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authorKhem Raj <kraj@mvista.com>2006-11-21 02:50:42 +0000
committerKhem Raj <kraj@mvista.com>2006-11-21 02:50:42 +0000
commitf032ccaa14a3c7bef2fc7ac2e24fd4613fa95428 (patch)
tree5c2f30986d6e3d757c45d57c57735b2363bf66ab
parent4dd72a937aed8056163addafe74fc38fa906db3b (diff)
Use constant pool instead of and adr
instruction in unoptimized builds and thumb: thanks Paul Brook
-rw-r--r--ldso/ldso/arm/dl-sysdep.h26
1 files changed, 11 insertions, 15 deletions
diff --git a/ldso/ldso/arm/dl-sysdep.h b/ldso/ldso/arm/dl-sysdep.h
index c8e1b9851..c5ec891df 100644
--- a/ldso/ldso/arm/dl-sysdep.h
+++ b/ldso/ldso/arm/dl-sysdep.h
@@ -110,24 +110,20 @@ elf_machine_load_address (void)
extern void __dl_start asm ("_dl_start");
Elf32_Addr got_addr = (Elf32_Addr) &__dl_start;
Elf32_Addr pcrel_addr;
-#if !defined __thumb__
+#if defined __OPTIMIZE__ && !defined __thumb__
asm ("adr %0, _dl_start" : "=r" (pcrel_addr));
#else
+ /* A simple adr does not work in Thumb mode because the offset is
+ negative, and for debug builds may be too large. */
int tmp;
- /* The above adr will not work on thumb because it
- * is negative. The only safe way is to temporarily
- * swap to arm.
- */
- asm( ".align 2\n"
- " bx pc\n"
- " nop \n"
- " .arm \n"
- " adr %0, _dl_start\n"
- " .align 2\n"
- " orr %1, pc, #1\n"
- " bx %1\n"
- " .force_thumb\n"
- : "=r" (pcrel_addr), "=&r" (tmp));
+ asm ("adr %1, 1f\n\t"
+ "ldr %0, [%1]\n\t"
+ "add %0, %0, %1\n\t"
+ "b 2f\n\t"
+ ".align 2\n\t"
+ "1: .word _dl_start - 1b\n\t"
+ "2:"
+ : "=r" (pcrel_addr), "=r" (tmp));
#endif
return pcrel_addr - got_addr;
}