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authorAl Viro <viro@ftp.linux.org.uk>2011-08-18 20:03:19 +0100
committerRichard Weinberger <richard@nod.at>2011-11-02 14:14:51 +0100
commit6582b7f7743da6ce3e3714e9e8b18e0e073d4acd (patch)
tree649346d2333865ccd4bb4d560ceb50c39139c5c2 /arch/um/sys-i386/signal.c
parent858ba94499b4f48e9eb0be7cf0092f1ea9460fef (diff)
downloadblackbird-op-linux-6582b7f7743da6ce3e3714e9e8b18e0e073d4acd.tar.gz
blackbird-op-linux-6582b7f7743da6ce3e3714e9e8b18e0e073d4acd.zip
um: merge arch/um/sys-{i386,x86_64}
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um/sys-i386/signal.c')
-rw-r--r--arch/um/sys-i386/signal.c498
1 files changed, 0 insertions, 498 deletions
diff --git a/arch/um/sys-i386/signal.c b/arch/um/sys-i386/signal.c
deleted file mode 100644
index bcbfb0d64813..000000000000
--- a/arch/um/sys-i386/signal.c
+++ /dev/null
@@ -1,498 +0,0 @@
-/*
- * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- * Licensed under the GPL
- */
-
-#include <linux/ptrace.h>
-#include <asm/unistd.h>
-#include <asm/uaccess.h>
-#include <asm/ucontext.h>
-#include "frame_kern.h"
-#include "skas.h"
-
-/*
- * FPU tag word conversions.
- */
-
-static inline unsigned short twd_i387_to_fxsr(unsigned short twd)
-{
- unsigned int tmp; /* to avoid 16 bit prefixes in the code */
-
- /* Transform each pair of bits into 01 (valid) or 00 (empty) */
- tmp = ~twd;
- tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
- /* and move the valid bits to the lower byte. */
- tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */
- tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */
- tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */
- return tmp;
-}
-
-static inline unsigned long twd_fxsr_to_i387(struct user_fxsr_struct *fxsave)
-{
- struct _fpxreg *st = NULL;
- unsigned long twd = (unsigned long) fxsave->twd;
- unsigned long tag;
- unsigned long ret = 0xffff0000;
- int i;
-
-#define FPREG_ADDR(f, n) ((char *)&(f)->st_space + (n) * 16)
-
- for (i = 0; i < 8; i++) {
- if (twd & 0x1) {
- st = (struct _fpxreg *) FPREG_ADDR(fxsave, i);
-
- switch (st->exponent & 0x7fff) {
- case 0x7fff:
- tag = 2; /* Special */
- break;
- case 0x0000:
- if ( !st->significand[0] &&
- !st->significand[1] &&
- !st->significand[2] &&
- !st->significand[3] ) {
- tag = 1; /* Zero */
- } else {
- tag = 2; /* Special */
- }
- break;
- default:
- if (st->significand[3] & 0x8000) {
- tag = 0; /* Valid */
- } else {
- tag = 2; /* Special */
- }
- break;
- }
- } else {
- tag = 3; /* Empty */
- }
- ret |= (tag << (2 * i));
- twd = twd >> 1;
- }
- return ret;
-}
-
-static int convert_fxsr_to_user(struct _fpstate __user *buf,
- struct user_fxsr_struct *fxsave)
-{
- unsigned long env[7];
- struct _fpreg __user *to;
- struct _fpxreg *from;
- int i;
-
- env[0] = (unsigned long)fxsave->cwd | 0xffff0000ul;
- env[1] = (unsigned long)fxsave->swd | 0xffff0000ul;
- env[2] = twd_fxsr_to_i387(fxsave);
- env[3] = fxsave->fip;
- env[4] = fxsave->fcs | ((unsigned long)fxsave->fop << 16);
- env[5] = fxsave->foo;
- env[6] = fxsave->fos;
-
- if (__copy_to_user(buf, env, 7 * sizeof(unsigned long)))
- return 1;
-
- to = &buf->_st[0];
- from = (struct _fpxreg *) &fxsave->st_space[0];
- for (i = 0; i < 8; i++, to++, from++) {
- unsigned long __user *t = (unsigned long __user *)to;
- unsigned long *f = (unsigned long *)from;
-
- if (__put_user(*f, t) ||
- __put_user(*(f + 1), t + 1) ||
- __put_user(from->exponent, &to->exponent))
- return 1;
- }
- return 0;
-}
-
-static int convert_fxsr_from_user(struct user_fxsr_struct *fxsave,
- struct _fpstate __user *buf)
-{
- unsigned long env[7];
- struct _fpxreg *to;
- struct _fpreg __user *from;
- int i;
-
- if (copy_from_user( env, buf, 7 * sizeof(long)))
- return 1;
-
- fxsave->cwd = (unsigned short)(env[0] & 0xffff);
- fxsave->swd = (unsigned short)(env[1] & 0xffff);
- fxsave->twd = twd_i387_to_fxsr((unsigned short)(env[2] & 0xffff));
- fxsave->fip = env[3];
- fxsave->fop = (unsigned short)((env[4] & 0xffff0000ul) >> 16);
- fxsave->fcs = (env[4] & 0xffff);
- fxsave->foo = env[5];
- fxsave->fos = env[6];
-
- to = (struct _fpxreg *) &fxsave->st_space[0];
- from = &buf->_st[0];
- for (i = 0; i < 8; i++, to++, from++) {
- unsigned long *t = (unsigned long *)to;
- unsigned long __user *f = (unsigned long __user *)from;
-
- if (__get_user(*t, f) ||
- __get_user(*(t + 1), f + 1) ||
- __get_user(to->exponent, &from->exponent))
- return 1;
- }
- return 0;
-}
-
-extern int have_fpx_regs;
-
-static int copy_sc_from_user(struct pt_regs *regs,
- struct sigcontext __user *from)
-{
- struct sigcontext sc;
- int err, pid;
-
- err = copy_from_user(&sc, from, sizeof(sc));
- if (err)
- return err;
-
- pid = userspace_pid[current_thread_info()->cpu];
-
-#define GETREG(regno, regname) regs->regs.gp[HOST_##regno] = sc.regname
-
- GETREG(GS, gs);
- GETREG(FS, fs);
- GETREG(ES, es);
- GETREG(DS, ds);
- GETREG(EDI, di);
- GETREG(ESI, si);
- GETREG(EBP, bp);
- GETREG(SP, sp);
- GETREG(EBX, bx);
- GETREG(EDX, dx);
- GETREG(ECX, cx);
- GETREG(EAX, ax);
- GETREG(IP, ip);
- GETREG(CS, cs);
- GETREG(EFLAGS, flags);
- GETREG(SS, ss);
-
-#undef GETREG
- if (have_fpx_regs) {
- struct user_fxsr_struct fpx;
-
- err = copy_from_user(&fpx,
- &((struct _fpstate __user *)sc.fpstate)->_fxsr_env[0],
- sizeof(struct user_fxsr_struct));
- if (err)
- return 1;
-
- err = convert_fxsr_from_user(&fpx, sc.fpstate);
- if (err)
- return 1;
-
- err = restore_fpx_registers(pid, (unsigned long *) &fpx);
- if (err < 0) {
- printk(KERN_ERR "copy_sc_from_user - "
- "restore_fpx_registers failed, errno = %d\n",
- -err);
- return 1;
- }
- } else {
- struct user_i387_struct fp;
-
- err = copy_from_user(&fp, sc.fpstate,
- sizeof(struct user_i387_struct));
- if (err)
- return 1;
-
- err = restore_fp_registers(pid, (unsigned long *) &fp);
- if (err < 0) {
- printk(KERN_ERR "copy_sc_from_user - "
- "restore_fp_registers failed, errno = %d\n",
- -err);
- return 1;
- }
- }
-
- return 0;
-}
-
-static int copy_sc_to_user(struct sigcontext __user *to,
- struct _fpstate __user *to_fp, struct pt_regs *regs,
- unsigned long sp)
-{
- struct sigcontext sc;
- struct faultinfo * fi = &current->thread.arch.faultinfo;
- int err, pid;
- memset(&sc, 0, sizeof(struct sigcontext));
-
- sc.gs = REGS_GS(regs->regs.gp);
- sc.fs = REGS_FS(regs->regs.gp);
- sc.es = REGS_ES(regs->regs.gp);
- sc.ds = REGS_DS(regs->regs.gp);
- sc.di = REGS_EDI(regs->regs.gp);
- sc.si = REGS_ESI(regs->regs.gp);
- sc.bp = REGS_EBP(regs->regs.gp);
- sc.sp = sp;
- sc.bx = REGS_EBX(regs->regs.gp);
- sc.dx = REGS_EDX(regs->regs.gp);
- sc.cx = REGS_ECX(regs->regs.gp);
- sc.ax = REGS_EAX(regs->regs.gp);
- sc.ip = REGS_IP(regs->regs.gp);
- sc.cs = REGS_CS(regs->regs.gp);
- sc.flags = REGS_EFLAGS(regs->regs.gp);
- sc.sp_at_signal = regs->regs.gp[UESP];
- sc.ss = regs->regs.gp[SS];
- sc.cr2 = fi->cr2;
- sc.err = fi->error_code;
- sc.trapno = fi->trap_no;
-
- to_fp = (to_fp ? to_fp : (struct _fpstate __user *) (to + 1));
- sc.fpstate = to_fp;
-
- pid = userspace_pid[current_thread_info()->cpu];
- if (have_fpx_regs) {
- struct user_fxsr_struct fpx;
-
- err = save_fpx_registers(pid, (unsigned long *) &fpx);
- if (err < 0){
- printk(KERN_ERR "copy_sc_to_user - save_fpx_registers "
- "failed, errno = %d\n", err);
- return 1;
- }
-
- err = convert_fxsr_to_user(to_fp, &fpx);
- if (err)
- return 1;
-
- err |= __put_user(fpx.swd, &to_fp->status);
- err |= __put_user(X86_FXSR_MAGIC, &to_fp->magic);
- if (err)
- return 1;
-
- if (copy_to_user(&to_fp->_fxsr_env[0], &fpx,
- sizeof(struct user_fxsr_struct)))
- return 1;
- }
- else {
- struct user_i387_struct fp;
-
- err = save_fp_registers(pid, (unsigned long *) &fp);
- if (copy_to_user(to_fp, &fp, sizeof(struct user_i387_struct)))
- return 1;
- }
-
- return copy_to_user(to, &sc, sizeof(sc));
-}
-
-static int copy_ucontext_to_user(struct ucontext __user *uc,
- struct _fpstate __user *fp, sigset_t *set,
- unsigned long sp)
-{
- int err = 0;
-
- err |= put_user(current->sas_ss_sp, &uc->uc_stack.ss_sp);
- err |= put_user(sas_ss_flags(sp), &uc->uc_stack.ss_flags);
- err |= put_user(current->sas_ss_size, &uc->uc_stack.ss_size);
- err |= copy_sc_to_user(&uc->uc_mcontext, fp, &current->thread.regs, sp);
- err |= copy_to_user(&uc->uc_sigmask, set, sizeof(*set));
- return err;
-}
-
-struct sigframe
-{
- char __user *pretcode;
- int sig;
- struct sigcontext sc;
- struct _fpstate fpstate;
- unsigned long extramask[_NSIG_WORDS-1];
- char retcode[8];
-};
-
-struct rt_sigframe
-{
- char __user *pretcode;
- int sig;
- struct siginfo __user *pinfo;
- void __user *puc;
- struct siginfo info;
- struct ucontext uc;
- struct _fpstate fpstate;
- char retcode[8];
-};
-
-int setup_signal_stack_sc(unsigned long stack_top, int sig,
- struct k_sigaction *ka, struct pt_regs *regs,
- sigset_t *mask)
-{
- struct sigframe __user *frame;
- void __user *restorer;
- unsigned long save_sp = PT_REGS_SP(regs);
- int err = 0;
-
- /* This is the same calculation as i386 - ((sp + 4) & 15) == 0 */
- stack_top = ((stack_top + 4) & -16UL) - 4;
- frame = (struct sigframe __user *) stack_top - 1;
- if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- return 1;
-
- restorer = frame->retcode;
- if (ka->sa.sa_flags & SA_RESTORER)
- restorer = ka->sa.sa_restorer;
-
- /* Update SP now because the page fault handler refuses to extend
- * the stack if the faulting address is too far below the current
- * SP, which frame now certainly is. If there's an error, the original
- * value is restored on the way out.
- * When writing the sigcontext to the stack, we have to write the
- * original value, so that's passed to copy_sc_to_user, which does
- * the right thing with it.
- */
- PT_REGS_SP(regs) = (unsigned long) frame;
-
- err |= __put_user(restorer, &frame->pretcode);
- err |= __put_user(sig, &frame->sig);
- err |= copy_sc_to_user(&frame->sc, NULL, regs, save_sp);
- err |= __put_user(mask->sig[0], &frame->sc.oldmask);
- if (_NSIG_WORDS > 1)
- err |= __copy_to_user(&frame->extramask, &mask->sig[1],
- sizeof(frame->extramask));
-
- /*
- * This is popl %eax ; movl $,%eax ; int $0x80
- *
- * WE DO NOT USE IT ANY MORE! It's only left here for historical
- * reasons and because gdb uses it as a signature to notice
- * signal handler stack frames.
- */
- err |= __put_user(0xb858, (short __user *)(frame->retcode+0));
- err |= __put_user(__NR_sigreturn, (int __user *)(frame->retcode+2));
- err |= __put_user(0x80cd, (short __user *)(frame->retcode+6));
-
- if (err)
- goto err;
-
- PT_REGS_SP(regs) = (unsigned long) frame;
- PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler;
- PT_REGS_EAX(regs) = (unsigned long) sig;
- PT_REGS_EDX(regs) = (unsigned long) 0;
- PT_REGS_ECX(regs) = (unsigned long) 0;
-
- if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED))
- ptrace_notify(SIGTRAP);
- return 0;
-
-err:
- PT_REGS_SP(regs) = save_sp;
- return err;
-}
-
-int setup_signal_stack_si(unsigned long stack_top, int sig,
- struct k_sigaction *ka, struct pt_regs *regs,
- siginfo_t *info, sigset_t *mask)
-{
- struct rt_sigframe __user *frame;
- void __user *restorer;
- unsigned long save_sp = PT_REGS_SP(regs);
- int err = 0;
-
- stack_top &= -8UL;
- frame = (struct rt_sigframe __user *) stack_top - 1;
- if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
- return 1;
-
- restorer = frame->retcode;
- if (ka->sa.sa_flags & SA_RESTORER)
- restorer = ka->sa.sa_restorer;
-
- /* See comment above about why this is here */
- PT_REGS_SP(regs) = (unsigned long) frame;
-
- err |= __put_user(restorer, &frame->pretcode);
- err |= __put_user(sig, &frame->sig);
- err |= __put_user(&frame->info, &frame->pinfo);
- err |= __put_user(&frame->uc, &frame->puc);
- err |= copy_siginfo_to_user(&frame->info, info);
- err |= copy_ucontext_to_user(&frame->uc, &frame->fpstate, mask,
- save_sp);
-
- /*
- * This is movl $,%eax ; int $0x80
- *
- * WE DO NOT USE IT ANY MORE! It's only left here for historical
- * reasons and because gdb uses it as a signature to notice
- * signal handler stack frames.
- */
- err |= __put_user(0xb8, (char __user *)(frame->retcode+0));
- err |= __put_user(__NR_rt_sigreturn, (int __user *)(frame->retcode+1));
- err |= __put_user(0x80cd, (short __user *)(frame->retcode+5));
-
- if (err)
- goto err;
-
- PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler;
- PT_REGS_EAX(regs) = (unsigned long) sig;
- PT_REGS_EDX(regs) = (unsigned long) &frame->info;
- PT_REGS_ECX(regs) = (unsigned long) &frame->uc;
-
- if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED))
- ptrace_notify(SIGTRAP);
- return 0;
-
-err:
- PT_REGS_SP(regs) = save_sp;
- return err;
-}
-
-long sys_sigreturn(struct pt_regs regs)
-{
- unsigned long sp = PT_REGS_SP(&current->thread.regs);
- struct sigframe __user *frame = (struct sigframe __user *)(sp - 8);
- sigset_t set;
- struct sigcontext __user *sc = &frame->sc;
- unsigned long __user *oldmask = &sc->oldmask;
- unsigned long __user *extramask = frame->extramask;
- int sig_size = (_NSIG_WORDS - 1) * sizeof(unsigned long);
-
- if (copy_from_user(&set.sig[0], oldmask, sizeof(set.sig[0])) ||
- copy_from_user(&set.sig[1], extramask, sig_size))
- goto segfault;
-
- sigdelsetmask(&set, ~_BLOCKABLE);
- set_current_blocked(&set);
-
- if (copy_sc_from_user(&current->thread.regs, sc))
- goto segfault;
-
- /* Avoid ERESTART handling */
- PT_REGS_SYSCALL_NR(&current->thread.regs) = -1;
- return PT_REGS_SYSCALL_RET(&current->thread.regs);
-
- segfault:
- force_sig(SIGSEGV, current);
- return 0;
-}
-
-long sys_rt_sigreturn(struct pt_regs regs)
-{
- unsigned long sp = PT_REGS_SP(&current->thread.regs);
- struct rt_sigframe __user *frame =
- (struct rt_sigframe __user *) (sp - 4);
- sigset_t set;
- struct ucontext __user *uc = &frame->uc;
- int sig_size = _NSIG_WORDS * sizeof(unsigned long);
-
- if (copy_from_user(&set, &uc->uc_sigmask, sig_size))
- goto segfault;
-
- sigdelsetmask(&set, ~_BLOCKABLE);
- set_current_blocked(&set);
-
- if (copy_sc_from_user(&current->thread.regs, &uc->uc_mcontext))
- goto segfault;
-
- /* Avoid ERESTART handling */
- PT_REGS_SYSCALL_NR(&current->thread.regs) = -1;
- return PT_REGS_SYSCALL_RET(&current->thread.regs);
-
- segfault:
- force_sig(SIGSEGV, current);
- return 0;
-}
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