2007-10-16 02:27:00 -06:00
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/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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2005-04-16 16:20:36 -06:00
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* Licensed under the GPL
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*/
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2006-03-27 02:14:34 -07:00
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#include "linux/mm.h"
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2007-10-16 02:27:00 -06:00
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#include "linux/sched.h"
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2005-04-16 16:20:36 -06:00
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#include "asm/uaccess.h"
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2007-10-16 02:26:58 -06:00
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extern int arch_switch_tls(struct task_struct *from, struct task_struct *to);
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void arch_switch_to(struct task_struct *from, struct task_struct *to)
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2005-04-16 16:20:36 -06:00
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{
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2007-10-16 02:26:58 -06:00
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int err = arch_switch_tls(from, to);
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2006-03-31 03:30:24 -07:00
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if (!err)
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return;
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if (err != -EINVAL)
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2007-10-16 02:27:00 -06:00
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printk(KERN_WARNING "arch_switch_tls failed, errno %d, "
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"not EINVAL\n", -err);
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2006-03-31 03:30:24 -07:00
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else
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2007-10-16 02:26:58 -06:00
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printk(KERN_WARNING "arch_switch_tls failed, errno = EINVAL\n");
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2005-04-16 16:20:36 -06:00
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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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2007-10-16 02:27:00 -06:00
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if (n) {
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2006-03-27 02:14:34 -07:00
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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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2007-10-16 02:27:00 -06:00
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if (n != sizeof(instr)) {
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printk(KERN_ERR "is_syscall : failed to read "
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"instruction from 0x%lx\n", addr);
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return 1;
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2006-03-27 02:14:34 -07:00
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}
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2005-04-16 16:20:36 -06:00
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}
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/* int 0x80 or sysenter */
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2007-10-16 02:27:00 -06:00
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return (instr == 0x80cd) || (instr == 0x340f);
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2005-04-16 16:20:36 -06:00
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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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#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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[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>
2005-05-06 22:30:46 -06:00
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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 02:27:00 -06:00
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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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(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))
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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>
2005-05-06 22:30:46 -06:00
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}
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2005-04-16 16:20:36 -06:00
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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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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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2007-10-16 02:27:00 -06:00
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/* read the word at location addr in the USER area. */
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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>
2005-05-06 22:30:46 -06:00
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int peek_user(struct task_struct *child, long addr, long data)
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{
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2006-03-31 03:30:15 -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>
2005-05-06 22:30:46 -06:00
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2006-03-31 03:30:15 -07:00
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if ((addr & 3) || addr < 0)
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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>
2005-05-06 22:30:46 -06:00
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2006-03-31 03:30:15 -07:00
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tmp = 0; /* Default return condition */
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2007-10-16 02:27:00 -06:00
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if (addr < MAX_REG_OFFSET) {
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2006-03-31 03:30:15 -07:00
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tmp = getreg(child, addr);
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}
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2007-10-16 02:27:00 -06:00
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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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2006-03-31 03:30:15 -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 __user *) data);
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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>
2005-05-06 22:30:46 -06:00
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}
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2005-04-16 16:20:36 -06:00
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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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2007-10-16 02:26:56 -06:00
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return 0;
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2005-04-16 16:20:36 -06:00
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}
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2007-10-16 02:27:00 -06:00
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static inline int convert_fxsr_from_user(struct pt_regs *regs,
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2005-04-16 16:20:36 -06:00
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struct _fpstate __user *buf)
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{
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2007-10-16 02:26:56 -06:00
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return 0;
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2005-04-16 16:20:36 -06:00
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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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2007-10-16 02:27:00 -06:00
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if (err)
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return -EFAULT;
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return 0;
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2005-04-16 16:20:36 -06:00
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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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2007-10-16 02:27:00 -06:00
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err = convert_fxsr_from_user(&child->thread.regs,
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2005-04-16 16:20:36 -06:00
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(struct _fpstate __user *) buf);
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2007-10-16 02:27:00 -06:00
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if (err)
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return -EFAULT;
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return 0;
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2005-04-16 16:20:36 -06:00
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}
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int get_fpxregs(unsigned long buf, struct task_struct *tsk)
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{
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2007-10-16 02:26:56 -06:00
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return 0;
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2005-04-16 16:20:36 -06:00
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}
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int set_fpxregs(unsigned long buf, struct task_struct *tsk)
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{
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2007-10-16 02:26:56 -06:00
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return 0;
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2005-04-16 16:20:36 -06:00
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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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2007-10-16 02:27:00 -06:00
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return 1;
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2005-04-16 16:20:36 -06:00
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}
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#endif
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int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu )
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{
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2007-10-16 02:26:56 -06:00
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return 1;
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2005-04-16 16:20:36 -06:00
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}
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