2005-04-17 05:20:36 +07:00
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/*
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* Copyright 2003 PathScale, Inc.
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2007-10-16 15:27:18 +07:00
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* Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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2005-04-17 05:20:36 +07:00
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*
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* Licensed under the GPL
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*/
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2008-02-05 13:31:20 +07:00
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#include <linux/mm.h>
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2005-05-21 03:59:07 +07:00
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#include <linux/sched.h>
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#include <linux/errno.h>
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2008-02-05 13:31:20 +07:00
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#define __FRAME_OFFSETS
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#include <asm/ptrace.h>
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2005-05-21 03:59:07 +07:00
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#include <asm/uaccess.h>
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2005-04-17 05:20:36 +07:00
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2007-10-16 15:27:18 +07:00
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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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*/
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2005-04-17 05:20:36 +07:00
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#define FLAG_MASK 0x44dd5UL
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int putreg(struct task_struct *child, int regno, unsigned long value)
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{
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unsigned long tmp;
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#ifdef TIF_IA32
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2008-02-05 13:31:20 +07:00
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/*
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* Some code in the 64bit emulation may not be 64bit clean.
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* Don't take any chances.
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*/
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2005-04-17 05:20:36 +07:00
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if (test_tsk_thread_flag(child, TIF_IA32))
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value &= 0xffffffff;
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#endif
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2008-02-05 13:31:20 +07:00
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switch (regno) {
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2005-04-17 05:20:36 +07:00
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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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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 FS_BASE:
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case GS_BASE:
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if (!((value >> 48) == 0 || (value >> 48) == 0xffff))
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return -EIO;
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break;
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case EFLAGS:
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value &= FLAG_MASK;
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tmp = PT_REGS_EFLAGS(&child->thread.regs) & ~FLAG_MASK;
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value |= tmp;
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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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[PATCH] uml: S390 preparation, peekusr/pokeusr defined by subarch
s390 needs to change some parts of arch/um/kernel/ptrace.c. Thus, the code
regarding PEEKUSER and POKEUSER are shifted to arch/um/sys-<subarch>/ptrace.c.
Also s390 debug registers need to be updated, when singlestepping is switched
on / off. Thus, setting/resetting of singlestepping is centralized in the new
function set_singlestep(), which also inserts the macro
SUBARCH_SET_SINGLESTEP(mode), if defined.
Finally, s390 has the "ieee_instruction_pointer" in its
registers, which also is allowed to be read via
ptrace( PTRACE_PEEKUSER, getpid(), PT_IEEE_IP, 0);
To implement this feature, sys_ptrace inserts the macro
SUBARCH_PTRACE_SPECIAL, if defined.
Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-07 11:30:46 +07:00
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int poke_user(struct task_struct *child, long addr, long data)
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{
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2007-10-16 15:27:18 +07:00
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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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2008-02-05 13:31:20 +07:00
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(addr <= offsetof(struct user, u_debugreg[7]))) {
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2007-10-16 15:27:18 +07:00
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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))
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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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[PATCH] uml: S390 preparation, peekusr/pokeusr defined by subarch
s390 needs to change some parts of arch/um/kernel/ptrace.c. Thus, the code
regarding PEEKUSER and POKEUSER are shifted to arch/um/sys-<subarch>/ptrace.c.
Also s390 debug registers need to be updated, when singlestepping is switched
on / off. Thus, setting/resetting of singlestepping is centralized in the new
function set_singlestep(), which also inserts the macro
SUBARCH_SET_SINGLESTEP(mode), if defined.
Finally, s390 has the "ieee_instruction_pointer" in its
registers, which also is allowed to be read via
ptrace( PTRACE_PEEKUSER, getpid(), PT_IEEE_IP, 0);
To implement this feature, sys_ptrace inserts the macro
SUBARCH_PTRACE_SPECIAL, if defined.
Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-07 11:30:46 +07:00
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}
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2005-04-17 05:20:36 +07:00
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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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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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#ifdef TIF_IA32
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if (test_tsk_thread_flag(child, TIF_IA32))
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retval &= 0xffffffff;
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#endif
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}
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return retval;
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}
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[PATCH] uml: S390 preparation, peekusr/pokeusr defined by subarch
s390 needs to change some parts of arch/um/kernel/ptrace.c. Thus, the code
regarding PEEKUSER and POKEUSER are shifted to arch/um/sys-<subarch>/ptrace.c.
Also s390 debug registers need to be updated, when singlestepping is switched
on / off. Thus, setting/resetting of singlestepping is centralized in the new
function set_singlestep(), which also inserts the macro
SUBARCH_SET_SINGLESTEP(mode), if defined.
Finally, s390 has the "ieee_instruction_pointer" in its
registers, which also is allowed to be read via
ptrace( PTRACE_PEEKUSER, getpid(), PT_IEEE_IP, 0);
To implement this feature, sys_ptrace inserts the macro
SUBARCH_PTRACE_SPECIAL, if defined.
Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-07 11:30:46 +07:00
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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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2007-10-16 15:27:18 +07:00
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unsigned long tmp;
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[PATCH] uml: S390 preparation, peekusr/pokeusr defined by subarch
s390 needs to change some parts of arch/um/kernel/ptrace.c. Thus, the code
regarding PEEKUSER and POKEUSER are shifted to arch/um/sys-<subarch>/ptrace.c.
Also s390 debug registers need to be updated, when singlestepping is switched
on / off. Thus, setting/resetting of singlestepping is centralized in the new
function set_singlestep(), which also inserts the macro
SUBARCH_SET_SINGLESTEP(mode), if defined.
Finally, s390 has the "ieee_instruction_pointer" in its
registers, which also is allowed to be read via
ptrace( PTRACE_PEEKUSER, getpid(), PT_IEEE_IP, 0);
To implement this feature, sys_ptrace inserts the macro
SUBARCH_PTRACE_SPECIAL, if defined.
Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-07 11:30:46 +07:00
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2007-10-16 15:27:18 +07:00
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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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2008-02-05 13:31:20 +07:00
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if (addr < MAX_REG_OFFSET)
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2007-10-16 15:27:18 +07:00
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tmp = getreg(child, addr);
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else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
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2008-02-05 13:31:20 +07:00
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(addr <= offsetof(struct user, u_debugreg[7]))) {
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2007-10-16 15:27:18 +07:00
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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 *) data);
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2005-04-17 05:20:36 +07:00
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}
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2006-03-27 16:14:34 +07:00
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/* XXX Mostly copied from sys-i386 */
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2005-04-17 05:20:36 +07:00
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int is_syscall(unsigned long addr)
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{
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2006-03-27 16:14:34 +07:00
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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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2008-02-05 13:31:20 +07:00
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if (n) {
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/*
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* access_process_vm() grants access to vsyscall and stub,
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2006-03-27 16:14:34 +07:00
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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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2007-10-16 15:27:18 +07:00
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if (n != sizeof(instr)) {
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2006-03-27 16:14:34 +07:00
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printk("is_syscall : failed to read instruction from "
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"0x%lx\n", addr);
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2007-10-16 15:27:18 +07:00
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return 1;
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2006-03-27 16:14:34 +07:00
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}
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}
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/* sysenter */
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2007-10-16 15:27:18 +07:00
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return instr == 0x050f;
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2005-04-17 05:20:36 +07:00
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}
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2007-10-16 15:27:16 +07:00
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int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
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2005-04-17 05:20:36 +07:00
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{
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2007-10-16 15:27:16 +07:00
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int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
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long fpregs[HOST_FP_SIZE];
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2005-04-17 05:20:36 +07:00
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2007-10-16 15:27:16 +07:00
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BUG_ON(sizeof(*buf) != sizeof(fpregs));
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err = save_fp_registers(userspace_pid[cpu], fpregs);
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if (err)
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return err;
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2007-10-29 11:36:10 +07:00
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n = copy_to_user(buf, fpregs, sizeof(fpregs));
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2008-02-05 13:31:20 +07:00
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if (n > 0)
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2007-10-16 15:27:16 +07:00
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return -EFAULT;
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return n;
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2005-04-17 05:20:36 +07:00
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}
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2007-10-16 15:27:16 +07:00
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int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
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2005-04-17 05:20:36 +07:00
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{
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2007-10-16 15:27:16 +07:00
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int n, cpu = ((struct thread_info *) child->stack)->cpu;
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long fpregs[HOST_FP_SIZE];
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BUG_ON(sizeof(*buf) != sizeof(fpregs));
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2007-10-29 11:36:10 +07:00
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n = copy_from_user(fpregs, buf, sizeof(fpregs));
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2007-10-16 15:27:16 +07:00
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if (n > 0)
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return -EFAULT;
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return restore_fp_registers(userspace_pid[cpu], fpregs);
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2005-04-17 05:20:36 +07:00
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}
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2010-10-28 05:33:47 +07:00
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long subarch_ptrace(struct task_struct *child, long request,
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unsigned long addr, unsigned long data)
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2005-04-17 05:20:36 +07:00
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{
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2007-10-16 15:27:16 +07:00
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int ret = -EIO;
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2010-10-28 05:34:04 +07:00
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void __user *datap = (void __user *) data;
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2007-10-16 15:27:16 +07:00
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switch (request) {
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case PTRACE_GETFPXREGS: /* Get the child FPU state. */
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2010-10-28 05:34:04 +07:00
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ret = get_fpregs(datap, child);
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2007-10-16 15:27:16 +07:00
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break;
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case PTRACE_SETFPXREGS: /* Set the child FPU state. */
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2010-10-28 05:34:04 +07:00
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ret = set_fpregs(datap, child);
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2007-10-16 15:27:16 +07:00
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break;
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}
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return ret;
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2005-04-17 05:20:36 +07:00
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}
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