_access_check(DisasContext *s)
goto fail_exit;
}
} else if (s->sve_excp_el) {
- gen_exception_insn_el(s, s->pc_curr, EXCP_UDEF,
+ gen_exception_insn_el(s, 0, EXCP_UDEF,
syn_sve_access_trap(), s->sve_excp_el);
goto fail_exit;
}
@@ -1220,7 +1220,7 @@ bool sve_access_check(DisasContext *s)
static bool sme_access_check(DisasContext *s)
{
if (s->sme_excp_el) {
- gen_exception_insn_el(s, s->pc_curr, EXCP_UDEF,
+ gen_exception_insn_el(s, 0, EXCP_UDEF,
syn_smetrap(SME_ET_AccessTrap, false),
s->sme_excp_el);
return false;
@@ -1250,12 +1250,12 @@ bool sme_enabled_check_with_svcr(DisasContext *s, unsigned req)
return false;
}
if (FIELD_EX64(req, SVCR, SM) && !s->pstate_sm) {
- gen_exception_insn(s, s->pc_curr, EXCP_UDEF,
+ gen_exception_insn(s, 0, EXCP_UDEF,
syn_smetrap(SME_ET_NotStreaming, false));
return false;
}
if (FIELD_EX64(req, SVCR, ZA) && !s->pstate_za) {
- gen_exception_insn(s, s->pc_curr, EXCP_UDEF,
+ gen_exception_insn(s, 0, EXCP_UDEF,
syn_smetrap(SME_ET_InactiveZA, false));
return false;
}
@@ -1915,7 +1915,7 @@ static void gen_sysreg_undef(DisasContext *s, bool isread,
} else {
syndrome = syn_uncategorized();
}
- gen_exception_insn(s, s->pc_curr, EXCP_UDEF, syndrome);
+ gen_exception_insn(s, 0, EXCP_UDEF, syndrome);
}
/* MRS - move from system register
@@ -2169,8 +2169,7 @@ static void disas_exc(DisasContext *s, uint32_t insn)
switch (op2_ll) {
case 1: /* SVC */
gen_ss_advance(s);
- gen_exception_insn(s, s->base.pc_next, EXCP_SWI,
- syn_aa64_svc(imm16));
+ gen_exception_insn(s, 4, EXCP_SWI, syn_aa64_svc(imm16));
break;
case 2: /* HVC */
if (s->current_el == 0) {
@@ -2183,8 +2182,7 @@ static void disas_exc(DisasContext *s, uint32_t insn)
gen_a64_update_pc(s, 0);
gen_helper_pre_hvc(cpu_env);
gen_ss_advance(s);
- gen_exception_insn_el(s, s->base.pc_next, EXCP_HVC,
- syn_aa64_hvc(imm16), 2);
+ gen_exception_insn_el(s, 4, EXCP_HVC, syn_aa64_hvc(imm16), 2);
break;
case 3: /* SMC */
if (s->current_el == 0) {
@@ -2194,8 +2192,7 @@ static void disas_exc(DisasContext *s, uint32_t insn)
gen_a64_update_pc(s, 0);
gen_helper_pre_smc(cpu_env, tcg_constant_i32(syn_aa64_smc(imm16)));
gen_ss_advance(s);
- gen_exception_insn_el(s, s->base.pc_next, EXCP_SMC,
- syn_aa64_smc(imm16), 3);
+ gen_exception_insn_el(s, 4, EXCP_SMC, syn_aa64_smc(imm16), 3);
break;
default:
unallocated_encoding(s);
@@ -14833,7 +14830,7 @@ static void aarch64_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
* Illegal execution state. This has priority over BTI
* exceptions, but comes after instruction abort exceptions.
*/
- gen_exception_insn(s, s->pc_curr, EXCP_UDEF, syn_illegalstate());
+ gen_exception_insn(s, 0, EXCP_UDEF, syn_illegalstate());
return;
}
@@ -14864,8 +14861,7 @@ static void aarch64_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
if (s->btype != 0
&& s->guarded_page
&& !btype_destination_ok(insn, s->bt, s->btype)) {
- gen_exception_insn(s, s->pc_curr, EXCP_UDEF,
- syn_btitrap(s->btype));
+ gen_exception_insn(s, 0, EXCP_UDEF, syn_btitrap(s->btype));
return;
}
} else {
diff --git a/target/arm/translate-m-nocp.c b/target/arm/translate-m-nocp.c
index 4029d7fdd4..694fae7e2e 100644
--- a/target/arm/translate-m-nocp.c
+++ b/target/arm/translate-m-nocp.c
@@ -143,7 +143,7 @@ static bool trans_VSCCLRM(DisasContext *s, arg_VSCCLRM *a)
tcg_gen_brcondi_i32(TCG_COND_EQ, sfpa, 0, s->condlabel);
if (s->fp_excp_el != 0) {
- gen_exception_insn_el(s, s->pc_curr, EXCP_NOCP,
+ gen_exception_insn_el(s, 0, EXCP_NOCP,
syn_uncategorized(), s->fp_excp_el);
return true;
}
@@ -765,12 +765,12 @@ static bool trans_NOCP(DisasContext *s, arg_nocp *a)
}
if (a->cp != 10) {
- gen_exception_insn(s, s->pc_curr, EXCP_NOCP, syn_uncategorized());
+ gen_exception_insn(s, 0, EXCP_NOCP, syn_uncategorized());
return true;
}
if (s->fp_excp_el != 0) {
- gen_exception_insn_el(s, s->pc_curr, EXCP_NOCP,
+ gen_exception_insn_el(s, 0, EXCP_NOCP,
syn_uncategorized(), s->fp_excp_el);
return true;
}
diff --git a/target/arm/translate-mve.c b/target/arm/translate-mve.c
index 0cf1b5ea4f..db7ea3f603 100644
--- a/target/arm/translate-mve.c
+++ b/target/arm/translate-mve.c
@@ -100,7 +100,7 @@ bool mve_eci_check(DisasContext *s)
return true;
default:
/* Reserved value: INVSTATE UsageFault */
- gen_exception_insn(s, s->pc_curr, EXCP_INVSTATE, syn_uncategorized());
+ gen_exception_insn(s, 0, EXCP_INVSTATE, syn_uncategorized());
return false;
}
}
diff --git a/target/arm/translate-vfp.c b/target/arm/translate-vfp.c
index 070f465b17..5c5d58d2c6 100644
--- a/target/arm/translate-vfp.c
+++ b/target/arm/translate-vfp.c
@@ -230,7 +230,7 @@ static bool vfp_access_check_a(DisasContext *s, bool ignore_vfp_enabled)
int coproc = arm_dc_feature(s, ARM_FEATURE_V8) ? 0 : 0xa;
uint32_t syn = syn_fp_access_trap(1, 0xe, false, coproc);
- gen_exception_insn_el(s, s->pc_curr, EXCP_UDEF, syn, s->fp_excp_el);
+ gen_exception_insn_el(s, 0, EXCP_UDEF, syn, s->fp_excp_el);
return false;
}
@@ -240,7 +240,7 @@ static bool vfp_access_check_a(DisasContext *s, bool ignore_vfp_enabled)
* appear to be any insns which touch VFP which are allowed.
*/
if (s->sme_trap_nonstreaming) {
- gen_exception_insn(s, s->pc_curr, EXCP_UDEF,
+ gen_exception_insn(s, 0, EXCP_UDEF,
syn_smetrap(SME_ET_Streaming,
curr_insn_len(s) == 2));
return false;
@@ -272,7 +272,7 @@ bool vfp_access_check_m(DisasContext *s, bool skip_context_update)
* the encoding space handled by the patterns in m-nocp.decode,
* and for them we may need to raise NOCP here.
*/
- gen_exception_insn_el(s, s->pc_curr, EXCP_NOCP,
+ gen_exception_insn_el(s, 0, EXCP_NOCP,
syn_uncategorized(), s->fp_excp_el);
return false;
}
diff --git a/target/arm/translate.c b/target/arm/translate.c
index 01b7536c7e..f9d3128656 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -1103,32 +1103,34 @@ static void gen_exception(int excp, uint32_t syndrome)
tcg_constant_i32(syndrome));
}
-static void gen_exception_insn_el_v(DisasContext *s, uint64_t pc, int excp,
- uint32_t syn, TCGv_i32 tcg_el)
+static void gen_exception_insn_el_v(DisasContext *s, target_long pc_diff,
+ int excp, uint32_t syn, TCGv_i32 tcg_el)
{
if (s->aarch64) {
- gen_a64_update_pc(s, pc - s->pc_curr);
+ gen_a64_update_pc(s, pc_diff);
} else {
gen_set_condexec(s);
- gen_update_pc(s, pc - s->pc_curr);
+ gen_update_pc(s, pc_diff);
}
gen_exception_el_v(excp, syn, tcg_el);
s->base.is_jmp = DISAS_NORETURN;
}
-void gen_exception_insn_el(DisasContext *s, uint64_t pc, int excp,
+void gen_exception_insn_el(DisasContext *s, target_long pc_diff, int excp,
uint32_t syn, uint32_t target_el)
{
- gen_exception_insn_el_v(s, pc, excp, syn, tcg_constant_i32(target_el));
+ gen_exception_insn_el_v(s, pc_diff, excp, syn,
+ tcg_constant_i32(target_el));
}
-void gen_exception_insn(DisasContext *s, uint64_t pc, int excp, uint32_t syn)
+void gen_exception_insn(DisasContext *s, target_long pc_diff,
+ int excp, uint32_t syn)
{
if (s->aarch64) {
- gen_a64_update_pc(s, pc - s->pc_curr);
+ gen_a64_update_pc(s, pc_diff);
} else {
gen_set_condexec(s);
- gen_update_pc(s, pc - s->pc_curr);
+ gen_update_pc(s, pc_diff);
}
gen_exception(excp, syn);
s->base.is_jmp = DISAS_NORETURN;
@@ -1145,7 +1147,7 @@ static void gen_exception_bkpt_insn(DisasContext *s, uint32_t syn)
void unallocated_encoding(DisasContext *s)
{
/* Unallocated and reserved encodings are uncategorized */
- gen_exception_insn(s, s->pc_curr, EXCP_UDEF, syn_uncategorized());
+ gen_exception_insn(s, 0, EXCP_UDEF, syn_uncategorized());
}
/* Force a TB lookup after an instruction that changes the CPU state. */
@@ -2869,7 +2871,7 @@ static bool msr_banked_access_decode(DisasContext *s, int r, int sysm, int rn,
tcg_el = tcg_constant_i32(3);
}
- gen_exception_insn_el_v(s, s->pc_curr, EXCP_UDEF,
+ gen_exception_insn_el_v(s, 0, EXCP_UDEF,
syn_uncategorized(), tcg_el);
tcg_temp_free_i32(tcg_el);
return false;
@@ -2895,7 +2897,7 @@ static bool msr_banked_access_decode(DisasContext *s, int r, int sysm, int rn,
undef:
/* If we get here then some access check did not pass */
- gen_exception_insn(s, s->pc_curr, EXCP_UDEF, syn_uncategorized());
+ gen_exception_insn(s, 0, EXCP_UDEF, syn_uncategorized());
return false;
}
@@ -5119,8 +5121,7 @@ static void gen_srs(DisasContext *s,
* For the UNPREDICTABLE cases we choose to UNDEF.
*/
if (s->current_el == 1 && !s->ns && mode == ARM_CPU_MODE_MON) {
- gen_exception_insn_el(s, s->pc_curr, EXCP_UDEF,
- syn_uncategorized(), 3);
+ gen_exception_insn_el(s, 0, EXCP_UDEF, syn_uncategorized(), 3);
return;
}
@@ -8502,7 +8503,7 @@ static bool trans_WLS(DisasContext *s, arg_WLS *a)
* Do the check-and-raise-exception by hand.
*/
if (s->fp_excp_el) {
- gen_exception_insn_el(s, s->pc_curr, EXCP_NOCP,
+ gen_exception_insn_el(s, 0, EXCP_NOCP,
syn_uncategorized(), s->fp_excp_el);
return true;
}
@@ -8605,7 +8606,7 @@ static bool trans_LE(DisasContext *s, arg_LE *a)
tmp = load_cpu_field(v7m.ltpsize);
tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 4, skipexc);
tcg_temp_free_i32(tmp);
- gen_exception_insn(s, s->pc_curr, EXCP_INVSTATE, syn_uncategorized());
+ gen_exception_insn(s, 0, EXCP_INVSTATE, syn_uncategorized());
gen_set_label(skipexc);
}
@@ -9073,7 +9074,7 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
* UsageFault exception.
*/
if (arm_dc_feature(s, ARM_FEATURE_M)) {
- gen_exception_insn(s, s->pc_curr, EXCP_INVSTATE, syn_uncategorized());
+ gen_exception_insn(s, 0, EXCP_INVSTATE, syn_uncategorized());
return;
}
@@ -9082,7 +9083,7 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
* Illegal execution state. This has priority over BTI
* exceptions, but comes after instruction abort exceptions.
*/
- gen_exception_insn(s, s->pc_curr, EXCP_UDEF, syn_illegalstate());
+ gen_exception_insn(s, 0, EXCP_UDEF, syn_illegalstate());
return;
}
@@ -9647,7 +9648,7 @@ static void thumb_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
* Illegal execution state. This has priority over BTI
* exceptions, but comes after instruction abort exceptions.
*/
- gen_exception_insn(dc, dc->pc_curr, EXCP_UDEF, syn_illegalstate());
+ gen_exception_insn(dc, 0, EXCP_UDEF, syn_illegalstate());
return;
}
@@ -9720,8 +9721,7 @@ static void thumb_tr_translate_insn(DisasContextBase *dcbase, CPUState *cpu)
*/
tcg_remove_ops_after(dc->insn_eci_rewind);
dc->condjmp = 0;
- gen_exception_insn(dc, dc->pc_curr, EXCP_INVSTATE,
- syn_uncategorized());
+ gen_exception_insn(dc, 0, EXCP_INVSTATE, syn_uncategorized());
}
arm_post_translate_insn(dc);
--
2.34.1
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH v6 5/9] target/arm: Remove gen_exception_internal_insn pc argument
2022-10-06 3:38 [PATCH v6 0/9] target/arm: pc-relative translation blocks Richard Henderson
` (3 preceding siblings ...)
2022-10-06 3:38 ` [PATCH v6 4/9] target/arm: Change gen_exception_insn* to work on displacements Richard Henderson
@ 2022-10-06 3:38 ` Richard Henderson
2022-10-06 3:38 ` [PATCH v6 6/9] target/arm: Change gen_jmp* to work on displacements Richard Henderson
` (3 subsequent siblings)
8 siblings, 0 replies; 12+ messages in thread
From: Richard Henderson @ 2022-10-06 3:38 UTC (permalink / raw)
To: qemu-devel; +Cc: qemu-arm, Philippe Mathieu-Daudé
In preparation for TARGET_TB_PCREL, reduce reliance on absolute values.
Since we always pass dc->pc_curr, fold the arithmetic to zero displacement.
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/arm/translate-a64.c | 6 +++---
target/arm/translate.c | 10 +++++-----
2 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index 2621b3b36a..005fd767fb 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -340,9 +340,9 @@ static void gen_exception_internal(int excp)
gen_helper_exception_internal(cpu_env, tcg_constant_i32(excp));
}
-static void gen_exception_internal_insn(DisasContext *s, uint64_t pc, int excp)
+static void gen_exception_internal_insn(DisasContext *s, int excp)
{
- gen_a64_update_pc(s, pc - s->pc_curr);
+ gen_a64_update_pc(s, 0);
gen_exception_internal(excp);
s->base.is_jmp = DISAS_NORETURN;
}
@@ -2219,7 +2219,7 @@ static void disas_exc(DisasContext *s, uint32_t insn)
* Secondly, "HLT 0xf000" is the A64 semihosting syscall instruction.
*/
if (semihosting_enabled(s->current_el == 0) && imm16 == 0xf000) {
- gen_exception_internal_insn(s, s->pc_curr, EXCP_SEMIHOST);
+ gen_exception_internal_insn(s, EXCP_SEMIHOST);
} else {
unallocated_encoding(s);
}
diff --git a/target/arm/translate.c b/target/arm/translate.c
index f9d3128656..e0b1d415a2 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -1078,10 +1078,10 @@ static inline void gen_smc(DisasContext *s)
s->base.is_jmp = DISAS_SMC;
}
-static void gen_exception_internal_insn(DisasContext *s, uint32_t pc, int excp)
+static void gen_exception_internal_insn(DisasContext *s, int excp)
{
gen_set_condexec(s);
- gen_update_pc(s, pc - s->pc_curr);
+ gen_update_pc(s, 0);
gen_exception_internal(excp);
s->base.is_jmp = DISAS_NORETURN;
}
@@ -1173,7 +1173,7 @@ static inline void gen_hlt(DisasContext *s, int imm)
*/
if (semihosting_enabled(s->current_el != 0) &&
(imm == (s->thumb ? 0x3c : 0xf000))) {
- gen_exception_internal_insn(s, s->pc_curr, EXCP_SEMIHOST);
+ gen_exception_internal_insn(s, EXCP_SEMIHOST);
return;
}
@@ -6560,7 +6560,7 @@ static bool trans_BKPT(DisasContext *s, arg_BKPT *a)
if (arm_dc_feature(s, ARM_FEATURE_M) &&
semihosting_enabled(s->current_el == 0) &&
(a->imm == 0xab)) {
- gen_exception_internal_insn(s, s->pc_curr, EXCP_SEMIHOST);
+ gen_exception_internal_insn(s, EXCP_SEMIHOST);
} else {
gen_exception_bkpt_insn(s, syn_aa32_bkpt(a->imm, false));
}
@@ -8766,7 +8766,7 @@ static bool trans_SVC(DisasContext *s, arg_SVC *a)
if (!arm_dc_feature(s, ARM_FEATURE_M) &&
semihosting_enabled(s->current_el == 0) &&
(a->imm == semihost_imm)) {
- gen_exception_internal_insn(s, s->pc_curr, EXCP_SEMIHOST);
+ gen_exception_internal_insn(s, EXCP_SEMIHOST);
} else {
gen_update_pc(s, curr_insn_len(s));
s->svc_imm = a->imm;
--
2.34.1
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH v6 6/9] target/arm: Change gen_jmp* to work on displacements
2022-10-06 3:38 [PATCH v6 0/9] target/arm: pc-relative translation blocks Richard Henderson
` (4 preceding siblings ...)
2022-10-06 3:38 ` [PATCH v6 5/9] target/arm: Remove gen_exception_internal_insn pc argument Richard Henderson
@ 2022-10-06 3:38 ` Richard Henderson
2022-10-06 3:38 ` [PATCH v6 7/9] target/arm: Introduce gen_pc_plus_diff for aarch64 Richard Henderson
` (2 subsequent siblings)
8 siblings, 0 replies; 12+ messages in thread
From: Richard Henderson @ 2022-10-06 3:38 UTC (permalink / raw)
To: qemu-devel; +Cc: qemu-arm, Peter Maydell
In preparation for TARGET_TB_PCREL, reduce reliance on absolute values.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/arm/translate.c | 37 +++++++++++++++++++++----------------
1 file changed, 21 insertions(+), 16 deletions(-)
diff --git a/target/arm/translate.c b/target/arm/translate.c
index e0b1d415a2..336f151c4a 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -270,6 +270,12 @@ static uint32_t read_pc(DisasContext *s)
return s->pc_curr + (s->thumb ? 4 : 8);
}
+/* The pc_curr difference for an architectural jump. */
+static target_long jmp_diff(DisasContext *s, target_long diff)
+{
+ return diff + (s->thumb ? 4 : 8);
+}
+
/* Set a variable to the value of a CPU register. */
void load_reg_var(DisasContext *s, TCGv_i32 var, int reg)
{
@@ -2596,7 +2602,7 @@ static void gen_goto_ptr(void)
* cpu_loop_exec. Any live exit_requests will be processed as we
* enter the next TB.
*/
-static void gen_goto_tb(DisasContext *s, int n, int diff)
+static void gen_goto_tb(DisasContext *s, int n, target_long diff)
{
target_ulong dest = s->pc_curr + diff;
@@ -2612,10 +2618,8 @@ static void gen_goto_tb(DisasContext *s, int n, int diff)
}
/* Jump, specifying which TB number to use if we gen_goto_tb() */
-static inline void gen_jmp_tb(DisasContext *s, uint32_t dest, int tbno)
+static void gen_jmp_tb(DisasContext *s, target_long diff, int tbno)
{
- int diff = dest - s->pc_curr;
-
if (unlikely(s->ss_active)) {
/* An indirect jump so that we still trigger the debug exception. */
gen_update_pc(s, diff);
@@ -2657,9 +2661,9 @@ static inline void gen_jmp_tb(DisasContext *s, uint32_t dest, int tbno)
}
}
-static inline void gen_jmp(DisasContext *s, uint32_t dest)
+static inline void gen_jmp(DisasContext *s, target_long diff)
{
- gen_jmp_tb(s, dest, 0);
+ gen_jmp_tb(s, diff, 0);
}
static inline void gen_mulxy(TCGv_i32 t0, TCGv_i32 t1, int x, int y)
@@ -8326,7 +8330,7 @@ static bool trans_CLRM(DisasContext *s, arg_CLRM *a)
static bool trans_B(DisasContext *s, arg_i *a)
{
- gen_jmp(s, read_pc(s) + a->imm);
+ gen_jmp(s, jmp_diff(s, a->imm));
return true;
}
@@ -8341,14 +8345,14 @@ static bool trans_B_cond_thumb(DisasContext *s, arg_ci *a)
return true;
}
arm_skip_unless(s, a->cond);
- gen_jmp(s, read_pc(s) + a->imm);
+ gen_jmp(s, jmp_diff(s, a->imm));
return true;
}
static bool trans_BL(DisasContext *s, arg_i *a)
{
tcg_gen_movi_i32(cpu_R[14], s->base.pc_next | s->thumb);
- gen_jmp(s, read_pc(s) + a->imm);
+ gen_jmp(s, jmp_diff(s, a->imm));
return true;
}
@@ -8368,7 +8372,8 @@ static bool trans_BLX_i(DisasContext *s, arg_BLX_i *a)
}
tcg_gen_movi_i32(cpu_R[14], s->base.pc_next | s->thumb);
store_cpu_field_constant(!s->thumb, thumb);
- gen_jmp(s, (read_pc(s) & ~3) + a->imm);
+ /* This jump is computed from an aligned PC: subtract off the low bits. */
+ gen_jmp(s, jmp_diff(s, a->imm - (s->pc_curr & 3)));
return true;
}
@@ -8529,10 +8534,10 @@ static bool trans_WLS(DisasContext *s, arg_WLS *a)
* when we take this upcoming exit from this TB, so gen_jmp_tb() is OK.
*/
}
- gen_jmp_tb(s, s->base.pc_next, 1);
+ gen_jmp_tb(s, curr_insn_len(s), 1);
gen_set_label(nextlabel);
- gen_jmp(s, read_pc(s) + a->imm);
+ gen_jmp(s, jmp_diff(s, a->imm));
return true;
}
@@ -8612,7 +8617,7 @@ static bool trans_LE(DisasContext *s, arg_LE *a)
if (a->f) {
/* Loop-forever: just jump back to the loop start */
- gen_jmp(s, read_pc(s) - a->imm);
+ gen_jmp(s, jmp_diff(s, -a->imm));
return true;
}
@@ -8643,7 +8648,7 @@ static bool trans_LE(DisasContext *s, arg_LE *a)
tcg_temp_free_i32(decr);
}
/* Jump back to the loop start */
- gen_jmp(s, read_pc(s) - a->imm);
+ gen_jmp(s, jmp_diff(s, -a->imm));
gen_set_label(loopend);
if (a->tp) {
@@ -8651,7 +8656,7 @@ static bool trans_LE(DisasContext *s, arg_LE *a)
store_cpu_field(tcg_constant_i32(4), v7m.ltpsize);
}
/* End TB, continuing to following insn */
- gen_jmp_tb(s, s->base.pc_next, 1);
+ gen_jmp_tb(s, curr_insn_len(s), 1);
return true;
}
@@ -8750,7 +8755,7 @@ static bool trans_CBZ(DisasContext *s, arg_CBZ *a)
tcg_gen_brcondi_i32(a->nz ? TCG_COND_EQ : TCG_COND_NE,
tmp, 0, s->condlabel);
tcg_temp_free_i32(tmp);
- gen_jmp(s, read_pc(s) + a->imm);
+ gen_jmp(s, jmp_diff(s, a->imm));
return true;
}
--
2.34.1
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH v6 7/9] target/arm: Introduce gen_pc_plus_diff for aarch64
2022-10-06 3:38 [PATCH v6 0/9] target/arm: pc-relative translation blocks Richard Henderson
` (5 preceding siblings ...)
2022-10-06 3:38 ` [PATCH v6 6/9] target/arm: Change gen_jmp* to work on displacements Richard Henderson
@ 2022-10-06 3:38 ` Richard Henderson
2022-10-06 3:38 ` [PATCH v6 8/9] target/arm: Introduce gen_pc_plus_diff for aarch32 Richard Henderson
2022-10-06 3:38 ` [PATCH v6 9/9] target/arm: Enable TARGET_TB_PCREL Richard Henderson
8 siblings, 0 replies; 12+ messages in thread
From: Richard Henderson @ 2022-10-06 3:38 UTC (permalink / raw)
To: qemu-devel; +Cc: qemu-arm, Peter Maydell
In preparation for TARGET_TB_PCREL, reduce reliance on absolute values.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/arm/translate-a64.c | 41 +++++++++++++++++++++++++++-----------
1 file changed, 29 insertions(+), 12 deletions(-)
diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index 005fd767fb..28a417fb2b 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -148,9 +148,14 @@ static void reset_btype(DisasContext *s)
}
}
+static void gen_pc_plus_diff(DisasContext *s, TCGv_i64 dest, target_long diff)
+{
+ tcg_gen_movi_i64(dest, s->pc_curr + diff);
+}
+
void gen_a64_update_pc(DisasContext *s, target_long diff)
{
- tcg_gen_movi_i64(cpu_pc, s->pc_curr + diff);
+ gen_pc_plus_diff(s, cpu_pc, diff);
}
/*
@@ -1368,7 +1373,7 @@ static void disas_uncond_b_imm(DisasContext *s, uint32_t insn)
if (insn & (1U << 31)) {
/* BL Branch with link */
- tcg_gen_movi_i64(cpu_reg(s, 30), s->base.pc_next);
+ gen_pc_plus_diff(s, cpu_reg(s, 30), curr_insn_len(s));
}
/* B Branch / BL Branch with link */
@@ -2309,11 +2314,17 @@ static void disas_uncond_b_reg(DisasContext *s, uint32_t insn)
default:
goto do_unallocated;
}
- gen_a64_set_pc(s, dst);
/* BLR also needs to load return address */
if (opc == 1) {
- tcg_gen_movi_i64(cpu_reg(s, 30), s->base.pc_next);
+ TCGv_i64 lr = cpu_reg(s, 30);
+ if (dst == lr) {
+ TCGv_i64 tmp = new_tmp_a64(s);
+ tcg_gen_mov_i64(tmp, dst);
+ dst = tmp;
+ }
+ gen_pc_plus_diff(s, lr, curr_insn_len(s));
}
+ gen_a64_set_pc(s, dst);
break;
case 8: /* BRAA */
@@ -2336,11 +2347,17 @@ static void disas_uncond_b_reg(DisasContext *s, uint32_t insn)
} else {
dst = cpu_reg(s, rn);
}
- gen_a64_set_pc(s, dst);
/* BLRAA also needs to load return address */
if (opc == 9) {
- tcg_gen_movi_i64(cpu_reg(s, 30), s->base.pc_next);
+ TCGv_i64 lr = cpu_reg(s, 30);
+ if (dst == lr) {
+ TCGv_i64 tmp = new_tmp_a64(s);
+ tcg_gen_mov_i64(tmp, dst);
+ dst = tmp;
+ }
+ gen_pc_plus_diff(s, lr, curr_insn_len(s));
}
+ gen_a64_set_pc(s, dst);
break;
case 4: /* ERET */
@@ -2908,7 +2925,8 @@ static void disas_ld_lit(DisasContext *s, uint32_t insn)
tcg_rt = cpu_reg(s, rt);
- clean_addr = tcg_constant_i64(s->pc_curr + imm);
+ clean_addr = new_tmp_a64(s);
+ gen_pc_plus_diff(s, clean_addr, imm);
if (is_vector) {
do_fp_ld(s, rt, clean_addr, size);
} else {
@@ -4252,23 +4270,22 @@ static void disas_ldst(DisasContext *s, uint32_t insn)
static void disas_pc_rel_adr(DisasContext *s, uint32_t insn)
{
unsigned int page, rd;
- uint64_t base;
- uint64_t offset;
+ int64_t offset;
page = extract32(insn, 31, 1);
/* SignExtend(immhi:immlo) -> offset */
offset = sextract64(insn, 5, 19);
offset = offset << 2 | extract32(insn, 29, 2);
rd = extract32(insn, 0, 5);
- base = s->pc_curr;
if (page) {
/* ADRP (page based) */
- base &= ~0xfff;
offset <<= 12;
+ /* The page offset is ok for TARGET_TB_PCREL. */
+ offset -= s->pc_curr & 0xfff;
}
- tcg_gen_movi_i64(cpu_reg(s, rd), base + offset);
+ gen_pc_plus_diff(s, cpu_reg(s, rd), offset);
}
/*
--
2.34.1
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH v6 8/9] target/arm: Introduce gen_pc_plus_diff for aarch32
2022-10-06 3:38 [PATCH v6 0/9] target/arm: pc-relative translation blocks Richard Henderson
` (6 preceding siblings ...)
2022-10-06 3:38 ` [PATCH v6 7/9] target/arm: Introduce gen_pc_plus_diff for aarch64 Richard Henderson
@ 2022-10-06 3:38 ` Richard Henderson
2022-10-14 17:53 ` Peter Maydell
2022-10-06 3:38 ` [PATCH v6 9/9] target/arm: Enable TARGET_TB_PCREL Richard Henderson
8 siblings, 1 reply; 12+ messages in thread
From: Richard Henderson @ 2022-10-06 3:38 UTC (permalink / raw)
To: qemu-devel; +Cc: qemu-arm, Philippe Mathieu-Daudé
In preparation for TARGET_TB_PCREL, reduce reliance on absolute values.
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/arm/translate.c | 29 ++++++++++++++++++-----------
1 file changed, 18 insertions(+), 11 deletions(-)
diff --git a/target/arm/translate.c b/target/arm/translate.c
index 336f151c4a..7c1e277732 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -276,11 +276,16 @@ static target_long jmp_diff(DisasContext *s, target_long diff)
return diff + (s->thumb ? 4 : 8);
}
+static void gen_pc_plus_diff(DisasContext *s, TCGv_i32 var, target_long diff)
+{
+ tcg_gen_movi_i32(var, s->pc_curr + diff);
+}
+
/* Set a variable to the value of a CPU register. */
void load_reg_var(DisasContext *s, TCGv_i32 var, int reg)
{
if (reg == 15) {
- tcg_gen_movi_i32(var, read_pc(s));
+ gen_pc_plus_diff(s, var, jmp_diff(s, 0));
} else {
tcg_gen_mov_i32(var, cpu_R[reg]);
}
@@ -296,7 +301,8 @@ TCGv_i32 add_reg_for_lit(DisasContext *s, int reg, int ofs)
TCGv_i32 tmp = tcg_temp_new_i32();
if (reg == 15) {
- tcg_gen_movi_i32(tmp, (read_pc(s) & ~3) + ofs);
+ /* This difference computes a page offset so ok for TARGET_TB_PCREL. */
+ gen_pc_plus_diff(s, tmp, (read_pc(s) & ~3) - s->pc_curr + ofs);
} else {
tcg_gen_addi_i32(tmp, cpu_R[reg], ofs);
}
@@ -1159,7 +1165,7 @@ void unallocated_encoding(DisasContext *s)
/* Force a TB lookup after an instruction that changes the CPU state. */
void gen_lookup_tb(DisasContext *s)
{
- tcg_gen_movi_i32(cpu_R[15], s->base.pc_next);
+ gen_pc_plus_diff(s, cpu_R[15], curr_insn_len(s));
s->base.is_jmp = DISAS_EXIT;
}
@@ -6483,7 +6489,7 @@ static bool trans_BLX_r(DisasContext *s, arg_BLX_r *a)
return false;
}
tmp = load_reg(s, a->rm);
- tcg_gen_movi_i32(cpu_R[14], s->base.pc_next | s->thumb);
+ gen_pc_plus_diff(s, cpu_R[14], curr_insn_len(s) | s->thumb);
gen_bx(s, tmp);
return true;
}
@@ -8351,7 +8357,7 @@ static bool trans_B_cond_thumb(DisasContext *s, arg_ci *a)
static bool trans_BL(DisasContext *s, arg_i *a)
{
- tcg_gen_movi_i32(cpu_R[14], s->base.pc_next | s->thumb);
+ gen_pc_plus_diff(s, cpu_R[14], curr_insn_len(s) | s->thumb);
gen_jmp(s, jmp_diff(s, a->imm));
return true;
}
@@ -8370,7 +8376,7 @@ static bool trans_BLX_i(DisasContext *s, arg_BLX_i *a)
if (s->thumb && (a->imm & 2)) {
return false;
}
- tcg_gen_movi_i32(cpu_R[14], s->base.pc_next | s->thumb);
+ gen_pc_plus_diff(s, cpu_R[14], curr_insn_len(s) | s->thumb);
store_cpu_field_constant(!s->thumb, thumb);
/* This jump is computed from an aligned PC: subtract off the low bits. */
gen_jmp(s, jmp_diff(s, a->imm - (s->pc_curr & 3)));
@@ -8380,7 +8386,7 @@ static bool trans_BLX_i(DisasContext *s, arg_BLX_i *a)
static bool trans_BL_BLX_prefix(DisasContext *s, arg_BL_BLX_prefix *a)
{
assert(!arm_dc_feature(s, ARM_FEATURE_THUMB2));
- tcg_gen_movi_i32(cpu_R[14], read_pc(s) + (a->imm << 12));
+ gen_pc_plus_diff(s, cpu_R[14], jmp_diff(s, a->imm << 12));
return true;
}
@@ -8390,7 +8396,7 @@ static bool trans_BL_suffix(DisasContext *s, arg_BL_suffix *a)
assert(!arm_dc_feature(s, ARM_FEATURE_THUMB2));
tcg_gen_addi_i32(tmp, cpu_R[14], (a->imm << 1) | 1);
- tcg_gen_movi_i32(cpu_R[14], s->base.pc_next | 1);
+ gen_pc_plus_diff(s, cpu_R[14], curr_insn_len(s) | 1);
gen_bx(s, tmp);
return true;
}
@@ -8406,7 +8412,7 @@ static bool trans_BLX_suffix(DisasContext *s, arg_BLX_suffix *a)
tmp = tcg_temp_new_i32();
tcg_gen_addi_i32(tmp, cpu_R[14], a->imm << 1);
tcg_gen_andi_i32(tmp, tmp, 0xfffffffc);
- tcg_gen_movi_i32(cpu_R[14], s->base.pc_next | 1);
+ gen_pc_plus_diff(s, cpu_R[14], curr_insn_len(s) | 1);
gen_bx(s, tmp);
return true;
}
@@ -8729,10 +8735,11 @@ static bool op_tbranch(DisasContext *s, arg_tbranch *a, bool half)
tcg_gen_add_i32(addr, addr, tmp);
gen_aa32_ld_i32(s, tmp, addr, get_mem_index(s), half ? MO_UW : MO_UB);
- tcg_temp_free_i32(addr);
tcg_gen_add_i32(tmp, tmp, tmp);
- tcg_gen_addi_i32(tmp, tmp, read_pc(s));
+ gen_pc_plus_diff(s, addr, jmp_diff(s, 0));
+ tcg_gen_add_i32(tmp, tmp, addr);
+ tcg_temp_free_i32(addr);
store_reg(s, 15, tmp);
return true;
}
--
2.34.1
^ permalink raw reply related [flat|nested] 12+ messages in thread* Re: [PATCH v6 8/9] target/arm: Introduce gen_pc_plus_diff for aarch32
2022-10-06 3:38 ` [PATCH v6 8/9] target/arm: Introduce gen_pc_plus_diff for aarch32 Richard Henderson
@ 2022-10-14 17:53 ` Peter Maydell
2022-10-14 18:46 ` Richard Henderson
0 siblings, 1 reply; 12+ messages in thread
From: Peter Maydell @ 2022-10-14 17:53 UTC (permalink / raw)
To: Richard Henderson; +Cc: qemu-devel, qemu-arm, Philippe Mathieu-Daudé
On Thu, 6 Oct 2022 at 04:55, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> In preparation for TARGET_TB_PCREL, reduce reliance on absolute values.
>
> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> @@ -296,7 +301,8 @@ TCGv_i32 add_reg_for_lit(DisasContext *s, int reg, int ofs)
> TCGv_i32 tmp = tcg_temp_new_i32();
>
> if (reg == 15) {
> - tcg_gen_movi_i32(tmp, (read_pc(s) & ~3) + ofs);
> + /* This difference computes a page offset so ok for TARGET_TB_PCREL. */
> + gen_pc_plus_diff(s, tmp, (read_pc(s) & ~3) - s->pc_curr + ofs);
> } else {
> tcg_gen_addi_i32(tmp, cpu_R[reg], ofs);
> }
This is still doing the pc - pc thing -- I guess my comment on v5
crossed in the mail with your v6 repost.
Otherwise
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
thanks
-- PMM
^ permalink raw reply [flat|nested] 12+ messages in thread* Re: [PATCH v6 8/9] target/arm: Introduce gen_pc_plus_diff for aarch32
2022-10-14 17:53 ` Peter Maydell
@ 2022-10-14 18:46 ` Richard Henderson
0 siblings, 0 replies; 12+ messages in thread
From: Richard Henderson @ 2022-10-14 18:46 UTC (permalink / raw)
To: Peter Maydell; +Cc: qemu-devel, qemu-arm, Philippe Mathieu-Daudé
On 10/15/22 04:53, Peter Maydell wrote:
> On Thu, 6 Oct 2022 at 04:55, Richard Henderson
> <richard.henderson@linaro.org> wrote:
>>
>> In preparation for TARGET_TB_PCREL, reduce reliance on absolute values.
>>
>> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
>> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
>> @@ -296,7 +301,8 @@ TCGv_i32 add_reg_for_lit(DisasContext *s, int reg, int ofs)
>> TCGv_i32 tmp = tcg_temp_new_i32();
>>
>> if (reg == 15) {
>> - tcg_gen_movi_i32(tmp, (read_pc(s) & ~3) + ofs);
>> + /* This difference computes a page offset so ok for TARGET_TB_PCREL. */
>> + gen_pc_plus_diff(s, tmp, (read_pc(s) & ~3) - s->pc_curr + ofs);
>> } else {
>> tcg_gen_addi_i32(tmp, cpu_R[reg], ofs);
>> }
>
> This is still doing the pc - pc thing -- I guess my comment on v5
> crossed in the mail with your v6 repost.
Yes, v6 was posted a couple of days beforehand.
I'll do a v7 with the change soon.
r~
^ permalink raw reply [flat|nested] 12+ messages in thread
* [PATCH v6 9/9] target/arm: Enable TARGET_TB_PCREL
2022-10-06 3:38 [PATCH v6 0/9] target/arm: pc-relative translation blocks Richard Henderson
` (7 preceding siblings ...)
2022-10-06 3:38 ` [PATCH v6 8/9] target/arm: Introduce gen_pc_plus_diff for aarch32 Richard Henderson
@ 2022-10-06 3:38 ` Richard Henderson
8 siblings, 0 replies; 12+ messages in thread
From: Richard Henderson @ 2022-10-06 3:38 UTC (permalink / raw)
To: qemu-devel; +Cc: qemu-arm
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/arm/cpu-param.h | 1 +
target/arm/translate.h | 19 ++++++++++++
target/arm/cpu.c | 23 +++++++-------
target/arm/translate-a64.c | 37 ++++++++++++++++++-----
target/arm/translate.c | 62 ++++++++++++++++++++++++++++++--------
5 files changed, 112 insertions(+), 30 deletions(-)
diff --git a/target/arm/cpu-param.h b/target/arm/cpu-param.h
index 68ffb12427..29c5fc4241 100644
--- a/target/arm/cpu-param.h
+++ b/target/arm/cpu-param.h
@@ -30,6 +30,7 @@
*/
# define TARGET_PAGE_BITS_VARY
# define TARGET_PAGE_BITS_MIN 10
+# define TARGET_TB_PCREL 1
#endif
#define NB_MMU_MODES 15
diff --git a/target/arm/translate.h b/target/arm/translate.h
index 4aa239e23c..1e5888fb6f 100644
--- a/target/arm/translate.h
+++ b/target/arm/translate.h
@@ -12,6 +12,25 @@ typedef struct DisasContext {
/* The address of the current instruction being translated. */
target_ulong pc_curr;
+ /*
+ * For TARGET_TB_PCREL, the full value of cpu_pc is not known
+ * (although the page offset is known). For convenience, the
+ * translation loop uses the full virtual address that triggered
+ * the translation, from base.pc_start through pc_curr.
+ * For efficiency, we do not update cpu_pc for every instruction.
+ * Instead, pc_save has the value of pc_curr at the time of the
+ * last update to cpu_pc, which allows us to compute the addend
+ * needed to bring cpu_pc current: pc_curr - pc_save.
+ * If cpu_pc now contains the destination of an indirect branch,
+ * pc_save contains -1 to indicate that relative updates are no
+ * longer possible.
+ */
+ target_ulong pc_save;
+ /*
+ * Similarly, pc_cond_save contains the value of pc_save at the
+ * beginning of an AArch32 conditional instruction.
+ */
+ target_ulong pc_cond_save;
target_ulong page_start;
uint32_t insn;
/* Nonzero if this instruction has been conditionally skipped. */
diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index 94ca6f163f..0bc5e9b125 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -76,17 +76,18 @@ static vaddr arm_cpu_get_pc(CPUState *cs)
void arm_cpu_synchronize_from_tb(CPUState *cs,
const TranslationBlock *tb)
{
- ARMCPU *cpu = ARM_CPU(cs);
- CPUARMState *env = &cpu->env;
-
- /*
- * It's OK to look at env for the current mode here, because it's
- * never possible for an AArch64 TB to chain to an AArch32 TB.
- */
- if (is_a64(env)) {
- env->pc = tb_pc(tb);
- } else {
- env->regs[15] = tb_pc(tb);
+ /* The program counter is always up to date with TARGET_TB_PCREL. */
+ if (!TARGET_TB_PCREL) {
+ CPUARMState *env = cs->env_ptr;
+ /*
+ * It's OK to look at env for the current mode here, because it's
+ * never possible for an AArch64 TB to chain to an AArch32 TB.
+ */
+ if (is_a64(env)) {
+ env->pc = tb_pc(tb);
+ } else {
+ env->regs[15] = tb_pc(tb);
+ }
}
}
#endif /* CONFIG_TCG */
diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index 28a417fb2b..57cfc9f1a9 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -150,12 +150,18 @@ static void reset_btype(DisasContext *s)
static void gen_pc_plus_diff(DisasContext *s, TCGv_i64 dest, target_long diff)
{
- tcg_gen_movi_i64(dest, s->pc_curr + diff);
+ assert(s->pc_save != -1);
+ if (TARGET_TB_PCREL) {
+ tcg_gen_addi_i64(dest, cpu_pc, (s->pc_curr - s->pc_save) + diff);
+ } else {
+ tcg_gen_movi_i64(dest, s->pc_curr + diff);
+ }
}
void gen_a64_update_pc(DisasContext *s, target_long diff)
{
gen_pc_plus_diff(s, cpu_pc, diff);
+ s->pc_save = s->pc_curr + diff;
}
/*
@@ -209,6 +215,7 @@ static void gen_a64_set_pc(DisasContext *s, TCGv_i64 src)
* then loading an address into the PC will clear out any tag.
*/
gen_top_byte_ignore(s, cpu_pc, src, s->tbii);
+ s->pc_save = -1;
}
/*
@@ -347,16 +354,22 @@ static void gen_exception_internal(int excp)
static void gen_exception_internal_insn(DisasContext *s, int excp)
{
+ target_ulong pc_save = s->pc_save;
+
gen_a64_update_pc(s, 0);
gen_exception_internal(excp);
s->base.is_jmp = DISAS_NORETURN;
+ s->pc_save = pc_save;
}
static void gen_exception_bkpt_insn(DisasContext *s, uint32_t syndrome)
{
+ target_ulong pc_save = s->pc_save;
+
gen_a64_update_pc(s, 0);
gen_helper_exception_bkpt_insn(cpu_env, tcg_constant_i32(syndrome));
s->base.is_jmp = DISAS_NORETURN;
+ s->pc_save = pc_save;
}
static void gen_step_complete_exception(DisasContext *s)
@@ -385,11 +398,16 @@ static inline bool use_goto_tb(DisasContext *s, uint64_t dest)
static void gen_goto_tb(DisasContext *s, int n, int64_t diff)
{
- uint64_t dest = s->pc_curr + diff;
+ target_ulong pc_save = s->pc_save;
- if (use_goto_tb(s, dest)) {
- tcg_gen_goto_tb(n);
- gen_a64_update_pc(s, diff);
+ if (use_goto_tb(s, s->pc_curr + diff)) {
+ if (TARGET_TB_PCREL) {
+ gen_a64_update_pc(s, diff);
+ tcg_gen_goto_tb(n);
+ } else {
+ tcg_gen_goto_tb(n);
+ gen_a64_update_pc(s, diff);
+ }
tcg_gen_exit_tb(s->base.tb, n);
s->base.is_jmp = DISAS_NORETURN;
} else {
@@ -401,6 +419,7 @@ static void gen_goto_tb(DisasContext *s, int n, int64_t diff)
s->base.is_jmp = DISAS_NORETURN;
}
}
+ s->pc_save = pc_save;
}
static void init_tmp_a64_array(DisasContext *s)
@@ -14707,7 +14726,7 @@ static void aarch64_tr_init_disas_context(DisasContextBase *dcbase,
dc->isar = &arm_cpu->isar;
dc->condjmp = 0;
-
+ dc->pc_save = dc->base.pc_first;
dc->aarch64 = true;
dc->thumb = false;
dc->sctlr_b = 0;
@@ -14789,8 +14808,12 @@ static void aarch64_tr_tb_start(DisasContextBase *db, CPUState *cpu)
static void aarch64_tr_insn_start(DisasContextBase *dcbase, CPUState *cpu)
{
DisasContext *dc = container_of(dcbase, DisasContext, base);
+ target_ulong pc_arg = dc->base.pc_next;
- tcg_gen_insn_start(dc->base.pc_next, 0, 0);
+ if (TARGET_TB_PCREL) {
+ pc_arg &= ~TARGET_PAGE_MASK;
+ }
+ tcg_gen_insn_start(pc_arg, 0, 0);
dc->insn_start = tcg_last_op();
}
diff --git a/target/arm/translate.c b/target/arm/translate.c
index 7c1e277732..ee14b70c8b 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -164,6 +164,7 @@ void arm_gen_condlabel(DisasContext *s)
if (!s->condjmp) {
s->condlabel = gen_new_label();
s->condjmp = 1;
+ s->pc_cond_save = s->pc_save;
}
}
@@ -278,7 +279,12 @@ static target_long jmp_diff(DisasContext *s, target_long diff)
static void gen_pc_plus_diff(DisasContext *s, TCGv_i32 var, target_long diff)
{
- tcg_gen_movi_i32(var, s->pc_curr + diff);
+ assert(s->pc_save != -1);
+ if (TARGET_TB_PCREL) {
+ tcg_gen_addi_i32(var, cpu_R[15], (s->pc_curr - s->pc_save) + diff);
+ } else {
+ tcg_gen_movi_i32(var, s->pc_curr + diff);
+ }
}
/* Set a variable to the value of a CPU register. */
@@ -321,6 +327,7 @@ void store_reg(DisasContext *s, int reg, TCGv_i32 var)
*/
tcg_gen_andi_i32(var, var, s->thumb ? ~1 : ~3);
s->base.is_jmp = DISAS_JUMP;
+ s->pc_save = -1;
} else if (reg == 13 && arm_dc_feature(s, ARM_FEATURE_M)) {
/* For M-profile SP bits [1:0] are always zero */
tcg_gen_andi_i32(var, var, ~3);
@@ -786,7 +793,8 @@ void gen_set_condexec(DisasContext *s)
void gen_update_pc(DisasContext *s, target_long diff)
{
- tcg_gen_movi_i32(cpu_R[15], s->pc_curr + diff);
+ gen_pc_plus_diff(s, cpu_R[15], diff);
+ s->pc_save = s->pc_curr + diff;
}
/* Set PC and Thumb state from var. var is marked as dead. */
@@ -796,6 +804,7 @@ static inline void gen_bx(DisasContext *s, TCGv_i32 var)
tcg_gen_andi_i32(cpu_R[15], var, ~1);
tcg_gen_andi_i32(var, var, 1);
store_cpu_field(var, thumb);
+ s->pc_save = -1;
}
/*
@@ -1118,6 +1127,8 @@ static void gen_exception(int excp, uint32_t syndrome)
static void gen_exception_insn_el_v(DisasContext *s, target_long pc_diff,
int excp, uint32_t syn, TCGv_i32 tcg_el)
{
+ target_ulong pc_save = s->pc_save;
+
if (s->aarch64) {
gen_a64_update_pc(s, pc_diff);
} else {
@@ -1126,6 +1137,7 @@ static void gen_exception_insn_el_v(DisasContext *s, target_long pc_diff,
}
gen_exception_el_v(excp, syn, tcg_el);
s->base.is_jmp = DISAS_NORETURN;
+ s->pc_save = pc_save;
}
void gen_exception_insn_el(DisasContext *s, target_long pc_diff, int excp,
@@ -1138,6 +1150,8 @@ void gen_exception_insn_el(DisasContext *s, target_long pc_diff, int excp,
void gen_exception_insn(DisasContext *s, target_long pc_diff,
int excp, uint32_t syn)
{
+ target_ulong pc_save = s->pc_save;
+
if (s->aarch64) {
gen_a64_update_pc(s, pc_diff);
} else {
@@ -1146,6 +1160,7 @@ void gen_exception_insn(DisasContext *s, target_long pc_diff,
}
gen_exception(excp, syn);
s->base.is_jmp = DISAS_NORETURN;
+ s->pc_save = pc_save;
}
static void gen_exception_bkpt_insn(DisasContext *s, uint32_t syn)
@@ -2610,11 +2625,14 @@ static void gen_goto_ptr(void)
*/
static void gen_goto_tb(DisasContext *s, int n, target_long diff)
{
- target_ulong dest = s->pc_curr + diff;
-
- if (translator_use_goto_tb(&s->base, dest)) {
- tcg_gen_goto_tb(n);
- gen_update_pc(s, diff);
+ if (translator_use_goto_tb(&s->base, s->pc_curr + diff)) {
+ if (TARGET_TB_PCREL) {
+ gen_update_pc(s, diff);
+ tcg_gen_goto_tb(n);
+ } else {
+ tcg_gen_goto_tb(n);
+ gen_update_pc(s, diff);
+ }
tcg_gen_exit_tb(s->base.tb, n);
} else {
gen_update_pc(s, diff);
@@ -2626,10 +2644,13 @@ static void gen_goto_tb(DisasContext *s, int n, target_long diff)
/* Jump, specifying which TB number to use if we gen_goto_tb() */
static void gen_jmp_tb(DisasContext *s, target_long diff, int tbno)
{
+ target_ulong pc_save = s->pc_save;
+
if (unlikely(s->ss_active)) {
/* An indirect jump so that we still trigger the debug exception. */
gen_update_pc(s, diff);
s->base.is_jmp = DISAS_JUMP;
+ s->pc_save = pc_save;
return;
}
switch (s->base.is_jmp) {
@@ -2665,6 +2686,7 @@ static void gen_jmp_tb(DisasContext *s, target_long diff, int tbno)
*/
g_assert_not_reached();
}
+ s->pc_save = pc_save;
}
static inline void gen_jmp(DisasContext *s, target_long diff)
@@ -9326,7 +9348,7 @@ static void arm_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
dc->isar = &cpu->isar;
dc->condjmp = 0;
-
+ dc->pc_save = dc->base.pc_first;
dc->aarch64 = false;
dc->thumb = EX_TBFLAG_AM32(tb_flags, THUMB);
dc->be_data = EX_TBFLAG_ANY(tb_flags, BE_DATA) ? MO_BE : MO_LE;
@@ -9481,13 +9503,17 @@ static void arm_tr_insn_start(DisasContextBase *dcbase, CPUState *cpu)
* fields here.
*/
uint32_t condexec_bits;
+ target_ulong pc_arg = dc->base.pc_next;
+ if (TARGET_TB_PCREL) {
+ pc_arg &= ~TARGET_PAGE_MASK;
+ }
if (dc->eci) {
condexec_bits = dc->eci << 4;
} else {
condexec_bits = (dc->condexec_cond << 4) | (dc->condexec_mask >> 1);
}
- tcg_gen_insn_start(dc->base.pc_next, condexec_bits, 0);
+ tcg_gen_insn_start(pc_arg, condexec_bits, 0);
dc->insn_start = tcg_last_op();
}
@@ -9530,7 +9556,10 @@ static bool arm_check_ss_active(DisasContext *dc)
static void arm_post_translate_insn(DisasContext *dc)
{
- if (dc->condjmp && !dc->base.is_jmp) {
+ if (dc->condjmp && dc->base.is_jmp == DISAS_NEXT) {
+ if (dc->pc_save != dc->pc_cond_save) {
+ gen_update_pc(dc, dc->pc_cond_save - dc->pc_save);
+ }
gen_set_label(dc->condlabel);
dc->condjmp = 0;
}
@@ -9860,6 +9889,7 @@ static void arm_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
if (dc->condjmp) {
/* "Condition failed" instruction codepath for the branch/trap insn */
+ dc->pc_save = dc->pc_cond_save;
gen_set_label(dc->condlabel);
gen_set_condexec(dc);
if (unlikely(dc->ss_active)) {
@@ -9922,11 +9952,19 @@ void restore_state_to_opc(CPUARMState *env, TranslationBlock *tb,
target_ulong *data)
{
if (is_a64(env)) {
- env->pc = data[0];
+ if (TARGET_TB_PCREL) {
+ env->pc = (env->pc & TARGET_PAGE_MASK) | data[0];
+ } else {
+ env->pc = data[0];
+ }
env->condexec_bits = 0;
env->exception.syndrome = data[2] << ARM_INSN_START_WORD2_SHIFT;
} else {
- env->regs[15] = data[0];
+ if (TARGET_TB_PCREL) {
+ env->regs[15] = (env->regs[15] & TARGET_PAGE_MASK) | data[0];
+ } else {
+ env->regs[15] = data[0];
+ }
env->condexec_bits = data[1];
env->exception.syndrome = data[2] << ARM_INSN_START_WORD2_SHIFT;
}
--
2.34.1
^ permalink raw reply related [flat|nested] 12+ messages in thread