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| author | Ada Christine <adachristine18@gmail.com> | 2021-04-11 09:05:25 +0000 |
|---|---|---|
| committer | Ada Christine <adachristine18@gmail.com> | 2021-04-11 09:05:25 +0000 |
| commit | 19a91071908c49365290fb1a49a5da8e354989e2 (patch) | |
| tree | 59667272fc339fec1095d9ce8ad383be13bd0b78 /kernel/exceptions.S | |
| parent | 922e6ca1bc48cf62ad599ef1a2d63bf338a0e8c3 (diff) | |
added rule to compile .S files; page fault ISR and skeleton handler are present
Diffstat (limited to 'kernel/exceptions.S')
| -rw-r--r-- | kernel/exceptions.S | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/kernel/exceptions.S b/kernel/exceptions.S new file mode 100644 index 0000000..03402f2 --- /dev/null +++ b/kernel/exceptions.S @@ -0,0 +1,55 @@ +.extern page_fault_handler + +.global page_fault_isr +.type page_fault_isr, @function +page_fault_isr: + /* 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 + /* collect parameters for page fault handler */ + mov 48(%rsp), %rdi /* error code is first parameter */ + mov %cr2, %rsi /* PFLA is next parameter */ + /* caller-saved registers */ + push %rax + push %r10 + push %r11 + /* callee-saved registers */ + push %rbx + push %rbp + push %r12 + push %r13 + push %r14 + push %r15 + /* stack has to be aligned */ + mov %rsp, %rbp + and $-16, %rsp + call page_fault_handler + mov %rbp, %rsp + /* TODO: test for error code here and panic() */ + 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 + /* unwind the error code from the stack */ + add $8, %rsp + /* leave the isr */ + iretq +.size page_fault_isr, . - page_fault_isr + |