In the Hurd ports, _dl_start () does not return the normal way; instead,
_dl_sysdep_start () jumps to _dl_start_user directly using the RETURN_TO
macro. Unlike in the i386 and x86_64 ports, the instruction that was
saving the returned user entry into a different register (to avoid it
getting clobbered by the _dl_init () call) was not marked as a part of
_dl_start_user, causing it to be skipped when jumping to _dl_start_user
using RETURN_TO, and control subsequently getting transferred to a
random address left in x21.
This should not make any difference for Linux ports, other than the
_dl_start_user label pointing to an earlier instruction.
Signed-off-by: Sergey Bugaev <buga...@gmail.com>
---
sysdeps/aarch64/dl-start.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sysdeps/aarch64/dl-start.S b/sysdeps/aarch64/dl-start.S
index d645484e..e35431ca 100644
--- a/sysdeps/aarch64/dl-start.S
+++ b/sysdeps/aarch64/dl-start.S
@@ -29,10 +29,10 @@ ENTRY (_start)
PTR_ARG (0)
bl _dl_start
/* Returns user entry point in x0. */
- mov PTR_REG (21), PTR_REG (0)
.globl _dl_start_user
.type _dl_start_user, %function
_dl_start_user:
+ mov PTR_REG (21), PTR_REG (0)
/* Get argc. */
ldr PTR_REG (1), [sp]
/* Get argv. */
--
2.44.0
