214 lines
2.4 KiB
ArmAsm
214 lines
2.4 KiB
ArmAsm
.macro push_userspace
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pushw %gs
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pushw %fs
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pushw %es
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pushw %ds
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pushal
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.endm
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.macro load_kernel_segments
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movw $0x10, %ax
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movw %ax, %ds
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movw %ax, %es
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movw %ax, %fs
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movw $0x28, %ax
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movw %ax, %gs
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.endm
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.macro pop_userspace
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popal
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popw %ds
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popw %es
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popw %fs
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popw %gs
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.endm
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.macro pop_userspace_skip_eax
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popl %edi
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popl %esi
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popl %ebp
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addl $4, %esp
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popl %ebx
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popl %edx
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popl %ecx
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addl $4, %esp
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popw %ds
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popw %es
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popw %fs
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popw %gs
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.endm
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isr_stub:
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push_userspace
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load_kernel_segments
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movl %cr0, %eax; pushl %eax
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movl %cr2, %eax; pushl %eax
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movl %cr3, %eax; pushl %eax
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movl %cr4, %eax; pushl %eax
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movl %esp, %eax // register ptr
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leal 64(%esp), %ebx // interrupt stack ptr
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movl 60(%esp), %ecx // error code
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movl 56(%esp), %edx // isr number
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subl $12, %esp
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pushl %eax
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pushl %ebx
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pushl %ecx
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pushl %edx
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call cpp_isr_handler
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addl $44, %esp
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pop_userspace
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addl $8, %esp
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iret
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irq_stub:
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push_userspace
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load_kernel_segments
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movl 40(%esp), %eax # interrupt number
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subl $12, %esp
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pushl %eax
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call cpp_irq_handler
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addl $16, %esp
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pop_userspace
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addl $8, %esp
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iret
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.global asm_reschedule_handler
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asm_reschedule_handler:
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push_userspace
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load_kernel_segments
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movl %esp, %eax # interrupt registers ptr
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leal 40(%esp), %ebx # interrupt stack ptr
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subl $12, %esp
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pushl %eax
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pushl %ebx
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call cpp_reschedule_handler
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addl $20, %esp
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pop_userspace
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iret
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// arguments in EAX, EBX, ECX, EDX, ESI, EDI
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.global syscall_asm
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syscall_asm:
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push_userspace
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subl $8, %esp
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pushl %esp
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addl $48, (%esp)
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pushl %edi
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pushl %esi
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pushl %edx
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pushl %ecx
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pushl %ebx
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pushl %eax
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load_kernel_segments
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call cpp_syscall_handler
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addl $36, %esp
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pop_userspace_skip_eax
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iret
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.macro isr n
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.global isr\n
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isr\n:
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pushl $0
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pushl $\n
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jmp isr_stub
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.endm
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.macro isr_err n
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.global isr\n
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isr\n:
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pushl $\n
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jmp isr_stub
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.endm
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.macro irq n
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.global irq\n
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irq\n:
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pushl $0
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pushl $\n
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jmp irq_stub
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.endm
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isr 0
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isr 1
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isr 2
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isr 3
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isr 4
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isr 5
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isr 6
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isr 7
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isr_err 8
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isr 9
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isr_err 10
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isr_err 11
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isr_err 12
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isr_err 13
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isr_err 14
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isr 15
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isr 16
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isr_err 17
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isr 18
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isr 19
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isr 20
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isr 21
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isr 22
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isr 23
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isr 24
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isr 25
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isr 26
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isr 27
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isr 28
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isr 29
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isr 30
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isr 31
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irq 0
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irq 1
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irq 2
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irq 3
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irq 4
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irq 5
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irq 6
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irq 7
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irq 8
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irq 9
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irq 10
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irq 11
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irq 12
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irq 13
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irq 14
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irq 15
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irq 16
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irq 17
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irq 18
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irq 19
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irq 20
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irq 21
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irq 22
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irq 23
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irq 24
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irq 25
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irq 26
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irq 27
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irq 28
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irq 29
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irq 30
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irq 31
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