From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: Peter Maydell <peter.maydell@linaro.org>
Subject: [PATCH v4 42/48] tcg/i386: Support raising sigbus for user-only
Date: Tue, 12 Oct 2021 19:46:01 -0700 [thread overview]
Message-ID: <20211013024607.731881-43-richard.henderson@linaro.org> (raw)
In-Reply-To: <20211013024607.731881-1-richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
tcg/i386/tcg-target.h | 2 -
tcg/i386/tcg-target.c.inc | 103 ++++++++++++++++++++++++++++++++++++--
2 files changed, 98 insertions(+), 7 deletions(-)
diff --git a/tcg/i386/tcg-target.h b/tcg/i386/tcg-target.h
index b00a6da293..3b2c9437a0 100644
--- a/tcg/i386/tcg-target.h
+++ b/tcg/i386/tcg-target.h
@@ -232,9 +232,7 @@ static inline void tb_target_set_jmp_target(uintptr_t tc_ptr, uintptr_t jmp_rx,
#define TCG_TARGET_HAS_MEMORY_BSWAP have_movbe
-#ifdef CONFIG_SOFTMMU
#define TCG_TARGET_NEED_LDST_LABELS
-#endif
#define TCG_TARGET_NEED_POOL_LABELS
#endif
diff --git a/tcg/i386/tcg-target.c.inc b/tcg/i386/tcg-target.c.inc
index 84b109bb84..e073868d8f 100644
--- a/tcg/i386/tcg-target.c.inc
+++ b/tcg/i386/tcg-target.c.inc
@@ -22,6 +22,7 @@
* THE SOFTWARE.
*/
+#include "../tcg-ldst.c.inc"
#include "../tcg-pool.c.inc"
#ifdef CONFIG_DEBUG_TCG
@@ -421,8 +422,9 @@ static bool tcg_target_const_match(int64_t val, TCGType type, int ct)
#define OPC_VZEROUPPER (0x77 | P_EXT)
#define OPC_XCHG_ax_r32 (0x90)
-#define OPC_GRP3_Ev (0xf7)
-#define OPC_GRP5 (0xff)
+#define OPC_GRP3_Eb (0xf6)
+#define OPC_GRP3_Ev (0xf7)
+#define OPC_GRP5 (0xff)
#define OPC_GRP14 (0x73 | P_EXT | P_DATA16)
/* Group 1 opcode extensions for 0x80-0x83.
@@ -444,6 +446,7 @@ static bool tcg_target_const_match(int64_t val, TCGType type, int ct)
#define SHIFT_SAR 7
/* Group 3 opcode extensions for 0xf6, 0xf7. To be used with OPC_GRP3. */
+#define EXT3_TESTi 0
#define EXT3_NOT 2
#define EXT3_NEG 3
#define EXT3_MUL 4
@@ -1606,8 +1609,6 @@ static void tcg_out_nopn(TCGContext *s, int n)
}
#if defined(CONFIG_SOFTMMU)
-#include "../tcg-ldst.c.inc"
-
/* helper signature: helper_ret_ld_mmu(CPUState *env, target_ulong addr,
* int mmu_idx, uintptr_t ra)
*/
@@ -1916,7 +1917,84 @@ static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
tcg_out_jmp(s, qemu_st_helpers[opc & (MO_BSWAP | MO_SIZE)]);
return true;
}
-#elif TCG_TARGET_REG_BITS == 32
+#else
+
+static void tcg_out_test_alignment(TCGContext *s, bool is_ld, TCGReg addrlo,
+ TCGReg addrhi, unsigned a_bits)
+{
+ unsigned a_mask = (1 << a_bits) - 1;
+ TCGLabelQemuLdst *label;
+
+ /*
+ * We are expecting a_bits to max out at 7, so we can usually use testb.
+ * For i686, we have to use testl for %esi/%edi.
+ */
+ if (a_mask <= 0xff && (TCG_TARGET_REG_BITS == 64 || addrlo < 4)) {
+ tcg_out_modrm(s, OPC_GRP3_Eb | P_REXB_RM, EXT3_TESTi, addrlo);
+ tcg_out8(s, a_mask);
+ } else {
+ tcg_out_modrm(s, OPC_GRP3_Ev, EXT3_TESTi, addrlo);
+ tcg_out32(s, a_mask);
+ }
+
+ /* jne slow_path */
+ tcg_out_opc(s, OPC_JCC_long + JCC_JNE, 0, 0, 0);
+
+ label = new_ldst_label(s);
+ label->is_ld = is_ld;
+ label->addrlo_reg = addrlo;
+ label->addrhi_reg = addrhi;
+ label->raddr = tcg_splitwx_to_rx(s->code_ptr + 4);
+ label->label_ptr[0] = s->code_ptr;
+
+ s->code_ptr += 4;
+}
+
+static bool tcg_out_fail_alignment(TCGContext *s, TCGLabelQemuLdst *l)
+{
+ /* resolve label address */
+ tcg_patch32(l->label_ptr[0], s->code_ptr - l->label_ptr[0] - 4);
+
+ if (TCG_TARGET_REG_BITS == 32) {
+ int ofs = 0;
+
+ tcg_out_st(s, TCG_TYPE_PTR, TCG_AREG0, TCG_REG_ESP, ofs);
+ ofs += 4;
+
+ tcg_out_st(s, TCG_TYPE_I32, l->addrlo_reg, TCG_REG_ESP, ofs);
+ ofs += 4;
+ if (TARGET_LONG_BITS == 64) {
+ tcg_out_st(s, TCG_TYPE_I32, l->addrhi_reg, TCG_REG_ESP, ofs);
+ ofs += 4;
+ }
+
+ tcg_out_pushi(s, (uintptr_t)l->raddr);
+ } else {
+ tcg_out_mov(s, TCG_TYPE_TL, tcg_target_call_iarg_regs[1],
+ l->addrlo_reg);
+ tcg_out_mov(s, TCG_TYPE_PTR, tcg_target_call_iarg_regs[0], TCG_AREG0);
+
+ tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_RAX, (uintptr_t)l->raddr);
+ tcg_out_push(s, TCG_REG_RAX);
+ }
+
+ /* "Tail call" to the helper, with the return address back inline. */
+ tcg_out_jmp(s, (const void *)(l->is_ld ? helper_unaligned_ld
+ : helper_unaligned_st));
+ return true;
+}
+
+static bool tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
+{
+ return tcg_out_fail_alignment(s, l);
+}
+
+static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
+{
+ return tcg_out_fail_alignment(s, l);
+}
+
+#if TCG_TARGET_REG_BITS == 32
# define x86_guest_base_seg 0
# define x86_guest_base_index -1
# define x86_guest_base_offset guest_base
@@ -1950,6 +2028,7 @@ static inline int setup_guest_base_seg(void)
return 0;
}
# endif
+#endif
#endif /* SOFTMMU */
static void tcg_out_qemu_ld_direct(TCGContext *s, TCGReg datalo, TCGReg datahi,
@@ -2059,6 +2138,8 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, bool is64)
#if defined(CONFIG_SOFTMMU)
int mem_index;
tcg_insn_unit *label_ptr[2];
+#else
+ unsigned a_bits;
#endif
datalo = *args++;
@@ -2081,6 +2162,11 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, bool is64)
add_qemu_ldst_label(s, true, is64, oi, datalo, datahi, addrlo, addrhi,
s->code_ptr, label_ptr);
#else
+ a_bits = get_alignment_bits(opc);
+ if (a_bits) {
+ tcg_out_test_alignment(s, true, addrlo, addrhi, a_bits);
+ }
+
tcg_out_qemu_ld_direct(s, datalo, datahi, addrlo, x86_guest_base_index,
x86_guest_base_offset, x86_guest_base_seg,
is64, opc);
@@ -2148,6 +2234,8 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, bool is64)
#if defined(CONFIG_SOFTMMU)
int mem_index;
tcg_insn_unit *label_ptr[2];
+#else
+ unsigned a_bits;
#endif
datalo = *args++;
@@ -2170,6 +2258,11 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, bool is64)
add_qemu_ldst_label(s, false, is64, oi, datalo, datahi, addrlo, addrhi,
s->code_ptr, label_ptr);
#else
+ a_bits = get_alignment_bits(opc);
+ if (a_bits) {
+ tcg_out_test_alignment(s, false, addrlo, addrhi, a_bits);
+ }
+
tcg_out_qemu_st_direct(s, datalo, datahi, addrlo, x86_guest_base_index,
x86_guest_base_offset, x86_guest_base_seg, opc);
#endif
--
2.25.1
next prev parent reply other threads:[~2021-10-13 3:22 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-13 2:45 [PATCH v4 00/48] Richard Henderson
2021-10-13 2:45 ` [PATCH v4 01/48] hw/core: Add TCGCPUOps.record_sigbus Richard Henderson
2021-10-13 2:45 ` [PATCH v4 02/48] linux-user: Add cpu_loop_exit_sigbus Richard Henderson
2021-10-13 2:45 ` [PATCH v4 03/48] linux-user/alpha: Remove EXCP_UNALIGN handling Richard Henderson
2021-10-13 2:45 ` [PATCH v4 04/48] target/arm: Implement arm_cpu_record_sigbus Richard Henderson
2021-10-13 2:45 ` [PATCH v4 05/48] linux-user/hppa: Remove EXCP_UNALIGN handling Richard Henderson
2021-10-13 2:45 ` [PATCH v4 06/48] target/microblaze: Do not set MO_ALIGN for user-only Richard Henderson
2021-10-13 2:45 ` [PATCH v4 07/48] target/ppc: Move SPR_DSISR setting to powerpc_excp Richard Henderson
2021-10-13 2:45 ` [PATCH v4 08/48] target/ppc: Set fault address in ppc_cpu_do_unaligned_access Richard Henderson
2021-10-13 2:45 ` [PATCH v4 09/48] target/ppc: Restrict ppc_cpu_do_unaligned_access to sysemu Richard Henderson
2021-10-13 2:54 ` Warner Losh
2021-10-13 2:45 ` [PATCH v4 10/48] target/s390x: Implement s390x_cpu_record_sigbus Richard Henderson
2021-10-13 2:45 ` [PATCH v4 11/48] linux-user/hppa: Remove POWERPC_EXCP_ALIGN handling Richard Henderson
2021-10-13 2:45 ` [PATCH v4 12/48] target/sh4: Set fault address in superh_cpu_do_unaligned_access Richard Henderson
2021-10-13 2:45 ` [PATCH v4 13/48] target/sparc: Remove DEBUG_UNALIGNED Richard Henderson
2021-10-13 2:45 ` [PATCH v4 14/48] target/sparc: Split out build_sfsr Richard Henderson
2021-10-13 2:45 ` [PATCH v4 15/48] target/sparc: Set fault address in sparc_cpu_do_unaligned_access Richard Henderson
2021-10-13 2:45 ` [PATCH v4 16/48] accel/tcg: Report unaligned atomics for user-only Richard Henderson
2021-10-13 2:45 ` [PATCH v4 17/48] target/arm: Use MO_128 for 16 byte atomics Richard Henderson
2021-10-13 2:45 ` [PATCH v4 18/48] target/i386: " Richard Henderson
2021-10-13 2:45 ` [PATCH v4 19/48] target/ppc: " Richard Henderson
2021-10-13 2:45 ` [PATCH v4 20/48] target/s390x: " Richard Henderson
2021-10-13 2:45 ` [PATCH v4 21/48] target/hexagon: Implement cpu_mmu_index Richard Henderson
2021-10-13 2:45 ` [PATCH v4 22/48] accel/tcg: Add cpu_{ld,st}*_mmu interfaces Richard Henderson
2021-10-13 2:45 ` [PATCH v4 23/48] accel/tcg: Move cpu_atomic decls to exec/cpu_ldst.h Richard Henderson
2021-10-13 2:45 ` [PATCH v4 24/48] target/mips: Use cpu_*_data_ra for msa load/store Richard Henderson
2021-10-13 2:45 ` [PATCH v4 25/48] target/mips: Use 8-byte memory ops " Richard Henderson
2021-10-13 2:45 ` [PATCH v4 26/48] target/s390x: Use cpu_*_mmu instead of helper_*_mmu Richard Henderson
2021-10-13 2:45 ` [PATCH v4 27/48] target/sparc: " Richard Henderson
2021-10-13 2:45 ` [PATCH v4 28/48] target/arm: " Richard Henderson
2021-10-13 2:45 ` [PATCH v4 29/48] tcg: Move helper_*_mmu decls to tcg/tcg-ldst.h Richard Henderson
2021-10-13 2:45 ` [PATCH v4 30/48] tcg: Add helper_unaligned_{ld, st} for user-only sigbus Richard Henderson
2021-10-13 2:45 ` [PATCH v4 31/48] linux-user: Split out do_prctl and subroutines Richard Henderson
2021-10-13 2:45 ` [PATCH v4 32/48] linux-user: Disable more prctl subcodes Richard Henderson
2021-10-13 2:45 ` [PATCH v4 33/48] Revert "cpu: Move cpu_common_props to hw/core/cpu.c" Richard Henderson
2021-10-13 2:45 ` [PATCH v4 34/48] linux-user: Add code for PR_GET/SET_UNALIGN Richard Henderson
2021-10-13 2:45 ` [PATCH v4 35/48] target/alpha: Reorg fp memory operations Richard Henderson
2021-10-13 2:45 ` [PATCH v4 36/48] target/alpha: Reorg integer " Richard Henderson
2021-10-13 2:45 ` [PATCH v4 37/48] target/alpha: Implement prctl_unalign_sigbus Richard Henderson
2021-10-13 2:45 ` [PATCH v4 38/48] target/hppa: " Richard Henderson
2021-10-13 2:45 ` [PATCH v4 39/48] target/sh4: " Richard Henderson
2021-10-13 2:45 ` [PATCH v4 40/48] linux-user/signal: Handle BUS_ADRALN in host_signal_handler Richard Henderson
2021-10-13 2:46 ` [PATCH v4 41/48] tcg: Canonicalize alignment flags in MemOp Richard Henderson
2021-10-13 2:46 ` Richard Henderson [this message]
2021-10-13 2:46 ` [PATCH v4 43/48] tcg/aarch64: Support raising sigbus for user-only Richard Henderson
2021-10-13 2:46 ` [PATCH v4 44/48] tcg/ppc: " Richard Henderson
2021-10-13 2:46 ` [PATCH v4 45/48] tcg/s390: " Richard Henderson
2021-10-13 2:46 ` [PATCH v4 46/48] tcg/tci: " Richard Henderson
2021-10-13 2:46 ` [PATCH v4 47/48] tcg/riscv: " Richard Henderson
2021-10-13 2:46 ` [PATCH v4 48/48] tests/tcg/multiarch: Add sigbus.c Richard Henderson
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