| // SPDX-License-Identifier: GPL-2.0 |
| /* 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 <linux/sched.h> |
| #include <linux/kernel.h> |
| #include <linux/signal.h> |
| #include <linux/errno.h> |
| #include <linux/wait.h> |
| #include <linux/ptrace.h> |
| #include <linux/unistd.h> |
| #include <linux/mm.h> |
| #include <linux/tty.h> |
| #include <linux/binfmts.h> |
| #include <linux/compat.h> |
| #include <linux/bitops.h> |
| #include <linux/tracehook.h> |
| |
| #include <linux/uaccess.h> |
| #include <asm/ptrace.h> |
| #include <asm/pgtable.h> |
| #include <asm/psrcompat.h> |
| #include <asm/fpumacro.h> |
| #include <asm/visasm.h> |
| #include <asm/compat_signal.h> |
| #include <asm/switch_to.h> |
| |
| #include "sigutil.h" |
| #include "kernel.h" |
| |
| /* 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))); |
| |
| 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]; |
| compat_stack_t 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))); |
| |
| /* Checks if the fp is valid. We always build signal frames which are |
| * 16-byte aligned, therefore we can always enforce that the restore |
| * frame has that property as well. |
| */ |
| static bool invalid_frame_pointer(void __user *fp, int fplen) |
| { |
| if ((((unsigned long) fp) & 15) || |
| ((unsigned long)fp) > 0x100000000ULL - fplen) |
| return true; |
| return false; |
| } |
| |
| 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, ufp; |
| unsigned int pc, npc; |
| sigset_t set; |
| compat_sigset_t seta; |
| int err, i; |
| |
| /* Always make any pending restarted system calls return -EINTR */ |
| current->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 (invalid_frame_pointer(sf, sizeof(*sf))) |
| goto segv; |
| |
| if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP])) |
| goto segv; |
| |
| if (ufp & 0x7) |
| goto segv; |
| |
| if (__get_user(pc, &sf->info.si_regs.pc) || |
| __get_user(npc, &sf->info.si_regs.npc)) |
| goto segv; |
| |
| 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.sig[0], &sf->info.si_mask); |
| err |= copy_from_user(&seta.sig[1], &sf->extramask, |
| (_COMPAT_NSIG_WORDS - 1) * sizeof(unsigned int)); |
| if (err) |
| goto segv; |
| |
| set.sig[0] = seta.sig[0] + (((long)seta.sig[1]) << 32); |
| set_current_blocked(&set); |
| return; |
| |
| segv: |
| force_sig(SIGSEGV); |
| } |
| |
| asmlinkage void do_rt_sigreturn32(struct pt_regs *regs) |
| { |
| struct rt_signal_frame32 __user *sf; |
| unsigned int psr, pc, npc, ufp; |
| compat_uptr_t fpu_save; |
| compat_uptr_t rwin_save; |
| sigset_t set; |
| int err, i; |
| |
| /* Always make any pending restarted system calls return -EINTR */ |
| current->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 (invalid_frame_pointer(sf, sizeof(*sf))) |
| goto segv; |
| |
| if (get_user(ufp, &sf->regs.u_regs[UREG_FP])) |
| goto segv; |
| |
| if (ufp & 0x7) |
| goto segv; |
| |
| if (__get_user(pc, &sf->regs.pc) || |
| __get_user(npc, &sf->regs.npc)) |
| goto segv; |
| |
| 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 |= get_compat_sigset(&set, &sf->mask); |
| err |= compat_restore_altstack(&sf->stack); |
| if (err) |
| goto segv; |
| |
| err |= __get_user(rwin_save, &sf->rwin_save); |
| if (!err && rwin_save) { |
| if (restore_rwin_state(compat_ptr(rwin_save))) |
| goto segv; |
| } |
| |
| set_current_blocked(&set); |
| return; |
| segv: |
| force_sig(SIGSEGV); |
| } |
| |
| static void __user *get_sigframe(struct ksignal *ksig, 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. */ |
| sp = sigsp(sp, ksig) - 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 ksignal *ksig, struct pt_regs *regs, |
| sigset_t *oldset) |
| { |
| struct 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 signal_frame32 __user *) |
| get_sigframe(ksig, regs, sigframe_size); |
| |
| if (invalid_frame_pointer(sf, sigframe_size)) { |
| if (show_unhandled_signals) |
| pr_info("%s[%d] bad frame in setup_frame32: %08lx TPC %08lx O7 %08lx\n", |
| current->comm, current->pid, (unsigned long)sf, |
| regs->tpc, regs->u_regs[UREG_I7]); |
| force_sigsegv(ksig->sig); |
| return -EINVAL; |
| } |
| |
| 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); |
| } |
| |
| /* If these change we need to know - assignments to seta relies on these sizes */ |
| BUILD_BUG_ON(_NSIG_WORDS != 1); |
| BUILD_BUG_ON(_COMPAT_NSIG_WORDS != 2); |
| seta.sig[1] = (oldset->sig[0] >> 32); |
| seta.sig[0] = oldset->sig[0]; |
| |
| err |= __put_user(seta.sig[0], &sf->info.si_mask); |
| err |= __copy_to_user(sf->extramask, &seta.sig[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) |
| return err; |
| |
| /* 3. signal handler back-trampoline and parameters */ |
| regs->u_regs[UREG_FP] = (unsigned long) sf; |
| regs->u_regs[UREG_I0] = ksig->sig; |
| 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) ksig->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 (ksig->ka.ka_restorer) { |
| regs->u_regs[UREG_I7] = (unsigned long)ksig->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) |
| return err; |
| flush_signal_insns(address); |
| } |
| return 0; |
| } |
| |
| static int setup_rt_frame32(struct ksignal *ksig, struct pt_regs *regs, |
| sigset_t *oldset) |
| { |
| struct rt_signal_frame32 __user *sf; |
| int i, err, wsaved; |
| void __user *tail; |
| int sigframe_size; |
| u32 psr; |
| |
| /* 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(ksig, regs, sigframe_size); |
| |
| if (invalid_frame_pointer(sf, sigframe_size)) { |
| if (show_unhandled_signals) |
| pr_info("%s[%d] bad frame in setup_rt_frame32: %08lx TPC %08lx O7 %08lx\n", |
| current->comm, current->pid, (unsigned long)sf, |
| regs->tpc, regs->u_regs[UREG_I7]); |
| force_sigsegv(ksig->sig); |
| return -EINVAL; |
| } |
| |
| 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, &ksig->info); |
| |
| /* Setup sigaltstack */ |
| err |= __compat_save_altstack(&sf->stack, regs->u_regs[UREG_FP]); |
| |
| err |= put_compat_sigset(&sf->mask, oldset, 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) |
| return err; |
| |
| /* 3. signal handler back-trampoline and parameters */ |
| regs->u_regs[UREG_FP] = (unsigned long) sf; |
| regs->u_regs[UREG_I0] = ksig->sig; |
| 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) ksig->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 (ksig->ka.ka_restorer) |
| regs->u_regs[UREG_I7] = (unsigned long)ksig->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) |
| return err; |
| |
| flush_signal_insns(address); |
| } |
| return 0; |
| } |
| |
| static inline void handle_signal32(struct ksignal *ksig, |
| struct pt_regs *regs) |
| { |
| sigset_t *oldset = sigmask_to_save(); |
| int err; |
| |
| if (ksig->ka.sa.sa_flags & SA_SIGINFO) |
| err = setup_rt_frame32(ksig, regs, oldset); |
| else |
| err = setup_frame32(ksig, regs, oldset); |
| |
| signal_setup_done(err, ksig, 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(struct pt_regs * regs) |
| { |
| struct ksignal ksig; |
| unsigned long orig_i0 = 0; |
| int restart_syscall = 0; |
| bool has_handler = get_signal(&ksig); |
| |
| if (pt_regs_is_syscall(regs) && |
| (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) { |
| restart_syscall = 1; |
| orig_i0 = regs->u_regs[UREG_G6]; |
| } |
| |
| if (has_handler) { |
| if (restart_syscall) |
| syscall_restart32(orig_i0, regs, &ksig.ka.sa); |
| handle_signal32(&ksig, regs); |
| } else { |
| if (restart_syscall) { |
| switch (regs->u_regs[UREG_I0]) { |
| case ERESTARTNOHAND: |
| case ERESTARTSYS: |
| case 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); |
| /* fall through */ |
| case ERESTART_RESTARTBLOCK: |
| regs->u_regs[UREG_G1] = __NR_restart_syscall; |
| regs->tpc -= 4; |
| regs->tnpc -= 4; |
| pt_regs_clear_syscall(regs); |
| } |
| } |
| restore_saved_sigmask(); |
| } |
| } |
| |
| 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; |
| } |