[RFC PATCH v1 23/25] s390/ptrace: Provide frame_pointer()
From: Jens Remus <hidden>
Date: 2026-08-18 14:50:29
Also in:
linux-s390, lkml
Subsystem:
ptrace support, s390 architecture, the rest · Maintainers:
Oleg Nesterov, Heiko Carstens, Vasily Gorbik, Alexander Gordeev, Linus Torvalds
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 <redacted> --- 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/20260127151926.2805123-9-jremus@linux.ibm.com/ (local) 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