Mark
105 lines
1.6 KiB
ArmAsm
105 lines
1.6 KiB
ArmAsm
#include "arch/amd64/asm/asm_thread.h"
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#include "arch/amd64/asm/asm_cpu.h"
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.section .text
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.global syscall_entry
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syscall_entry:
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swapgs
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// %rcx - user rip
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// %rsp - user stack
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// %r11 - user rflags
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// Switch to kernel stack
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movq %rsp, get_cpu(CPU_SYSCALL_RSP)
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movq get_cpu(CPU_THREAD), %rsp
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movq THREAD_RSP0(%rsp), %rsp
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cmpq $57, %rax
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jz _syscall_fork
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pushq %rcx
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pushq %r11
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movq get_cpu(CPU_SYSCALL_RSP), %rcx
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pushq %rcx
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cmpq $256, %rax
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jg 1f
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leaq syscall_table(%rip), %rcx
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movq (%rcx, %rax, 8), %rcx
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test %rcx, %rcx
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jz 1f
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movq %rcx, %rax
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movq %r10, %rcx
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// Allow interrupts during all system calls. They may then selectively
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// enter regions where interrupts are disallowed
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sti
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call *%rax
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cli
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jmp 2f
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1:
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movq %rax, %rdi
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call syscall_undefined
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2:
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popq %rdi
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popq %r11
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popq %rcx
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movq get_cpu(CPU_THREAD), %rsi
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movq %rsp, THREAD_RSP0(%rsi)
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movq %rdi, %rsp
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swapgs
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sysretq
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_syscall_fork:
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pushq %rcx
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pushq %r11
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movq get_cpu(CPU_SYSCALL_RSP), %rcx
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pushq %rcx
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pushq %r15
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pushq %r14
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pushq %r13
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pushq %r12
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pushq %rbp
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pushq %rbx
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pushq %r11
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pushq %r10
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pushq %r9
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pushq %r8
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pushq %rcx
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pushq %rdx
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pushq %rsi
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pushq %rdi
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movq %rsp, %rdi
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call sys_fork
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popq %rdi
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popq %rsi
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popq %rdx
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popq %rcx
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popq %r8
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popq %r9
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popq %r10
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popq %r11
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// Return to caller
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popq %rbx
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popq %rbp
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popq %r12
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popq %r13
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popq %r14
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popq %r15
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popq %rdi
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popq %r11
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popq %rcx
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movq %rdi, %rsp
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swapgs
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sysretq
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