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[IA64] utrace syscall.h support for ia64

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Add asm/syscall.h for IA64. Utrace requires this.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Shaohua Li 2008-09-18 15:49:14 +08:00 committed by Tony Luck
parent fec6ed1d1f
commit cfb361f13c
3 changed files with 163 additions and 0 deletions
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6
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

92
arch/ia64/include/asm/syscall.h Normal file
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@ -0,0 +1,92 @@
/*
* 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)
{
BUG_ON(IS_IA32_PROCESS(regs));
if ((long)regs->cr_ifs < 0) /* Not a syscall */
return -1;
return regs->r15;
}
static inline void syscall_rollback(struct task_struct *task,
struct pt_regs *regs)
{
BUG_ON(IS_IA32_PROCESS(regs));
/* do nothing */
}
static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{
BUG_ON(IS_IA32_PROCESS(regs));
return regs->r10 == -1 ? regs->r8:0;
}
static inline long syscall_get_return_value(struct task_struct *task,
struct pt_regs *regs)
{
BUG_ON(IS_IA32_PROCESS(regs));
return regs->r8;
}
static inline void syscall_set_return_value(struct task_struct *task,
struct pt_regs *regs,
int error, long val)
{
BUG_ON(IS_IA32_PROCESS(regs));
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(IS_IA32_PROCESS(regs));
BUG_ON(i + n > 6);
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(IS_IA32_PROCESS(regs));
BUG_ON(i + n > 6);
ia64_syscall_get_set_arguments(task, regs, i, n, args, 1);
}
#endif /* _ASM_SYSCALL_H */

65
arch/ia64/kernel/ptrace.c
View File

@ -2199,3 +2199,68 @@ 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);
}
}