diff options
Diffstat (limited to 'linux-user/arm')
| -rw-r--r-- | linux-user/arm/cpu_loop.c | 125 | ||||
| -rw-r--r-- | linux-user/arm/signal.c | 9 |
2 files changed, 68 insertions, 66 deletions
diff --git a/linux-user/arm/cpu_loop.c b/linux-user/arm/cpu_loop.c index 989d03cd89..69632d15be 100644 --- a/linux-user/arm/cpu_loop.c +++ b/linux-user/arm/cpu_loop.c @@ -224,6 +224,64 @@ static bool insn_is_linux_bkpt(uint32_t opcode, bool is_thumb) } } +static bool emulate_arm_fpa11(CPUARMState *env, uint32_t opcode) +{ + TaskState *ts = env_cpu(env)->opaque; + int rc = EmulateAll(opcode, &ts->fpa, env); + int raise, enabled; + + if (rc == 0) { + /* Illegal instruction */ + return false; + } + if (rc > 0) { + /* Everything ok. */ + env->regs[15] += 4; + return true; + } + + /* FP exception */ + rc = -rc; + raise = 0; + + /* Translate softfloat flags to FPSR flags */ + if (rc & float_flag_invalid) { + raise |= BIT_IOC; + } + if (rc & float_flag_divbyzero) { + raise |= BIT_DZC; + } + if (rc & float_flag_overflow) { + raise |= BIT_OFC; + } + if (rc & float_flag_underflow) { + raise |= BIT_UFC; + } + if (rc & float_flag_inexact) { + raise |= BIT_IXC; + } + + /* Accumulate unenabled exceptions */ + enabled = ts->fpa.fpsr >> 16; + ts->fpa.fpsr |= raise & ~enabled; + + if (raise & enabled) { + target_siginfo_t info = { }; + + /* + * The kernel's nwfpe emulator does not pass a real si_code. + * It merely uses send_sig(SIGFPE, current, 1). + */ + info.si_signo = TARGET_SIGFPE; + info.si_code = TARGET_SI_KERNEL; + + queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); + } else { + env->regs[15] += 4; + } + return true; +} + void cpu_loop(CPUARMState *env) { CPUState *cs = env_cpu(env); @@ -244,9 +302,7 @@ void cpu_loop(CPUARMState *env) case EXCP_NOCP: case EXCP_INVSTATE: { - TaskState *ts = cs->opaque; uint32_t opcode; - int rc; /* we handle the FPU emulation here, as Linux */ /* we get the opcode */ @@ -263,64 +319,15 @@ void cpu_loop(CPUARMState *env) goto excp_debug; } - rc = EmulateAll(opcode, &ts->fpa, env); - if (rc == 0) { /* illegal instruction */ - info.si_signo = TARGET_SIGILL; - info.si_errno = 0; - info.si_code = TARGET_ILL_ILLOPN; - info._sifields._sigfault._addr = env->regs[15]; - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); - } else if (rc < 0) { /* FP exception */ - int arm_fpe=0; - - /* translate softfloat flags to FPSR flags */ - if (-rc & float_flag_invalid) - arm_fpe |= BIT_IOC; - if (-rc & float_flag_divbyzero) - arm_fpe |= BIT_DZC; - if (-rc & float_flag_overflow) - arm_fpe |= BIT_OFC; - if (-rc & float_flag_underflow) - arm_fpe |= BIT_UFC; - if (-rc & float_flag_inexact) - arm_fpe |= BIT_IXC; - - FPSR fpsr = ts->fpa.fpsr; - //printf("fpsr 0x%x, arm_fpe 0x%x\n",fpsr,arm_fpe); - - if (fpsr & (arm_fpe << 16)) { /* exception enabled? */ - info.si_signo = TARGET_SIGFPE; - info.si_errno = 0; - - /* ordered by priority, least first */ - if (arm_fpe & BIT_IXC) info.si_code = TARGET_FPE_FLTRES; - if (arm_fpe & BIT_UFC) info.si_code = TARGET_FPE_FLTUND; - if (arm_fpe & BIT_OFC) info.si_code = TARGET_FPE_FLTOVF; - if (arm_fpe & BIT_DZC) info.si_code = TARGET_FPE_FLTDIV; - if (arm_fpe & BIT_IOC) info.si_code = TARGET_FPE_FLTINV; - - info._sifields._sigfault._addr = env->regs[15]; - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); - } else { - env->regs[15] += 4; - } - - /* accumulate unenabled exceptions */ - if ((!(fpsr & BIT_IXE)) && (arm_fpe & BIT_IXC)) - fpsr |= BIT_IXC; - if ((!(fpsr & BIT_UFE)) && (arm_fpe & BIT_UFC)) - fpsr |= BIT_UFC; - if ((!(fpsr & BIT_OFE)) && (arm_fpe & BIT_OFC)) - fpsr |= BIT_OFC; - if ((!(fpsr & BIT_DZE)) && (arm_fpe & BIT_DZC)) - fpsr |= BIT_DZC; - if ((!(fpsr & BIT_IOE)) && (arm_fpe & BIT_IOC)) - fpsr |= BIT_IOC; - ts->fpa.fpsr=fpsr; - } else { /* everything OK */ - /* increment PC */ - env->regs[15] += 4; + if (!env->thumb && emulate_arm_fpa11(env, opcode)) { + break; } + + info.si_signo = TARGET_SIGILL; + info.si_errno = 0; + info.si_code = TARGET_ILL_ILLOPN; + info._sifields._sigfault._addr = env->regs[15]; + queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); } break; case EXCP_SWI: diff --git a/linux-user/arm/signal.c b/linux-user/arm/signal.c index f21d1535e4..32b68ee302 100644 --- a/linux-user/arm/signal.c +++ b/linux-user/arm/signal.c @@ -685,11 +685,7 @@ static int do_sigframe_return_v2(CPUARMState *env, } } - if (do_sigaltstack(context_addr - + offsetof(struct target_ucontext_v2, tuc_stack), - 0, get_sp_from_cpustate(env)) == -EFAULT) { - return 1; - } + target_restore_altstack(&uc->tuc_stack, env); #if 0 /* Send SIGTRAP if we're single-stepping */ @@ -773,8 +769,7 @@ static long do_rt_sigreturn_v1(CPUARMState *env) goto badframe; } - if (do_sigaltstack(frame_addr + offsetof(struct rt_sigframe_v1, uc.tuc_stack), 0, get_sp_from_cpustate(env)) == -EFAULT) - goto badframe; + target_restore_altstack(&frame->uc.tuc_stack, env); #if 0 /* Send SIGTRAP if we're single-stepping */ |