diff options
| -rw-r--r-- | linux-user/hppa/signal.c | 41 | ||||
| -rw-r--r-- | linux-user/hppa/target_signal.h | 14 |
2 files changed, 32 insertions, 23 deletions
diff --git a/linux-user/hppa/signal.c b/linux-user/hppa/signal.c index 962f551..396e310 100644 --- a/linux-user/hppa/signal.c +++ b/linux-user/hppa/signal.c @@ -41,7 +41,7 @@ struct target_ucontext { }; struct target_rt_sigframe { - abi_uint tramp[9]; + abi_uint tramp[2]; /* syscall restart return address */ target_siginfo_t info; struct target_ucontext uc; /* hidden location of upper halves of pa2.0 64-bit gregs */ @@ -101,9 +101,15 @@ static void restore_sigcontext(CPUArchState *env, struct target_sigcontext *sc) __get_user(env->cr[CR_SAR], &sc->sc_sar); } -/* No, this doesn't look right, but it's copied straight from the kernel. */ +#if TARGET_ABI_BITS == 32 +#define SIGFRAME 64 +#define FUNCTIONCALLFRAME 48 +#else +#define SIGFRAME 128 +#define FUNCTIONCALLFRAME 96 +#endif #define PARISC_RT_SIGFRAME_SIZE32 \ - ((sizeof(struct target_rt_sigframe) + 48 + 64) & -64) + ((sizeof(struct target_rt_sigframe) + FUNCTIONCALLFRAME + SIGFRAME) & -SIGFRAME) void setup_rt_frame(int sig, struct target_sigaction *ka, target_siginfo_t *info, @@ -118,7 +124,7 @@ void setup_rt_frame(int sig, struct target_sigaction *ka, if ((ka->sa_flags & TARGET_SA_ONSTACK) && !sas_ss_flags(sp)) { sp = (ts->sigaltstack_used.ss_sp + 0x7f) & ~0x3f; } - frame_addr = QEMU_ALIGN_UP(sp, 64); + frame_addr = QEMU_ALIGN_UP(sp, SIGFRAME); sp = frame_addr + PARISC_RT_SIGFRAME_SIZE32; trace_user_setup_rt_frame(env, frame_addr); @@ -139,14 +145,9 @@ void setup_rt_frame(int sig, struct target_sigaction *ka, setup_sigcontext(&frame->uc.tuc_mcontext, env); - __put_user(0x34190000, frame->tramp + 0); /* ldi 0,%r25 */ - __put_user(0x3414015a, frame->tramp + 1); /* ldi __NR_rt_sigreturn,%r20 */ - __put_user(0xe4008200, frame->tramp + 2); /* be,l 0x100(%sr2,%r0) */ - __put_user(0x08000240, frame->tramp + 3); /* nop */ - unlock_user_struct(frame, frame_addr, 1); - env->gr[2] = h2g(frame->tramp); + env->gr[2] = default_rt_sigreturn; env->gr[30] = sp; env->gr[26] = sig; env->gr[25] = h2g(&frame->info); @@ -197,3 +198,23 @@ long do_rt_sigreturn(CPUArchState *env) force_sig(TARGET_SIGSEGV); return -QEMU_ESIGRETURN; } + +void setup_sigtramp(abi_ulong sigtramp_page) +{ + uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 6*4, 0); + abi_ulong SIGFRAME_CONTEXT_REGS32; + assert(tramp != NULL); + + SIGFRAME_CONTEXT_REGS32 = offsetof(struct target_rt_sigframe, uc.tuc_mcontext); + SIGFRAME_CONTEXT_REGS32 -= PARISC_RT_SIGFRAME_SIZE32; + + __put_user(SIGFRAME_CONTEXT_REGS32, tramp + 0); + __put_user(0x08000240, tramp + 1); /* nop - b/c dwarf2 unwind routines */ + __put_user(0x34190000, tramp + 2); /* ldi 0, %r25 (in_syscall=0) */ + __put_user(0x3414015a, tramp + 3); /* ldi __NR_rt_sigreturn, %r20 */ + __put_user(0xe4008200, tramp + 4); /* ble 0x100(%sr2, %r0) */ + __put_user(0x08000240, tramp + 5); /* nop */ + + default_rt_sigreturn = (sigtramp_page + 8) | 3; + unlock_user(tramp, sigtramp_page, 6*4); +} diff --git a/linux-user/hppa/target_signal.h b/linux-user/hppa/target_signal.h index af6c2fc..190bb3d 100644 --- a/linux-user/hppa/target_signal.h +++ b/linux-user/hppa/target_signal.h @@ -70,18 +70,6 @@ typedef struct target_sigaltstack { /* mask for all SS_xxx flags */ #define TARGET_SS_FLAG_BITS TARGET_SS_AUTODISARM -/* - * We cannot use a bare sigtramp page for hppa-linux. - * - * Unlike other guests where we use the instructions at PC to validate - * an offset from SP, the hppa libgcc signal frame fallback unwinding uses - * the PC address itself to find the frame. This is due to the fact that - * the hppa grows the stack upward, and the frame is of unknown size. - * - * TODO: We should be able to use a VDSO to address this, by providing - * proper unwind info for the sigtramp code, at which point the fallback - * unwinder will not be used. - */ -#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 0 +#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 1 #endif /* HPPA_TARGET_SIGNAL_H */ |