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authorRich Felker <dalias@aerifal.cx>2012-02-06 14:39:09 -0500
committerRich Felker <dalias@aerifal.cx>2012-02-06 14:39:09 -0500
commit4ce3cb5cddda7b4ee9643e1f75ee5b8f1f191906 (patch)
tree9861037b39b84ed346e0632aef670bf768786461 /crt/arm
parentf4ad36c4bf23899a3164ebd40ff5781c152bcb01 (diff)
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add support for init/finit (constructors and destructors)
this is mainly in hopes of supporting c++ (not yet possible for other
reasons) but will also help applications/libraries which use (and more
often, abuse) the gcc __attribute__((__constructor__)) feature in "C"
code.

x86_64 and arm versions of the new startup asm are untested and may
have minor problems.
Diffstat (limited to 'crt/arm')
-rw-r--r--crt/arm/crt1.s7
-rw-r--r--crt/arm/crti.s7
-rw-r--r--crt/arm/crtn.s9
3 files changed, 21 insertions, 2 deletions
diff --git a/crt/arm/crt1.s b/crt/arm/crt1.s
index 74b90949..ed2a57a2 100644
--- a/crt/arm/crt1.s
+++ b/crt/arm/crt1.s
@@ -1,13 +1,16 @@
+.weak _init
+.weak _fini
 .global _start
 _start:
 	mov fp,#0
 	mov lr,#0
 	ldr a2,[sp],#4
 	mov a3,sp
-	mov a4,#0
+	ldr a4,=_fini
 	str fp,[sp,#-4]!
 	str a1,[sp,#-4]!
-	str fp,[sp,#-4]!
+	str a4,[sp,#-4]!
+	ldr a4,=_init
 	ldr a1,=main
 	bl __libc_start_main
 1:	b 1b
diff --git a/crt/arm/crti.s b/crt/arm/crti.s
new file mode 100644
index 00000000..2eb23ed5
--- /dev/null
+++ b/crt/arm/crti.s
@@ -0,0 +1,7 @@
+.section .init
+.global _init
+_init:
+
+.section .fini
+.global _fini
+_fini:
diff --git a/crt/arm/crtn.s b/crt/arm/crtn.s
new file mode 100644
index 00000000..9d7107d0
--- /dev/null
+++ b/crt/arm/crtn.s
@@ -0,0 +1,9 @@
+.section .init
+	tst lr,#1
+	moveq pc,lr
+	bx lr
+
+.section .fini
+	tst lr,#1
+	moveq pc,lr
+	bx lr