diff options
| -rw-r--r-- | linux-user/mips/signal.c | 382 | ||||
| -rw-r--r-- | linux-user/mips/target_signal.h | 9 | ||||
| -rw-r--r-- | linux-user/mips64/signal.c | 2 | ||||
| -rw-r--r-- | linux-user/mips64/target_signal.h | 4 | ||||
| -rw-r--r-- | linux-user/signal.c | 381 |
5 files changed, 396 insertions, 382 deletions
diff --git a/linux-user/mips/signal.c b/linux-user/mips/signal.c index 02ca338b6c..adeb5a4241 100644 --- a/linux-user/mips/signal.c +++ b/linux-user/mips/signal.c @@ -16,3 +16,385 @@ * You should have received a copy of the GNU General Public License * along with this program; if not, see <http://www.gnu.org/licenses/>. */ +#include "qemu/osdep.h" +#include "qemu.h" +#include "target_signal.h" +#include "signal-common.h" +#include "linux-user/trace.h" + +# if defined(TARGET_ABI_MIPSO32) +struct target_sigcontext { + uint32_t sc_regmask; /* Unused */ + uint32_t sc_status; + uint64_t sc_pc; + uint64_t sc_regs[32]; + uint64_t sc_fpregs[32]; + uint32_t sc_ownedfp; /* Unused */ + uint32_t sc_fpc_csr; + uint32_t sc_fpc_eir; /* Unused */ + uint32_t sc_used_math; + uint32_t sc_dsp; /* dsp status, was sc_ssflags */ + uint32_t pad0; + uint64_t sc_mdhi; + uint64_t sc_mdlo; + target_ulong sc_hi1; /* Was sc_cause */ + target_ulong sc_lo1; /* Was sc_badvaddr */ + target_ulong sc_hi2; /* Was sc_sigset[4] */ + target_ulong sc_lo2; + target_ulong sc_hi3; + target_ulong sc_lo3; +}; +# else /* N32 || N64 */ +struct target_sigcontext { + uint64_t sc_regs[32]; + uint64_t sc_fpregs[32]; + uint64_t sc_mdhi; + uint64_t sc_hi1; + uint64_t sc_hi2; + uint64_t sc_hi3; + uint64_t sc_mdlo; + uint64_t sc_lo1; + uint64_t sc_lo2; + uint64_t sc_lo3; + uint64_t sc_pc; + uint32_t sc_fpc_csr; + uint32_t sc_used_math; + uint32_t sc_dsp; + uint32_t sc_reserved; +}; +# endif /* O32 */ + +struct sigframe { + uint32_t sf_ass[4]; /* argument save space for o32 */ + uint32_t sf_code[2]; /* signal trampoline */ + struct target_sigcontext sf_sc; + target_sigset_t sf_mask; +}; + +struct target_ucontext { + target_ulong tuc_flags; + target_ulong tuc_link; + target_stack_t tuc_stack; + target_ulong pad0; + struct target_sigcontext tuc_mcontext; + target_sigset_t tuc_sigmask; +}; + +struct target_rt_sigframe { + uint32_t rs_ass[4]; /* argument save space for o32 */ + uint32_t rs_code[2]; /* signal trampoline */ + struct target_siginfo rs_info; + struct target_ucontext rs_uc; +}; + +/* Install trampoline to jump back from signal handler */ +static inline int install_sigtramp(unsigned int *tramp, unsigned int syscall) +{ + int err = 0; + + /* + * Set up the return code ... + * + * li v0, __NR__foo_sigreturn + * syscall + */ + + __put_user(0x24020000 + syscall, tramp + 0); + __put_user(0x0000000c , tramp + 1); + return err; +} + +static inline void setup_sigcontext(CPUMIPSState *regs, + struct target_sigcontext *sc) +{ + int i; + + __put_user(exception_resume_pc(regs), &sc->sc_pc); + regs->hflags &= ~MIPS_HFLAG_BMASK; + + __put_user(0, &sc->sc_regs[0]); + for (i = 1; i < 32; ++i) { + __put_user(regs->active_tc.gpr[i], &sc->sc_regs[i]); + } + + __put_user(regs->active_tc.HI[0], &sc->sc_mdhi); + __put_user(regs->active_tc.LO[0], &sc->sc_mdlo); + + /* Rather than checking for dsp existence, always copy. The storage + would just be garbage otherwise. */ + __put_user(regs->active_tc.HI[1], &sc->sc_hi1); + __put_user(regs->active_tc.HI[2], &sc->sc_hi2); + __put_user(regs->active_tc.HI[3], &sc->sc_hi3); + __put_user(regs->active_tc.LO[1], &sc->sc_lo1); + __put_user(regs->active_tc.LO[2], &sc->sc_lo2); + __put_user(regs->active_tc.LO[3], &sc->sc_lo3); + { + uint32_t dsp = cpu_rddsp(0x3ff, regs); + __put_user(dsp, &sc->sc_dsp); + } + + __put_user(1, &sc->sc_used_math); + + for (i = 0; i < 32; ++i) { + __put_user(regs->active_fpu.fpr[i].d, &sc->sc_fpregs[i]); + } +} + +static inline void +restore_sigcontext(CPUMIPSState *regs, struct target_sigcontext *sc) +{ + int i; + + __get_user(regs->CP0_EPC, &sc->sc_pc); + + __get_user(regs->active_tc.HI[0], &sc->sc_mdhi); + __get_user(regs->active_tc.LO[0], &sc->sc_mdlo); + + for (i = 1; i < 32; ++i) { + __get_user(regs->active_tc.gpr[i], &sc->sc_regs[i]); + } + + __get_user(regs->active_tc.HI[1], &sc->sc_hi1); + __get_user(regs->active_tc.HI[2], &sc->sc_hi2); + __get_user(regs->active_tc.HI[3], &sc->sc_hi3); + __get_user(regs->active_tc.LO[1], &sc->sc_lo1); + __get_user(regs->active_tc.LO[2], &sc->sc_lo2); + __get_user(regs->active_tc.LO[3], &sc->sc_lo3); + { + uint32_t dsp; + __get_user(dsp, &sc->sc_dsp); + cpu_wrdsp(dsp, 0x3ff, regs); + } + + for (i = 0; i < 32; ++i) { + __get_user(regs->active_fpu.fpr[i].d, &sc->sc_fpregs[i]); + } +} + +/* + * Determine which stack to use.. + */ +static inline abi_ulong +get_sigframe(struct target_sigaction *ka, CPUMIPSState *regs, size_t frame_size) +{ + unsigned long sp; + + /* Default to using normal stack */ + sp = regs->active_tc.gpr[29]; + + /* + * FPU emulator may have its own trampoline active just + * above the user stack, 16-bytes before the next lowest + * 16 byte boundary. Try to avoid trashing it. + */ + sp -= 32; + + /* This is the X/Open sanctioned signal stack switching. */ + if ((ka->sa_flags & TARGET_SA_ONSTACK) && (sas_ss_flags (sp) == 0)) { + sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size; + } + + return (sp - frame_size) & ~7; +} + +static void mips_set_hflags_isa_mode_from_pc(CPUMIPSState *env) +{ + if (env->insn_flags & (ASE_MIPS16 | ASE_MICROMIPS)) { + env->hflags &= ~MIPS_HFLAG_M16; + env->hflags |= (env->active_tc.PC & 1) << MIPS_HFLAG_M16_SHIFT; + env->active_tc.PC &= ~(target_ulong) 1; + } +} + +# if defined(TARGET_ABI_MIPSO32) +/* compare linux/arch/mips/kernel/signal.c:setup_frame() */ +void setup_frame(int sig, struct target_sigaction * ka, + target_sigset_t *set, CPUMIPSState *regs) +{ + struct sigframe *frame; + abi_ulong frame_addr; + int i; + + frame_addr = get_sigframe(ka, regs, sizeof(*frame)); + trace_user_setup_frame(regs, frame_addr); + if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { + goto give_sigsegv; + } + + install_sigtramp(frame->sf_code, TARGET_NR_sigreturn); + + setup_sigcontext(regs, &frame->sf_sc); + + for(i = 0; i < TARGET_NSIG_WORDS; i++) { + __put_user(set->sig[i], &frame->sf_mask.sig[i]); + } + + /* + * Arguments to signal handler: + * + * a0 = signal number + * a1 = 0 (should be cause) + * a2 = pointer to struct sigcontext + * + * $25 and PC point to the signal handler, $29 points to the + * struct sigframe. + */ + regs->active_tc.gpr[ 4] = sig; + regs->active_tc.gpr[ 5] = 0; + regs->active_tc.gpr[ 6] = frame_addr + offsetof(struct sigframe, sf_sc); + regs->active_tc.gpr[29] = frame_addr; + regs->active_tc.gpr[31] = frame_addr + offsetof(struct sigframe, sf_code); + /* The original kernel code sets CP0_EPC to the handler + * since it returns to userland using eret + * we cannot do this here, and we must set PC directly */ + regs->active_tc.PC = regs->active_tc.gpr[25] = ka->_sa_handler; + mips_set_hflags_isa_mode_from_pc(regs); + unlock_user_struct(frame, frame_addr, 1); + return; + +give_sigsegv: + force_sigsegv(sig); +} + +long do_sigreturn(CPUMIPSState *regs) +{ + struct sigframe *frame; + abi_ulong frame_addr; + sigset_t blocked; + target_sigset_t target_set; + int i; + + frame_addr = regs->active_tc.gpr[29]; + trace_user_do_sigreturn(regs, frame_addr); + if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) + goto badframe; + + for(i = 0; i < TARGET_NSIG_WORDS; i++) { + __get_user(target_set.sig[i], &frame->sf_mask.sig[i]); + } + + target_to_host_sigset_internal(&blocked, &target_set); + set_sigmask(&blocked); + + restore_sigcontext(regs, &frame->sf_sc); + +#if 0 + /* + * Don't let your children do this ... + */ + __asm__ __volatile__( + "move\t$29, %0\n\t" + "j\tsyscall_exit" + :/* no outputs */ + :"r" (®s)); + /* Unreached */ +#endif + + regs->active_tc.PC = regs->CP0_EPC; + mips_set_hflags_isa_mode_from_pc(regs); + /* I am not sure this is right, but it seems to work + * maybe a problem with nested signals ? */ + regs->CP0_EPC = 0; + return -TARGET_QEMU_ESIGRETURN; + +badframe: + force_sig(TARGET_SIGSEGV); + return -TARGET_QEMU_ESIGRETURN; +} +# endif /* O32 */ + +void setup_rt_frame(int sig, struct target_sigaction *ka, + target_siginfo_t *info, + target_sigset_t *set, CPUMIPSState *env) +{ + struct target_rt_sigframe *frame; + abi_ulong frame_addr; + int i; + + frame_addr = get_sigframe(ka, env, sizeof(*frame)); + trace_user_setup_rt_frame(env, frame_addr); + if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { + goto give_sigsegv; + } + + install_sigtramp(frame->rs_code, TARGET_NR_rt_sigreturn); + + tswap_siginfo(&frame->rs_info, info); + + __put_user(0, &frame->rs_uc.tuc_flags); + __put_user(0, &frame->rs_uc.tuc_link); + __put_user(target_sigaltstack_used.ss_sp, &frame->rs_uc.tuc_stack.ss_sp); + __put_user(target_sigaltstack_used.ss_size, &frame->rs_uc.tuc_stack.ss_size); + __put_user(sas_ss_flags(get_sp_from_cpustate(env)), + &frame->rs_uc.tuc_stack.ss_flags); + + setup_sigcontext(env, &frame->rs_uc.tuc_mcontext); + + for(i = 0; i < TARGET_NSIG_WORDS; i++) { + __put_user(set->sig[i], &frame->rs_uc.tuc_sigmask.sig[i]); + } + + /* + * Arguments to signal handler: + * + * a0 = signal number + * a1 = pointer to siginfo_t + * a2 = pointer to ucontext_t + * + * $25 and PC point to the signal handler, $29 points to the + * struct sigframe. + */ + env->active_tc.gpr[ 4] = sig; + env->active_tc.gpr[ 5] = frame_addr + + offsetof(struct target_rt_sigframe, rs_info); + env->active_tc.gpr[ 6] = frame_addr + + offsetof(struct target_rt_sigframe, rs_uc); + env->active_tc.gpr[29] = frame_addr; + env->active_tc.gpr[31] = frame_addr + + offsetof(struct target_rt_sigframe, rs_code); + /* The original kernel code sets CP0_EPC to the handler + * since it returns to userland using eret + * we cannot do this here, and we must set PC directly */ + env->active_tc.PC = env->active_tc.gpr[25] = ka->_sa_handler; + mips_set_hflags_isa_mode_from_pc(env); + unlock_user_struct(frame, frame_addr, 1); + return; + +give_sigsegv: + unlock_user_struct(frame, frame_addr, 1); + force_sigsegv(sig); +} + +long do_rt_sigreturn(CPUMIPSState *env) +{ + struct target_rt_sigframe *frame; + abi_ulong frame_addr; + sigset_t blocked; + + frame_addr = env->active_tc.gpr[29]; + trace_user_do_rt_sigreturn(env, frame_addr); + if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { + goto badframe; + } + + target_to_host_sigset(&blocked, &frame->rs_uc.tuc_sigmask); + set_sigmask(&blocked); + + restore_sigcontext(env, &frame->rs_uc.tuc_mcontext); + + if (do_sigaltstack(frame_addr + + offsetof(struct target_rt_sigframe, rs_uc.tuc_stack), + 0, get_sp_from_cpustate(env)) == -EFAULT) + goto badframe; + + env->active_tc.PC = env->CP0_EPC; + mips_set_hflags_isa_mode_from_pc(env); + /* I am not sure this is right, but it seems to work + * maybe a problem with nested signals ? */ + env->CP0_EPC = 0; + return -TARGET_QEMU_ESIGRETURN; + +badframe: + force_sig(TARGET_SIGSEGV); + return -TARGET_QEMU_ESIGRETURN; +} diff --git a/linux-user/mips/target_signal.h b/linux-user/mips/target_signal.h index 8dd27cef35..22ab3e4a94 100644 --- a/linux-user/mips/target_signal.h +++ b/linux-user/mips/target_signal.h @@ -26,5 +26,12 @@ static inline abi_ulong get_sp_from_cpustate(CPUMIPSState *state) return state->active_tc.gpr[29]; } - +# if defined(TARGET_ABI_MIPSO32) +/* compare linux/arch/mips/kernel/signal.c:setup_frame() */ +void setup_frame(int sig, struct target_sigaction * ka, + target_sigset_t *set, CPUMIPSState *regs); +#endif +void setup_rt_frame(int sig, struct target_sigaction *ka, + target_siginfo_t *info, + target_sigset_t *set, CPUMIPSState *env); #endif /* MIPS_TARGET_SIGNAL_H */ diff --git a/linux-user/mips64/signal.c b/linux-user/mips64/signal.c index 02ca338b6c..4ed0ed90b3 100644 --- a/linux-user/mips64/signal.c +++ b/linux-user/mips64/signal.c @@ -16,3 +16,5 @@ * You should have received a copy of the GNU General Public License * along with this program; if not, see <http://www.gnu.org/licenses/>. */ +#define MIPS_TARGET_SIGNAL_H /* to only include mips64/target_signal.h */ +#include "../mips/signal.c" diff --git a/linux-user/mips64/target_signal.h b/linux-user/mips64/target_signal.h index 67ef5a18f4..70dfe40978 100644 --- a/linux-user/mips64/target_signal.h +++ b/linux-user/mips64/target_signal.h @@ -26,5 +26,7 @@ static inline abi_ulong get_sp_from_cpustate(CPUMIPSState *state) return state->active_tc.gpr[29]; } - +void setup_rt_frame(int sig, struct target_sigaction *ka, + target_siginfo_t *info, + target_sigset_t *set, CPUMIPSState *env); #endif /* MIPS64_TARGET_SIGNAL_H */ diff --git a/linux-user/signal.c b/linux-user/signal.c index 27c3769c5e..18acf6a4b0 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -803,386 +803,7 @@ int do_sigaction(int sig, const struct target_sigaction *act, return ret; } -#if defined(TARGET_MIPS) || defined(TARGET_MIPS64) - -# if defined(TARGET_ABI_MIPSO32) -struct target_sigcontext { - uint32_t sc_regmask; /* Unused */ - uint32_t sc_status; - uint64_t sc_pc; - uint64_t sc_regs[32]; - uint64_t sc_fpregs[32]; - uint32_t sc_ownedfp; /* Unused */ - uint32_t sc_fpc_csr; - uint32_t sc_fpc_eir; /* Unused */ - uint32_t sc_used_math; - uint32_t sc_dsp; /* dsp status, was sc_ssflags */ - uint32_t pad0; - uint64_t sc_mdhi; - uint64_t sc_mdlo; - target_ulong sc_hi1; /* Was sc_cause */ - target_ulong sc_lo1; /* Was sc_badvaddr */ - target_ulong sc_hi2; /* Was sc_sigset[4] */ - target_ulong sc_lo2; - target_ulong sc_hi3; - target_ulong sc_lo3; -}; -# else /* N32 || N64 */ -struct target_sigcontext { - uint64_t sc_regs[32]; - uint64_t sc_fpregs[32]; - uint64_t sc_mdhi; - uint64_t sc_hi1; - uint64_t sc_hi2; - uint64_t sc_hi3; - uint64_t sc_mdlo; - uint64_t sc_lo1; - uint64_t sc_lo2; - uint64_t sc_lo3; - uint64_t sc_pc; - uint32_t sc_fpc_csr; - uint32_t sc_used_math; - uint32_t sc_dsp; - uint32_t sc_reserved; -}; -# endif /* O32 */ - -struct sigframe { - uint32_t sf_ass[4]; /* argument save space for o32 */ - uint32_t sf_code[2]; /* signal trampoline */ - struct target_sigcontext sf_sc; - target_sigset_t sf_mask; -}; - -struct target_ucontext { - target_ulong tuc_flags; - target_ulong tuc_link; - target_stack_t tuc_stack; - target_ulong pad0; - struct target_sigcontext tuc_mcontext; - target_sigset_t tuc_sigmask; -}; - -struct target_rt_sigframe { - uint32_t rs_ass[4]; /* argument save space for o32 */ - uint32_t rs_code[2]; /* signal trampoline */ - struct target_siginfo rs_info; - struct target_ucontext rs_uc; -}; - -/* Install trampoline to jump back from signal handler */ -static inline int install_sigtramp(unsigned int *tramp, unsigned int syscall) -{ - int err = 0; - - /* - * Set up the return code ... - * - * li v0, __NR__foo_sigreturn - * syscall - */ - - __put_user(0x24020000 + syscall, tramp + 0); - __put_user(0x0000000c , tramp + 1); - return err; -} - -static inline void setup_sigcontext(CPUMIPSState *regs, - struct target_sigcontext *sc) -{ - int i; - - __put_user(exception_resume_pc(regs), &sc->sc_pc); - regs->hflags &= ~MIPS_HFLAG_BMASK; - - __put_user(0, &sc->sc_regs[0]); - for (i = 1; i < 32; ++i) { - __put_user(regs->active_tc.gpr[i], &sc->sc_regs[i]); - } - - __put_user(regs->active_tc.HI[0], &sc->sc_mdhi); - __put_user(regs->active_tc.LO[0], &sc->sc_mdlo); - - /* Rather than checking for dsp existence, always copy. The storage - would just be garbage otherwise. */ - __put_user(regs->active_tc.HI[1], &sc->sc_hi1); - __put_user(regs->active_tc.HI[2], &sc->sc_hi2); - __put_user(regs->active_tc.HI[3], &sc->sc_hi3); - __put_user(regs->active_tc.LO[1], &sc->sc_lo1); - __put_user(regs->active_tc.LO[2], &sc->sc_lo2); - __put_user(regs->active_tc.LO[3], &sc->sc_lo3); - { - uint32_t dsp = cpu_rddsp(0x3ff, regs); - __put_user(dsp, &sc->sc_dsp); - } - - __put_user(1, &sc->sc_used_math); - - for (i = 0; i < 32; ++i) { - __put_user(regs->active_fpu.fpr[i].d, &sc->sc_fpregs[i]); - } -} - -static inline void -restore_sigcontext(CPUMIPSState *regs, struct target_sigcontext *sc) -{ - int i; - - __get_user(regs->CP0_EPC, &sc->sc_pc); - - __get_user(regs->active_tc.HI[0], &sc->sc_mdhi); - __get_user(regs->active_tc.LO[0], &sc->sc_mdlo); - - for (i = 1; i < 32; ++i) { - __get_user(regs->active_tc.gpr[i], &sc->sc_regs[i]); - } - - __get_user(regs->active_tc.HI[1], &sc->sc_hi1); - __get_user(regs->active_tc.HI[2], &sc->sc_hi2); - __get_user(regs->active_tc.HI[3], &sc->sc_hi3); - __get_user(regs->active_tc.LO[1], &sc->sc_lo1); - __get_user(regs->active_tc.LO[2], &sc->sc_lo2); - __get_user(regs->active_tc.LO[3], &sc->sc_lo3); - { - uint32_t dsp; - __get_user(dsp, &sc->sc_dsp); - cpu_wrdsp(dsp, 0x3ff, regs); - } - - for (i = 0; i < 32; ++i) { - __get_user(regs->active_fpu.fpr[i].d, &sc->sc_fpregs[i]); - } -} - -/* - * Determine which stack to use.. - */ -static inline abi_ulong -get_sigframe(struct target_sigaction *ka, CPUMIPSState *regs, size_t frame_size) -{ - unsigned long sp; - - /* Default to using normal stack */ - sp = regs->active_tc.gpr[29]; - - /* - * FPU emulator may have its own trampoline active just - * above the user stack, 16-bytes before the next lowest - * 16 byte boundary. Try to avoid trashing it. - */ - sp -= 32; - - /* This is the X/Open sanctioned signal stack switching. */ - if ((ka->sa_flags & TARGET_SA_ONSTACK) && (sas_ss_flags (sp) == 0)) { - sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size; - } - - return (sp - frame_size) & ~7; -} - -static void mips_set_hflags_isa_mode_from_pc(CPUMIPSState *env) -{ - if (env->insn_flags & (ASE_MIPS16 | ASE_MICROMIPS)) { - env->hflags &= ~MIPS_HFLAG_M16; - env->hflags |= (env->active_tc.PC & 1) << MIPS_HFLAG_M16_SHIFT; - env->active_tc.PC &= ~(target_ulong) 1; - } -} - -# if defined(TARGET_ABI_MIPSO32) -/* compare linux/arch/mips/kernel/signal.c:setup_frame() */ -static void setup_frame(int sig, struct target_sigaction * ka, - target_sigset_t *set, CPUMIPSState *regs) -{ - struct sigframe *frame; - abi_ulong frame_addr; - int i; - - frame_addr = get_sigframe(ka, regs, sizeof(*frame)); - trace_user_setup_frame(regs, frame_addr); - if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { - goto give_sigsegv; - } - - install_sigtramp(frame->sf_code, TARGET_NR_sigreturn); - - setup_sigcontext(regs, &frame->sf_sc); - - for(i = 0; i < TARGET_NSIG_WORDS; i++) { - __put_user(set->sig[i], &frame->sf_mask.sig[i]); - } - - /* - * Arguments to signal handler: - * - * a0 = signal number - * a1 = 0 (should be cause) - * a2 = pointer to struct sigcontext - * - * $25 and PC point to the signal handler, $29 points to the - * struct sigframe. - */ - regs->active_tc.gpr[ 4] = sig; - regs->active_tc.gpr[ 5] = 0; - regs->active_tc.gpr[ 6] = frame_addr + offsetof(struct sigframe, sf_sc); - regs->active_tc.gpr[29] = frame_addr; - regs->active_tc.gpr[31] = frame_addr + offsetof(struct sigframe, sf_code); - /* The original kernel code sets CP0_EPC to the handler - * since it returns to userland using eret - * we cannot do this here, and we must set PC directly */ - regs->active_tc.PC = regs->active_tc.gpr[25] = ka->_sa_handler; - mips_set_hflags_isa_mode_from_pc(regs); - unlock_user_struct(frame, frame_addr, 1); - return; - -give_sigsegv: - force_sigsegv(sig); -} - -long do_sigreturn(CPUMIPSState *regs) -{ - struct sigframe *frame; - abi_ulong frame_addr; - sigset_t blocked; - target_sigset_t target_set; - int i; - - frame_addr = regs->active_tc.gpr[29]; - trace_user_do_sigreturn(regs, frame_addr); - if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) - goto badframe; - - for(i = 0; i < TARGET_NSIG_WORDS; i++) { - __get_user(target_set.sig[i], &frame->sf_mask.sig[i]); - } - - target_to_host_sigset_internal(&blocked, &target_set); - set_sigmask(&blocked); - - restore_sigcontext(regs, &frame->sf_sc); - -#if 0 - /* - * Don't let your children do this ... - */ - __asm__ __volatile__( - "move\t$29, %0\n\t" - "j\tsyscall_exit" - :/* no outputs */ - :"r" (®s)); - /* Unreached */ -#endif - - regs->active_tc.PC = regs->CP0_EPC; - mips_set_hflags_isa_mode_from_pc(regs); - /* I am not sure this is right, but it seems to work - * maybe a problem with nested signals ? */ - regs->CP0_EPC = 0; - return -TARGET_QEMU_ESIGRETURN; - -badframe: - force_sig(TARGET_SIGSEGV); - return -TARGET_QEMU_ESIGRETURN; -} -# endif /* O32 */ - -static void setup_rt_frame(int sig, struct target_sigaction *ka, - target_siginfo_t *info, - target_sigset_t *set, CPUMIPSState *env) -{ - struct target_rt_sigframe *frame; - abi_ulong frame_addr; - int i; - - frame_addr = get_sigframe(ka, env, sizeof(*frame)); - trace_user_setup_rt_frame(env, frame_addr); - if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { - goto give_sigsegv; - } - - install_sigtramp(frame->rs_code, TARGET_NR_rt_sigreturn); - - tswap_siginfo(&frame->rs_info, info); - - __put_user(0, &frame->rs_uc.tuc_flags); - __put_user(0, &frame->rs_uc.tuc_link); - __put_user(target_sigaltstack_used.ss_sp, &frame->rs_uc.tuc_stack.ss_sp); - __put_user(target_sigaltstack_used.ss_size, &frame->rs_uc.tuc_stack.ss_size); - __put_user(sas_ss_flags(get_sp_from_cpustate(env)), - &frame->rs_uc.tuc_stack.ss_flags); - - setup_sigcontext(env, &frame->rs_uc.tuc_mcontext); - - for(i = 0; i < TARGET_NSIG_WORDS; i++) { - __put_user(set->sig[i], &frame->rs_uc.tuc_sigmask.sig[i]); - } - - /* - * Arguments to signal handler: - * - * a0 = signal number - * a1 = pointer to siginfo_t - * a2 = pointer to ucontext_t - * - * $25 and PC point to the signal handler, $29 points to the - * struct sigframe. - */ - env->active_tc.gpr[ 4] = sig; - env->active_tc.gpr[ 5] = frame_addr - + offsetof(struct target_rt_sigframe, rs_info); - env->active_tc.gpr[ 6] = frame_addr - + offsetof(struct target_rt_sigframe, rs_uc); - env->active_tc.gpr[29] = frame_addr; - env->active_tc.gpr[31] = frame_addr - + offsetof(struct target_rt_sigframe, rs_code); - /* The original kernel code sets CP0_EPC to the handler - * since it returns to userland using eret - * we cannot do this here, and we must set PC directly */ - env->active_tc.PC = env->active_tc.gpr[25] = ka->_sa_handler; - mips_set_hflags_isa_mode_from_pc(env); - unlock_user_struct(frame, frame_addr, 1); - return; - -give_sigsegv: - unlock_user_struct(frame, frame_addr, 1); - force_sigsegv(sig); -} - -long do_rt_sigreturn(CPUMIPSState *env) -{ - struct target_rt_sigframe *frame; - abi_ulong frame_addr; - sigset_t blocked; - - frame_addr = env->active_tc.gpr[29]; - trace_user_do_rt_sigreturn(env, frame_addr); - if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { - goto badframe; - } - - target_to_host_sigset(&blocked, &frame->rs_uc.tuc_sigmask); - set_sigmask(&blocked); - - restore_sigcontext(env, &frame->rs_uc.tuc_mcontext); - - if (do_sigaltstack(frame_addr + - offsetof(struct target_rt_sigframe, rs_uc.tuc_stack), - 0, get_sp_from_cpustate(env)) == -EFAULT) - goto badframe; - - env->active_tc.PC = env->CP0_EPC; - mips_set_hflags_isa_mode_from_pc(env); - /* I am not sure this is right, but it seems to work - * maybe a problem with nested signals ? */ - env->CP0_EPC = 0; - return -TARGET_QEMU_ESIGRETURN; - -badframe: - force_sig(TARGET_SIGSEGV); - return -TARGET_QEMU_ESIGRETURN; -} - -#elif defined(TARGET_PPC) +#if defined(TARGET_PPC) /* Size of dummy stack frame allocated when calling signal handler. See arch/powerpc/include/asm/ptrace.h. */ |