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base/x86_32: preserve EBX value in crt0

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This commit is contained in:
Norman Feske 2014-10-16 20:23:22 +02:00
parent ec954a2278
commit 89e987b22e
1 changed files with 12 additions and 8 deletions
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20
repos/base/src/platform/x86_32/crt0.s
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@ -23,16 +23,17 @@
.global _start
_start:
/* initialize GOT pointer in EBX */
/* save initial register values using GOT-relative addressing */
3:
movl $., %ebx
addl $_GLOBAL_OFFSET_TABLE_ + (. - 3b) , %ebx
movl %esp, __initial_sp@GOTOFF(%ebx)
movl $., %ecx
addl $_GLOBAL_OFFSET_TABLE_ + (. - 3b) , %ecx
movl %esp, __initial_sp@GOTOFF(%ecx)
movl %eax, __initial_ax@GOTOFF(%ecx)
movl %ebx, __initial_bx@GOTOFF(%ecx)
movl %edi, __initial_di@GOTOFF(%ecx)
/* make initial value of some registers available to higher-level code */
mov %esp, __initial_sp
mov %eax, __initial_ax
mov %edi, __initial_di
/* initialize GOT pointer in EBX as expected by the tool chain */
mov %ecx, %ebx
/*
* Install initial temporary environment that is replaced later by the
@ -74,6 +75,9 @@
.global __initial_ax
__initial_ax:
.space 4
.global __initial_bx
__initial_bx:
.space 4
.global __initial_di
__initial_di:
.space 4