forked from Bananymous/banan-os
79 lines
1021 B
ArmAsm
79 lines
1021 B
ArmAsm
// arguments in RAX, RBX, RCX, RDX, RSI, RDI
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// System V ABI: RDI, RSI, RDX, RCX, R8, R9
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.global asm_syscall_handler
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asm_syscall_handler:
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pushq %rbx
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pushq %rcx
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pushq %rdx
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pushq %rdi
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pushq %rsi
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pushq %rbp
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pushq %r8
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pushq %r9
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pushq %r10
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pushq %r11
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pushq %r12
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pushq %r13
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pushq %r14
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pushq %r15
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cld
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movq %rsi, %r8
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movq %rdi, %r9
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movq %rax, %rdi
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movq %rbx, %rsi
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xchgq %rcx, %rdx
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leaq 112(%rsp), %rbx
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pushq %rbx
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call cpp_syscall_handler
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addq $8, %rsp
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popq %r15
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popq %r14
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popq %r13
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popq %r12
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popq %r11
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popq %r10
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popq %r9
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popq %r8
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popq %rbp
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popq %rsi
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popq %rdi
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popq %rdx
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popq %rcx
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popq %rbx
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iretq
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.global sys_fork_trampoline
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sys_fork_trampoline:
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pushq %rbx
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pushq %rbp
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pushq %r12
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pushq %r13
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pushq %r14
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pushq %r15
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call read_ip
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testq %rax, %rax
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je .reload_stack
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movq %rax, %rsi
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movq %rsp, %rdi
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call sys_fork
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.done:
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popq %r15
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popq %r14
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popq %r13
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popq %r12
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popq %rbp
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popq %rbx
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ret
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.reload_stack:
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call get_thread_start_sp
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movq %rax, %rsp
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xorq %rax, %rax
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jmp .done
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