matos/arch/x86/exception_wrappers.S

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ArmAsm
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#define ASM_SOURCE 1
#include "segment.h"
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.file "irq_wrappers.S"
.text
.extern exception_handler_wrap
.globl exception_handler_wrapper_array
/** Update the kernel TSS in case we are switching to a thread in user
mode in order to come back into the correct kernel stack */
.extern cpu_context_update_kernel_tss
/* The address of the function to call to set back the user thread's
MMU configuration upon return to user context */
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.extern threadPrepareExceptionSwitchBack
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.altmacro
.macro exception_mac id
exception_wrapper_\id:
.type exception_wrapper_\id,@function
/* INTERRUPT FRAME START */
/* ALREADY PUSHED TO US BY THE PROCESSOR UPON ENTRY TO THIS INTERRUPT */
/* uint32_t flags */
/* uint32_t cs; */
/* uint32_t ip */
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/* Pushes the other reg to save same and look like a struct cpu_state*/
/* Fake error code */
pushl $0
/* Backup the actual context */
pushl %ebp
movl %esp, %ebp
pushl %eax
pushl %ecx
pushl %edx
pushl %ebx
pushl %esi
pushl %edi
subl $2,%esp
pushw %ss
pushw %ds
pushw %es
pushw %fs
pushw %gs
/* Set correct kernel segment descriptors' value */
movw $BUILD_SEGMENT_REG_VALUE(0, 0, SEG_KDATA), %di
pushw %di ; popw %ds
pushw %di ; popw %es
pushw %di ; popw %fs
pushw %di ; popw %gs
push %esp
pushl $\id
call exception_handler_wrap
addl $8, %esp
/* Reconfigure the MMU if needed */
pushl %esp /* cpu_ctxt */
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call threadPrepareExceptionSwitchBack
addl $4, %esp /* Unallocate the stack */
/* Prepare kernel TSS in case we are switching to a
user thread: we make sure that we will come back
into the kernel at a correct stack location */
pushl %esp /* Pass the location of the context we are
restoring to the function */
call cpu_context_update_kernel_tss
addl $4, %esp
/* Restore the context */
popw %gs
popw %fs
popw %es
popw %ds
popw %ss
addl $2,%esp
popl %edi
popl %esi
popl %ebx
popl %edx
popl %ecx
popl %eax
popl %ebp
/* Remove fake error code */
addl $4, %esp
iret
.endm
.macro exception_mac_with_errcode id
exception_wrapper_\id:
.type exception_wrapper_\id,@function
/* INTERRUPT FRAME START */
/* ALREADY PUSHED TO US BY THE PROCESSOR UPON ENTRY TO THIS INTERRUPT */
/* uint32_t flags */
/* uint32_t cs; */
/* uint32_t ip */
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/* uint32_t errcode */
/* Pushes the other reg to save same and look like a struct cpu_state*/
/* Backup the actual context */
pushl %ebp
movl %esp, %ebp
pushl %eax
pushl %ecx
pushl %edx
pushl %ebx
pushl %esi
pushl %edi
subl $2,%esp
pushw %ss
pushw %ds
pushw %es
pushw %fs
pushw %gs
/* Set correct kernel segment descriptors' value */
movw $BUILD_SEGMENT_REG_VALUE(0, 0, SEG_KDATA), %di
pushw %di ; popw %ds
pushw %di ; popw %es
pushw %di ; popw %fs
pushw %di ; popw %gs
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push %esp
pushl $\id
call exception_handler_wrap
addl $8, %esp
/* Reconfigure the MMU if needed */
pushl %esp /* cpu_ctxt */
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call threadPrepareExceptionSwitchBack
addl $4, %esp /* Unallocate the stack */
/* Prepare kernel TSS in case we are switching to a
user thread: we make sure that we will come back
into the kernel at a correct stack location */
pushl %esp /* Pass the location of the context we are
restoring to the function */
call cpu_context_update_kernel_tss
addl $4, %esp
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/* Restore the context */
popw %gs
popw %fs
popw %es
popw %ds
popw %ss
addl $2,%esp
popl %edi
popl %esi
popl %ebx
popl %edx
popl %ecx
popl %eax
popl %ebp
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/* Error code isn't compatible with iretd */
addl $4, %esp
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iret
.endm
/* List of exception w or w/o err code https://wiki.osdev.org/Exceptions */
.irp exception_id, 8, 10, 11, 12, 13, 14, 17, 30
exception_mac_with_errcode exception_id
.endr
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.irp exception_id, 0, 1, 2, 3, 4, 5, 6, 7, 9, 15, 16, 18, 19, 20 21, 22, 23, 24, 25, 26, 27, 28, 29, 31
exception_mac exception_id
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.endr
.macro ref_exception_wrapper id
.long exception_wrapper_\id
.endm
.section ".rodata"
.p2align 5, 0x0
exception_handler_wrapper_array:
.set i, 0x0
.rept 0x20
ref_exception_wrapper %i
.set i, i+1
.endr