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| author | Paul Clothier <Paul.Clothier@imgtec.com> | 2013-03-19 16:04:43 +0400 |
|---|---|---|
| committer | James Hogan <james.hogan@imgtec.com> | 2013-03-27 18:37:47 +0400 |
| commit | 876d6dcdf26a2e860801ec61195e580d03f7b204 (patch) | |
| tree | 33f1145d6f524c75128747c90206ea70487f3b09 | |
| parent | 2b8660ed3bfe95523561e6d6a6f1ce91389006b1 (diff) | |
| download | linux-876d6dcdf26a2e860801ec61195e580d03f7b204.tar.xz | |
metag: ptrace: Implement NT_METAG_TLS
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>
| -rw-r--r-- | arch/metag/kernel/ptrace.c | 34 | ||||
| -rw-r--r-- | include/uapi/linux/elf.h | 1 |
2 files changed, 35 insertions, 0 deletions
diff --git a/arch/metag/kernel/ptrace.c b/arch/metag/kernel/ptrace.c index 47a8828615a5..7563628822bd 100644 --- a/arch/metag/kernel/ptrace.c +++ b/arch/metag/kernel/ptrace.c @@ -288,10 +288,36 @@ static int metag_rp_state_set(struct task_struct *target, 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 { REGSET_GENERAL, REGSET_CBUF, REGSET_READPIPE, + REGSET_TLS, }; static const struct user_regset metag_regsets[] = { @@ -319,6 +345,14 @@ static const struct user_regset metag_regsets[] = { .get = metag_rp_state_get, .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 = { diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h index 8072d352b98f..ef6103bf1f9b 100644 --- a/include/uapi/linux/elf.h +++ b/include/uapi/linux/elf.h @@ -397,6 +397,7 @@ typedef struct elf64_shdr { #define NT_ARM_HW_WATCH 0x403 /* ARM hardware watchpoint registers */ #define NT_METAG_CBUF 0x500 /* Metag catch buffer registers */ #define NT_METAG_RPIPE 0x501 /* Metag read pipeline state */ +#define NT_METAG_TLS 0x502 /* Metag TLS pointer */ /* Note header in a PT_NOTE section */ |