diff options
Diffstat (limited to 'linux-user')
| -rw-r--r-- | linux-user/main.c | 76 |
1 files changed, 75 insertions, 1 deletions
diff --git a/linux-user/main.c b/linux-user/main.c index 29845f9c81..cb14c0bcad 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -2186,6 +2186,33 @@ static int do_store_exclusive(CPUMIPSState *env) return segv; } +/* Break codes */ +enum { + BRK_OVERFLOW = 6, + BRK_DIVZERO = 7 +}; + +static int do_break(CPUMIPSState *env, target_siginfo_t *info, + unsigned int code) +{ + int ret = -1; + + switch (code) { + case BRK_OVERFLOW: + case BRK_DIVZERO: + info->si_signo = TARGET_SIGFPE; + info->si_errno = 0; + info->si_code = (code == BRK_OVERFLOW) ? FPE_INTOVF : FPE_INTDIV; + queue_signal(env, info->si_signo, &*info); + ret = 0; + break; + default: + break; + } + + return ret; +} + void cpu_loop(CPUMIPSState *env) { CPUState *cs = CPU(mips_env_get_cpu(env)); @@ -2302,8 +2329,55 @@ done_syscall: info.si_code = TARGET_ILL_ILLOPC; queue_signal(env, info.si_signo, &info); break; + /* The code below was inspired by the MIPS Linux kernel trap + * handling code in arch/mips/kernel/traps.c. + */ + case EXCP_BREAK: + { + abi_ulong trap_instr; + unsigned int code; + + ret = get_user_ual(trap_instr, env->active_tc.PC); + if (ret != 0) { + goto error; + } + + /* As described in the original Linux kernel code, the + * below checks on 'code' are to work around an old + * assembly bug. + */ + code = ((trap_instr >> 6) & ((1 << 20) - 1)); + if (code >= (1 << 10)) { + code >>= 10; + } + + if (do_break(env, &info, code) != 0) { + goto error; + } + } + break; + case EXCP_TRAP: + { + abi_ulong trap_instr; + unsigned int code = 0; + + ret = get_user_ual(trap_instr, env->active_tc.PC); + if (ret != 0) { + goto error; + } + + /* The immediate versions don't provide a code. */ + if (!(trap_instr & 0xFC000000)) { + code = ((trap_instr >> 6) & ((1 << 10) - 1)); + } + + if (do_break(env, &info, code) != 0) { + goto error; + } + } + break; default: - // error: +error: fprintf(stderr, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr); cpu_dump_state(env, stderr, fprintf, 0); |