Message ID | 20200114210921.11216-3-richard.henderson@linaro.org |
---|---|
State | New |
Headers | show |
Series | linux-user: Implement x86_64 vsyscalls | expand |
On 1/14/20 10:09 PM, Richard Henderson wrote: > This is a bit tidier than open-coding the 5 lines necessary > to initialize the target_siginfo_t. In addition, this zeros > the remaining bytes of the target_siginfo_t, rather than > passing in garbage. > > Signed-off-by: Richard Henderson <richard.henderson@linaro.org> > --- > linux-user/i386/cpu_loop.c | 93 ++++++++++++++------------------------ > 1 file changed, 33 insertions(+), 60 deletions(-) > > diff --git a/linux-user/i386/cpu_loop.c b/linux-user/i386/cpu_loop.c > index 024b6f4d58..e217cca5ee 100644 > --- a/linux-user/i386/cpu_loop.c > +++ b/linux-user/i386/cpu_loop.c > @@ -81,13 +81,23 @@ static void set_idt(int n, unsigned int dpl) > } > #endif > > +static void gen_signal(CPUX86State *env, int sig, int code, abi_ptr addr) > +{ > + target_siginfo_t info = { > + .si_signo = sig, > + .si_code = code, > + ._sifields._sigfault._addr = addr > + }; > + > + queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); > +} > + > void cpu_loop(CPUX86State *env) > { > CPUState *cs = env_cpu(env); > int trapnr; > abi_ulong pc; > abi_ulong ret; > - target_siginfo_t info; > > for(;;) { > cpu_exec_start(cs); > @@ -134,70 +144,45 @@ void cpu_loop(CPUX86State *env) > #endif > case EXCP0B_NOSEG: > case EXCP0C_STACK: > - info.si_signo = TARGET_SIGBUS; > - info.si_errno = 0; > - info.si_code = TARGET_SI_KERNEL; > - info._sifields._sigfault._addr = 0; > - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); > + gen_signal(env, TARGET_SIGBUS, TARGET_SI_KERNEL, 0); > break; > case EXCP0D_GPF: > /* XXX: potential problem if ABI32 */ > #ifndef TARGET_X86_64 > if (env->eflags & VM_MASK) { > handle_vm86_fault(env); > - } else > -#endif > - { > - info.si_signo = TARGET_SIGSEGV; > - info.si_errno = 0; > - info.si_code = TARGET_SI_KERNEL; > - info._sifields._sigfault._addr = 0; > - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); > + break; > } > +#endif > + gen_signal(env, TARGET_SIGSEGV, TARGET_SI_KERNEL, 0); > break; > case EXCP0E_PAGE: > - info.si_signo = TARGET_SIGSEGV; > - info.si_errno = 0; > - if (!(env->error_code & 1)) > - info.si_code = TARGET_SEGV_MAPERR; > - else > - info.si_code = TARGET_SEGV_ACCERR; > - info._sifields._sigfault._addr = env->cr[2]; > - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); > + gen_signal(env, TARGET_SIGSEGV, > + (env->error_code & 1 ? > + TARGET_SEGV_ACCERR : TARGET_SEGV_MAPERR), > + env->cr[2]); > break; > case EXCP00_DIVZ: > #ifndef TARGET_X86_64 > if (env->eflags & VM_MASK) { > handle_vm86_trap(env, trapnr); > - } else > -#endif > - { > - /* division by zero */ > - info.si_signo = TARGET_SIGFPE; > - info.si_errno = 0; > - info.si_code = TARGET_FPE_INTDIV; > - info._sifields._sigfault._addr = env->eip; > - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); > + break; > } > +#endif > + gen_signal(env, TARGET_SIGFPE, TARGET_FPE_INTDIV, env->eip); > break; > case EXCP01_DB: > case EXCP03_INT3: > #ifndef TARGET_X86_64 > if (env->eflags & VM_MASK) { > handle_vm86_trap(env, trapnr); > - } else > + break; > + } > #endif > - { > - info.si_signo = TARGET_SIGTRAP; > - info.si_errno = 0; > - if (trapnr == EXCP01_DB) { > - info.si_code = TARGET_TRAP_BRKPT; > - info._sifields._sigfault._addr = env->eip; > - } else { > - info.si_code = TARGET_SI_KERNEL; > - info._sifields._sigfault._addr = 0; > - } > - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); > + if (trapnr == EXCP01_DB) { > + gen_signal(env, TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->eip); > + } else { > + gen_signal(env, TARGET_SIGTRAP, TARGET_SI_KERNEL, 0); > } > break; > case EXCP04_INTO: > @@ -205,31 +190,19 @@ void cpu_loop(CPUX86State *env) > #ifndef TARGET_X86_64 > if (env->eflags & VM_MASK) { > handle_vm86_trap(env, trapnr); > - } else > -#endif > - { > - info.si_signo = TARGET_SIGSEGV; > - info.si_errno = 0; > - info.si_code = TARGET_SI_KERNEL; > - info._sifields._sigfault._addr = 0; > - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); > + break; > } > +#endif > + gen_signal(env, TARGET_SIGSEGV, TARGET_SI_KERNEL, 0); > break; > case EXCP06_ILLOP: > - info.si_signo = TARGET_SIGILL; > - info.si_errno = 0; > - info.si_code = TARGET_ILL_ILLOPN; > - info._sifields._sigfault._addr = env->eip; > - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); > + gen_signal(env, TARGET_SIGILL, TARGET_ILL_ILLOPN, env->eip); > break; > case EXCP_INTERRUPT: > /* just indicate that signals should be handled asap */ > break; > case EXCP_DEBUG: > - 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); > + gen_signal(env, TARGET_SIGTRAP, TARGET_TRAP_BRKPT, 0); > break; > case EXCP_ATOMIC: > cpu_exec_step_atomic(cs); > Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Richard Henderson <richard.henderson@linaro.org> writes: > This is a bit tidier than open-coding the 5 lines necessary > to initialize the target_siginfo_t. In addition, this zeros > the remaining bytes of the target_siginfo_t, rather than > passing in garbage. > > Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> > --- > linux-user/i386/cpu_loop.c | 93 ++++++++++++++------------------------ > 1 file changed, 33 insertions(+), 60 deletions(-) > > diff --git a/linux-user/i386/cpu_loop.c b/linux-user/i386/cpu_loop.c > index 024b6f4d58..e217cca5ee 100644 > --- a/linux-user/i386/cpu_loop.c > +++ b/linux-user/i386/cpu_loop.c > @@ -81,13 +81,23 @@ static void set_idt(int n, unsigned int dpl) > } > #endif > > +static void gen_signal(CPUX86State *env, int sig, int code, abi_ptr addr) > +{ > + target_siginfo_t info = { > + .si_signo = sig, > + .si_code = code, > + ._sifields._sigfault._addr = addr > + }; > + > + queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); > +} > + > void cpu_loop(CPUX86State *env) > { > CPUState *cs = env_cpu(env); > int trapnr; > abi_ulong pc; > abi_ulong ret; > - target_siginfo_t info; > > for(;;) { > cpu_exec_start(cs); > @@ -134,70 +144,45 @@ void cpu_loop(CPUX86State *env) > #endif > case EXCP0B_NOSEG: > case EXCP0C_STACK: > - info.si_signo = TARGET_SIGBUS; > - info.si_errno = 0; > - info.si_code = TARGET_SI_KERNEL; > - info._sifields._sigfault._addr = 0; > - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); > + gen_signal(env, TARGET_SIGBUS, TARGET_SI_KERNEL, 0); > break; > case EXCP0D_GPF: > /* XXX: potential problem if ABI32 */ > #ifndef TARGET_X86_64 > if (env->eflags & VM_MASK) { > handle_vm86_fault(env); > - } else > -#endif > - { > - info.si_signo = TARGET_SIGSEGV; > - info.si_errno = 0; > - info.si_code = TARGET_SI_KERNEL; > - info._sifields._sigfault._addr = 0; > - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); > + break; > } > +#endif > + gen_signal(env, TARGET_SIGSEGV, TARGET_SI_KERNEL, 0); > break; > case EXCP0E_PAGE: > - info.si_signo = TARGET_SIGSEGV; > - info.si_errno = 0; > - if (!(env->error_code & 1)) > - info.si_code = TARGET_SEGV_MAPERR; > - else > - info.si_code = TARGET_SEGV_ACCERR; > - info._sifields._sigfault._addr = env->cr[2]; > - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); > + gen_signal(env, TARGET_SIGSEGV, > + (env->error_code & 1 ? > + TARGET_SEGV_ACCERR : TARGET_SEGV_MAPERR), > + env->cr[2]); > break; > case EXCP00_DIVZ: > #ifndef TARGET_X86_64 > if (env->eflags & VM_MASK) { > handle_vm86_trap(env, trapnr); > - } else > -#endif > - { > - /* division by zero */ > - info.si_signo = TARGET_SIGFPE; > - info.si_errno = 0; > - info.si_code = TARGET_FPE_INTDIV; > - info._sifields._sigfault._addr = env->eip; > - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); > + break; > } > +#endif > + gen_signal(env, TARGET_SIGFPE, TARGET_FPE_INTDIV, env->eip); > break; > case EXCP01_DB: > case EXCP03_INT3: > #ifndef TARGET_X86_64 > if (env->eflags & VM_MASK) { > handle_vm86_trap(env, trapnr); > - } else > + break; > + } > #endif > - { > - info.si_signo = TARGET_SIGTRAP; > - info.si_errno = 0; > - if (trapnr == EXCP01_DB) { > - info.si_code = TARGET_TRAP_BRKPT; > - info._sifields._sigfault._addr = env->eip; > - } else { > - info.si_code = TARGET_SI_KERNEL; > - info._sifields._sigfault._addr = 0; > - } > - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); > + if (trapnr == EXCP01_DB) { > + gen_signal(env, TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->eip); > + } else { > + gen_signal(env, TARGET_SIGTRAP, TARGET_SI_KERNEL, 0); > } > break; > case EXCP04_INTO: > @@ -205,31 +190,19 @@ void cpu_loop(CPUX86State *env) > #ifndef TARGET_X86_64 > if (env->eflags & VM_MASK) { > handle_vm86_trap(env, trapnr); > - } else > -#endif > - { > - info.si_signo = TARGET_SIGSEGV; > - info.si_errno = 0; > - info.si_code = TARGET_SI_KERNEL; > - info._sifields._sigfault._addr = 0; > - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); > + break; > } > +#endif > + gen_signal(env, TARGET_SIGSEGV, TARGET_SI_KERNEL, 0); > break; > case EXCP06_ILLOP: > - info.si_signo = TARGET_SIGILL; > - info.si_errno = 0; > - info.si_code = TARGET_ILL_ILLOPN; > - info._sifields._sigfault._addr = env->eip; > - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); > + gen_signal(env, TARGET_SIGILL, TARGET_ILL_ILLOPN, env->eip); > break; > case EXCP_INTERRUPT: > /* just indicate that signals should be handled asap */ > break; > case EXCP_DEBUG: > - 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); > + gen_signal(env, TARGET_SIGTRAP, TARGET_TRAP_BRKPT, 0); > break; > case EXCP_ATOMIC: > cpu_exec_step_atomic(cs);
diff --git a/linux-user/i386/cpu_loop.c b/linux-user/i386/cpu_loop.c index 024b6f4d58..e217cca5ee 100644 --- a/linux-user/i386/cpu_loop.c +++ b/linux-user/i386/cpu_loop.c @@ -81,13 +81,23 @@ static void set_idt(int n, unsigned int dpl) } #endif +static void gen_signal(CPUX86State *env, int sig, int code, abi_ptr addr) +{ + target_siginfo_t info = { + .si_signo = sig, + .si_code = code, + ._sifields._sigfault._addr = addr + }; + + queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); +} + void cpu_loop(CPUX86State *env) { CPUState *cs = env_cpu(env); int trapnr; abi_ulong pc; abi_ulong ret; - target_siginfo_t info; for(;;) { cpu_exec_start(cs); @@ -134,70 +144,45 @@ void cpu_loop(CPUX86State *env) #endif case EXCP0B_NOSEG: case EXCP0C_STACK: - info.si_signo = TARGET_SIGBUS; - info.si_errno = 0; - info.si_code = TARGET_SI_KERNEL; - info._sifields._sigfault._addr = 0; - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); + gen_signal(env, TARGET_SIGBUS, TARGET_SI_KERNEL, 0); break; case EXCP0D_GPF: /* XXX: potential problem if ABI32 */ #ifndef TARGET_X86_64 if (env->eflags & VM_MASK) { handle_vm86_fault(env); - } else -#endif - { - info.si_signo = TARGET_SIGSEGV; - info.si_errno = 0; - info.si_code = TARGET_SI_KERNEL; - info._sifields._sigfault._addr = 0; - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); + break; } +#endif + gen_signal(env, TARGET_SIGSEGV, TARGET_SI_KERNEL, 0); break; case EXCP0E_PAGE: - info.si_signo = TARGET_SIGSEGV; - info.si_errno = 0; - if (!(env->error_code & 1)) - info.si_code = TARGET_SEGV_MAPERR; - else - info.si_code = TARGET_SEGV_ACCERR; - info._sifields._sigfault._addr = env->cr[2]; - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); + gen_signal(env, TARGET_SIGSEGV, + (env->error_code & 1 ? + TARGET_SEGV_ACCERR : TARGET_SEGV_MAPERR), + env->cr[2]); break; case EXCP00_DIVZ: #ifndef TARGET_X86_64 if (env->eflags & VM_MASK) { handle_vm86_trap(env, trapnr); - } else -#endif - { - /* division by zero */ - info.si_signo = TARGET_SIGFPE; - info.si_errno = 0; - info.si_code = TARGET_FPE_INTDIV; - info._sifields._sigfault._addr = env->eip; - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); + break; } +#endif + gen_signal(env, TARGET_SIGFPE, TARGET_FPE_INTDIV, env->eip); break; case EXCP01_DB: case EXCP03_INT3: #ifndef TARGET_X86_64 if (env->eflags & VM_MASK) { handle_vm86_trap(env, trapnr); - } else + break; + } #endif - { - info.si_signo = TARGET_SIGTRAP; - info.si_errno = 0; - if (trapnr == EXCP01_DB) { - info.si_code = TARGET_TRAP_BRKPT; - info._sifields._sigfault._addr = env->eip; - } else { - info.si_code = TARGET_SI_KERNEL; - info._sifields._sigfault._addr = 0; - } - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); + if (trapnr == EXCP01_DB) { + gen_signal(env, TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->eip); + } else { + gen_signal(env, TARGET_SIGTRAP, TARGET_SI_KERNEL, 0); } break; case EXCP04_INTO: @@ -205,31 +190,19 @@ void cpu_loop(CPUX86State *env) #ifndef TARGET_X86_64 if (env->eflags & VM_MASK) { handle_vm86_trap(env, trapnr); - } else -#endif - { - info.si_signo = TARGET_SIGSEGV; - info.si_errno = 0; - info.si_code = TARGET_SI_KERNEL; - info._sifields._sigfault._addr = 0; - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); + break; } +#endif + gen_signal(env, TARGET_SIGSEGV, TARGET_SI_KERNEL, 0); break; case EXCP06_ILLOP: - info.si_signo = TARGET_SIGILL; - info.si_errno = 0; - info.si_code = TARGET_ILL_ILLOPN; - info._sifields._sigfault._addr = env->eip; - queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); + gen_signal(env, TARGET_SIGILL, TARGET_ILL_ILLOPN, env->eip); break; case EXCP_INTERRUPT: /* just indicate that signals should be handled asap */ break; case EXCP_DEBUG: - 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); + gen_signal(env, TARGET_SIGTRAP, TARGET_TRAP_BRKPT, 0); break; case EXCP_ATOMIC: cpu_exec_step_atomic(cs);
This is a bit tidier than open-coding the 5 lines necessary to initialize the target_siginfo_t. In addition, this zeros the remaining bytes of the target_siginfo_t, rather than passing in garbage. Signed-off-by: Richard Henderson <richard.henderson@linaro.org> --- linux-user/i386/cpu_loop.c | 93 ++++++++++++++------------------------ 1 file changed, 33 insertions(+), 60 deletions(-)