From 404526ee2e58f3c075253943ddc9988f4bd6b80c Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Fri, 30 May 2025 12:40:04 -0300 Subject: [PATCH] sparc: Fix argument passing to __libc_start_main (BZ 32981) sparc start.S does not provide the final argument for __libc_start_main, which is the highest stack address used to update the __libc_stack_end.A This fixes elf/tst-execstack-prog-static-tunable on sparc64. On sparcv9 this does not happen because the kernel puts an auxv value, which turns to point to a value in the stack itself. Checked on sparc64-linux-gnu. Reviewed-by: Florian Weimer --- sysdeps/sparc/sparc32/start.S | 4 ++++ sysdeps/sparc/sparc64/start.S | 4 ++++ 2 files changed, 8 insertions(+) diff --git a/sysdeps/sparc/sparc32/start.S b/sysdeps/sparc/sparc32/start.S index 694b020ce0..cef7c96cac 100644 --- a/sysdeps/sparc/sparc32/start.S +++ b/sysdeps/sparc/sparc32/start.S @@ -73,6 +73,10 @@ _start: be NULL. */ mov %g1, %o5 + /* Provide the highest stack address to update the __libc_stack_end (used + to enable executable stacks if required). */ + st %sp, [%sp+23*4] + /* Let libc do the rest of the initialization, and call main. */ call __libc_start_main nop diff --git a/sysdeps/sparc/sparc64/start.S b/sysdeps/sparc/sparc64/start.S index c9c25c2e47..08e1e77210 100644 --- a/sysdeps/sparc/sparc64/start.S +++ b/sysdeps/sparc/sparc64/start.S @@ -74,6 +74,10 @@ _start: be NULL. */ mov %g1, %o5 + /* Provide the highest stack address to update the __libc_stack_end (used + to enable executable stacks if required). */ + stx %sp, [%sp+STACK_BIAS+22*8] + /* Let libc do the rest of the initialization, and call main. */ call __libc_start_main nop