100 lines
1.7 KiB
ArmAsm
100 lines
1.7 KiB
ArmAsm
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#include "x86-qemu.h"
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.globl __am_kcontext_start
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__am_kcontext_start:
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// eax = arg, ebx = entry
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pushl %eax
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pushl $__am_panic_on_return
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jmpl *%ebx
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trap:
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cli
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subl $20, %esp
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pushl %ebp
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pushl %edi
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pushl %esi
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pushl $0
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pushl %edx
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pushl %ecx
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pushl %ebx
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pushl %eax
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movw %ds, %ax
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pushl %eax
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pushl $0
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movw $KSEL(SEG_KDATA), %ax
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movw %ax, %ds
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movw %ax, %es
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movw %ax, %ss
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pushl %esp
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call __am_irq_handle
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.globl __am_iret
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__am_iret:
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addl $4, %esp
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popl %eax
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movl %eax, %esp
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addl $4, %esp
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popl %eax
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movw %ax, %ds
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movw %ax, %es
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cmpw $KSEL(SEG_KCODE), 36(%esp)
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je .kernel_iret
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.user_iret:
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popl %eax
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popl %ebx
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popl %ecx
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popl %edx
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addl $4, %esp
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popl %esi
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popl %edi
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popl %ebp
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iret
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.kernel_iret:
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popl %eax
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popl %ebx
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popl %ecx
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popl %edx
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addl $4, %esp
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/* stack frame:
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28 ss
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24 esp (not popped by iret when returning to ring0)
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20 eflags ---> move to new-esp
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16 cs
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12 eip
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8 ebp
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4 edi
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0 esi <--- %esp
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*/
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movl %esp, %ebp
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movl 24(%ebp), %edi // %edi is new-esp
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movl 20(%ebp), %esi; movl %esi, -4(%edi)
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movl 16(%ebp), %esi; movl %esi, -8(%edi)
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movl 12(%ebp), %esi; movl %esi, -12(%edi)
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movl 8(%ebp), %esi; movl %esi, -16(%edi)
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movl 4(%ebp), %esi; movl %esi, -20(%edi)
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movl 0(%ebp), %esi; movl %esi, -24(%edi)
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leal -24(%edi), %esp
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popl %esi
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popl %edi
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popl %ebp
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iret
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#define NOERR push $0
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#define ERR
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#define IRQ_DEF(id, dpl, err) \
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.globl __am_irq##id; __am_irq##id: cli; err; push $id; jmp trap;
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IRQS(IRQ_DEF)
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.globl __am_irqall; __am_irqall: cli; push $0; push $-1; jmp trap;
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