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arch/tile: implement user_regset interface on tile 

This is a basic implementation of user_regset for the tile
architecture. It reuses the basic blocks that were already there.

Signed-off-by: Simon Marchi <simon.marchi@polymtl.ca>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Simon Marchi 2012-12-17 20:08:09 -05:00 committed by Chris Metcalf
parent 395e095ed9
commit 7be68284bd
1 changed files with 62 additions and 0 deletions
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62
arch/tile/kernel/ptrace.c
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@ -19,7 +19,10 @@
#include <linux/kprobes.h>
#include <linux/compat.h>
#include <linux/uaccess.h>
#include <linux/regset.h>
#include <linux/elf.h>
#include <asm/traps.h>
#include <arch/chip.h>
void user_enable_single_step(struct task_struct *child)
{
@ -80,6 +83,65 @@ static void putregs(struct task_struct *child, struct pt_regs *uregs)
*regs = *uregs;
}
enum tile_regset {
REGSET_GPR,
};
static int tile_gpr_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
struct pt_regs regs;
getregs(target, &regs);
return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &regs, 0,
sizeof(regs));
}
static int tile_gpr_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
int ret;
struct pt_regs regs;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &regs, 0,
sizeof(regs));
if (ret)
return ret;
putregs(target, &regs);
return 0;
}
static const struct user_regset tile_user_regset[] = {
[REGSET_GPR] = {
.core_note_type = NT_PRSTATUS,
.n = ELF_NGREG,
.size = sizeof(elf_greg_t),
.align = sizeof(elf_greg_t),
.get = tile_gpr_get,
.set = tile_gpr_set,
},
};
static const struct user_regset_view tile_user_regset_view = {
.name = CHIP_ARCH_NAME,
.e_machine = ELF_ARCH,
.ei_osabi = ELF_OSABI,
.regsets = tile_user_regset,
.n = ARRAY_SIZE(tile_user_regset),
};
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
return &tile_user_regset_view;
}
long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{