linux/arch/um/sys-x86_64/ptrace.c
Jeff Dike ba9950c820 [PATCH] uml: small fixes left over from rc4
Some changes that I sent in didn't make 2.6.12-rc4 for some reason.  This
adds them back.  We have
	an x86_64 definition of TOP_ADDR
	a reimplementation of the x86_64 csum_partial_copy_from_user
	some syntax fixes in arch/um/kernel/ptrace.c
	removal of a CFLAGS definition in the x86_64 Makefile
	some include changes in the x86_64 ptrace.c and user-offsets.h
	a syntax fix in elf-x86_64.h
Also moved an include in the i386 and x86_64 Makefiles to make the symlinks
work, and some small fixes from Al Viro.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-20 15:48:17 -07:00

184 lines
3.9 KiB
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 <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);
#if 0 /* Need x86_64 debugregs handling */
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;
}
#endif
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);
}
#if 0 /* Need x86_64 debugregs handling */
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];
}
#endif
return put_user(tmp, (unsigned long *) data);
}
void arch_switch(void)
{
/* XXX
printk("arch_switch\n");
*/
}
int is_syscall(unsigned long addr)
{
panic("is_syscall");
}
int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu )
{
panic("dump_fpu");
return(1);
}
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:
*/