![Richard Weinberger](/assets/img/avatar_default.png)
Use the more generic functions get_signal() signal_setup_done() for signal delivery. Signed-off-by: Richard Weinberger <richard@nod.at>
600 lines
15 KiB
C
600 lines
15 KiB
C
/*
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* Copyright (C) 2003 PathScale, Inc.
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* Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include <linux/personality.h>
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#include <linux/ptrace.h>
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#include <linux/kernel.h>
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#include <asm/unistd.h>
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#include <asm/uaccess.h>
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#include <asm/ucontext.h>
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#include <frame_kern.h>
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#include <skas.h>
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#ifdef CONFIG_X86_32
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/*
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* FPU tag word conversions.
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*/
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static inline unsigned short twd_i387_to_fxsr(unsigned short twd)
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{
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unsigned int tmp; /* to avoid 16 bit prefixes in the code */
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/* Transform each pair of bits into 01 (valid) or 00 (empty) */
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tmp = ~twd;
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tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
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/* and move the valid bits to the lower byte. */
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tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */
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tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */
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tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */
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return tmp;
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}
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static inline unsigned long twd_fxsr_to_i387(struct user_fxsr_struct *fxsave)
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{
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struct _fpxreg *st = NULL;
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unsigned long twd = (unsigned long) fxsave->twd;
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unsigned long tag;
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unsigned long ret = 0xffff0000;
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int i;
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#define FPREG_ADDR(f, n) ((char *)&(f)->st_space + (n) * 16)
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for (i = 0; i < 8; i++) {
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if (twd & 0x1) {
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st = (struct _fpxreg *) FPREG_ADDR(fxsave, i);
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switch (st->exponent & 0x7fff) {
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case 0x7fff:
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tag = 2; /* Special */
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break;
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case 0x0000:
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if ( !st->significand[0] &&
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!st->significand[1] &&
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!st->significand[2] &&
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!st->significand[3] ) {
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tag = 1; /* Zero */
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} else {
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tag = 2; /* Special */
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}
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break;
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default:
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if (st->significand[3] & 0x8000) {
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tag = 0; /* Valid */
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} else {
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tag = 2; /* Special */
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}
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break;
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}
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} else {
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tag = 3; /* Empty */
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}
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ret |= (tag << (2 * i));
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twd = twd >> 1;
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}
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return ret;
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}
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static int convert_fxsr_to_user(struct _fpstate __user *buf,
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struct user_fxsr_struct *fxsave)
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{
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unsigned long env[7];
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struct _fpreg __user *to;
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struct _fpxreg *from;
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int i;
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env[0] = (unsigned long)fxsave->cwd | 0xffff0000ul;
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env[1] = (unsigned long)fxsave->swd | 0xffff0000ul;
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env[2] = twd_fxsr_to_i387(fxsave);
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env[3] = fxsave->fip;
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env[4] = fxsave->fcs | ((unsigned long)fxsave->fop << 16);
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env[5] = fxsave->foo;
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env[6] = fxsave->fos;
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if (__copy_to_user(buf, env, 7 * sizeof(unsigned long)))
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return 1;
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to = &buf->_st[0];
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from = (struct _fpxreg *) &fxsave->st_space[0];
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for (i = 0; i < 8; i++, to++, from++) {
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unsigned long __user *t = (unsigned long __user *)to;
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unsigned long *f = (unsigned long *)from;
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if (__put_user(*f, t) ||
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__put_user(*(f + 1), t + 1) ||
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__put_user(from->exponent, &to->exponent))
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return 1;
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}
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return 0;
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}
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static int convert_fxsr_from_user(struct user_fxsr_struct *fxsave,
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struct _fpstate __user *buf)
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{
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unsigned long env[7];
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struct _fpxreg *to;
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struct _fpreg __user *from;
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int i;
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if (copy_from_user( env, buf, 7 * sizeof(long)))
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return 1;
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fxsave->cwd = (unsigned short)(env[0] & 0xffff);
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fxsave->swd = (unsigned short)(env[1] & 0xffff);
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fxsave->twd = twd_i387_to_fxsr((unsigned short)(env[2] & 0xffff));
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fxsave->fip = env[3];
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fxsave->fop = (unsigned short)((env[4] & 0xffff0000ul) >> 16);
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fxsave->fcs = (env[4] & 0xffff);
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fxsave->foo = env[5];
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fxsave->fos = env[6];
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to = (struct _fpxreg *) &fxsave->st_space[0];
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from = &buf->_st[0];
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for (i = 0; i < 8; i++, to++, from++) {
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unsigned long *t = (unsigned long *)to;
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unsigned long __user *f = (unsigned long __user *)from;
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if (__get_user(*t, f) ||
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__get_user(*(t + 1), f + 1) ||
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__get_user(to->exponent, &from->exponent))
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return 1;
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}
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return 0;
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}
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extern int have_fpx_regs;
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#endif
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static int copy_sc_from_user(struct pt_regs *regs,
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struct sigcontext __user *from)
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{
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struct sigcontext sc;
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int err, pid;
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/* Always make any pending restarted system calls return -EINTR */
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current_thread_info()->restart_block.fn = do_no_restart_syscall;
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err = copy_from_user(&sc, from, sizeof(sc));
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if (err)
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return err;
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#define GETREG(regno, regname) regs->regs.gp[HOST_##regno] = sc.regname
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#ifdef CONFIG_X86_32
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GETREG(GS, gs);
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GETREG(FS, fs);
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GETREG(ES, es);
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GETREG(DS, ds);
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#endif
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GETREG(DI, di);
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GETREG(SI, si);
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GETREG(BP, bp);
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GETREG(SP, sp);
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GETREG(BX, bx);
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GETREG(DX, dx);
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GETREG(CX, cx);
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GETREG(AX, ax);
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GETREG(IP, ip);
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#ifdef CONFIG_X86_64
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GETREG(R8, r8);
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GETREG(R9, r9);
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GETREG(R10, r10);
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GETREG(R11, r11);
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GETREG(R12, r12);
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GETREG(R13, r13);
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GETREG(R14, r14);
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GETREG(R15, r15);
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#endif
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GETREG(CS, cs);
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GETREG(EFLAGS, flags);
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#ifdef CONFIG_X86_32
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GETREG(SS, ss);
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#endif
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#undef GETREG
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pid = userspace_pid[current_thread_info()->cpu];
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#ifdef CONFIG_X86_32
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if (have_fpx_regs) {
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struct user_fxsr_struct fpx;
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err = copy_from_user(&fpx,
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&((struct _fpstate __user *)sc.fpstate)->_fxsr_env[0],
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sizeof(struct user_fxsr_struct));
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if (err)
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return 1;
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err = convert_fxsr_from_user(&fpx, sc.fpstate);
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if (err)
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return 1;
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err = restore_fpx_registers(pid, (unsigned long *) &fpx);
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if (err < 0) {
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printk(KERN_ERR "copy_sc_from_user - "
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"restore_fpx_registers failed, errno = %d\n",
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-err);
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return 1;
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}
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} else
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#endif
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{
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struct user_i387_struct fp;
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err = copy_from_user(&fp, sc.fpstate,
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sizeof(struct user_i387_struct));
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if (err)
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return 1;
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err = restore_fp_registers(pid, (unsigned long *) &fp);
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if (err < 0) {
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printk(KERN_ERR "copy_sc_from_user - "
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"restore_fp_registers failed, errno = %d\n",
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-err);
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return 1;
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}
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}
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return 0;
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}
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static int copy_sc_to_user(struct sigcontext __user *to,
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struct _fpstate __user *to_fp, struct pt_regs *regs,
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unsigned long mask)
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{
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struct sigcontext sc;
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struct faultinfo * fi = ¤t->thread.arch.faultinfo;
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int err, pid;
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memset(&sc, 0, sizeof(struct sigcontext));
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#define PUTREG(regno, regname) sc.regname = regs->regs.gp[HOST_##regno]
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#ifdef CONFIG_X86_32
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PUTREG(GS, gs);
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PUTREG(FS, fs);
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PUTREG(ES, es);
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PUTREG(DS, ds);
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#endif
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PUTREG(DI, di);
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PUTREG(SI, si);
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PUTREG(BP, bp);
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PUTREG(SP, sp);
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PUTREG(BX, bx);
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PUTREG(DX, dx);
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PUTREG(CX, cx);
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PUTREG(AX, ax);
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#ifdef CONFIG_X86_64
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PUTREG(R8, r8);
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PUTREG(R9, r9);
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PUTREG(R10, r10);
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PUTREG(R11, r11);
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PUTREG(R12, r12);
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PUTREG(R13, r13);
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PUTREG(R14, r14);
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PUTREG(R15, r15);
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#endif
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sc.cr2 = fi->cr2;
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sc.err = fi->error_code;
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sc.trapno = fi->trap_no;
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PUTREG(IP, ip);
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PUTREG(CS, cs);
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PUTREG(EFLAGS, flags);
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#ifdef CONFIG_X86_32
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PUTREG(SP, sp_at_signal);
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PUTREG(SS, ss);
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#endif
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#undef PUTREG
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sc.oldmask = mask;
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sc.fpstate = to_fp;
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err = copy_to_user(to, &sc, sizeof(struct sigcontext));
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if (err)
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return 1;
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pid = userspace_pid[current_thread_info()->cpu];
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#ifdef CONFIG_X86_32
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if (have_fpx_regs) {
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struct user_fxsr_struct fpx;
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err = save_fpx_registers(pid, (unsigned long *) &fpx);
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if (err < 0){
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printk(KERN_ERR "copy_sc_to_user - save_fpx_registers "
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"failed, errno = %d\n", err);
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return 1;
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}
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err = convert_fxsr_to_user(to_fp, &fpx);
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if (err)
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return 1;
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err |= __put_user(fpx.swd, &to_fp->status);
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err |= __put_user(X86_FXSR_MAGIC, &to_fp->magic);
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if (err)
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return 1;
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if (copy_to_user(&to_fp->_fxsr_env[0], &fpx,
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sizeof(struct user_fxsr_struct)))
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return 1;
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} else
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#endif
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{
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struct user_i387_struct fp;
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err = save_fp_registers(pid, (unsigned long *) &fp);
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if (copy_to_user(to_fp, &fp, sizeof(struct user_i387_struct)))
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return 1;
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}
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return 0;
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}
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#ifdef CONFIG_X86_32
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static int copy_ucontext_to_user(struct ucontext __user *uc,
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struct _fpstate __user *fp, sigset_t *set,
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unsigned long sp)
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{
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int err = 0;
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err |= __save_altstack(&uc->uc_stack, sp);
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err |= copy_sc_to_user(&uc->uc_mcontext, fp, ¤t->thread.regs, 0);
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err |= copy_to_user(&uc->uc_sigmask, set, sizeof(*set));
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return err;
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}
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struct sigframe
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{
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char __user *pretcode;
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int sig;
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struct sigcontext sc;
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struct _fpstate fpstate;
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unsigned long extramask[_NSIG_WORDS-1];
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char retcode[8];
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};
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struct rt_sigframe
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{
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char __user *pretcode;
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int sig;
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struct siginfo __user *pinfo;
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void __user *puc;
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struct siginfo info;
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struct ucontext uc;
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struct _fpstate fpstate;
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char retcode[8];
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};
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int setup_signal_stack_sc(unsigned long stack_top, struct ksignal *ksig,
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struct pt_regs *regs, sigset_t *mask)
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{
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struct sigframe __user *frame;
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void __user *restorer;
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int err = 0, sig = ksig->sig;
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/* This is the same calculation as i386 - ((sp + 4) & 15) == 0 */
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stack_top = ((stack_top + 4) & -16UL) - 4;
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frame = (struct sigframe __user *) stack_top - 1;
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if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
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return 1;
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restorer = frame->retcode;
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if (ksig->ka.sa.sa_flags & SA_RESTORER)
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restorer = ksig->ka.sa.sa_restorer;
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err |= __put_user(restorer, &frame->pretcode);
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err |= __put_user(sig, &frame->sig);
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err |= copy_sc_to_user(&frame->sc, &frame->fpstate, regs, mask->sig[0]);
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if (_NSIG_WORDS > 1)
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err |= __copy_to_user(&frame->extramask, &mask->sig[1],
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sizeof(frame->extramask));
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/*
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* This is popl %eax ; movl $,%eax ; int $0x80
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*
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* WE DO NOT USE IT ANY MORE! It's only left here for historical
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* reasons and because gdb uses it as a signature to notice
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* signal handler stack frames.
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*/
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err |= __put_user(0xb858, (short __user *)(frame->retcode+0));
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err |= __put_user(__NR_sigreturn, (int __user *)(frame->retcode+2));
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err |= __put_user(0x80cd, (short __user *)(frame->retcode+6));
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if (err)
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return err;
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PT_REGS_SP(regs) = (unsigned long) frame;
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PT_REGS_IP(regs) = (unsigned long) ksig->ka.sa.sa_handler;
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PT_REGS_AX(regs) = (unsigned long) sig;
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PT_REGS_DX(regs) = (unsigned long) 0;
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PT_REGS_CX(regs) = (unsigned long) 0;
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return 0;
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}
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int setup_signal_stack_si(unsigned long stack_top, struct ksignal *ksig,
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struct pt_regs *regs, sigset_t *mask)
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{
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struct rt_sigframe __user *frame;
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void __user *restorer;
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int err = 0, sig = ksig->sig;
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stack_top &= -8UL;
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frame = (struct rt_sigframe __user *) stack_top - 1;
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if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
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return 1;
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restorer = frame->retcode;
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if (ksig->ka.sa.sa_flags & SA_RESTORER)
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restorer = ksig->ka.sa.sa_restorer;
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err |= __put_user(restorer, &frame->pretcode);
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err |= __put_user(sig, &frame->sig);
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err |= __put_user(&frame->info, &frame->pinfo);
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err |= __put_user(&frame->uc, &frame->puc);
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err |= copy_siginfo_to_user(&frame->info, &ksig->info);
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err |= copy_ucontext_to_user(&frame->uc, &frame->fpstate, mask,
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PT_REGS_SP(regs));
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/*
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* This is movl $,%eax ; int $0x80
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*
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* WE DO NOT USE IT ANY MORE! It's only left here for historical
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* reasons and because gdb uses it as a signature to notice
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* signal handler stack frames.
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*/
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err |= __put_user(0xb8, (char __user *)(frame->retcode+0));
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err |= __put_user(__NR_rt_sigreturn, (int __user *)(frame->retcode+1));
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err |= __put_user(0x80cd, (short __user *)(frame->retcode+5));
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if (err)
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return err;
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PT_REGS_SP(regs) = (unsigned long) frame;
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PT_REGS_IP(regs) = (unsigned long) ksig->ka.sa.sa_handler;
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PT_REGS_AX(regs) = (unsigned long) sig;
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PT_REGS_DX(regs) = (unsigned long) &frame->info;
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PT_REGS_CX(regs) = (unsigned long) &frame->uc;
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return 0;
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}
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long sys_sigreturn(void)
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{
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unsigned long sp = PT_REGS_SP(¤t->thread.regs);
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struct sigframe __user *frame = (struct sigframe __user *)(sp - 8);
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sigset_t set;
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struct sigcontext __user *sc = &frame->sc;
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unsigned long __user *oldmask = &sc->oldmask;
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unsigned long __user *extramask = frame->extramask;
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int sig_size = (_NSIG_WORDS - 1) * sizeof(unsigned long);
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if (copy_from_user(&set.sig[0], oldmask, sizeof(set.sig[0])) ||
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copy_from_user(&set.sig[1], extramask, sig_size))
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goto segfault;
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set_current_blocked(&set);
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if (copy_sc_from_user(¤t->thread.regs, sc))
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goto segfault;
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/* Avoid ERESTART handling */
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PT_REGS_SYSCALL_NR(¤t->thread.regs) = -1;
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return PT_REGS_SYSCALL_RET(¤t->thread.regs);
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segfault:
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force_sig(SIGSEGV, current);
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return 0;
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}
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#else
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struct rt_sigframe
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{
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char __user *pretcode;
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struct ucontext uc;
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struct siginfo info;
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struct _fpstate fpstate;
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};
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int setup_signal_stack_si(unsigned long stack_top, struct ksignal *ksig,
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struct pt_regs *regs, sigset_t *set)
|
|
{
|
|
struct rt_sigframe __user *frame;
|
|
int err = 0, sig = ksig->sig;
|
|
|
|
frame = (struct rt_sigframe __user *)
|
|
round_down(stack_top - sizeof(struct rt_sigframe), 16);
|
|
/* Subtract 128 for a red zone and 8 for proper alignment */
|
|
frame = (struct rt_sigframe __user *) ((unsigned long) frame - 128 - 8);
|
|
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
|
goto out;
|
|
|
|
if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
|
|
err |= copy_siginfo_to_user(&frame->info, &ksig->info);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
|
|
/* Create the ucontext. */
|
|
err |= __put_user(0, &frame->uc.uc_flags);
|
|
err |= __put_user(0, &frame->uc.uc_link);
|
|
err |= __save_altstack(&frame->uc.uc_stack, PT_REGS_SP(regs));
|
|
err |= copy_sc_to_user(&frame->uc.uc_mcontext, &frame->fpstate, regs,
|
|
set->sig[0]);
|
|
err |= __put_user(&frame->fpstate, &frame->uc.uc_mcontext.fpstate);
|
|
if (sizeof(*set) == 16) {
|
|
err |= __put_user(set->sig[0], &frame->uc.uc_sigmask.sig[0]);
|
|
err |= __put_user(set->sig[1], &frame->uc.uc_sigmask.sig[1]);
|
|
}
|
|
else
|
|
err |= __copy_to_user(&frame->uc.uc_sigmask, set,
|
|
sizeof(*set));
|
|
|
|
/*
|
|
* Set up to return from userspace. If provided, use a stub
|
|
* already in userspace.
|
|
*/
|
|
/* x86-64 should always use SA_RESTORER. */
|
|
if (ksig->ka.sa.sa_flags & SA_RESTORER)
|
|
err |= __put_user(ksig->ka.sa.sa_restorer, &frame->pretcode);
|
|
else
|
|
/* could use a vstub here */
|
|
return err;
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
/* Set up registers for signal handler */
|
|
{
|
|
struct exec_domain *ed = current_thread_info()->exec_domain;
|
|
if (unlikely(ed && ed->signal_invmap && sig < 32))
|
|
sig = ed->signal_invmap[sig];
|
|
}
|
|
|
|
PT_REGS_SP(regs) = (unsigned long) frame;
|
|
PT_REGS_DI(regs) = sig;
|
|
/* In case the signal handler was declared without prototypes */
|
|
PT_REGS_AX(regs) = 0;
|
|
|
|
/*
|
|
* This also works for non SA_SIGINFO handlers because they expect the
|
|
* next argument after the signal number on the stack.
|
|
*/
|
|
PT_REGS_SI(regs) = (unsigned long) &frame->info;
|
|
PT_REGS_DX(regs) = (unsigned long) &frame->uc;
|
|
PT_REGS_IP(regs) = (unsigned long) ksig->ka.sa.sa_handler;
|
|
out:
|
|
return err;
|
|
}
|
|
#endif
|
|
|
|
long sys_rt_sigreturn(void)
|
|
{
|
|
unsigned long sp = PT_REGS_SP(¤t->thread.regs);
|
|
struct rt_sigframe __user *frame =
|
|
(struct rt_sigframe __user *)(sp - sizeof(long));
|
|
struct ucontext __user *uc = &frame->uc;
|
|
sigset_t set;
|
|
|
|
if (copy_from_user(&set, &uc->uc_sigmask, sizeof(set)))
|
|
goto segfault;
|
|
|
|
set_current_blocked(&set);
|
|
|
|
if (copy_sc_from_user(¤t->thread.regs, &uc->uc_mcontext))
|
|
goto segfault;
|
|
|
|
/* Avoid ERESTART handling */
|
|
PT_REGS_SYSCALL_NR(¤t->thread.regs) = -1;
|
|
return PT_REGS_SYSCALL_RET(¤t->thread.regs);
|
|
|
|
segfault:
|
|
force_sig(SIGSEGV, current);
|
|
return 0;
|
|
}
|