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metag: ptrace: Implement NT_METAG_TLS

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Implement functionality to get the TLS pointer for the metag
architecture using regsets.

This provides multi-threaded debug support for GDB.

Signed-off-by: Paul Clothier <Paul.Clothier@imgtec.com>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
This commit is contained in:
Paul Clothier
2013-03-19 12:04:43 +00:00
committed by James Hogan
parent 2b8660ed3b
commit 876d6dcdf2
2 changed files with 35 additions and 0 deletions
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34
arch/metag/kernel/ptrace.c
View File

@@ -288,10 +288,36 @@ static int metag_rp_state_set(struct task_struct *target,
return metag_rp_state_copyin(regs, pos, count, kbuf, ubuf); return metag_rp_state_copyin(regs, pos, count, kbuf, ubuf);
} }
static int metag_tls_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
void __user *tls = target->thread.tls_ptr;
return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
}
static int metag_tls_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;
void __user *tls;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
if (ret)
return ret;
target->thread.tls_ptr = tls;
return ret;
}
enum metag_regset { enum metag_regset {
REGSET_GENERAL, REGSET_GENERAL,
REGSET_CBUF, REGSET_CBUF,
REGSET_READPIPE, REGSET_READPIPE,
REGSET_TLS,
}; };
static const struct user_regset metag_regsets[] = { static const struct user_regset metag_regsets[] = {
@@ -319,6 +345,14 @@ static const struct user_regset metag_regsets[] = {
.get = metag_rp_state_get, .get = metag_rp_state_get,
.set = metag_rp_state_set, .set = metag_rp_state_set,
}, },
[REGSET_TLS] = {
.core_note_type = NT_METAG_TLS,
.n = 1,
.size = sizeof(void *),
.align = sizeof(void *),
.get = metag_tls_get,
.set = metag_tls_set,
},
}; };
static const struct user_regset_view user_metag_view = { static const struct user_regset_view user_metag_view = {

1
include/uapi/linux/elf.h
View File

@@ -397,6 +397,7 @@ typedef struct elf64_shdr {
#define NT_ARM_HW_WATCH 0x403 /* ARM hardware watchpoint registers */ #define NT_ARM_HW_WATCH 0x403 /* ARM hardware watchpoint registers */
#define NT_METAG_CBUF 0x500 /* Metag catch buffer registers */ #define NT_METAG_CBUF 0x500 /* Metag catch buffer registers */
#define NT_METAG_RPIPE 0x501 /* Metag read pipeline state */ #define NT_METAG_RPIPE 0x501 /* Metag read pipeline state */
#define NT_METAG_TLS 0x502 /* Metag TLS pointer */
/* Note header in a PT_NOTE section */ /* Note header in a PT_NOTE section */