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