| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Jeff Dike | 2308 | 67.51% | 13 | 34.21% |
| Al Viro | 953 | 27.87% | 13 | 34.21% |
| Richard Weinberger | 96 | 2.81% | 3 | 7.89% |
| Eli Cooper | 24 | 0.70% | 2 | 5.26% |
| Bodo Stroesser | 22 | 0.64% | 1 | 2.63% |
| WANG Cong | 8 | 0.23% | 1 | 2.63% |
| Jesper Juhl | 4 | 0.12% | 1 | 2.63% |
| Linus Torvalds | 1 | 0.03% | 1 | 2.63% |
| Phil Carmody | 1 | 0.03% | 1 | 2.63% |
| Mickaël Salaün | 1 | 0.03% | 1 | 2.63% |
| Andrew Lutomirski | 1 | 0.03% | 1 | 2.63% |
| Total | 3419 | 38 |
/* * Copyright (C) 2003 PathScale, Inc. * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) * Licensed under the GPL */ #include <linux/personality.h> #include <linux/ptrace.h> #include <linux/kernel.h> #include <asm/unistd.h> #include <linux/uaccess.h> #include <asm/ucontext.h> #include <frame_kern.h> #include <skas.h> #ifdef CONFIG_X86_32 /* * 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; #endif static int copy_sc_from_user(struct pt_regs *regs, struct sigcontext __user *from) { struct sigcontext sc; int err, pid; /* Always make any pending restarted system calls return -EINTR */ current->restart_block.fn = do_no_restart_syscall; err = copy_from_user(&sc, from, sizeof(sc)); if (err) return err; #define GETREG(regno, regname) regs->regs.gp[HOST_##regno] = sc.regname #ifdef CONFIG_X86_32 GETREG(GS, gs); GETREG(FS, fs); GETREG(ES, es); GETREG(DS, ds); #endif GETREG(DI, di); GETREG(SI, si); GETREG(BP, bp); GETREG(SP, sp); GETREG(BX, bx); GETREG(DX, dx); GETREG(CX, cx); GETREG(AX, ax); GETREG(IP, ip); #ifdef CONFIG_X86_64 GETREG(R8, r8); GETREG(R9, r9); GETREG(R10, r10); GETREG(R11, r11); GETREG(R12, r12); GETREG(R13, r13); GETREG(R14, r14); GETREG(R15, r15); #endif GETREG(CS, cs); GETREG(EFLAGS, flags); #ifdef CONFIG_X86_32 GETREG(SS, ss); #endif #undef GETREG pid = userspace_pid[current_thread_info()->cpu]; #ifdef CONFIG_X86_32 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, (void *)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 #endif { err = copy_from_user(regs->regs.fp, (void *)sc.fpstate, sizeof(struct _xstate)); if (err) return 1; } return 0; } static int copy_sc_to_user(struct sigcontext __user *to, struct _xstate __user *to_fp, struct pt_regs *regs, unsigned long mask) { struct sigcontext sc; struct faultinfo * fi = ¤t->thread.arch.faultinfo; int err, pid; memset(&sc, 0, sizeof(struct sigcontext)); #define PUTREG(regno, regname) sc.regname = regs->regs.gp[HOST_##regno] #ifdef CONFIG_X86_32 PUTREG(GS, gs); PUTREG(FS, fs); PUTREG(ES, es); PUTREG(DS, ds); #endif PUTREG(DI, di); PUTREG(SI, si); PUTREG(BP, bp); PUTREG(SP, sp); PUTREG(BX, bx); PUTREG(DX, dx); PUTREG(CX, cx); PUTREG(AX, ax); #ifdef CONFIG_X86_64 PUTREG(R8, r8); PUTREG(R9, r9); PUTREG(R10, r10); PUTREG(R11, r11); PUTREG(R12, r12); PUTREG(R13, r13); PUTREG(R14, r14); PUTREG(R15, r15); #endif sc.cr2 = fi->cr2; sc.err = fi->error_code; sc.trapno = fi->trap_no; PUTREG(IP, ip); PUTREG(CS, cs); PUTREG(EFLAGS, flags); #ifdef CONFIG_X86_32 PUTREG(SP, sp_at_signal); PUTREG(SS, ss); #endif #undef PUTREG sc.oldmask = mask; sc.fpstate = (unsigned long)to_fp; err = copy_to_user(to, &sc, sizeof(struct sigcontext)); if (err) return 1; pid = userspace_pid[current_thread_info()->cpu]; #ifdef CONFIG_X86_32 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->fpstate, &fpx); if (err) return 1; err |= __put_user(fpx.swd, &to_fp->fpstate.status); err |= __put_user(X86_FXSR_MAGIC, &to_fp->fpstate.magic); if (err) return 1; if (copy_to_user(&to_fp->fpstate._fxsr_env[0], &fpx, sizeof(struct user_fxsr_struct))) return 1; } else #endif { if (copy_to_user(to_fp, regs->regs.fp, sizeof(struct _xstate))) return 1; } return 0; } #ifdef CONFIG_X86_32 static int copy_ucontext_to_user(struct ucontext __user *uc, struct _xstate __user *fp, sigset_t *set, unsigned long sp) { int err = 0; err |= __save_altstack(&uc->uc_stack, sp); err |= copy_sc_to_user(&uc->uc_mcontext, fp, ¤t->thread.regs, 0); err |= copy_to_user(&uc->uc_sigmask, set, sizeof(*set)); return err; } struct sigframe { char __user *pretcode; int sig; struct sigcontext sc; struct _xstate 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 _xstate fpstate; char retcode[8]; }; int setup_signal_stack_sc(unsigned long stack_top, struct ksignal *ksig, struct pt_regs *regs, sigset_t *mask) { struct sigframe __user *frame; void __user *restorer; int err = 0, sig = ksig->sig; /* 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(frame, sizeof(*frame))) return 1; restorer = frame->retcode; if (ksig->ka.sa.sa_flags & SA_RESTORER) restorer = ksig->ka.sa.sa_restorer; err |= __put_user(restorer, &frame->pretcode); err |= __put_user(sig, &frame->sig); err |= copy_sc_to_user(&frame->sc, &frame->fpstate, regs, mask->sig[0]); 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) return err; PT_REGS_SP(regs) = (unsigned long) frame; PT_REGS_IP(regs) = (unsigned long) ksig->ka.sa.sa_handler; PT_REGS_AX(regs) = (unsigned long) sig; PT_REGS_DX(regs) = (unsigned long) 0; PT_REGS_CX(regs) = (unsigned long) 0; return 0; } int setup_signal_stack_si(unsigned long stack_top, struct ksignal *ksig, struct pt_regs *regs, sigset_t *mask) { struct rt_sigframe __user *frame; void __user *restorer; int err = 0, sig = ksig->sig; stack_top &= -8UL; frame = (struct rt_sigframe __user *) stack_top - 1; if (!access_ok(frame, sizeof(*frame))) return 1; restorer = frame->retcode; if (ksig->ka.sa.sa_flags & SA_RESTORER) restorer = ksig->ka.sa.sa_restorer; 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, &ksig->info); err |= copy_ucontext_to_user(&frame->uc, &frame->fpstate, mask, PT_REGS_SP(regs)); /* * 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) return err; PT_REGS_SP(regs) = (unsigned long) frame; PT_REGS_IP(regs) = (unsigned long) ksig->ka.sa.sa_handler; PT_REGS_AX(regs) = (unsigned long) sig; PT_REGS_DX(regs) = (unsigned long) &frame->info; PT_REGS_CX(regs) = (unsigned long) &frame->uc; return 0; } long sys_sigreturn(void) { unsigned long sp = PT_REGS_SP(¤t->thread.regs); struct sigframe __user *frame = (struct sigframe __user *)(sp - 8); sigset_t set; struct sigcontext __user *sc = &frame->sc; int sig_size = (_NSIG_WORDS - 1) * sizeof(unsigned long); if (copy_from_user(&set.sig[0], &sc->oldmask, sizeof(set.sig[0])) || copy_from_user(&set.sig[1], frame->extramask, sig_size)) goto segfault; set_current_blocked(&set); if (copy_sc_from_user(¤t->thread.regs, sc)) 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; } #else struct rt_sigframe { char __user *pretcode; struct ucontext uc; struct siginfo info; struct _xstate fpstate; }; int setup_signal_stack_si(unsigned long stack_top, struct ksignal *ksig, struct pt_regs *regs, sigset_t *set) { struct rt_sigframe __user *frame; int err = 0, sig = ksig->sig; unsigned long fp_to; 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(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]); fp_to = (unsigned long)&frame->fpstate; err |= __put_user(fp_to, &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((void *)ksig->ka.sa.sa_restorer, &frame->pretcode); else /* could use a vstub here */ return err; if (err) return err; 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; }
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