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xtensa: implement tracehook functions and enable HAVE_ARCH_TRACEHOOK

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Implement syscall_get_nr, syscall_rollback, syscall_get_error,
syscall_{get,set}_return_value and syscall_{get,set}_arguments.
Select HAVE_ARCH_TRACEHOOK as Xtensa now has all support for that.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2018-11-09 15:45:53 -08:00
parent 921534473a
commit 9f24f3c106
2 changed files with 80 additions and 1 deletions
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1
arch/xtensa/Kconfig
View File

@ -18,6 +18,7 @@ config XTENSA
select GENERIC_SCHED_CLOCK
select GENERIC_STRNCPY_FROM_USER if KASAN
select HAVE_ARCH_KASAN if MMU
select HAVE_ARCH_TRACEHOOK
select HAVE_DEBUG_KMEMLEAK
select HAVE_DMA_CONTIGUOUS
select HAVE_EXIT_THREAD

80
arch/xtensa/include/asm/syscall.h
View File

@ -10,6 +10,8 @@
#ifndef _ASM_SYSCALL_H
#define _ASM_SYSCALL_H
#include <linux/err.h>
#include <asm/ptrace.h>
#include <uapi/linux/audit.h>
static inline int syscall_get_arch(void)
@ -17,7 +19,83 @@ static inline int syscall_get_arch(void)
return AUDIT_ARCH_XTENSA;
}
struct pt_regs;
static inline long syscall_get_nr(struct task_struct *task,
struct pt_regs *regs)
{
return regs->syscall;
}
static inline void syscall_rollback(struct task_struct *task,
struct pt_regs *regs)
{
/* Do nothing. */
}
static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{
/* 0 if syscall succeeded, otherwise -Errorcode */
return IS_ERR_VALUE(regs->areg[2]) ? regs->areg[2] : 0;
}
static inline long syscall_get_return_value(struct task_struct *task,
struct pt_regs *regs)
{
return regs->areg[2];
}
static inline void syscall_set_return_value(struct task_struct *task,
struct pt_regs *regs,
int error, long val)
{
regs->areg[0] = (long) error ? error : val;
}
#define SYSCALL_MAX_ARGS 6
#define XTENSA_SYSCALL_ARGUMENT_REGS {6, 3, 4, 5, 8, 9}
static inline void syscall_get_arguments(struct task_struct *task,
struct pt_regs *regs,
unsigned int i, unsigned int n,
unsigned long *args)
{
static const unsigned int reg[] = XTENSA_SYSCALL_ARGUMENT_REGS;
unsigned int j;
if (n == 0)
return;
WARN_ON_ONCE(i + n > SYSCALL_MAX_ARGS);
for (j = 0; j < n; ++j) {
if (i + j < SYSCALL_MAX_ARGS)
args[j] = regs->areg[reg[i + j]];
else
args[j] = 0;
}
}
static inline void syscall_set_arguments(struct task_struct *task,
struct pt_regs *regs,
unsigned int i, unsigned int n,
const unsigned long *args)
{
static const unsigned int reg[] = XTENSA_SYSCALL_ARGUMENT_REGS;
unsigned int j;
if (n == 0)
return;
if (WARN_ON_ONCE(i + n > SYSCALL_MAX_ARGS)) {
if (i < SYSCALL_MAX_ARGS)
n = SYSCALL_MAX_ARGS - i;
else
return;
}
for (j = 0; j < n; ++j)
regs->areg[reg[i + j]] = args[j];
}
asmlinkage long xtensa_rt_sigreturn(struct pt_regs*);
asmlinkage long xtensa_shmat(int, char __user *, int);