431 lines
11 KiB
C
431 lines
11 KiB
C
/*
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* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <linux/compiler.h>
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#include "linux/sched.h"
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#include "linux/mm.h"
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#include "asm/elf.h"
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#include "asm/ptrace.h"
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#include "asm/uaccess.h"
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#include "asm/unistd.h"
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#include "sysdep/ptrace.h"
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#include "sysdep/sigcontext.h"
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#include "sysdep/sc.h"
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void arch_switch_to_tt(struct task_struct *from, struct task_struct *to)
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{
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update_debugregs(to->thread.arch.debugregs_seq);
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arch_switch_tls_tt(from, to);
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}
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void arch_switch_to_skas(struct task_struct *from, struct task_struct *to)
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{
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int err = arch_switch_tls_skas(from, to);
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if (!err)
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return;
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if (err != -EINVAL)
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printk(KERN_WARNING "arch_switch_tls_skas failed, errno %d, not EINVAL\n", -err);
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else
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printk(KERN_WARNING "arch_switch_tls_skas failed, errno = EINVAL\n");
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}
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int is_syscall(unsigned long addr)
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{
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unsigned short instr;
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int n;
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n = copy_from_user(&instr, (void __user *) addr, sizeof(instr));
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if(n){
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/* access_process_vm() grants access to vsyscall and stub,
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* while copy_from_user doesn't. Maybe access_process_vm is
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* slow, but that doesn't matter, since it will be called only
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* in case of singlestepping, if copy_from_user failed.
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*/
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n = access_process_vm(current, addr, &instr, sizeof(instr), 0);
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if(n != sizeof(instr)) {
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printk("is_syscall : failed to read instruction from "
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"0x%lx\n", addr);
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return(1);
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}
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}
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/* int 0x80 or sysenter */
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return((instr == 0x80cd) || (instr == 0x340f));
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}
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/* determines which flags the user has access to. */
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/* 1 = access 0 = no access */
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#define FLAG_MASK 0x00044dd5
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int putreg(struct task_struct *child, int regno, unsigned long value)
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{
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regno >>= 2;
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switch (regno) {
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case FS:
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if (value && (value & 3) != 3)
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return -EIO;
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PT_REGS_FS(&child->thread.regs) = value;
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return 0;
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case GS:
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if (value && (value & 3) != 3)
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return -EIO;
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PT_REGS_GS(&child->thread.regs) = value;
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return 0;
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case DS:
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case ES:
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if (value && (value & 3) != 3)
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return -EIO;
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value &= 0xffff;
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break;
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case SS:
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case CS:
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if ((value & 3) != 3)
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return -EIO;
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value &= 0xffff;
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break;
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case EFL:
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value &= FLAG_MASK;
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value |= PT_REGS_EFLAGS(&child->thread.regs);
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break;
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}
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PT_REGS_SET(&child->thread.regs, regno, value);
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return 0;
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}
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int poke_user(struct task_struct *child, long addr, long data)
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{
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if ((addr & 3) || addr < 0)
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return -EIO;
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if (addr < MAX_REG_OFFSET)
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return putreg(child, addr, data);
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else if((addr >= offsetof(struct user, u_debugreg[0])) &&
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(addr <= offsetof(struct user, u_debugreg[7]))){
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addr -= offsetof(struct user, u_debugreg[0]);
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addr = addr >> 2;
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if((addr == 4) || (addr == 5)) return -EIO;
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child->thread.arch.debugregs[addr] = data;
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return 0;
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}
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return -EIO;
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}
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unsigned long getreg(struct task_struct *child, int regno)
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{
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unsigned long retval = ~0UL;
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regno >>= 2;
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switch (regno) {
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case FS:
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case GS:
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case DS:
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case ES:
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case SS:
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case CS:
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retval = 0xffff;
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/* fall through */
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default:
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retval &= PT_REG(&child->thread.regs, regno);
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}
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return retval;
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}
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int peek_user(struct task_struct *child, long addr, long data)
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{
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/* read the word at location addr in the USER area. */
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unsigned long tmp;
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if ((addr & 3) || addr < 0)
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return -EIO;
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tmp = 0; /* Default return condition */
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if(addr < MAX_REG_OFFSET){
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tmp = getreg(child, addr);
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}
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else if((addr >= offsetof(struct user, u_debugreg[0])) &&
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(addr <= offsetof(struct user, u_debugreg[7]))){
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addr -= offsetof(struct user, u_debugreg[0]);
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addr = addr >> 2;
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tmp = child->thread.arch.debugregs[addr];
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}
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return put_user(tmp, (unsigned long __user *) data);
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}
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struct i387_fxsave_struct {
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unsigned short cwd;
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unsigned short swd;
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unsigned short twd;
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unsigned short fop;
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long fip;
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long fcs;
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long foo;
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long fos;
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long mxcsr;
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long reserved;
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long st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
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long xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
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long padding[56];
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};
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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 i387_fxsave_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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/*
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* FXSR floating point environment conversions.
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*/
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#ifdef CONFIG_MODE_TT
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static inline int convert_fxsr_to_user_tt(struct _fpstate __user *buf,
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struct pt_regs *regs)
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{
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struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
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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 | 0xffff0000;
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env[1] = (unsigned long)fxsave->swd | 0xffff0000;
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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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if ( __copy_to_user( to, from, sizeof(*to) ) )
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return 1;
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}
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return 0;
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}
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#endif
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static inline int convert_fxsr_to_user(struct _fpstate __user *buf,
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struct pt_regs *regs)
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{
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return(CHOOSE_MODE(convert_fxsr_to_user_tt(buf, regs), 0));
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}
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#ifdef CONFIG_MODE_TT
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static inline int convert_fxsr_from_user_tt(struct pt_regs *regs,
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struct _fpstate __user *buf)
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{
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struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
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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] & 0xffff0000) >> 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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if ( __copy_from_user( to, from, sizeof(*from) ) )
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return 1;
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}
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return 0;
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}
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#endif
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static inline int convert_fxsr_from_user(struct pt_regs *regs,
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struct _fpstate __user *buf)
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{
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return(CHOOSE_MODE(convert_fxsr_from_user_tt(regs, buf), 0));
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}
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int get_fpregs(unsigned long buf, struct task_struct *child)
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{
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int err;
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err = convert_fxsr_to_user((struct _fpstate __user *) buf,
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&child->thread.regs);
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if(err) return(-EFAULT);
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else return(0);
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}
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int set_fpregs(unsigned long buf, struct task_struct *child)
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{
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int err;
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err = convert_fxsr_from_user(&child->thread.regs,
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(struct _fpstate __user *) buf);
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if(err) return(-EFAULT);
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else return(0);
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}
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#ifdef CONFIG_MODE_TT
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int get_fpxregs_tt(unsigned long buf, struct task_struct *tsk)
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{
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struct pt_regs *regs = &tsk->thread.regs;
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struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
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int err;
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err = __copy_to_user((void __user *) buf, fxsave,
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sizeof(struct user_fxsr_struct));
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if(err) return -EFAULT;
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else return 0;
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}
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#endif
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int get_fpxregs(unsigned long buf, struct task_struct *tsk)
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{
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return(CHOOSE_MODE(get_fpxregs_tt(buf, tsk), 0));
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}
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#ifdef CONFIG_MODE_TT
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int set_fpxregs_tt(unsigned long buf, struct task_struct *tsk)
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{
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struct pt_regs *regs = &tsk->thread.regs;
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struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
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int err;
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err = __copy_from_user(fxsave, (void __user *) buf,
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sizeof(struct user_fxsr_struct) );
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if(err) return -EFAULT;
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else return 0;
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}
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#endif
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int set_fpxregs(unsigned long buf, struct task_struct *tsk)
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{
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return(CHOOSE_MODE(set_fpxregs_tt(buf, tsk), 0));
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}
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#ifdef notdef
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int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
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{
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fpu->cwd = (((SC_FP_CW(PT_REGS_SC(regs)) & 0xffff) << 16) |
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(SC_FP_SW(PT_REGS_SC(regs)) & 0xffff));
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fpu->swd = SC_FP_CSSEL(PT_REGS_SC(regs)) & 0xffff;
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fpu->twd = SC_FP_IPOFF(PT_REGS_SC(regs));
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fpu->fip = SC_FP_CSSEL(PT_REGS_SC(regs)) & 0xffff;
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fpu->fcs = SC_FP_DATAOFF(PT_REGS_SC(regs));
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fpu->foo = SC_FP_DATASEL(PT_REGS_SC(regs));
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fpu->fos = 0;
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memcpy(fpu->st_space, (void *) SC_FP_ST(PT_REGS_SC(regs)),
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sizeof(fpu->st_space));
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return(1);
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}
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#endif
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#ifdef CONFIG_MODE_TT
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static inline void copy_fpu_fxsave_tt(struct pt_regs *regs,
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struct user_i387_struct *buf)
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{
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struct i387_fxsave_struct *fpu = SC_FXSR_ENV(PT_REGS_SC(regs));
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unsigned short *to;
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unsigned short *from;
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int i;
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memcpy( buf, fpu, 7 * sizeof(long) );
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to = (unsigned short *) &buf->st_space[0];
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from = (unsigned short *) &fpu->st_space[0];
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for ( i = 0 ; i < 8 ; i++, to += 5, from += 8 ) {
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memcpy( to, from, 5 * sizeof(unsigned short) );
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}
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}
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#endif
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static inline void copy_fpu_fxsave(struct pt_regs *regs,
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struct user_i387_struct *buf)
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{
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(void) CHOOSE_MODE(copy_fpu_fxsave_tt(regs, buf), 0);
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}
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int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu )
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{
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copy_fpu_fxsave(regs, (struct user_i387_struct *) fpu);
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return(1);
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}
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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