path: root/crt/arm/crtn.s
diff options
authorRich Felker <>2012-12-07 23:04:49 -0500
committerRich Felker <>2012-12-07 23:04:49 -0500
commit34aa169dcfa0a2945504fb696dee29bdf989c125 (patch)
tree2e6bf0dcd539583cd361bdcdd74e6f2a7d098258 /crt/arm/crtn.s
parentb8ccf8e46bab6ee9d63a6e392c3b33b9aa89255c (diff)
add support for ctors/dtors on arm with modern gcc
a while back, gcc switched from using the old _init/_fini fragments method for calling ctors and dtors on arm to the __init_array and __fini_array method. unfortunately, on glibc this depends on ugly hacks involving making a linker script and pulling parts of libc into the main program binary. so I cheat a little bit, and just write asm to iterate over the init/fini arrays from the _init/_fini asm. the same approach could be used on any arch it's needed on, but for now arm is the only one.
Diffstat (limited to 'crt/arm/crtn.s')
1 files changed, 20 insertions, 2 deletions
diff --git a/crt/arm/crtn.s b/crt/arm/crtn.s
index 5d5d6454..928e0686 100644
--- a/crt/arm/crtn.s
+++ b/crt/arm/crtn.s
@@ -1,11 +1,29 @@
+.weak __init_array_start
+.weak __init_array_end
.section .init
- pop {lr}
+ adr lr, 1f
+ ldr r4, 2f
+ ldr r5, 2f+4
+ add r4, r4, lr
+ add r5, r5, lr
+1: adr lr, 1b
+ cmp r4, r5
+ beq 3f
+ ldmia r4!, {r3}
+ ldm sp, {r0,r1,r2}
+ tst r3,#1
+ moveq pc,r3
+ bx r3
+3: pop {r0,r1,r2,r4,r5,lr}
tst lr,#1
moveq pc,lr
bx lr
+2: .word __init_array_start-1b
+ .word __init_array_end-1b
.section .fini
- pop {lr}
+ pop {r4,r5,r6,lr}
tst lr,#1
moveq pc,lr
bx lr