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| author | Andreas Schwab <schwab@suse.de> | 2018-09-25 11:11:27 +0200 |
|---|---|---|
| committer | Andreas Schwab <schwab@suse.de> | 2018-10-30 12:07:25 +0100 |
| commit | 2dd12baa045f25c52b30a34b10f72d51f2605413 (patch) | |
| tree | 0b6533d453252b050dcf19f052a1ccb4d6bf46cb /sysdeps/riscv/start.S | |
| parent | fec8bb7ca93d66cd2b019cfebcee6b3e6560ea36 (diff) | |
| download | glibc-2dd12baa045f25c52b30a34b10f72d51f2605413.tar.gz glibc-2dd12baa045f25c52b30a34b10f72d51f2605413.tar.xz glibc-2dd12baa045f25c52b30a34b10f72d51f2605413.zip | |
RISC-V: properly terminate call chain (bug 23125)
Mark the ra register as undefined in _start, so that unwinding through main works correctly. Also, don't use a tail call so that ra points after the call to __libc_start_main, not after the previous call.
Diffstat (limited to 'sysdeps/riscv/start.S')
| -rw-r--r-- | sysdeps/riscv/start.S | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/sysdeps/riscv/start.S b/sysdeps/riscv/start.S index 4635ddb5eb..2d6f06e630 100644 --- a/sysdeps/riscv/start.S +++ b/sysdeps/riscv/start.S @@ -43,6 +43,10 @@ __libc_start_main wants this in a5. */ ENTRY (ENTRY_POINT) + /* Terminate call stack by noting ra is undefined. Use a dummy + .cfi_label to force starting the FDE. */ + .cfi_label .Ldummy + cfi_undefined (ra) call .Lload_gp mv a5, a0 /* rtld_fini. */ /* main may be in a shared library. */ @@ -54,7 +58,8 @@ ENTRY (ENTRY_POINT) lla a4, __libc_csu_fini mv a6, sp /* stack_end. */ - tail __libc_start_main@plt + call __libc_start_main@plt + ebreak END (ENTRY_POINT) /* Dynamic links need the global pointer to be initialized prior to calling |