bd32e85164
We enabled interrupts before getting the value of cr2 in the handler. If the handler was preempted, cr2 could have been overriden by a page fault in a separate thread or process.
62 lines
870 B
ArmAsm
62 lines
870 B
ArmAsm
.macro interrupt_enter
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push %rbp
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push %r15
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push %r14
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push %r13
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push %r12
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push %r11
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push %r10
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push %r9
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push %r8
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push %rdi
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push %rsi
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push %rdx
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push %rcx # (Return Address)
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push %rbx
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push %rax
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mov %cr2, %rax
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push %rax
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.endm
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.macro interrupt_exit
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add $8, %rsp
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pop %rax
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pop %rbx
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pop %rcx
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pop %rdx
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pop %rsi
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pop %rdi
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pop %r8
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pop %r9
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pop %r10
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pop %r11
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pop %r12
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pop %r13
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pop %r14
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pop %r15
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pop %rbp
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add $8, %rsp # Remove error code.
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.endm
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.macro isr_handler name error_code=0
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.global isr_\name
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isr_\name:
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.if \error_code
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.else
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push $0 # if we don't have an error code, equalize the stack.
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.endif
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interrupt_enter
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sti
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mov %rsp, %rdi
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call interrupt_\name
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cli
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interrupt_exit
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iretq
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.endm
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isr_handler divide_by_zero
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isr_handler protection_fault,1
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isr_handler page_fault,1
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isr_handler timer
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