diff options
Diffstat (limited to 'src/arch/x86/lib/c_start.S')
| -rw-r--r-- | src/arch/x86/lib/c_start.S | 36 |
1 files changed, 24 insertions, 12 deletions
diff --git a/src/arch/x86/lib/c_start.S b/src/arch/x86/lib/c_start.S index 9a8b4ac3c2..295283b24a 100644 --- a/src/arch/x86/lib/c_start.S +++ b/src/arch/x86/lib/c_start.S @@ -1,5 +1,16 @@ #include <cpu/x86/post_code.h> +/* Place the stack in the bss section. It's not necessary to define it in the + * the linker script. */ + .section .bss, "aw", @nobits +.global _stack +.global _estack + +.align CONFIG_STACK_SIZE +_stack: +.space CONFIG_MAX_CPUS*CONFIG_STACK_SIZE +_estack: + .section ".textfirst" .code32 .globl _start @@ -16,19 +27,7 @@ _start: post_code(POST_ENTRY_C_START) /* post 13 */ - /** poison the stack. Code should not count on the - * stack being full of zeros. This stack poisoning - * recently uncovered a bug in the broadcast SIPI - * code. - */ cld - leal _stack, %edi - movl $_estack, %ecx - subl %edi, %ecx - shrl $2, %ecx /* it is 32 bit aligned, right? */ - movl $0xDEADBEEF, %eax - rep - stosl /** clear bss, which unlike the stack is zero by definition */ leal _bss, %edi @@ -41,6 +40,19 @@ _start: stosl .Lnobss: + /** poison the stack. Code should not count on the + * stack being full of zeros. This stack poisoning + * recently uncovered a bug in the broadcast SIPI + * code. + */ + leal _stack, %edi + movl $_estack, %ecx + subl %edi, %ecx + shrl $2, %ecx /* it is 32 bit aligned, right? */ + movl $0xDEADBEEF, %eax + rep + stosl + /* set new stack */ movl $_estack, %esp |