[RFC PATCH v2 22/24] s390/ptrace: Provide frame_pointer()
Jens Remus <[email protected]>
| Newsgroups | org.kernel.vger.linux-trace-kernel,org.kernel.vger.linux-kernel,org.kernel.vger.linux-s390 |
|---|---|
| Message-ID | <[email protected]> |
On s390 64-bit the s390x ELF ABI [1] designates register 11 as the "preferred" frame pointer (FP) register in user space. [1]: s390x ELF ABI, https://github.com/IBM/s390x-abi/releases Signed-off-by: Jens Remus <[email protected]> --- Notes (jremus): Cherry-picked from "[PATCH v4 00/12] s390: SFrame user space unwinding" series and adjusted to .eh_frame: https://lore.kernel.org/all/[email protected]/ arch/s390/include/asm/ptrace.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/s390/include/asm/ptrace.h b/arch/s390/include/asm/ptrace.h index 495e310c3d6d..85765979a595 100644 --- a/arch/s390/include/asm/ptrace.h +++ b/arch/s390/include/asm/ptrace.h @@ -255,6 +255,12 @@ static __always_inline unsigned long user_stack_pointer(const struct pt_regs *re return regs->gprs[15]; } +static __always_inline unsigned long frame_pointer(const struct pt_regs *regs) +{ + /* Return ABI-designated "preferred" frame-pointer register value. */ + return regs->gprs[11]; +} + static __always_inline unsigned long regs_get_register(const struct pt_regs *regs, unsigned int offset) { -- 2.53.0