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authorRich Felker <dalias@aerifal.cx>2013-06-03 17:32:42 -0400
committerRich Felker <dalias@aerifal.cx>2013-06-03 17:32:42 -0400
commita6d272127bb6a2eb09dc182cc39c49e77310ade4 (patch)
tree519a62cc82bbd8b0edb0e886af2623be1653aa41 /crt
parent44b4d09fc0626541ca12cf96f65adc21ab1fc413 (diff)
downloadmusl-a6d272127bb6a2eb09dc182cc39c49e77310ade4.tar.gz
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align stack properly for calling global ctors/dtors on x86[_64]
failure to do so was causing crashes on x86_64 when ctors used SSE,
which was first observed when ctors called variadic functions due to
the SSE prologue code inserted into every variadic function.
Diffstat (limited to 'crt')
-rw-r--r--crt/i386/crti.s2
-rw-r--r--crt/i386/crtn.s2
-rw-r--r--crt/x86_64/crti.s2
-rw-r--r--crt/x86_64/crtn.s2
4 files changed, 8 insertions, 0 deletions
diff --git a/crt/i386/crti.s b/crt/i386/crti.s
index 2eb23ed5..d2682a20 100644
--- a/crt/i386/crti.s
+++ b/crt/i386/crti.s
@@ -1,7 +1,9 @@
 .section .init
 .global _init
 _init:
+	sub $12,%esp
 
 .section .fini
 .global _fini
 _fini:
+	sub $12,%esp
diff --git a/crt/i386/crtn.s b/crt/i386/crtn.s
index 055451ed..f3b61e01 100644
--- a/crt/i386/crtn.s
+++ b/crt/i386/crtn.s
@@ -1,5 +1,7 @@
 .section .init
+	add $12,%esp
 	ret
 
 .section .fini
+	add $12,%esp
 	ret
diff --git a/crt/x86_64/crti.s b/crt/x86_64/crti.s
index 2eb23ed5..4788968b 100644
--- a/crt/x86_64/crti.s
+++ b/crt/x86_64/crti.s
@@ -1,7 +1,9 @@
 .section .init
 .global _init
 _init:
+	push %rax
 
 .section .fini
 .global _fini
 _fini:
+	push %rax
diff --git a/crt/x86_64/crtn.s b/crt/x86_64/crtn.s
index 055451ed..29198b77 100644
--- a/crt/x86_64/crtn.s
+++ b/crt/x86_64/crtn.s
@@ -1,5 +1,7 @@
 .section .init
+	pop %rax
 	ret
 
 .section .fini
+	pop %rax
 	ret