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Pull utrace into release branch

This commit is contained in:
Tony Luck 2008-10-17 13:51:16 -07:00
parent 4d4230c27f 680973edf1
commit 9224652cc7
11 changed files with 285 additions and 133 deletions
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1
arch/ia64/Kconfig
View File

@ -21,6 +21,7 @@ config IA64
select HAVE_KRETPROBES
select HAVE_DMA_ATTRS
select HAVE_KVM
select HAVE_ARCH_TRACEHOOK
default y
help
The Itanium Processor Family is Intel's 64-bit successor to

7
arch/ia64/ia32/ia32_entry.S
View File

@ -108,6 +108,11 @@ GLOBAL_ENTRY(ia32_trace_syscall)
;;
st8 [r2]=r3 // initialize return code to -ENOSYS
br.call.sptk.few rp=syscall_trace_enter // give parent a chance to catch syscall args
cmp.lt p6,p0=r8,r0 // check tracehook
adds r2=IA64_PT_REGS_R8_OFFSET+16,sp // r2 = &pt_regs.r8
;;
(p6) st8.spill [r2]=r8 // store return value in slot for r8
(p6) br.spnt.few .ret4
.ret2: // Need to reload arguments (they may be changed by the tracing process)
adds r2=IA64_PT_REGS_R1_OFFSET+16,sp // r2 = &pt_regs.r1
adds r3=IA64_PT_REGS_R13_OFFSET+16,sp // r3 = &pt_regs.r13
@ -199,7 +204,7 @@ ia32_syscall_table:
data8 sys_setuid /* 16-bit version */
data8 sys_getuid /* 16-bit version */
data8 compat_sys_stime /* 25 */
data8 sys32_ptrace
data8 compat_sys_ptrace
data8 sys32_alarm
data8 sys_ni_syscall
data8 sys_pause

83
arch/ia64/ia32/sys_ia32.c
View File

@ -1194,25 +1194,6 @@ sys32_waitpid (int pid, unsigned int *stat_addr, int options)
return compat_sys_wait4(pid, stat_addr, options, NULL);
}
static unsigned int
ia32_peek (struct task_struct *child, unsigned long addr, unsigned int *val)
{
size_t copied;
unsigned int ret;
copied = access_process_vm(child, addr, val, sizeof(*val), 0);
return (copied != sizeof(ret)) ? -EIO : 0;
}
static unsigned int
ia32_poke (struct task_struct *child, unsigned long addr, unsigned int val)
{
if (access_process_vm(child, addr, &val, sizeof(val), 1) != sizeof(val))
return -EIO;
return 0;
}
/*
* The order in which registers are stored in the ptrace regs structure
*/
@ -1510,49 +1491,15 @@ restore_ia32_fpxstate (struct task_struct *tsk, struct ia32_user_fxsr_struct __u
return 0;
}
asmlinkage long
sys32_ptrace (int request, pid_t pid, unsigned int addr, unsigned int data)
long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
compat_ulong_t caddr, compat_ulong_t cdata)
{
struct task_struct *child;
unsigned int value, tmp;
unsigned long addr = caddr;
unsigned long data = cdata;
unsigned int tmp;
long i, ret;
lock_kernel();
if (request == PTRACE_TRACEME) {
ret = ptrace_traceme();
goto out;
}
child = ptrace_get_task_struct(pid);
if (IS_ERR(child)) {
ret = PTR_ERR(child);
goto out;
}
if (request == PTRACE_ATTACH) {
ret = sys_ptrace(request, pid, addr, data);
goto out_tsk;
}
ret = ptrace_check_attach(child, request == PTRACE_KILL);
if (ret < 0)
goto out_tsk;
switch (request) {
case PTRACE_PEEKTEXT:
case PTRACE_PEEKDATA: /* read word at location addr */
ret = ia32_peek(child, addr, &value);
if (ret == 0)
ret = put_user(value, (unsigned int __user *) compat_ptr(data));
else
ret = -EIO;
goto out_tsk;
case PTRACE_POKETEXT:
case PTRACE_POKEDATA: /* write the word at location addr */
ret = ia32_poke(child, addr, data);
goto out_tsk;
case PTRACE_PEEKUSR: /* read word at addr in USER area */
ret = -EIO;
if ((addr & 3) || addr > 17*sizeof(int))
@ -1617,27 +1564,9 @@ sys32_ptrace (int request, pid_t pid, unsigned int addr, unsigned int data)
compat_ptr(data));
break;
case PTRACE_GETEVENTMSG:
ret = put_user(child->ptrace_message, (unsigned int __user *) compat_ptr(data));
break;
case PTRACE_SYSCALL: /* continue, stop after next syscall */
case PTRACE_CONT: /* restart after signal. */
case PTRACE_KILL:
case PTRACE_SINGLESTEP: /* execute chile for one instruction */
case PTRACE_DETACH: /* detach a process */
ret = sys_ptrace(request, pid, addr, data);
break;
default:
ret = ptrace_request(child, request, addr, data);
break;
return compat_ptrace_request(child, request, caddr, cdata);
}
out_tsk:
put_task_struct(child);
out:
unlock_kernel();
return ret;
}

8
arch/ia64/include/asm/ptrace.h
View File

@ -240,6 +240,12 @@ struct switch_stack {
*/
# define instruction_pointer(regs) ((regs)->cr_iip + ia64_psr(regs)->ri)
static inline unsigned long user_stack_pointer(struct pt_regs *regs)
{
/* FIXME: should this be bspstore + nr_dirty regs? */
return regs->ar_bspstore;
}
#define regs_return_value(regs) ((regs)->r8)
/* Conserve space in histogram by encoding slot bits in address
@ -319,6 +325,8 @@ struct switch_stack {
#define arch_has_block_step() (1)
extern void user_enable_block_step(struct task_struct *);
#define __ARCH_WANT_COMPAT_SYS_PTRACE
#endif /* !__KERNEL__ */
/* pt_all_user_regs is used for PTRACE_GETREGS PTRACE_SETREGS */

163
arch/ia64/include/asm/syscall.h Normal file
View File

@ -0,0 +1,163 @@
/*
* Access to user system call parameters and results
*
* Copyright (C) 2008 Intel Corp. Shaohua Li <shaohua.li@intel.com>
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License v.2.
*
* See asm-generic/syscall.h for descriptions of what we must do here.
*/
#ifndef _ASM_SYSCALL_H
#define _ASM_SYSCALL_H 1
#include <linux/sched.h>
#include <linux/err.h>
static inline long syscall_get_nr(struct task_struct *task,
struct pt_regs *regs)
{
if ((long)regs->cr_ifs < 0) /* Not a syscall */
return -1;
#ifdef CONFIG_IA32_SUPPORT
if (IS_IA32_PROCESS(regs))
return regs->r1;
#endif
return regs->r15;
}
static inline void syscall_rollback(struct task_struct *task,
struct pt_regs *regs)
{
#ifdef CONFIG_IA32_SUPPORT
if (IS_IA32_PROCESS(regs))
regs->r8 = regs->r1;
#endif
/* do nothing */
}
static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{
#ifdef CONFIG_IA32_SUPPORT
if (IS_IA32_PROCESS(regs))
return regs->r8;
#endif
return regs->r10 == -1 ? regs->r8:0;
}
static inline long syscall_get_return_value(struct task_struct *task,
struct pt_regs *regs)
{
return regs->r8;
}
static inline void syscall_set_return_value(struct task_struct *task,
struct pt_regs *regs,
int error, long val)
{
#ifdef CONFIG_IA32_SUPPORT
if (IS_IA32_PROCESS(regs)) {
regs->r8 = (long) error ? error : val;
return;
}
#endif
if (error) {
/* error < 0, but ia64 uses > 0 return value */
regs->r8 = -error;
regs->r10 = -1;
} else {
regs->r8 = val;
regs->r10 = 0;
}
}
extern void ia64_syscall_get_set_arguments(struct task_struct *task,
struct pt_regs *regs, unsigned int i, unsigned int n,
unsigned long *args, int rw);
static inline void syscall_get_arguments(struct task_struct *task,
struct pt_regs *regs,
unsigned int i, unsigned int n,
unsigned long *args)
{
BUG_ON(i + n > 6);
#ifdef CONFIG_IA32_SUPPORT
if (IS_IA32_PROCESS(regs)) {
switch (i + n) {
case 6:
if (!n--) break;
*args++ = regs->r13;
case 5:
if (!n--) break;
*args++ = regs->r15;
case 4:
if (!n--) break;
*args++ = regs->r14;
case 3:
if (!n--) break;
*args++ = regs->r10;
case 2:
if (!n--) break;
*args++ = regs->r9;
case 1:
if (!n--) break;
*args++ = regs->r11;
case 0:
if (!n--) break;
default:
BUG();
break;
}
return;
}
#endif
ia64_syscall_get_set_arguments(task, regs, i, n, args, 0);
}
static inline void syscall_set_arguments(struct task_struct *task,
struct pt_regs *regs,
unsigned int i, unsigned int n,
unsigned long *args)
{
BUG_ON(i + n > 6);
#ifdef CONFIG_IA32_SUPPORT
if (IS_IA32_PROCESS(regs)) {
switch (i + n) {
case 6:
if (!n--) break;
regs->r13 = *args++;
case 5:
if (!n--) break;
regs->r15 = *args++;
case 4:
if (!n--) break;
regs->r14 = *args++;
case 3:
if (!n--) break;
regs->r10 = *args++;
case 2:
if (!n--) break;
regs->r9 = *args++;
case 1:
if (!n--) break;
regs->r11 = *args++;
case 0:
if (!n--) break;
}
return;
}
#endif
ia64_syscall_get_set_arguments(task, regs, i, n, args, 1);
}
#endif /* _ASM_SYSCALL_H */

3
arch/ia64/include/asm/thread_info.h
View File

@ -87,9 +87,6 @@ struct thread_info {
#define alloc_task_struct() ((struct task_struct *)__get_free_pages(GFP_KERNEL | __GFP_COMP, KERNEL_STACK_SIZE_ORDER))
#define free_task_struct(tsk) free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
#define tsk_set_notify_resume(tsk) \
set_ti_thread_flag(task_thread_info(tsk), TIF_NOTIFY_RESUME)
extern void tsk_clear_notify_resume(struct task_struct *tsk);
#endif /* !__ASSEMBLY */
/*

5
arch/ia64/kernel/entry.S
View File

@ -534,6 +534,11 @@ GLOBAL_ENTRY(ia64_trace_syscall)
stf.spill [r16]=f10
stf.spill [r17]=f11
br.call.sptk.many rp=syscall_trace_enter // give parent a chance to catch syscall args
cmp.lt p6,p0=r8,r0 // check tracehook
adds r2=PT(R8)+16,sp // r2 = &pt_regs.r8
adds r3=PT(R10)+16,sp // r3 = &pt_regs.r10
mov r10=0
(p6) br.cond.sptk strace_error // syscall failed ->
adds r16=PT(F6)+16,sp
adds r17=PT(F7)+16,sp
;;

7
arch/ia64/kernel/perfmon.c
View File

@ -40,6 +40,7 @@
#include <linux/capability.h>
#include <linux/rcupdate.h>
#include <linux/completion.h>
#include <linux/tracehook.h>
#include <asm/errno.h>
#include <asm/intrinsics.h>
@ -3684,7 +3685,7 @@ pfm_restart(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
PFM_SET_WORK_PENDING(task, 1);
tsk_set_notify_resume(task);
set_notify_resume(task);
/*
* XXX: send reschedule if task runs on another CPU
@ -5044,8 +5045,6 @@ pfm_handle_work(void)
PFM_SET_WORK_PENDING(current, 0);
tsk_clear_notify_resume(current);
regs = task_pt_regs(current);
/*
@ -5414,7 +5413,7 @@ pfm_overflow_handler(struct task_struct *task, pfm_context_t *ctx, u64 pmc0, str
* when coming from ctxsw, current still points to the
* previous task, therefore we must work with task and not current.
*/
tsk_set_notify_resume(task);
set_notify_resume(task);
}
/*
* defer until state is changed (shorten spin window). the context is locked

21
arch/ia64/kernel/process.c
View File

@ -28,6 +28,7 @@
#include <linux/delay.h>
#include <linux/kdebug.h>
#include <linux/utsname.h>
#include <linux/tracehook.h>
#include <asm/cpu.h>
#include <asm/delay.h>
@ -160,21 +161,6 @@ show_regs (struct pt_regs *regs)
show_stack(NULL, NULL);
}
void tsk_clear_notify_resume(struct task_struct *tsk)
{
#ifdef CONFIG_PERFMON
if (tsk->thread.pfm_needs_checking)
return;
#endif
if (test_ti_thread_flag(task_thread_info(tsk), TIF_RESTORE_RSE))
return;
clear_ti_thread_flag(task_thread_info(tsk), TIF_NOTIFY_RESUME);
}
/*
* do_notify_resume_user():
* Called from notify_resume_user at entry.S, with interrupts disabled.
*/
void
do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall)
{
@ -203,6 +189,11 @@ do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall)
ia64_do_signal(scr, in_syscall);
}
if (test_thread_flag(TIF_NOTIFY_RESUME)) {
clear_thread_flag(TIF_NOTIFY_RESUME);
tracehook_notify_resume(&scr->pt);
}
/* copy user rbs to kernel rbs */
if (unlikely(test_thread_flag(TIF_RESTORE_RSE))) {
local_irq_enable(); /* force interrupt enable */

112
arch/ia64/kernel/ptrace.c
View File

@ -22,6 +22,7 @@
#include <linux/signal.h>
#include <linux/regset.h>
#include <linux/elf.h>
#include <linux/tracehook.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
@ -603,7 +604,7 @@ void ia64_ptrace_stop(void)
{
if (test_and_set_tsk_thread_flag(current, TIF_RESTORE_RSE))
return;
tsk_set_notify_resume(current);
set_notify_resume(current);
unw_init_running(do_sync_rbs, ia64_sync_user_rbs);
}
@ -613,7 +614,6 @@ void ia64_ptrace_stop(void)
void ia64_sync_krbs(void)
{
clear_tsk_thread_flag(current, TIF_RESTORE_RSE);
tsk_clear_notify_resume(current);
unw_init_running(do_sync_rbs, ia64_sync_kernel_rbs);
}
@ -644,7 +644,7 @@ ptrace_attach_sync_user_rbs (struct task_struct *child)
spin_lock_irq(&child->sighand->siglock);
if (child->state == TASK_STOPPED &&
!test_and_set_tsk_thread_flag(child, TIF_RESTORE_RSE)) {
tsk_set_notify_resume(child);
set_notify_resume(child);
child->state = TASK_TRACED;
stopped = 1;
@ -1232,37 +1232,16 @@ arch_ptrace (struct task_struct *child, long request, long addr, long data)
}
static void
syscall_trace (void)
{
/*
* The 0x80 provides a way for the tracing parent to
* distinguish between a syscall stop and SIGTRAP delivery.
*/
ptrace_notify(SIGTRAP
| ((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
/*
* This isn't the same as continuing with a signal, but it
* will do for normal use. strace only continues with a
* signal if the stopping signal is not SIGTRAP. -brl
*/
if (current->exit_code) {
send_sig(current->exit_code, current, 1);
current->exit_code = 0;
}
}
/* "asmlinkage" so the input arguments are preserved... */
asmlinkage void
asmlinkage long
syscall_trace_enter (long arg0, long arg1, long arg2, long arg3,
long arg4, long arg5, long arg6, long arg7,
struct pt_regs regs)
{
if (test_thread_flag(TIF_SYSCALL_TRACE)
&& (current->ptrace & PT_PTRACED))
syscall_trace();
if (test_thread_flag(TIF_SYSCALL_TRACE))
if (tracehook_report_syscall_entry(&regs))
return -ENOSYS;
/* copy user rbs to kernel rbs */
if (test_thread_flag(TIF_RESTORE_RSE))
@ -1283,6 +1262,7 @@ syscall_trace_enter (long arg0, long arg1, long arg2, long arg3,
audit_syscall_entry(arch, syscall, arg0, arg1, arg2, arg3);
}
return 0;
}
/* "asmlinkage" so the input arguments are preserved... */
@ -1292,6 +1272,8 @@ syscall_trace_leave (long arg0, long arg1, long arg2, long arg3,
long arg4, long arg5, long arg6, long arg7,
struct pt_regs regs)
{
int step;
if (unlikely(current->audit_context)) {
int success = AUDITSC_RESULT(regs.r10);
long result = regs.r8;
@ -1301,10 +1283,9 @@ syscall_trace_leave (long arg0, long arg1, long arg2, long arg3,
audit_syscall_exit(success, result);
}
if ((test_thread_flag(TIF_SYSCALL_TRACE)
|| test_thread_flag(TIF_SINGLESTEP))
&& (current->ptrace & PT_PTRACED))
syscall_trace();
step = test_thread_flag(TIF_SINGLESTEP);
if (step || test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall_exit(&regs, step);
/* copy user rbs to kernel rbs */
if (test_thread_flag(TIF_RESTORE_RSE))
@ -1940,7 +1921,7 @@ gpregs_writeback(struct task_struct *target,
{
if (test_and_set_tsk_thread_flag(target, TIF_RESTORE_RSE))
return 0;
tsk_set_notify_resume(target);
set_notify_resume(target);
return do_regset_call(do_gpregs_writeback, target, regset, 0, 0,
NULL, NULL);
}
@ -2199,3 +2180,68 @@ const struct user_regset_view *task_user_regset_view(struct task_struct *tsk)
#endif
return &user_ia64_view;
}
struct syscall_get_set_args {
unsigned int i;
unsigned int n;
unsigned long *args;
struct pt_regs *regs;
int rw;
};
static void syscall_get_set_args_cb(struct unw_frame_info *info, void *data)
{
struct syscall_get_set_args *args = data;
struct pt_regs *pt = args->regs;
unsigned long *krbs, cfm, ndirty;
int i, count;
if (unw_unwind_to_user(info) < 0)
return;
cfm = pt->cr_ifs;
krbs = (unsigned long *)info->task + IA64_RBS_OFFSET/8;
ndirty = ia64_rse_num_regs(krbs, krbs + (pt->loadrs >> 19));
count = 0;
if (in_syscall(pt))
count = min_t(int, args->n, cfm & 0x7f);
for (i = 0; i < count; i++) {
if (args->rw)
*ia64_rse_skip_regs(krbs, ndirty + i + args->i) =
args->args[i];
else
args->args[i] = *ia64_rse_skip_regs(krbs,
ndirty + i + args->i);
}
if (!args->rw) {
while (i < args->n) {
args->args[i] = 0;
i++;
}
}
}
void ia64_syscall_get_set_arguments(struct task_struct *task,
struct pt_regs *regs, unsigned int i, unsigned int n,
unsigned long *args, int rw)
{
struct syscall_get_set_args data = {
.i = i,
.n = n,
.args = args,
.regs = regs,
.rw = rw,
};
if (task == current)
unw_init_running(syscall_get_set_args_cb, &data);
else {
struct unw_frame_info ufi;
memset(&ufi, 0, sizeof(ufi));
unw_init_from_blocked_task(&ufi, task);
syscall_get_set_args_cb(&ufi, &data);
}
}

8
arch/ia64/kernel/signal.c
View File

@ -11,6 +11,7 @@
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/ptrace.h>
#include <linux/tracehook.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/smp.h>
@ -439,6 +440,13 @@ handle_signal (unsigned long sig, struct k_sigaction *ka, siginfo_t *info, sigse
sigaddset(&current->blocked, sig);
recalc_sigpending();
spin_unlock_irq(&current->sighand->siglock);
/*
* Let tracing know that we've done the handler setup.
*/
tracehook_signal_handler(sig, info, ka, &scr->pt,
test_thread_flag(TIF_SINGLESTEP));
return 1;
}