Release 4.14 arch/x86/um/ptrace_32.c

/*
 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/uaccess.h>
#include <asm/ptrace-abi.h>
#include <skas.h>

extern int arch_switch_tls(struct task_struct *to);



void arch_switch_to(struct task_struct *to)
{
	int err = arch_switch_tls(to);
	if (!err)
		return;

	if (err != -EINVAL)
		printk(KERN_WARNING "arch_switch_tls failed, errno %d, "
		       "not EINVAL\n", -err);
	else
		printk(KERN_WARNING "arch_switch_tls failed, errno = EINVAL\n");
}

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Paolo 'Blaisorblade' Giarrusso
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3
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Jeff Dike
5
10.42%
2
40.00%
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48
100.00%
5
100.00%



int is_syscall(unsigned long addr)
{
	unsigned short instr;
	int n;

	n = copy_from_user(&instr, (void __user *) addr, sizeof(instr));
	if (n) {
		/* access_process_vm() grants access to vsyscall and stub,
                 * while copy_from_user doesn't. Maybe access_process_vm is
                 * slow, but that doesn't matter, since it will be called only
                 * in case of singlestepping, if copy_from_user failed.
                 */
		n = access_process_vm(current, addr, &instr, sizeof(instr),
				FOLL_FORCE);
		if (n != sizeof(instr)) {
			printk(KERN_ERR "is_syscall : failed to read "
			       "instruction from 0x%lx\n", addr);
			return 1;
		}
	}
	/* int 0x80 or sysenter */
	return (instr == 0x80cd) || (instr == 0x340f);
}

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Jeff Dike
67
67.68%
5
71.43%
Bodo Stroesser
31
31.31%
1
14.29%
Lorenzo Stoakes
1
1.01%
1
14.29%
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99
100.00%
7
100.00%

/* determines which flags the user has access to. */
/* 1 = access 0 = no access */

#define FLAG_MASK 0x00044dd5


static const int reg_offsets[] = {
	[EBX] = HOST_BX,
	[ECX] = HOST_CX,
	[EDX] = HOST_DX,
	[ESI] = HOST_SI,
	[EDI] = HOST_DI,
	[EBP] = HOST_BP,
	[EAX] = HOST_AX,
	[DS] = HOST_DS,
	[ES] = HOST_ES,
	[FS] = HOST_FS,
	[GS] = HOST_GS,
	[EIP] = HOST_IP,
	[CS] = HOST_CS,
	[EFL] = HOST_EFLAGS,
	[UESP] = HOST_SP,
	[SS] = HOST_SS,
	[ORIG_EAX] = HOST_ORIG_AX,
};



int putreg(struct task_struct *child, int regno, unsigned long value)
{
	regno >>= 2;
	switch (regno) {
	case EBX:
	case ECX:
	case EDX:
	case ESI:
	case EDI:
	case EBP:
	case EAX:
	case EIP:
	case UESP:
		break;
	case ORIG_EAX:
		/* Update the syscall number. */
		UPT_SYSCALL_NR(&child->thread.regs.regs) = value;
		break;
	case FS:
		if (value && (value & 3) != 3)
			return -EIO;
		break;
	case GS:
		if (value && (value & 3) != 3)
			return -EIO;
		break;
	case DS:
	case ES:
		if (value && (value & 3) != 3)
			return -EIO;
		value &= 0xffff;
		break;
	case SS:
	case CS:
		if ((value & 3) != 3)
			return -EIO;
		value &= 0xffff;
		break;
	case EFL:
		value &= FLAG_MASK;
		child->thread.regs.regs.gp[HOST_EFLAGS] |= value;
		return 0;
	default :
		panic("Bad register in putreg() : %d\n", regno);
	}
	child->thread.regs.regs.gp[reg_offsets[regno]] = value;
	return 0;
}

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Jeff Dike
138
62.73%
1
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63
28.64%
1
25.00%
Mickaël Salaün
19
8.64%
2
50.00%
Total
220
100.00%
4
100.00%



int poke_user(struct task_struct *child, long addr, long data)
{
	if ((addr & 3) || addr < 0)
		return -EIO;

	if (addr < MAX_REG_OFFSET)
		return putreg(child, addr, data);
	else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
		 (addr <= offsetof(struct user, u_debugreg[7]))) {
		addr -= offsetof(struct user, u_debugreg[0]);
		addr = addr >> 2;
		if ((addr == 4) || (addr == 5))
			return -EIO;
		child->thread.arch.debugregs[addr] = data;
		return 0;
	}
	return -EIO;
}

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Bodo Stroesser
140
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140
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1
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unsigned long getreg(struct task_struct *child, int regno)
{
	unsigned long mask = ~0UL;

	regno >>= 2;
	switch (regno) {
	case FS:
	case GS:
	case DS:
	case ES:
	case SS:
	case CS:
		mask = 0xffff;
		break;
	case EIP:
	case UESP:
	case EAX:
	case EBX:
	case ECX:
	case EDX:
	case ESI:
	case EDI:
	case EBP:
	case EFL:
	case ORIG_EAX:
		break;
	default:
		panic("Bad register in getreg() : %d\n", regno);
	}
	return mask & child->thread.regs.regs.gp[reg_offsets[regno]];
}

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Jeff Dike
60
52.17%
1
33.33%
Al Viro
52
45.22%
1
33.33%
Mickaël Salaün
3
2.61%
1
33.33%
Total
115
100.00%
3
100.00%

/* read the word at location addr in the USER area. */


int peek_user(struct task_struct *child, long addr, long data)
{
	unsigned long tmp;

	if ((addr & 3) || addr < 0)
		return -EIO;

	tmp = 0;  /* Default return condition */
	if (addr < MAX_REG_OFFSET) {
		tmp = getreg(child, addr);
	}
	else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
		 (addr <= offsetof(struct user, u_debugreg[7]))) {
		addr -= offsetof(struct user, u_debugreg[0]);
		addr = addr >> 2;
		tmp = child->thread.arch.debugregs[addr];
	}
	return put_user(tmp, (unsigned long __user *) data);
}

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Bodo Stroesser
138
99.28%
1
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Al Viro
1
0.72%
1
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139
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2
100.00%



static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
{
	int err, n, cpu = task_cpu(child);
	struct user_i387_struct fpregs;

	err = save_i387_registers(userspace_pid[cpu],
				  (unsigned long *) &fpregs);
	if (err)
		return err;

	n = copy_to_user(buf, &fpregs, sizeof(fpregs));
	if(n > 0)
		return -EFAULT;

	return n;
}

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Jeff Dike
81
94.19%
4
57.14%
Linus Torvalds
3
3.49%
1
14.29%
Al Viro
1
1.16%
1
14.29%
Eli Cooper
1
1.16%
1
14.29%
Total
86
100.00%
7
100.00%



static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
{
	int n, cpu = task_cpu(child);
	struct user_i387_struct fpregs;

	n = copy_from_user(&fpregs, buf, sizeof(fpregs));
	if (n > 0)
		return -EFAULT;

	return restore_i387_registers(userspace_pid[cpu],
				    (unsigned long *) &fpregs);
}

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Jeff Dike
68
93.15%
4
57.14%
Linus Torvalds
3
4.11%
1
14.29%
Eli Cooper
1
1.37%
1
14.29%
Al Viro
1
1.37%
1
14.29%
Total
73
100.00%
7
100.00%



static int get_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
{
	int err, n, cpu = task_cpu(child);
	struct user_fxsr_struct fpregs;

	err = save_fpx_registers(userspace_pid[cpu], (unsigned long *) &fpregs);
	if (err)
		return err;

	n = copy_to_user(buf, &fpregs, sizeof(fpregs));
	if(n > 0)
		return -EFAULT;

	return n;
}

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Jeff Dike
82
95.35%
4
66.67%
Linus Torvalds
3
3.49%
1
16.67%
Al Viro
1
1.16%
1
16.67%
Total
86
100.00%
6
100.00%



static int set_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
{
	int n, cpu = task_cpu(child);
	struct user_fxsr_struct fpregs;

	n = copy_from_user(&fpregs, buf, sizeof(fpregs));
	if (n > 0)
		return -EFAULT;

	return restore_fpx_registers(userspace_pid[cpu],
				     (unsigned long *) &fpregs);
}

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Jeff Dike
69
94.52%
3
60.00%
Linus Torvalds
3
4.11%
1
20.00%
Al Viro
1
1.37%
1
20.00%
Total
73
100.00%
5
100.00%



long subarch_ptrace(struct task_struct *child, long request,
		    unsigned long addr, unsigned long data)
{
	int ret = -EIO;
	void __user *datap = (void __user *) data;
	switch (request) {
	case PTRACE_GETFPREGS: /* Get the child FPU state. */
		ret = get_fpregs(datap, child);
		break;
	case PTRACE_SETFPREGS: /* Set the child FPU state. */
		ret = set_fpregs(datap, child);
		break;
	case PTRACE_GETFPXREGS: /* Get the child FPU state. */
		ret = get_fpxregs(datap, child);
		break;
	case PTRACE_SETFPXREGS: /* Set the child FPU state. */
		ret = set_fpxregs(datap, child);
		break;
	default:
		ret = -EIO;
	}
	return ret;
}
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Al Viro
86
78.18%
2
50.00%
Jeff Dike
22
20.00%
1
25.00%
Namhyung Kim
2
1.82%
1
25.00%
Total
110
100.00%
4
100.00%

Overall Contributors
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Tokens
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CommitProp
Jeff Dike
616
46.25%
10
34.48%
Al Viro
313
23.50%
6
20.69%
Bodo Stroesser
311
23.35%
2
6.90%
Paolo 'Blaisorblade' Giarrusso
43
3.23%
3
10.34%
Mickaël Salaün
28
2.10%
2
6.90%
Linus Torvalds
13
0.98%
2
6.90%
Richard Weinberger
3
0.23%
1
3.45%
Eli Cooper
2
0.15%
1
3.45%
Namhyung Kim
2
0.15%
1
3.45%
Lorenzo Stoakes
1
0.08%
1
3.45%
Total
1332
100.00%
29
100.00%
Directory: arch/x86/um

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