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Core exception handling w or wo err code

This commit is contained in:
Mathieu Maret 2021-10-26 20:22:10 +02:00
parent 75dbbdb53b
commit 3fb667d62e
2 changed files with 119 additions and 43 deletions
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160
arch/x86/exception_wrappers.S
View File

@ -22,36 +22,108 @@
.type exception_wrapper_\id,@function
/* INTERRUPT FRAME START */
/* ALREADY PUSHED TO US BY THE PROCESSOR UPON ENTRY TO THIS INTERRUPT */
/* uint32_t ip */
/* uint32_t cs; */
/* uint32_t flags */
/* uint32_t cs; */
/* uint32_t ip */
/* Pushes the other reg to save same and look like a struct cpu_state*/
/* Fake error code */
pushl $0
pushl $0
/* Backup the actual context */
pushl %ebp
movl %esp, %ebp
/* 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
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
/* 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 */
call thread_prepare_exception_switch_back
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 */
/* 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
push %esp
pushl $\id
@ -72,30 +144,32 @@
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
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
/*List of exception w or w/o err codehttps://wiki.osdev.org/Exceptions*/
.irp exception_id, 8, 10, 11, 12, 13, 14, 17, 30
exception_mac_with_errcode exception_id
.endr
.set i, 0
.rept 0x20
exception_mac %i
.set i, i+1
.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
.endr
.macro ref_exception_wrapper id

2
debug.gdb
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@ -1,3 +1,5 @@
add-symbol-file kernel.sym
source custom_gdb_extension.py
#For ASM sources
directory arch/x86/:core
target remote | qemu-system-i386 -S -gdb stdio -kernel kernel -m 16M