http://sourceware.org/bugzilla/show_bug.cgi?id=15302
Bug #: 15302
Summary: Branching to linker script symbol is resolved to
improperly BLX instruction for cortex-m3
Product: binutils
Version: 2.24 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
AssignedTo: unassig...@sourceware.org
ReportedBy: terry....@arm.com
CC: joey...@arm.com
Classification: Unclassified
Host: i686
Target: cortex-m3
In C file I have a call to function extFunc which is then defined in my linker
script as a script symbol "extFunc = 0x1000 + 1;". In assembly code I got
branch instruction "bl extFunc", but in final image this instruction is
resolved to "blx 0x1000" which is illegal for cortex-m3 and will cause a
HardFault.
Should the ld consider the limitation of cortex-m3 or this is illegal usage
model? Please advise.
Here are steps to reproduce this problem.
My test.c file is:
extern void extFunc (void);
void main (void) {
extFunc ();
}
My link script file is simple as:
extFunc = 0x1000 + 1;
Command to compile the test.c is:
arm-none-eabi-gcc -mthumb -mcpu=cortex-m3 -c test.c
Command to build them together is:
arm-none-eabi-ld test.o -T link.ld
Disassemble the produced file and get:
terguo01@terry-pc01:latest$ ./install-native/bin/arm-none-eabi-objdump -d a.out
a.out: file format elf32-littlearm
Disassembly of section .text:
00000000 <main>:
0: b580 push {r7, lr}
2: af00 add r7, sp, #0
4: f000 effc blx 1000 <main+0x1000>
8: bd80 pop {r7, pc}
a: bf00 nop
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