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* [glibc] riscv: add support for static PIE
@ 2024-01-22 14:00 Andreas Schwab
0 siblings, 0 replies; only message in thread
From: Andreas Schwab @ 2024-01-22 14:00 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=6edaa12b41a373f249469d7b516d2043f81aea37
commit 6edaa12b41a373f249469d7b516d2043f81aea37
Author: Andreas Schwab <schwab@suse.de>
Date: Wed Jan 17 15:35:57 2024 +0100
riscv: add support for static PIE
In order to support static PIE the startup code must avoid relocations
before __libc_start_main is called.
Diff:
---
sysdeps/riscv/start.S | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/sysdeps/riscv/start.S b/sysdeps/riscv/start.S
index 0a1f713742..ede186ef23 100644
--- a/sysdeps/riscv/start.S
+++ b/sysdeps/riscv/start.S
@@ -50,7 +50,13 @@ ENTRY (ENTRY_POINT)
call load_gp
mv a5, a0 /* rtld_fini. */
/* main may be in a shared library. */
+#if defined PIC && !defined SHARED
+ /* Avoid relocation in static PIE since _start is called before it
+ is relocated. */
+ lla a0, __wrap_main
+#else
la a0, main
+#endif
REG_L a1, 0(sp) /* argc. */
addi a2, sp, SZREG /* argv. */
andi sp, sp, ALMASK /* Align stack. */
@@ -62,6 +68,11 @@ ENTRY (ENTRY_POINT)
ebreak
END (ENTRY_POINT)
+#if defined PIC && !defined SHARED
+__wrap_main:
+ tail main@plt
+#endif
+
/* Dynamic links need the global pointer to be initialized prior to calling
any shared library's initializers, so we use preinit_array to load it.
This doesn't cut it for static links, though, since the global pointer
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