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558 lines
17 KiB
558 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* arch/sparc64/kernel/signal.c |
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* |
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* Copyright (C) 1991, 1992 Linus Torvalds |
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* Copyright (C) 1995, 2008 David S. Miller ([email protected]) |
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* Copyright (C) 1996 Miguel de Icaza ([email protected]) |
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* Copyright (C) 1997 Eddie C. Dost ([email protected]) |
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* Copyright (C) 1997,1998 Jakub Jelinek ([email protected]) |
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*/ |
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|
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#include <linux/sched.h> |
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#include <linux/kernel.h> |
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#include <linux/signal.h> |
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#include <linux/errno.h> |
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#include <linux/wait.h> |
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#include <linux/ptrace.h> |
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#include <linux/tracehook.h> |
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#include <linux/unistd.h> |
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#include <linux/mm.h> |
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#include <linux/tty.h> |
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#include <linux/binfmts.h> |
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#include <linux/bitops.h> |
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#include <linux/context_tracking.h> |
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|
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#include <linux/uaccess.h> |
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#include <asm/ptrace.h> |
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#include <asm/fpumacro.h> |
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#include <asm/uctx.h> |
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#include <asm/siginfo.h> |
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#include <asm/visasm.h> |
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#include <asm/switch_to.h> |
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#include <asm/cacheflush.h> |
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|
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#include "sigutil.h" |
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#include "systbls.h" |
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#include "kernel.h" |
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#include "entry.h" |
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|
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/* {set, get}context() needed for 64-bit SparcLinux userland. */ |
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asmlinkage void sparc64_set_context(struct pt_regs *regs) |
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{ |
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struct ucontext __user *ucp = (struct ucontext __user *) |
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regs->u_regs[UREG_I0]; |
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enum ctx_state prev_state = exception_enter(); |
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mc_gregset_t __user *grp; |
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unsigned long pc, npc, tstate; |
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unsigned long fp, i7; |
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unsigned char fenab; |
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int err; |
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synchronize_user_stack(); |
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if (get_thread_wsaved() || |
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(((unsigned long)ucp) & (sizeof(unsigned long)-1)) || |
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(!__access_ok(ucp, sizeof(*ucp)))) |
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goto do_sigsegv; |
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grp = &ucp->uc_mcontext.mc_gregs; |
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err = __get_user(pc, &((*grp)[MC_PC])); |
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err |= __get_user(npc, &((*grp)[MC_NPC])); |
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if (err || ((pc | npc) & 3)) |
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goto do_sigsegv; |
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if (regs->u_regs[UREG_I1]) { |
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sigset_t set; |
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if (_NSIG_WORDS == 1) { |
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if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0])) |
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goto do_sigsegv; |
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} else { |
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if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t))) |
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goto do_sigsegv; |
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} |
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set_current_blocked(&set); |
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} |
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if (test_thread_flag(TIF_32BIT)) { |
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pc &= 0xffffffff; |
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npc &= 0xffffffff; |
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} |
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regs->tpc = pc; |
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regs->tnpc = npc; |
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err |= __get_user(regs->y, &((*grp)[MC_Y])); |
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err |= __get_user(tstate, &((*grp)[MC_TSTATE])); |
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regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); |
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regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); |
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err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1])); |
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err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2])); |
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err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3])); |
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err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4])); |
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err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5])); |
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err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6])); |
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/* Skip %g7 as that's the thread register in userspace. */ |
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err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0])); |
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err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1])); |
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err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2])); |
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err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3])); |
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err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4])); |
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err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5])); |
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err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6])); |
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err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7])); |
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err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp)); |
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err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7)); |
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err |= __put_user(fp, |
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(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); |
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err |= __put_user(i7, |
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(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); |
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err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab)); |
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if (fenab) { |
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unsigned long *fpregs = current_thread_info()->fpregs; |
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unsigned long fprs; |
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fprs_write(0); |
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err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs)); |
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if (fprs & FPRS_DL) |
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err |= copy_from_user(fpregs, |
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&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs), |
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(sizeof(unsigned int) * 32)); |
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if (fprs & FPRS_DU) |
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err |= copy_from_user(fpregs+16, |
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((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16, |
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(sizeof(unsigned int) * 32)); |
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err |= __get_user(current_thread_info()->xfsr[0], |
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&(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr)); |
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err |= __get_user(current_thread_info()->gsr[0], |
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&(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr)); |
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regs->tstate &= ~TSTATE_PEF; |
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} |
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if (err) |
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goto do_sigsegv; |
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out: |
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exception_exit(prev_state); |
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return; |
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do_sigsegv: |
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force_sig(SIGSEGV); |
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goto out; |
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} |
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asmlinkage void sparc64_get_context(struct pt_regs *regs) |
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{ |
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struct ucontext __user *ucp = (struct ucontext __user *) |
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regs->u_regs[UREG_I0]; |
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enum ctx_state prev_state = exception_enter(); |
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mc_gregset_t __user *grp; |
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mcontext_t __user *mcp; |
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unsigned long fp, i7; |
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unsigned char fenab; |
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int err; |
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synchronize_user_stack(); |
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if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp))) |
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goto do_sigsegv; |
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#if 1 |
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fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */ |
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#else |
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fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF); |
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#endif |
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mcp = &ucp->uc_mcontext; |
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grp = &mcp->mc_gregs; |
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/* Skip over the trap instruction, first. */ |
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if (test_thread_flag(TIF_32BIT)) { |
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regs->tpc = (regs->tnpc & 0xffffffff); |
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regs->tnpc = (regs->tnpc + 4) & 0xffffffff; |
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} else { |
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regs->tpc = regs->tnpc; |
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regs->tnpc += 4; |
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} |
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err = 0; |
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if (_NSIG_WORDS == 1) |
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err |= __put_user(current->blocked.sig[0], |
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(unsigned long __user *)&ucp->uc_sigmask); |
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else |
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err |= __copy_to_user(&ucp->uc_sigmask, ¤t->blocked, |
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sizeof(sigset_t)); |
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err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE])); |
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err |= __put_user(regs->tpc, &((*grp)[MC_PC])); |
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err |= __put_user(regs->tnpc, &((*grp)[MC_NPC])); |
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err |= __put_user(regs->y, &((*grp)[MC_Y])); |
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err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1])); |
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err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2])); |
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err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3])); |
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err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4])); |
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err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5])); |
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err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6])); |
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err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7])); |
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err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0])); |
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err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1])); |
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err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2])); |
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err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3])); |
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err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4])); |
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err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5])); |
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err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6])); |
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err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7])); |
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err |= __get_user(fp, |
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(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6]))); |
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err |= __get_user(i7, |
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(&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7]))); |
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err |= __put_user(fp, &(mcp->mc_fp)); |
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err |= __put_user(i7, &(mcp->mc_i7)); |
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err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab)); |
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if (fenab) { |
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unsigned long *fpregs = current_thread_info()->fpregs; |
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unsigned long fprs; |
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fprs = current_thread_info()->fpsaved[0]; |
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if (fprs & FPRS_DL) |
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err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs, |
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(sizeof(unsigned int) * 32)); |
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if (fprs & FPRS_DU) |
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err |= copy_to_user( |
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((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16, |
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(sizeof(unsigned int) * 32)); |
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err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr)); |
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err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr)); |
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err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs)); |
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} |
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if (err) |
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goto do_sigsegv; |
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out: |
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exception_exit(prev_state); |
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return; |
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do_sigsegv: |
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force_sig(SIGSEGV); |
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goto out; |
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} |
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|
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/* Checks if the fp is valid. We always build rt signal frames which |
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* are 16-byte aligned, therefore we can always enforce that the |
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* restore frame has that property as well. |
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*/ |
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static bool invalid_frame_pointer(void __user *fp) |
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{ |
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if (((unsigned long) fp) & 15) |
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return true; |
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return false; |
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} |
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struct rt_signal_frame { |
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struct sparc_stackf ss; |
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siginfo_t info; |
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struct pt_regs regs; |
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__siginfo_fpu_t __user *fpu_save; |
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stack_t stack; |
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sigset_t mask; |
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__siginfo_rwin_t *rwin_save; |
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}; |
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void do_rt_sigreturn(struct pt_regs *regs) |
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{ |
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unsigned long tpc, tnpc, tstate, ufp; |
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struct rt_signal_frame __user *sf; |
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__siginfo_fpu_t __user *fpu_save; |
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__siginfo_rwin_t __user *rwin_save; |
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sigset_t set; |
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int err; |
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/* Always make any pending restarted system calls return -EINTR */ |
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current->restart_block.fn = do_no_restart_syscall; |
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synchronize_user_stack (); |
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sf = (struct rt_signal_frame __user *) |
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(regs->u_regs [UREG_FP] + STACK_BIAS); |
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/* 1. Make sure we are not getting garbage from the user */ |
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if (invalid_frame_pointer(sf)) |
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goto segv; |
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if (get_user(ufp, &sf->regs.u_regs[UREG_FP])) |
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goto segv; |
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if ((ufp + STACK_BIAS) & 0x7) |
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goto segv; |
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err = __get_user(tpc, &sf->regs.tpc); |
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err |= __get_user(tnpc, &sf->regs.tnpc); |
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if (test_thread_flag(TIF_32BIT)) { |
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tpc &= 0xffffffff; |
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tnpc &= 0xffffffff; |
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} |
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err |= ((tpc | tnpc) & 3); |
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/* 2. Restore the state */ |
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err |= __get_user(regs->y, &sf->regs.y); |
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err |= __get_user(tstate, &sf->regs.tstate); |
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err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs)); |
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/* User can only change condition codes and %asi in %tstate. */ |
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regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC); |
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regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC)); |
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err |= __get_user(fpu_save, &sf->fpu_save); |
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if (!err && fpu_save) |
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err |= restore_fpu_state(regs, fpu_save); |
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err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t)); |
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err |= restore_altstack(&sf->stack); |
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if (err) |
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goto segv; |
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err |= __get_user(rwin_save, &sf->rwin_save); |
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if (!err && rwin_save) { |
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if (restore_rwin_state(rwin_save)) |
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goto segv; |
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} |
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regs->tpc = tpc; |
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regs->tnpc = tnpc; |
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/* Prevent syscall restart. */ |
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pt_regs_clear_syscall(regs); |
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set_current_blocked(&set); |
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return; |
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segv: |
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force_sig(SIGSEGV); |
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} |
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static inline void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize) |
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{ |
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unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS; |
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/* |
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* If we are on the alternate signal stack and would overflow it, don't. |
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* Return an always-bogus address instead so we will die with SIGSEGV. |
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*/ |
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if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize))) |
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return (void __user *) -1L; |
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/* This is the X/Open sanctioned signal stack switching. */ |
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sp = sigsp(sp, ksig) - framesize; |
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/* Always align the stack frame. This handles two cases. First, |
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* sigaltstack need not be mindful of platform specific stack |
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* alignment. Second, if we took this signal because the stack |
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* is not aligned properly, we'd like to take the signal cleanly |
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* and report that. |
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*/ |
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sp &= ~15UL; |
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return (void __user *) sp; |
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} |
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static inline int |
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setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs) |
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{ |
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struct rt_signal_frame __user *sf; |
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int wsaved, err, sf_size; |
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void __user *tail; |
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/* 1. Make sure everything is clean */ |
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synchronize_user_stack(); |
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save_and_clear_fpu(); |
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wsaved = get_thread_wsaved(); |
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sf_size = sizeof(struct rt_signal_frame); |
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if (current_thread_info()->fpsaved[0] & FPRS_FEF) |
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sf_size += sizeof(__siginfo_fpu_t); |
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if (wsaved) |
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sf_size += sizeof(__siginfo_rwin_t); |
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sf = (struct rt_signal_frame __user *) |
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get_sigframe(ksig, regs, sf_size); |
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if (invalid_frame_pointer (sf)) { |
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if (show_unhandled_signals) |
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pr_info("%s[%d] bad frame in setup_rt_frame: %016lx TPC %016lx O7 %016lx\n", |
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current->comm, current->pid, (unsigned long)sf, |
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regs->tpc, regs->u_regs[UREG_I7]); |
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force_sigsegv(ksig->sig); |
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return -EINVAL; |
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} |
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tail = (sf + 1); |
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/* 2. Save the current process state */ |
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err = copy_to_user(&sf->regs, regs, sizeof (*regs)); |
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if (current_thread_info()->fpsaved[0] & FPRS_FEF) { |
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__siginfo_fpu_t __user *fpu_save = tail; |
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tail += sizeof(__siginfo_fpu_t); |
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err |= save_fpu_state(regs, fpu_save); |
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err |= __put_user((u64)fpu_save, &sf->fpu_save); |
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} else { |
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err |= __put_user(0, &sf->fpu_save); |
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} |
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if (wsaved) { |
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__siginfo_rwin_t __user *rwin_save = tail; |
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tail += sizeof(__siginfo_rwin_t); |
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err |= save_rwin_state(wsaved, rwin_save); |
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err |= __put_user((u64)rwin_save, &sf->rwin_save); |
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set_thread_wsaved(0); |
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} else { |
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err |= __put_user(0, &sf->rwin_save); |
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} |
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|
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/* Setup sigaltstack */ |
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err |= __save_altstack(&sf->stack, regs->u_regs[UREG_FP]); |
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|
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err |= copy_to_user(&sf->mask, sigmask_to_save(), sizeof(sigset_t)); |
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|
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if (!wsaved) { |
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err |= copy_in_user((u64 __user *)sf, |
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(u64 __user *)(regs->u_regs[UREG_FP] + |
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STACK_BIAS), |
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sizeof(struct reg_window)); |
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} else { |
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struct reg_window *rp; |
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|
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rp = ¤t_thread_info()->reg_window[wsaved - 1]; |
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err |= copy_to_user(sf, rp, sizeof(struct reg_window)); |
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} |
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if (ksig->ka.sa.sa_flags & SA_SIGINFO) |
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err |= copy_siginfo_to_user(&sf->info, &ksig->info); |
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else { |
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err |= __put_user(ksig->sig, &sf->info.si_signo); |
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err |= __put_user(SI_NOINFO, &sf->info.si_code); |
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} |
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if (err) |
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return err; |
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|
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/* 3. signal handler back-trampoline and parameters */ |
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regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS; |
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regs->u_regs[UREG_I0] = ksig->sig; |
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regs->u_regs[UREG_I1] = (unsigned long) &sf->info; |
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|
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/* The sigcontext is passed in this way because of how it |
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* is defined in GLIBC's /usr/include/bits/sigcontext.h |
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* for sparc64. It includes the 128 bytes of siginfo_t. |
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*/ |
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regs->u_regs[UREG_I2] = (unsigned long) &sf->info; |
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|
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/* 5. signal handler */ |
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regs->tpc = (unsigned long) ksig->ka.sa.sa_handler; |
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regs->tnpc = (regs->tpc + 4); |
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if (test_thread_flag(TIF_32BIT)) { |
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regs->tpc &= 0xffffffff; |
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regs->tnpc &= 0xffffffff; |
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} |
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/* 4. return to kernel instructions */ |
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regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer; |
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return 0; |
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} |
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|
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static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs, |
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struct sigaction *sa) |
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{ |
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switch (regs->u_regs[UREG_I0]) { |
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case ERESTART_RESTARTBLOCK: |
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case ERESTARTNOHAND: |
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no_system_call_restart: |
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regs->u_regs[UREG_I0] = EINTR; |
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regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY); |
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break; |
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case ERESTARTSYS: |
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if (!(sa->sa_flags & SA_RESTART)) |
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goto no_system_call_restart; |
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fallthrough; |
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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. |
|
*/ |
|
static void do_signal(struct pt_regs *regs, unsigned long orig_i0) |
|
{ |
|
struct ksignal ksig; |
|
int restart_syscall; |
|
bool has_handler; |
|
|
|
/* It's a lot of work and synchronization to add a new ptrace |
|
* register for GDB to save and restore in order to get |
|
* orig_i0 correct for syscall restarts when debugging. |
|
* |
|
* Although it should be the case that most of the global |
|
* registers are volatile across a system call, glibc already |
|
* depends upon that fact that we preserve them. So we can't |
|
* just use any global register to save away the orig_i0 value. |
|
* |
|
* In particular %g2, %g3, %g4, and %g5 are all assumed to be |
|
* preserved across a system call trap by various pieces of |
|
* code in glibc. |
|
* |
|
* %g7 is used as the "thread register". %g6 is not used in |
|
* any fixed manner. %g6 is used as a scratch register and |
|
* a compiler temporary, but it's value is never used across |
|
* a system call. Therefore %g6 is usable for orig_i0 storage. |
|
*/ |
|
if (pt_regs_is_syscall(regs) && |
|
(regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) |
|
regs->u_regs[UREG_G6] = orig_i0; |
|
|
|
#ifdef CONFIG_COMPAT |
|
if (test_thread_flag(TIF_32BIT)) { |
|
do_signal32(regs); |
|
return; |
|
} |
|
#endif |
|
|
|
has_handler = get_signal(&ksig); |
|
|
|
restart_syscall = 0; |
|
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_restart(orig_i0, regs, &ksig.ka.sa); |
|
signal_setup_done(setup_rt_frame(&ksig, regs), &ksig, 0); |
|
} 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); |
|
fallthrough; |
|
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(); |
|
} |
|
} |
|
|
|
void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags) |
|
{ |
|
user_exit(); |
|
if (thread_info_flags & _TIF_UPROBE) |
|
uprobe_notify_resume(regs); |
|
if (thread_info_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL)) |
|
do_signal(regs, orig_i0); |
|
if (thread_info_flags & _TIF_NOTIFY_RESUME) |
|
tracehook_notify_resume(regs); |
|
user_enter(); |
|
} |
|
|
|
|