/* arch/sparc64/kernel/signal32.c * * Copyright (C) 1991, 1992 Linus Torvalds * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx) * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "sigutil.h" #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) /* This magic should be in g_upper[0] for all upper parts * to be valid. */ #define SIGINFO_EXTRA_V8PLUS_MAGIC 0x130e269 typedef struct { unsigned int g_upper[8]; unsigned int o_upper[8]; unsigned int asi; } siginfo_extra_v8plus_t; struct signal_frame32 { struct sparc_stackf32 ss; __siginfo32_t info; /* __siginfo_fpu_t * */ u32 fpu_save; unsigned int insns[2]; unsigned int extramask[_COMPAT_NSIG_WORDS - 1]; unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ /* Only valid if (info.si_regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ siginfo_extra_v8plus_t v8plus; /* __siginfo_rwin_t * */u32 rwin_save; } __attribute__((aligned(8))); typedef struct compat_siginfo{ int si_signo; int si_errno; int si_code; union { int _pad[SI_PAD_SIZE32]; /* kill() */ struct { compat_pid_t _pid; /* sender's pid */ unsigned int _uid; /* sender's uid */ } _kill; /* POSIX.1b timers */ struct { compat_timer_t _tid; /* timer id */ int _overrun; /* overrun count */ compat_sigval_t _sigval; /* same as below */ int _sys_private; /* not to be passed to user */ } _timer; /* POSIX.1b signals */ struct { compat_pid_t _pid; /* sender's pid */ unsigned int _uid; /* sender's uid */ compat_sigval_t _sigval; } _rt; /* SIGCHLD */ struct { compat_pid_t _pid; /* which child */ unsigned int _uid; /* sender's uid */ int _status; /* exit code */ compat_clock_t _utime; compat_clock_t _stime; } _sigchld; /* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGEMT */ struct { u32 _addr; /* faulting insn/memory ref. */ int _trapno; } _sigfault; /* SIGPOLL */ struct { int _band; /* POLL_IN, POLL_OUT, POLL_MSG */ int _fd; } _sigpoll; } _sifields; }compat_siginfo_t; struct rt_signal_frame32 { struct sparc_stackf32 ss; compat_siginfo_t info; struct pt_regs32 regs; compat_sigset_t mask; /* __siginfo_fpu_t * */ u32 fpu_save; unsigned int insns[2]; stack_t32 stack; unsigned int extra_size; /* Should be sizeof(siginfo_extra_v8plus_t) */ /* Only valid if (regs.psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS */ siginfo_extra_v8plus_t v8plus; /* __siginfo_rwin_t * */u32 rwin_save; } __attribute__((aligned(8))); int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) { int err; if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t))) return -EFAULT; /* If you change siginfo_t structure, please be sure this code is fixed accordingly. It should never copy any pad contained in the structure to avoid security leaks, but must copy the generic 3 ints plus the relevant union member. This routine must convert siginfo from 64bit to 32bit as well at the same time. */ err = __put_user(from->si_signo, &to->si_signo); err |= __put_user(from->si_errno, &to->si_errno); err |= __put_user((short)from->si_code, &to->si_code); if (from->si_code < 0) err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); else { switch (from->si_code >> 16) { case __SI_TIMER >> 16: err |= __put_user(from->si_tid, &to->si_tid); err |= __put_user(from->si_overrun, &to->si_overrun); err |= __put_user(from->si_int, &to->si_int); break; case __SI_CHLD >> 16: err |= __put_user(from->si_utime, &to->si_utime); err |= __put_user(from->si_stime, &to->si_stime); err |= __put_user(from->si_status, &to->si_status); default: err |= __put_user(from->si_pid, &to->si_pid); err |= __put_user(from->si_uid, &to->si_uid); break; case __SI_FAULT >> 16: err |= __put_user(from->si_trapno, &to->si_trapno); err |= __put_user((unsigned long)from->si_addr, &to->si_addr); break; case __SI_POLL >> 16: err |= __put_user(from->si_band, &to->si_band); err |= __put_user(from->si_fd, &to->si_fd); break; case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ case __SI_MESGQ >> 16: err |= __put_user(from->si_pid, &to->si_pid); err |= __put_user(from->si_uid, &to->si_uid); err |= __put_user(from->si_int, &to->si_int); break; } } return err; } /* CAUTION: This is just a very minimalist implementation for the * sake of compat_sys_rt_sigqueueinfo() */ int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) { if (!access_ok(VERIFY_WRITE, from, sizeof(compat_siginfo_t))) return -EFAULT; if (copy_from_user(to, from, 3*sizeof(int)) || copy_from_user(to->_sifields._pad, from->_sifields._pad, SI_PAD_SIZE)) return -EFAULT; return 0; } void do_sigreturn32(struct pt_regs *regs) { struct signal_frame32 __user *sf; compat_uptr_t fpu_save; compat_uptr_t rwin_save; unsigned int psr; unsigned pc, npc; sigset_t set; unsigned seta[_COMPAT_NSIG_WORDS]; int err, i; /* Always make any pending restarted system calls return -EINTR */ current_thread_info()->restart_block.fn = do_no_restart_syscall; synchronize_user_stack(); regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP]; /* 1. Make sure we are not getting garbage from the user */ if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) || (((unsigned long) sf) & 3)) goto segv; get_user(pc, &sf->info.si_regs.pc); __get_user(npc, &sf->info.si_regs.npc); if ((pc | npc) & 3) goto segv; if (test_thread_flag(TIF_32BIT)) { pc &= 0xffffffff; npc &= 0xffffffff; } regs->tpc = pc; regs->tnpc = npc; /* 2. Restore the state */ err = __get_user(regs->y, &sf->info.si_regs.y); err |= __get_user(psr, &sf->info.si_regs.psr); for (i = UREG_G1; i <= UREG_I7; i++) err |= __get_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { err |= __get_user(i, &sf->v8plus.g_upper[0]); if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { unsigned long asi; for (i = UREG_G1; i <= UREG_I7; i++) err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); err |= __get_user(asi, &sf->v8plus.asi); regs->tstate &= ~TSTATE_ASI; regs->tstate |= ((asi & 0xffUL) << 24UL); } } /* User can only change condition codes in %tstate. */ regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); regs->tstate |= psr_to_tstate_icc(psr); /* Prevent syscall restart. */ pt_regs_clear_syscall(regs); err |= __get_user(fpu_save, &sf->fpu_save); if (!err && fpu_save) err |= restore_fpu_state(regs, compat_ptr(fpu_save)); err |= __get_user(rwin_save, &sf->rwin_save); if (!err && rwin_save) { if (restore_rwin_state(compat_ptr(rwin_save))) goto segv; } err |= __get_user(seta[0], &sf->info.si_mask); err |= copy_from_user(seta+1, &sf->extramask, (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); if (err) goto segv; switch (_NSIG_WORDS) { case 4: set.sig[3] = seta[6] + (((long)seta[7]) << 32); case 3: set.sig[2] = seta[4] + (((long)seta[5]) << 32); case 2: set.sig[1] = seta[2] + (((long)seta[3]) << 32); case 1: set.sig[0] = seta[0] + (((long)seta[1]) << 32); } sigdelsetmask(&set, ~_BLOCKABLE); set_current_blocked(&set); return; segv: force_sig(SIGSEGV, current); } asmlinkage void do_rt_sigreturn32(struct pt_regs *regs) { struct rt_signal_frame32 __user *sf; unsigned int psr, pc, npc, u_ss_sp; compat_uptr_t fpu_save; compat_uptr_t rwin_save; mm_segment_t old_fs; sigset_t set; compat_sigset_t seta; stack_t st; int err, i; /* Always make any pending restarted system calls return -EINTR */ current_thread_info()->restart_block.fn = do_no_restart_syscall; synchronize_user_stack(); regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP]; /* 1. Make sure we are not getting garbage from the user */ if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) || (((unsigned long) sf) & 3)) goto segv; get_user(pc, &sf->regs.pc); __get_user(npc, &sf->regs.npc); if ((pc | npc) & 3) goto segv; if (test_thread_flag(TIF_32BIT)) { pc &= 0xffffffff; npc &= 0xffffffff; } regs->tpc = pc; regs->tnpc = npc; /* 2. Restore the state */ err = __get_user(regs->y, &sf->regs.y); err |= __get_user(psr, &sf->regs.psr); for (i = UREG_G1; i <= UREG_I7; i++) err |= __get_user(regs->u_regs[i], &sf->regs.u_regs[i]); if ((psr & (PSR_VERS|PSR_IMPL)) == PSR_V8PLUS) { err |= __get_user(i, &sf->v8plus.g_upper[0]); if (i == SIGINFO_EXTRA_V8PLUS_MAGIC) { unsigned long asi; for (i = UREG_G1; i <= UREG_I7; i++) err |= __get_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); err |= __get_user(asi, &sf->v8plus.asi); regs->tstate &= ~TSTATE_ASI; regs->tstate |= ((asi & 0xffUL) << 24UL); } } /* User can only change condition codes in %tstate. */ regs->tstate &= ~(TSTATE_ICC|TSTATE_XCC); regs->tstate |= psr_to_tstate_icc(psr); /* Prevent syscall restart. */ pt_regs_clear_syscall(regs); err |= __get_user(fpu_save, &sf->fpu_save); if (!err && fpu_save) err |= restore_fpu_state(regs, compat_ptr(fpu_save)); err |= copy_from_user(&seta, &sf->mask, sizeof(compat_sigset_t)); err |= __get_user(u_ss_sp, &sf->stack.ss_sp); st.ss_sp = compat_ptr(u_ss_sp); err |= __get_user(st.ss_flags, &sf->stack.ss_flags); err |= __get_user(st.ss_size, &sf->stack.ss_size); if (err) goto segv; /* It is more difficult to avoid calling this function than to call it and ignore errors. */ old_fs = get_fs(); set_fs(KERNEL_DS); do_sigaltstack((stack_t __user *) &st, NULL, (unsigned long)sf); set_fs(old_fs); err |= __get_user(rwin_save, &sf->rwin_save); if (!err && rwin_save) { if (restore_rwin_state(compat_ptr(rwin_save))) goto segv; } switch (_NSIG_WORDS) { case 4: set.sig[3] = seta.sig[6] + (((long)seta.sig[7]) << 32); case 3: set.sig[2] = seta.sig[4] + (((long)seta.sig[5]) << 32); case 2: set.sig[1] = seta.sig[2] + (((long)seta.sig[3]) << 32); case 1: set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32); } sigdelsetmask(&set, ~_BLOCKABLE); set_current_blocked(&set); return; segv: force_sig(SIGSEGV, current); } /* Checks if the fp is valid */ static int invalid_frame_pointer(void __user *fp, int fplen) { if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen) return 1; return 0; } static void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize) { unsigned long sp; regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; sp = regs->u_regs[UREG_FP]; /* * If we are on the alternate signal stack and would overflow it, don't. * Return an always-bogus address instead so we will die with SIGSEGV. */ if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) return (void __user *) -1L; /* This is the X/Open sanctioned signal stack switching. */ if (sa->sa_flags & SA_ONSTACK) { if (sas_ss_flags(sp) == 0) sp = current->sas_ss_sp + current->sas_ss_size; } sp -= framesize; /* Always align the stack frame. This handles two cases. First, * sigaltstack need not be mindful of platform specific stack * alignment. Second, if we took this signal because the stack * is not aligned properly, we'd like to take the signal cleanly * and report that. */ sp &= ~15UL; return (void __user *) sp; } /* The I-cache flush instruction only works in the primary ASI, which * right now is the nucleus, aka. kernel space. * * Therefore we have to kick the instructions out using the kernel * side linear mapping of the physical address backing the user * instructions. */ static void flush_signal_insns(unsigned long address) { unsigned long pstate, paddr; pte_t *ptep, pte; pgd_t *pgdp; pud_t *pudp; pmd_t *pmdp; /* Commit all stores of the instructions we are about to flush. */ wmb(); /* Disable cross-call reception. In this way even a very wide * munmap() on another cpu can't tear down the page table * hierarchy from underneath us, since that can't complete * until the IPI tlb flush returns. */ __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate)); __asm__ __volatile__("wrpr %0, %1, %%pstate" : : "r" (pstate), "i" (PSTATE_IE)); pgdp = pgd_offset(current->mm, address); if (pgd_none(*pgdp)) goto out_irqs_on; pudp = pud_offset(pgdp, address); if (pud_none(*pudp)) goto out_irqs_on; pmdp = pmd_offset(pudp, address); if (pmd_none(*pmdp)) goto out_irqs_on; ptep = pte_offset_map(pmdp, address); pte = *ptep; if (!pte_present(pte)) goto out_unmap; paddr = (unsigned long) page_address(pte_page(pte)); __asm__ __volatile__("flush %0 + %1" : /* no outputs */ : "r" (paddr), "r" (address & (PAGE_SIZE - 1)) : "memory"); out_unmap: pte_unmap(ptep); out_irqs_on: __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate)); } static int setup_frame32(struct k_sigaction *ka, struct pt_regs *regs, int signo, sigset_t *oldset) { struct signal_frame32 __user *sf; int i, err, wsaved; void __user *tail; int sigframe_size; u32 psr; unsigned int seta[_COMPAT_NSIG_WORDS]; /* 1. Make sure everything is clean */ synchronize_user_stack(); save_and_clear_fpu(); wsaved = get_thread_wsaved(); sigframe_size = sizeof(*sf); if (current_thread_info()->fpsaved[0] & FPRS_FEF) sigframe_size += sizeof(__siginfo_fpu_t); if (wsaved) sigframe_size += sizeof(__siginfo_rwin_t); sf = (struct signal_frame32 __user *) get_sigframe(&ka->sa, regs, sigframe_size); if (invalid_frame_pointer(sf, sigframe_size)) goto sigill; tail = (sf + 1); /* 2. Save the current process state */ if (test_thread_flag(TIF_32BIT)) { regs->tpc &= 0xffffffff; regs->tnpc &= 0xffffffff; } err = put_user(regs->tpc, &sf->info.si_regs.pc); err |= __put_user(regs->tnpc, &sf->info.si_regs.npc); err |= __put_user(regs->y, &sf->info.si_regs.y); psr = tstate_to_psr(regs->tstate); if (current_thread_info()->fpsaved[0] & FPRS_FEF) psr |= PSR_EF; err |= __put_user(psr, &sf->info.si_regs.psr); for (i = 0; i < 16; i++) err |= __put_user(regs->u_regs[i], &sf->info.si_regs.u_regs[i]); err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); for (i = 1; i < 16; i++) err |= __put_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, &sf->v8plus.asi); if (psr & PSR_EF) { __siginfo_fpu_t __user *fp = tail; tail += sizeof(*fp); err |= save_fpu_state(regs, fp); err |= __put_user((u64)fp, &sf->fpu_save); } else { err |= __put_user(0, &sf->fpu_save); } if (wsaved) { __siginfo_rwin_t __user *rwp = tail; tail += sizeof(*rwp); err |= save_rwin_state(wsaved, rwp); err |= __put_user((u64)rwp, &sf->rwin_save); set_thread_wsaved(0); } else { err |= __put_user(0, &sf->rwin_save); } switch (_NSIG_WORDS) { case 4: seta[7] = (oldset->sig[3] >> 32); seta[6] = oldset->sig[3]; case 3: seta[5] = (oldset->sig[2] >> 32); seta[4] = oldset->sig[2]; case 2: seta[3] = (oldset->sig[1] >> 32); seta[2] = oldset->sig[1]; case 1: seta[1] = (oldset->sig[0] >> 32); seta[0] = oldset->sig[0]; } err |= __put_user(seta[0], &sf->info.si_mask); err |= __copy_to_user(sf->extramask, seta + 1, (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); if (!wsaved) { err |= copy_in_user((u32 __user *)sf, (u32 __user *)(regs->u_regs[UREG_FP]), sizeof(struct reg_window32)); } else { struct reg_window *rp; rp = ¤t_thread_info()->reg_window[wsaved - 1]; for (i = 0; i < 8; i++) err |= __put_user(rp->locals[i], &sf->ss.locals[i]); for (i = 0; i < 6; i++) err |= __put_user(rp->ins[i], &sf->ss.ins[i]); err |= __put_user(rp->ins[6], &sf->ss.fp); err |= __put_user(rp->ins[7], &sf->ss.callers_pc); } if (err) goto sigsegv; /* 3. signal handler back-trampoline and parameters */ regs->u_regs[UREG_FP] = (unsigned long) sf; regs->u_regs[UREG_I0] = signo; regs->u_regs[UREG_I1] = (unsigned long) &sf->info; regs->u_regs[UREG_I2] = (unsigned long) &sf->info; /* 4. signal handler */ regs->tpc = (unsigned long) ka->sa.sa_handler; regs->tnpc = (regs->tpc + 4); if (test_thread_flag(TIF_32BIT)) { regs->tpc &= 0xffffffff; regs->tnpc &= 0xffffffff; } /* 5. return to kernel instructions */ if (ka->ka_restorer) { regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; } else { unsigned long address = ((unsigned long)&(sf->insns[0])); regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); err = __put_user(0x821020d8, &sf->insns[0]); /*mov __NR_sigreturn, %g1*/ err |= __put_user(0x91d02010, &sf->insns[1]); /*t 0x10*/ if (err) goto sigsegv; flush_signal_insns(address); } return 0; sigill: do_exit(SIGILL); return -EINVAL; sigsegv: force_sigsegv(signo, current); return -EFAULT; } static int setup_rt_frame32(struct k_sigaction *ka, struct pt_regs *regs, unsigned long signr, sigset_t *oldset, siginfo_t *info) { struct rt_signal_frame32 __user *sf; int i, err, wsaved; void __user *tail; int sigframe_size; u32 psr; compat_sigset_t seta; /* 1. Make sure everything is clean */ synchronize_user_stack(); save_and_clear_fpu(); wsaved = get_thread_wsaved(); sigframe_size = sizeof(*sf); if (current_thread_info()->fpsaved[0] & FPRS_FEF) sigframe_size += sizeof(__siginfo_fpu_t); if (wsaved) sigframe_size += sizeof(__siginfo_rwin_t); sf = (struct rt_signal_frame32 __user *) get_sigframe(&ka->sa, regs, sigframe_size); if (invalid_frame_pointer(sf, sigframe_size)) goto sigill; tail = (sf + 1); /* 2. Save the current process state */ if (test_thread_flag(TIF_32BIT)) { regs->tpc &= 0xffffffff; regs->tnpc &= 0xffffffff; } err = put_user(regs->tpc, &sf->regs.pc); err |= __put_user(regs->tnpc, &sf->regs.npc); err |= __put_user(regs->y, &sf->regs.y); psr = tstate_to_psr(regs->tstate); if (current_thread_info()->fpsaved[0] & FPRS_FEF) psr |= PSR_EF; err |= __put_user(psr, &sf->regs.psr); for (i = 0; i < 16; i++) err |= __put_user(regs->u_regs[i], &sf->regs.u_regs[i]); err |= __put_user(sizeof(siginfo_extra_v8plus_t), &sf->extra_size); err |= __put_user(SIGINFO_EXTRA_V8PLUS_MAGIC, &sf->v8plus.g_upper[0]); for (i = 1; i < 16; i++) err |= __put_user(((u32 *)regs->u_regs)[2*i], &sf->v8plus.g_upper[i]); err |= __put_user((regs->tstate & TSTATE_ASI) >> 24UL, &sf->v8plus.asi); if (psr & PSR_EF) { __siginfo_fpu_t __user *fp = tail; tail += sizeof(*fp); err |= save_fpu_state(regs, fp); err |= __put_user((u64)fp, &sf->fpu_save); } else { err |= __put_user(0, &sf->fpu_save); } if (wsaved) { __siginfo_rwin_t __user *rwp = tail; tail += sizeof(*rwp); err |= save_rwin_state(wsaved, rwp); err |= __put_user((u64)rwp, &sf->rwin_save); set_thread_wsaved(0); } else { err |= __put_user(0, &sf->rwin_save); } /* Update the siginfo structure. */ err |= copy_siginfo_to_user32(&sf->info, info); /* Setup sigaltstack */ err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp); err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags); err |= __put_user(current->sas_ss_size, &sf->stack.ss_size); switch (_NSIG_WORDS) { case 4: seta.sig[7] = (oldset->sig[3] >> 32); seta.sig[6] = oldset->sig[3]; case 3: seta.sig[5] = (oldset->sig[2] >> 32); seta.sig[4] = oldset->sig[2]; case 2: seta.sig[3] = (oldset->sig[1] >> 32); seta.sig[2] = oldset->sig[1]; case 1: seta.sig[1] = (oldset->sig[0] >> 32); seta.sig[0] = oldset->sig[0]; } err |= __copy_to_user(&sf->mask, &seta, sizeof(compat_sigset_t)); if (!wsaved) { err |= copy_in_user((u32 __user *)sf, (u32 __user *)(regs->u_regs[UREG_FP]), sizeof(struct reg_window32)); } else { struct reg_window *rp; rp = ¤t_thread_info()->reg_window[wsaved - 1]; for (i = 0; i < 8; i++) err |= __put_user(rp->locals[i], &sf->ss.locals[i]); for (i = 0; i < 6; i++) err |= __put_user(rp->ins[i], &sf->ss.ins[i]); err |= __put_user(rp->ins[6], &sf->ss.fp); err |= __put_user(rp->ins[7], &sf->ss.callers_pc); } if (err) goto sigsegv; /* 3. signal handler back-trampoline and parameters */ regs->u_regs[UREG_FP] = (unsigned long) sf; regs->u_regs[UREG_I0] = signr; regs->u_regs[UREG_I1] = (unsigned long) &sf->info; regs->u_regs[UREG_I2] = (unsigned long) &sf->regs; /* 4. signal handler */ regs->tpc = (unsigned long) ka->sa.sa_handler; regs->tnpc = (regs->tpc + 4); if (test_thread_flag(TIF_32BIT)) { regs->tpc &= 0xffffffff; regs->tnpc &= 0xffffffff; } /* 5. return to kernel instructions */ if (ka->ka_restorer) regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer; else { unsigned long address = ((unsigned long)&(sf->insns[0])); regs->u_regs[UREG_I7] = (unsigned long) (&(sf->insns[0]) - 2); /* mov __NR_rt_sigreturn, %g1 */ err |= __put_user(0x82102065, &sf->insns[0]); /* t 0x10 */ err |= __put_user(0x91d02010, &sf->insns[1]); if (err) goto sigsegv; flush_signal_insns(address); } return 0; sigill: do_exit(SIGILL); return -EINVAL; sigsegv: force_sigsegv(signr, current); return -EFAULT; } static inline int handle_signal32(unsigned long signr, struct k_sigaction *ka, siginfo_t *info, sigset_t *oldset, struct pt_regs *regs) { sigset_t blocked; int err; if (ka->sa.sa_flags & SA_SIGINFO) err = setup_rt_frame32(ka, regs, signr, oldset, info); else err = setup_frame32(ka, regs, signr, oldset); if (err) return err; sigorsets(&blocked, ¤t->blocked, &ka->sa.sa_mask); if (!(ka->sa.sa_flags & SA_NOMASK)) sigaddset(&blocked, signr); set_current_blocked(&blocked); tracehook_signal_handler(signr, info, ka, regs, 0); return 0; } static inline void syscall_restart32(unsigned long orig_i0, struct pt_regs *regs, struct sigaction *sa) { switch (regs->u_regs[UREG_I0]) { case ERESTART_RESTARTBLOCK: case ERESTARTNOHAND: no_system_call_restart: regs->u_regs[UREG_I0] = EINTR; regs->tstate |= TSTATE_ICARRY; break; case ERESTARTSYS: if (!(sa->sa_flags & SA_RESTART)) goto no_system_call_restart; /* fallthrough */ case ERESTARTNOINTR: regs->u_regs[UREG_I0] = orig_i0; regs->tpc -= 4; regs->tnpc -= 4; } } /* Note that 'init' is a special process: it doesn't get signals it doesn't * want to handle. Thus you cannot kill init even with a SIGKILL even by * mistake. */ void do_signal32(sigset_t *oldset, struct pt_regs * regs, int restart_syscall, unsigned long orig_i0) { struct k_sigaction ka; siginfo_t info; int signr; signr = get_signal_to_deliver(&info, &ka, regs, NULL); /* If the debugger messes with the program counter, it clears * the "in syscall" bit, directing us to not perform a syscall * restart. */ if (restart_syscall && !pt_regs_is_syscall(regs)) restart_syscall = 0; if (signr > 0) { if (restart_syscall) syscall_restart32(orig_i0, regs, &ka.sa); if (handle_signal32(signr, &ka, &info, oldset, regs) == 0) { /* A signal was successfully delivered; the saved * sigmask will have been stored in the signal frame, * and will be restored by sigreturn, so we can simply * clear the TS_RESTORE_SIGMASK flag. */ current_thread_info()->status &= ~TS_RESTORE_SIGMASK; } return; } if (restart_syscall && (regs->u_regs[UREG_I0] == ERESTARTNOHAND || regs->u_regs[UREG_I0] == ERESTARTSYS || regs->u_regs[UREG_I0] == ERESTARTNOINTR)) { /* replay the system call when we are done */ regs->u_regs[UREG_I0] = orig_i0; regs->tpc -= 4; regs->tnpc -= 4; pt_regs_clear_syscall(regs); } if (restart_syscall && regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) { regs->u_regs[UREG_G1] = __NR_restart_syscall; regs->tpc -= 4; regs->tnpc -= 4; pt_regs_clear_syscall(regs); } /* If there's no signal to deliver, we just put the saved sigmask * back */ if (current_thread_info()->status & TS_RESTORE_SIGMASK) { current_thread_info()->status &= ~TS_RESTORE_SIGMASK; sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); } } struct sigstack32 { u32 the_stack; int cur_status; }; asmlinkage int do_sys32_sigstack(u32 u_ssptr, u32 u_ossptr, unsigned long sp) { struct sigstack32 __user *ssptr = (struct sigstack32 __user *)((unsigned long)(u_ssptr)); struct sigstack32 __user *ossptr = (struct sigstack32 __user *)((unsigned long)(u_ossptr)); int ret = -EFAULT; /* First see if old state is wanted. */ if (ossptr) { if (put_user(current->sas_ss_sp + current->sas_ss_size, &ossptr->the_stack) || __put_user(on_sig_stack(sp), &ossptr->cur_status)) goto out; } /* Now see if we want to update the new state. */ if (ssptr) { u32 ss_sp; if (get_user(ss_sp, &ssptr->the_stack)) goto out; /* If the current stack was set with sigaltstack, don't * swap stacks while we are on it. */ ret = -EPERM; if (current->sas_ss_sp && on_sig_stack(sp)) goto out; /* Since we don't know the extent of the stack, and we don't * track onstack-ness, but rather calculate it, we must * presume a size. Ho hum this interface is lossy. */ current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; current->sas_ss_size = SIGSTKSZ; } ret = 0; out: return ret; } asmlinkage long do_sys32_sigaltstack(u32 ussa, u32 uossa, unsigned long sp) { stack_t uss, uoss; u32 u_ss_sp = 0; int ret; mm_segment_t old_fs; stack_t32 __user *uss32 = compat_ptr(ussa); stack_t32 __user *uoss32 = compat_ptr(uossa); if (ussa && (get_user(u_ss_sp, &uss32->ss_sp) || __get_user(uss.ss_flags, &uss32->ss_flags) || __get_user(uss.ss_size, &uss32->ss_size))) return -EFAULT; uss.ss_sp = compat_ptr(u_ss_sp); old_fs = get_fs(); set_fs(KERNEL_DS); ret = do_sigaltstack(ussa ? (stack_t __user *) &uss : NULL, uossa ? (stack_t __user *) &uoss : NULL, sp); set_fs(old_fs); if (!ret && uossa && (put_user(ptr_to_compat(uoss.ss_sp), &uoss32->ss_sp) || __put_user(uoss.ss_flags, &uoss32->ss_flags) || __put_user(uoss.ss_size, &uoss32->ss_size))) return -EFAULT; return ret; }