X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fpowerpc%2Fkernel%2Fsignal_32.c;h=267fc3394018d38e74f2bf5fe4c0a5db1f937946;hb=97bf2856c6014879bd04983a3e9dfcdac1e7fe85;hp=7fb9ff6538bc1dcccda89135b95b0189a34f9ed7;hpb=76828883507a47dae78837ab5dec5a5b4513c667;p=linux-2.6.git diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c index 7fb9ff653..267fc3394 100644 --- a/arch/powerpc/kernel/signal_32.c +++ b/arch/powerpc/kernel/signal_32.c @@ -17,7 +17,6 @@ * 2 of the License, or (at your option) any later version. */ -#include #include #include #include @@ -26,6 +25,7 @@ #include #include #include +#include #ifdef CONFIG_PPC64 #include #include @@ -37,11 +37,12 @@ #include #include #include -#include +#include #endif #include #include +#include #include #include #ifdef CONFIG_PPC64 @@ -418,9 +419,7 @@ static long restore_user_regs(struct pt_regs *regs, { long err; unsigned int save_r2 = 0; -#if defined(CONFIG_ALTIVEC) || defined(CONFIG_SPE) unsigned long msr; -#endif /* * restore general registers but not including MSR or SOFTE. Also @@ -429,11 +428,16 @@ static long restore_user_regs(struct pt_regs *regs, if (!sig) save_r2 = (unsigned int)regs->gpr[2]; err = restore_general_regs(regs, sr); + err |= __get_user(msr, &sr->mc_gregs[PT_MSR]); if (!sig) regs->gpr[2] = (unsigned long) save_r2; if (err) return 1; + /* if doing signal return, restore the previous little-endian mode */ + if (sig) + regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE); + /* * Do this before updating the thread state in * current->thread.fpr/vr/evr. That way, if we get preempted @@ -454,7 +458,7 @@ static long restore_user_regs(struct pt_regs *regs, /* force the process to reload the altivec registers from current->thread when it next does altivec instructions */ regs->msr &= ~MSR_VEC; - if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_VEC) != 0) { + if (msr & MSR_VEC) { /* restore altivec registers from the stack */ if (__copy_from_user(current->thread.vr, &sr->mc_vregs, sizeof(sr->mc_vregs))) @@ -471,7 +475,7 @@ static long restore_user_regs(struct pt_regs *regs, /* force the process to reload the spe registers from current->thread when it next does spe instructions */ regs->msr &= ~MSR_SPE; - if (!__get_user(msr, &sr->mc_gregs[PT_MSR]) && (msr & MSR_SPE) != 0) { + if (msr & MSR_SPE) { /* restore spe registers from the stack */ if (__copy_from_user(current->thread.evr, &sr->mc_vregs, ELF_NEVRREG * sizeof(u32))) @@ -628,6 +632,58 @@ int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s) #define copy_siginfo_to_user copy_siginfo_to_user32 +/* mostly stolen from arch/s390/kernel/compat_signal.c */ +int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) +{ + int err; + u32 tmp; + + if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t))) + return -EFAULT; + + err = __get_user(to->si_signo, &from->si_signo); + err |= __get_user(to->si_errno, &from->si_errno); + err |= __get_user(to->si_code, &from->si_code); + + if (to->si_code < 0) + err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); + else { + switch (to->si_code >> 16) { + case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ + case __SI_MESGQ >> 16: + err |= __get_user(to->si_int, &from->si_int); + /* fallthrough */ + case __SI_KILL >> 16: + err |= __get_user(to->si_pid, &from->si_pid); + err |= __get_user(to->si_uid, &from->si_uid); + break; + case __SI_CHLD >> 16: + err |= __get_user(to->si_pid, &from->si_pid); + err |= __get_user(to->si_uid, &from->si_uid); + err |= __get_user(to->si_utime, &from->si_utime); + err |= __get_user(to->si_stime, &from->si_stime); + err |= __get_user(to->si_status, &from->si_status); + break; + case __SI_FAULT >> 16: + err |= __get_user(tmp, &from->si_addr); + to->si_addr = (void __user *)(u64) tmp; + break; + case __SI_POLL >> 16: + err |= __get_user(to->si_band, &from->si_band); + err |= __get_user(to->si_fd, &from->si_fd); + break; + case __SI_TIMER >> 16: + err |= __get_user(to->si_tid, &from->si_tid); + err |= __get_user(to->si_overrun, &from->si_overrun); + err |= __get_user(to->si_int, &from->si_int); + break; + default: + break; + } + } + return err; +} + /* * Note: it is necessary to treat pid and sig as unsigned ints, with the * corresponding cast to a signed int to insure that the proper conversion @@ -756,10 +812,10 @@ static int handle_rt_signal(unsigned long sig, struct k_sigaction *ka, /* Save user registers on the stack */ frame = &rt_sf->uc.uc_mcontext; - if (vdso32_rt_sigtramp && current->thread.vdso_base) { + if (vdso32_rt_sigtramp && current->mm->context.vdso_base) { if (save_user_regs(regs, frame, 0)) goto badframe; - regs->link = current->thread.vdso_base + vdso32_rt_sigtramp; + regs->link = current->mm->context.vdso_base + vdso32_rt_sigtramp; } else { if (save_user_regs(regs, frame, __NR_rt_sigreturn)) goto badframe; @@ -776,6 +832,8 @@ static int handle_rt_signal(unsigned long sig, struct k_sigaction *ka, regs->gpr[5] = (unsigned long) &rt_sf->uc; regs->gpr[6] = (unsigned long) rt_sf; regs->nip = (unsigned long) ka->sa.sa_handler; + /* enter the signal handler in big-endian mode */ + regs->msr &= ~MSR_LE; regs->trap = 0; return 1; @@ -830,11 +888,21 @@ long sys_swapcontext(struct ucontext __user *old_ctx, return -EINVAL; if (old_ctx != NULL) { + struct mcontext __user *mctx; + + /* + * old_ctx might not be 16-byte aligned, in which + * case old_ctx->uc_mcontext won't be either. + * Because we have the old_ctx->uc_pad2 field + * before old_ctx->uc_mcontext, we need to round down + * from &old_ctx->uc_mcontext to a 16-byte boundary. + */ + mctx = (struct mcontext __user *) + ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL); if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx)) - || save_user_regs(regs, &old_ctx->uc_mcontext, 0) + || save_user_regs(regs, mctx, 0) || put_sigset_t(&old_ctx->uc_sigmask, ¤t->blocked) - || __put_user(to_user_ptr(&old_ctx->uc_mcontext), - &old_ctx->uc_regs)) + || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs)) return -EFAULT; } if (new_ctx == NULL) @@ -1037,10 +1105,10 @@ static int handle_signal(unsigned long sig, struct k_sigaction *ka, || __put_user(sig, &sc->signal)) goto badframe; - if (vdso32_sigtramp && current->thread.vdso_base) { + if (vdso32_sigtramp && current->mm->context.vdso_base) { if (save_user_regs(regs, &frame->mctx, 0)) goto badframe; - regs->link = current->thread.vdso_base + vdso32_sigtramp; + regs->link = current->mm->context.vdso_base + vdso32_sigtramp; } else { if (save_user_regs(regs, &frame->mctx, __NR_sigreturn)) goto badframe; @@ -1055,6 +1123,8 @@ static int handle_signal(unsigned long sig, struct k_sigaction *ka, regs->gpr[3] = sig; regs->gpr[4] = (unsigned long) sc; regs->nip = (unsigned long) ka->sa.sa_handler; + /* enter the signal handler in big-endian mode */ + regs->msr &= ~MSR_LE; regs->trap = 0; return 1; @@ -1209,6 +1279,8 @@ no_signal: its frame, and we can clear the TIF_RESTORE_SIGMASK flag */ if (test_thread_flag(TIF_RESTORE_SIGMASK)) clear_thread_flag(TIF_RESTORE_SIGMASK); + + tracehook_report_handle_signal(signr, &ka, oldset, regs); } return ret;