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/*
* linux/kernel/asm.s
*
* (C) 1991 Linus Torvalds
*/
/*
* asm.s contains the low-level code for most hardware faults.
* page_exception is handled by the mm, so that isn't here. This
* file also handles (hopefully) fpu-exceptions due to TS-bit, as
* the fpu must be properly saved/resored. This hasn't been tested.
*/
.globl divide_error,debug,nmi,int3,overflow,bounds,invalid_op
.globl double_fault,coprocessor_segment_overrun
.globl invalid_TSS,segment_not_present,stack_segment
.globl general_protection,coprocessor_error,irq13,reserved
divide_error:
pushl $do_divide_error
no_error_code:
xchgl %eax,(%esp)
pushl %ebx
pushl %ecx
pushl %edx
pushl %edi
pushl %esi
pushl %ebp
push %ds
push %es
push %fs
pushl $0 # "error code"
lea 44(%esp),%edx
pushl %edx
movl $0x10,%edx
mov %dx,%ds
mov %dx,%es
mov %dx,%fs
call *%eax
addl $8,%esp
pop %fs
pop %es
pop %ds
popl %ebp
popl %esi
popl %edi
popl %edx
popl %ecx
popl %ebx
popl %eax
iret
debug:
pushl $do_int3 # _do_debug
jmp no_error_code
nmi:
pushl $do_nmi
jmp no_error_code
int3:
pushl $do_int3
jmp no_error_code
overflow:
pushl $do_overflow
jmp no_error_code
bounds:
pushl $do_bounds
jmp no_error_code
invalid_op:
pushl $do_invalid_op
jmp no_error_code
coprocessor_segment_overrun:
pushl $do_coprocessor_segment_overrun
jmp no_error_code
reserved:
pushl $do_reserved
jmp no_error_code
irq13:
pushl %eax
xorb %al,%al
outb %al,$0xF0
movb $0x20,%al
outb %al,$0x20
jmp 1f
1: jmp 1f
1: outb %al,$0xA0
popl %eax
jmp coprocessor_error
double_fault:
pushl $do_double_fault
error_code:
xchgl %eax,4(%esp) # error code <-> %eax
xchgl %ebx,(%esp) # &function <-> %ebx
pushl %ecx
pushl %edx
pushl %edi
pushl %esi
pushl %ebp
push %ds
push %es
push %fs
pushl %eax # error code
lea 44(%esp),%eax # offset
pushl %eax
movl $0x10,%eax
mov %ax,%ds
mov %ax,%es
mov %ax,%fs
call *%ebx
addl $8,%esp
pop %fs
pop %es
pop %ds
popl %ebp
popl %esi
popl %edi
popl %edx
popl %ecx
popl %ebx
popl %eax
iret
invalid_TSS:
pushl $do_invalid_TSS
jmp error_code
segment_not_present:
pushl $do_segment_not_present
jmp error_code
stack_segment:
pushl $do_stack_segment
jmp error_code
general_protection:
pushl $do_general_protection
jmp error_code
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