glibc/SOURCES/glibc-upstream-2.34-61.patch

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2022-05-17 10:24:40 +00:00
commit aa3a97496c82a8443039248ebee650322c9480f4
Author: Aurelien Jarno <aurelien@aurel32.net>
Date: Thu Dec 16 00:06:28 2021 +0100
riscv: align stack before calling _dl_init [BZ #28703]
Align the stack pointer to 128 bits during the call to _dl_init() as
specified by the RISC-V ABI [1]. This fixes the elf/tst-align2 test.
Fixes bug 28703.
[1] https://github.com/riscv-non-isa/riscv-elf-psabi-doc
(cherry picked from commit 225da459cebef1037dcd78b56471edc0721e1c41)
diff --git a/sysdeps/riscv/dl-machine.h b/sysdeps/riscv/dl-machine.h
index aedf69fcdd8aff50..951268923da26a37 100644
--- a/sysdeps/riscv/dl-machine.h
+++ b/sysdeps/riscv/dl-machine.h
@@ -127,8 +127,14 @@ elf_machine_load_address (void)
sll a3, a1, " STRINGXP (PTRLOG) "\n\
add a3, a3, a2\n\
add a3, a3, " STRINGXP (SZREG) "\n\
+ # Stash the stack pointer in s1.\n\
+ mv s1, sp\n\
+ # Align stack to 128 bits for the _dl_init call.\n\
+ andi sp, sp,-16\n\
# Call the function to run the initializers.\n\
jal _dl_init\n\
+ # Restore the stack pointer for _start.\n\
+ mv sp, s1\n\
# Pass our finalizer function to _start.\n\
lla a0, _dl_fini\n\
# Jump to the user entry point.\n\