[net-next-2.6.git] / arch / um / sys-x86_64 / ptrace.c

/*
 * Copyright 2003 PathScale, Inc.
 *
 * Licensed under the GPL
 */

#define __FRAME_OFFSETS
#include <asm/ptrace.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <asm/uaccess.h>
#include <asm/elf.h>

/* XXX x86_64 */
unsigned long not_ss;
unsigned long not_ds;
unsigned long not_es;

#define SC_SS(r) (not_ss)
#define SC_DS(r) (not_ds)
#define SC_ES(r) (not_es)

/* determines which flags the user has access to. */
/* 1 = access 0 = no access */
#define FLAG_MASK 0x44dd5UL

int putreg(struct task_struct *child, int regno, unsigned long value)
{
	unsigned long tmp;

#ifdef TIF_IA32
	/* Some code in the 64bit emulation may not be 64bit clean.
	   Don't take any chances. */
	if (test_tsk_thread_flag(child, TIF_IA32))
		value &= 0xffffffff;
#endif
	switch (regno){
	case FS:
	case GS:
	case DS:
	case ES:
	case SS:
	case CS:
		if (value && (value & 3) != 3)
			return -EIO;
		value &= 0xffff;
		break;

	case FS_BASE:
	case GS_BASE:
		if (!((value >> 48) == 0 || (value >> 48) == 0xffff))
			return -EIO;
		break;

	case EFLAGS:
		value &= FLAG_MASK;
		tmp = PT_REGS_EFLAGS(&child->thread.regs) & ~FLAG_MASK;
		value |= tmp;
		break;
	}

	PT_REGS_SET(&child->thread.regs, regno, value);
	return 0;
}

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;
}

unsigned long getreg(struct task_struct *child, int regno)
{
	unsigned long retval = ~0UL;
	switch (regno) {
	case FS:
	case GS:
	case DS:
	case ES:
	case SS:
	case CS:
		retval = 0xffff;
		/* fall through */
	default:
		retval &= PT_REG(&child->thread.regs, regno);
#ifdef TIF_IA32
		if (test_tsk_thread_flag(child, TIF_IA32))
			retval &= 0xffffffff;
#endif
	}
	return retval;
}

int peek_user(struct task_struct *child, long addr, long data)
{
	/* read the word at location addr in the USER area. */
        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 *) data);
}

void arch_switch(void)
{
/* XXX
	printk("arch_switch\n");
*/
}

/* XXX Mostly copied from sys-i386 */
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), 0);
		if(n != sizeof(instr)) {
			printk("is_syscall : failed to read instruction from "
			       "0x%lx\n", addr);
			return(1);
		}
	}
	/* sysenter */
	return(instr == 0x050f);
}

int get_fpregs(unsigned long buf, struct task_struct *child)
{
	panic("get_fpregs");
	return(0);
}

int set_fpregs(unsigned long buf, struct task_struct *child)
{
	panic("set_fpregs");
	return(0);
}

int get_fpxregs(unsigned long buf, struct task_struct *tsk)
{
	panic("get_fpxregs");
	return(0);
}

int set_fpxregs(unsigned long buf, struct task_struct *tsk)
{
	panic("set_fxpregs");
	return(0);
}

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * Emacs will notice this stuff at the end of the file and automatically
 * adjust the settings for this buffer only.  This must remain at the end
 * of the file.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-file-style: "linux"
 * End:
 */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright 2003 PathScale, Inc.
	3	*
	4	* Licensed under the GPL
	5	*/
	6
	7	#define __FRAME_OFFSETS
ba9950c8 JD	8	#include <asm/ptrace.h>
	9	#include <linux/sched.h>
	10	#include <linux/errno.h>
81efcd33	11	#include <linux/mm.h>
ba9950c8 JD	12	#include <asm/uaccess.h>
ba9950c8 JD	13	#include <asm/elf.h>
1da177e4 LT	14
	15	/* XXX x86_64 */
	16	unsigned long not_ss;
	17	unsigned long not_ds;
	18	unsigned long not_es;
	19
	20	#define SC_SS(r) (not_ss)
	21	#define SC_DS(r) (not_ds)
	22	#define SC_ES(r) (not_es)
	23
	24	/* determines which flags the user has access to. */
	25	/* 1 = access 0 = no access */
	26	#define FLAG_MASK 0x44dd5UL
	27
	28	int putreg(struct task_struct *child, int regno, unsigned long value)
	29	{
	30	unsigned long tmp;
	31
	32	#ifdef TIF_IA32
	33	/* Some code in the 64bit emulation may not be 64bit clean.
	34	Don't take any chances. */
	35	if (test_tsk_thread_flag(child, TIF_IA32))
	36	value &= 0xffffffff;
	37	#endif
	38	switch (regno){
	39	case FS:
	40	case GS:
	41	case DS:
	42	case ES:
	43	case SS:
	44	case CS:
	45	if (value && (value & 3) != 3)
	46	return -EIO;
	47	value &= 0xffff;
	48	break;
	49
	50	case FS_BASE:
	51	case GS_BASE:
	52	if (!((value >> 48) == 0 \|\| (value >> 48) == 0xffff))
	53	return -EIO;
	54	break;
	55
	56	case EFLAGS:
	57	value &= FLAG_MASK;
	58	tmp = PT_REGS_EFLAGS(&child->thread.regs) & ~FLAG_MASK;
	59	value \|= tmp;
	60	break;
	61	}
	62
	63	PT_REGS_SET(&child->thread.regs, regno, value);
	64	return 0;
	65	}
	66
82c1c11b BS	67	int poke_user(struct task_struct *child, long addr, long data)
	68	{
	69	if ((addr & 3) \|\| addr < 0)
	70	return -EIO;
	71
	72	if (addr < MAX_REG_OFFSET)
	73	return putreg(child, addr, data);
82c1c11b BS	74	else if((addr >= offsetof(struct user, u_debugreg[0])) &&
	75	(addr <= offsetof(struct user, u_debugreg[7]))){
	76	addr -= offsetof(struct user, u_debugreg[0]);
	77	addr = addr >> 2;
	78	if((addr == 4) \|\| (addr == 5)) return -EIO;
	79	child->thread.arch.debugregs[addr] = data;
	80	return 0;
	81	}
82c1c11b BS	82	return -EIO;
	83	}
	84
1da177e4 LT	85	unsigned long getreg(struct task_struct *child, int regno)
	86	{
	87	unsigned long retval = ~0UL;
	88	switch (regno) {
	89	case FS:
	90	case GS:
	91	case DS:
	92	case ES:
	93	case SS:
	94	case CS:
	95	retval = 0xffff;
	96	/* fall through */
	97	default:
	98	retval &= PT_REG(&child->thread.regs, regno);
	99	#ifdef TIF_IA32
	100	if (test_tsk_thread_flag(child, TIF_IA32))
	101	retval &= 0xffffffff;
	102	#endif
	103	}
	104	return retval;
	105	}
	106
82c1c11b BS	107	int peek_user(struct task_struct *child, long addr, long data)
	108	{
	109	/* read the word at location addr in the USER area. */
	110	unsigned long tmp;
	111
	112	if ((addr & 3) \|\| addr < 0)
	113	return -EIO;
	114
	115	tmp = 0; /* Default return condition */
	116	if(addr < MAX_REG_OFFSET){
	117	tmp = getreg(child, addr);
	118	}
82c1c11b BS	119	else if((addr >= offsetof(struct user, u_debugreg[0])) &&
	120	(addr <= offsetof(struct user, u_debugreg[7]))){
	121	addr -= offsetof(struct user, u_debugreg[0]);
	122	addr = addr >> 2;
	123	tmp = child->thread.arch.debugregs[addr];
	124	}
82c1c11b BS	125	return put_user(tmp, (unsigned long *) data);
	126	}
	127
1da177e4 LT	128	void arch_switch(void)
	129	{
	130	/* XXX
	131	printk("arch_switch\n");
	132	*/
	133	}
	134
81efcd33	135	/* XXX Mostly copied from sys-i386 */
1da177e4 LT	136	int is_syscall(unsigned long addr)
1da177e4 LT	137	{
81efcd33 BS	138	unsigned short instr;
	139	int n;
	140
	141	n = copy_from_user(&instr, (void __user *) addr, sizeof(instr));
	142	if(n){
	143	/* access_process_vm() grants access to vsyscall and stub,
	144	* while copy_from_user doesn't. Maybe access_process_vm is
	145	* slow, but that doesn't matter, since it will be called only
	146	* in case of singlestepping, if copy_from_user failed.
	147	*/
	148	n = access_process_vm(current, addr, &instr, sizeof(instr), 0);
	149	if(n != sizeof(instr)) {
	150	printk("is_syscall : failed to read instruction from "
	151	"0x%lx\n", addr);
	152	return(1);
	153	}
	154	}
	155	/* sysenter */
	156	return(instr == 0x050f);
1da177e4 LT	157	}
1da177e4 LT	158
1da177e4 LT	159	int get_fpregs(unsigned long buf, struct task_struct *child)
	160	{
	161	panic("get_fpregs");
	162	return(0);
	163	}
	164
	165	int set_fpregs(unsigned long buf, struct task_struct *child)
	166	{
	167	panic("set_fpregs");
	168	return(0);
	169	}
	170
	171	int get_fpxregs(unsigned long buf, struct task_struct *tsk)
	172	{
	173	panic("get_fpxregs");
	174	return(0);
	175	}
	176
	177	int set_fpxregs(unsigned long buf, struct task_struct *tsk)
	178	{
	179	panic("set_fxpregs");
	180	return(0);
	181	}
	182
	183	/*
	184	* Overrides for Emacs so that we follow Linus's tabbing style.
	185	* Emacs will notice this stuff at the end of the file and automatically
	186	* adjust the settings for this buffer only. This must remain at the end
	187	* of the file.
	188	* ---------------------------------------------------------------------------
	189	* Local variables:
	190	* c-file-style: "linux"
	191	* End:
	192	*/