From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: marex@denx.de, crwulff@gmail.com, alex.bennee@linaro.org,
laurent@vivier.eu
Subject: [PATCH 2/9] linux-user/nios2: Properly emulate EXCP_TRAP
Date: Fri, 1 Oct 2021 11:33:39 -0400 [thread overview]
Message-ID: <20211001153347.1736014-4-richard.henderson@linaro.org> (raw)
In-Reply-To: <20211001153347.1736014-1-richard.henderson@linaro.org>
The real kernel has to load the instruction and extract
the imm5 field; for qemu, modify the translator to do this.
The use of R_AT for this in cpu_loop was a bug. Handle
the other trap numbers as per the kernel's trap_table.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/nios2/cpu.h | 2 +-
linux-user/nios2/cpu_loop.c | 40 ++++++++++++++++++++-----------------
target/nios2/translate.c | 17 +++++++++++++++-
3 files changed, 39 insertions(+), 20 deletions(-)
diff --git a/target/nios2/cpu.h b/target/nios2/cpu.h
index a80587338a..f8c9d11f2f 100644
--- a/target/nios2/cpu.h
+++ b/target/nios2/cpu.h
@@ -160,9 +160,9 @@ struct CPUNios2State {
#if !defined(CONFIG_USER_ONLY)
Nios2MMU mmu;
-
uint32_t irq_pending;
#endif
+ int error_code;
};
/**
diff --git a/linux-user/nios2/cpu_loop.c b/linux-user/nios2/cpu_loop.c
index 34290fb3b5..5c3d01d22d 100644
--- a/linux-user/nios2/cpu_loop.c
+++ b/linux-user/nios2/cpu_loop.c
@@ -26,7 +26,6 @@
void cpu_loop(CPUNios2State *env)
{
CPUState *cs = env_cpu(env);
- Nios2CPU *cpu = NIOS2_CPU(cs);
target_siginfo_t info;
int trapnr, ret;
@@ -39,9 +38,10 @@ void cpu_loop(CPUNios2State *env)
case EXCP_INTERRUPT:
/* just indicate that signals should be handled asap */
break;
+
case EXCP_TRAP:
- if (env->regs[R_AT] == 0) {
- abi_long ret;
+ switch (env->error_code) {
+ case 0:
qemu_log_mask(CPU_LOG_INT, "\nSyscall\n");
ret = do_syscall(env, env->regs[2],
@@ -55,26 +55,30 @@ void cpu_loop(CPUNios2State *env)
env->regs[2] = abs(ret);
/* Return value is 0..4096 */
- env->regs[7] = (ret > 0xfffffffffffff000ULL);
- env->regs[CR_ESTATUS] = env->regs[CR_STATUS];
- env->regs[CR_STATUS] &= ~0x3;
- env->regs[R_EA] = env->regs[R_PC] + 4;
+ env->regs[7] = ret > 0xfffff000u;
env->regs[R_PC] += 4;
break;
- } else {
- qemu_log_mask(CPU_LOG_INT, "\nTrap\n");
- env->regs[CR_ESTATUS] = env->regs[CR_STATUS];
- env->regs[CR_STATUS] &= ~0x3;
- env->regs[R_EA] = env->regs[R_PC] + 4;
- env->regs[R_PC] = cpu->exception_addr;
-
- info.si_signo = TARGET_SIGTRAP;
- info.si_errno = 0;
- info.si_code = TARGET_TRAP_BRKPT;
- queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
+ case 1:
+ qemu_log_mask(CPU_LOG_INT, "\nTrap 1\n");
+ force_sig_fault(TARGET_SIGUSR1, 0, env->regs[R_PC]);
+ break;
+ case 2:
+ qemu_log_mask(CPU_LOG_INT, "\nTrap 2\n");
+ force_sig_fault(TARGET_SIGUSR2, 0, env->regs[R_PC]);
+ break;
+ case 31:
+ qemu_log_mask(CPU_LOG_INT, "\nTrap 31\n");
+ force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->regs[R_PC]);
+ break;
+ default:
+ qemu_log_mask(CPU_LOG_INT, "\nTrap %d\n", env->error_code);
+ force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLTRP,
+ env->regs[R_PC]);
break;
}
+ break;
+
case EXCP_DEBUG:
info.si_signo = TARGET_SIGTRAP;
info.si_errno = 0;
diff --git a/target/nios2/translate.c b/target/nios2/translate.c
index 08d7ac5398..a759877519 100644
--- a/target/nios2/translate.c
+++ b/target/nios2/translate.c
@@ -636,6 +636,21 @@ static void divu(DisasContext *dc, uint32_t code, uint32_t flags)
tcg_temp_free(t0);
}
+static void trap(DisasContext *dc, uint32_t code, uint32_t flags)
+{
+#ifdef CONFIG_USER_ONLY
+ /*
+ * The imm5 field is not stored anywhere on real hw; the kernel
+ * has to load the insn and extract the field. But we can make
+ * things easier for cpu_loop if we pop this into env->error_code.
+ */
+ R_TYPE(instr, code);
+ tcg_gen_st_i32(tcg_constant_i32(instr.imm5), cpu_env,
+ offsetof(CPUNios2State, error_code));
+#endif
+ t_gen_helper_raise_exception(dc, EXCP_TRAP);
+}
+
static const Nios2Instruction r_type_instructions[] = {
INSTRUCTION_ILLEGAL(),
INSTRUCTION(eret), /* eret */
@@ -682,7 +697,7 @@ static const Nios2Instruction r_type_instructions[] = {
INSTRUCTION_ILLEGAL(),
INSTRUCTION_ILLEGAL(),
INSTRUCTION_ILLEGAL(),
- INSTRUCTION_FLG(gen_excp, EXCP_TRAP), /* trap */
+ INSTRUCTION(trap), /* trap */
INSTRUCTION(wrctl), /* wrctl */
INSTRUCTION_ILLEGAL(),
INSTRUCTION_FLG(gen_cmpxx, TCG_COND_LTU), /* cmpltu */
--
2.25.1
next prev parent reply other threads:[~2021-10-01 15:38 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-01 15:33 [PATCH 0/9] nios2: Enable cross compile and fix signals Richard Henderson
2021-10-01 15:33 ` [PATCH 1/9] tests/docker: Add debian-nios2-cross image Richard Henderson
2021-10-12 17:03 ` Alex Bennée
2021-10-12 18:24 ` Richard Henderson
2021-10-12 18:33 ` Alex Bennée
2021-10-14 9:34 ` Alex Bennée
2021-10-14 17:17 ` Richard Henderson
2021-10-14 17:25 ` Alex Bennée
2021-10-01 15:33 ` [PATCH 1/2] tests/docker: Remove fedora-i386-cross from DOCKER_PARTIAL_IMAGES Richard Henderson
2021-10-14 9:35 ` Alex Bennée
2021-10-01 15:33 ` Richard Henderson [this message]
2021-10-14 9:36 ` [PATCH 2/9] linux-user/nios2: Properly emulate EXCP_TRAP Alex Bennée
2021-10-01 15:33 ` [PATCH 2/2] tests/docker: Fix fedora-i386-cross Richard Henderson
2021-10-14 9:38 ` Alex Bennée
2021-10-01 15:33 ` [PATCH 3/9] linux-user/nios2: Fixes for signal frame setup Richard Henderson
2021-10-14 9:43 ` Alex Bennée
2021-10-01 15:33 ` [PATCH 4/9] linux-user/elfload: Rename ARM_COMMPAGE to HI_COMMPAGE Richard Henderson
2021-10-12 6:11 ` Laurent Vivier
2021-10-01 15:33 ` [PATCH 5/9] linux-user/nios2: Map a real kuser page Richard Henderson
2021-10-01 15:33 ` [PATCH 6/9] linux-user/nios2: Fix EA vs PC confusion Richard Henderson
2021-10-01 15:33 ` [PATCH 7/9] linux-user/nios2: Fix sigmask in setup_rt_frame Richard Henderson
2021-10-12 6:16 ` Laurent Vivier
2021-10-01 15:33 ` [PATCH 8/9] linux-user/nios2: Use set_sigmask in do_rt_sigreturn Richard Henderson
2021-10-12 6:29 ` Laurent Vivier
2021-10-01 15:33 ` [PATCH 9/9] tests/tcg: Enable container_cross_cc for nios2 Richard Henderson
2021-10-11 19:06 ` [PATCH 0/9] nios2: Enable cross compile and fix signals Richard Henderson
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