diff options
| author | Richard Henderson <richard.henderson@linaro.org> | 2021-12-20 18:50:06 -0800 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2022-01-06 11:40:52 +0100 |
| commit | 87d7bfdba1d4a963e9a89052c38a32327fa25473 (patch) | |
| tree | 66821d335d044d60874d21e5bb09dd4054b275d2 /linux-user/nios2 | |
| parent | e13685a6e5c92612c6eeeb8a17c052539c0f9da5 (diff) | |
linux-user/nios2: Properly emulate EXCP_TRAP
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.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20211221025012.1057923-2-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Diffstat (limited to 'linux-user/nios2')
| -rw-r--r-- | linux-user/nios2/cpu_loop.c | 40 |
1 files changed, 22 insertions, 18 deletions
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; |