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.extern page_fault_handler
.extern general_protection_handler
.macro ISR_STORE_REGISTERS
/* just in case something tried to be clever before */
cld
/* push param registers */
push %rdi
push %rsi
push %rdx
push %rcx
push %r8
push %r9
/* caller-saved registers */
push %rax
push %r10
push %r11
/* callee-saved registers */
push %rbx
push %rbp
push %r12
push %r13
push %r14
push %r15
.endm
.macro ISR_RESTORE_REGISTERS
// restore all the registers
pop %r15
pop %r14
pop %r13
pop %r12
pop %rbp
pop %rbx
pop %r11
pop %r10
pop %rax
pop %r9
pop %r8
pop %rcx
pop %rdx
pop %rsi
pop %rdi
.endm
.macro ISR_CALL func
// align the stack for the call to the handler function
mov %rsp, %rbp
and $-16, %rsp
call \func
// restore stack pointer, possibly unaligned
mov %rbp, %rsp
.endm
.hidden page_fault_isr
.global page_fault_isr
.type page_fault_isr, @function
page_fault_isr:
ISR_STORE_REGISTERS
/* collect parameters for page fault handler */
mov 120(%rsp), %rdi /* error code is first parameter */
mov %cr2, %rsi /* PFLA is next parameter */
/* stack has to be aligned */
ISR_CALL page_fault_handler
/* TODO: test for error code here and panic() */
ISR_RESTORE_REGISTERS
/* unwind the error code from the stack */
add $8, %rsp
/* leave the isr */
iretq
.size page_fault_isr, . - page_fault_isr
.hidden general_protection_isr
.global general_protection_isr
.type general_protection_isr, @function
general_protection_isr:
ISR_STORE_REGISTERS
// TODO: parameters?
ISR_CALL general_protection_handler
add $8, %rsp
ISR_RESTORE_REGISTERS
iretq
.size general_protection_isr, . - general_protection_isr
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