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author | David A. Long <dave.long@linaro.org> | 2016-07-08 12:35:45 -0400 |
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committer | Catalin Marinas <catalin.marinas@arm.com> | 2016-07-19 15:03:18 +0100 |
commit | 0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7 (patch) | |
tree | 6937bee29908115d8826297448161ee86c272276 /arch/arm64/include | |
parent | 33688abb2802ff3a230bd2441f765477b94cc89e (diff) | |
download | linux-stable-0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7.tar.gz linux-stable-0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7.tar.bz2 linux-stable-0a8ea52c3eb157dd65e224fc95b7c9c99fcba9f7.zip |
arm64: Add HAVE_REGS_AND_STACK_ACCESS_API feature
Add HAVE_REGS_AND_STACK_ACCESS_API feature for arm64, including supporting
functions and defines.
Signed-off-by: David A. Long <dave.long@linaro.org>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
[catalin.marinas@arm.com: Remove unused functions]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include')
-rw-r--r-- | arch/arm64/include/asm/ptrace.h | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h index a307eb6e7fa8..941e12d235be 100644 --- a/arch/arm64/include/asm/ptrace.h +++ b/arch/arm64/include/asm/ptrace.h @@ -74,6 +74,7 @@ #define COMPAT_PT_DATA_ADDR 0x10004 #define COMPAT_PT_TEXT_END_ADDR 0x10008 #ifndef __ASSEMBLY__ +#include <linux/bug.h> /* sizeof(struct user) for AArch32 */ #define COMPAT_USER_SZ 296 @@ -119,6 +120,8 @@ struct pt_regs { u64 syscallno; }; +#define MAX_REG_OFFSET offsetof(struct pt_regs, pstate) + #define arch_has_single_step() (1) #ifdef CONFIG_COMPAT @@ -147,6 +150,53 @@ struct pt_regs { #define user_stack_pointer(regs) \ (!compat_user_mode(regs) ? (regs)->sp : (regs)->compat_sp) +extern int regs_query_register_offset(const char *name); +extern const char *regs_query_register_name(unsigned int offset); +extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, + unsigned int n); + +/** + * regs_get_register() - get register value from its offset + * @regs: pt_regs from which register value is gotten + * @offset: offset of the register. + * + * regs_get_register returns the value of a register whose offset from @regs. + * The @offset is the offset of the register in struct pt_regs. + * If @offset is bigger than MAX_REG_OFFSET, this returns 0. + */ +static inline u64 regs_get_register(struct pt_regs *regs, unsigned int offset) +{ + u64 val = 0; + + WARN_ON(offset & 7); + + offset >>= 3; + switch (offset) { + case 0 ... 30: + val = regs->regs[offset]; + break; + case offsetof(struct pt_regs, sp) >> 3: + val = regs->sp; + break; + case offsetof(struct pt_regs, pc) >> 3: + val = regs->pc; + break; + case offsetof(struct pt_regs, pstate) >> 3: + val = regs->pstate; + break; + default: + val = 0; + } + + return val; +} + +/* Valid only for Kernel mode traps. */ +static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) +{ + return regs->sp; +} + static inline unsigned long regs_return_value(struct pt_regs *regs) { return regs->regs[0]; |