On 1/27/25 05:15, 1425075...@qq.com wrote:
From: Liya Huang <1425075...@qq.com>
Refer to the commit a3c101a61348 ("examples: fix building on arm64")
fix for arm32. crt0.S does not even build with
CONFIG_API=y, CONFIG_EXAMPLES=y:
examples/api/crt0.S: Assembler messages:
examples/api/crt0.S:32: Error: lo register required -- `ldr
ip,=search_hint'
examples/api/crt0.S:33: Error: lo register required -- `str sp,[ip]'
examples/api/crt0.S:39: Error: lo register required -- `ldr
ip,=syscall_ptr'
examples/api/crt0.S:40: Error: lo register required -- `ldr pc,[ip]'
make[2]: *** [scripts/Makefile.build:292：examples/api/crt0.o] Error 1
Use valid register names and instructions.
Hello Liva,
Thank you for reporting the issue that you experience and suggesting a
patch.
I am not able to reproduce your problem using
make qemu_arm_defconfig
make menuconfig # to add CONFIG_API=y, CONFIG_EXAMPLES=y
export CROSS_COMPILE=arm-linux-gnueabi-
make
https://developer.arm.com/documentation/den0013/d/Application-Binary-Interfaces/Procedure-Call-Standard
lists IP, SP, PC as aliases for registers R12, R13, R15.
I am using gcc 4.2.0 and binutils 2.43 on Ubuntu 25.04.
Could you, please, share some detail on how to reproduce your issue:
* version of U-Boot (commit in git)
* operating system and architecture
* installed version of gcc and binutils
* used defconfig
* used commands for building
Best regards
Heinrich
Signed-off-by: Liya Huang <1425075...@qq.com>
---
examples/api/crt0.S | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/examples/api/crt0.S b/examples/api/crt0.S
index d2a97557817..d33e1c4aa4d 100644
--- a/examples/api/crt0.S
+++ b/examples/api/crt0.S
@@ -29,15 +29,17 @@ syscall:
.text
.globl _start
_start:
- ldr ip, =search_hint
- str sp, [ip]
+ ldr r0, =search_hint
+ mov r1, sp
+ str r1, [r0]
b main
.globl syscall
syscall:
- ldr ip, =syscall_ptr
- ldr pc, [ip]
+ ldr r0, =syscall_ptr
+ ldr r0, [r0]
+ bx r0
#elif defined(CONFIG_ARM64)
