kaguya
30 lines
747 B
ArmAsm
30 lines
747 B
ArmAsm
.global syscall_entry
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syscall_entry:
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swapgs
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push %rcx
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push %r11
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# Save original args before we clobber them
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push %rdi # orig rdi (arg1)
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push %rsi # orig rsi (arg2)
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push %rdx # orig rdx (arg3)
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# Handle r8/r9 before r8 gets clobbered
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mov %r8, %r9 # r9 = orig r8 (6th param)
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mov %r10, %r8 # r8 = orig r10 (5th param)
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# Pop in reverse order to place into correct SysV registers
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pop %rcx # rcx = orig rdx (4th param)
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pop %rdx # rdx = orig rsi (3rd param)
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pop %rsi # rsi = orig rdi (2nd param)
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mov %rax, %rdi # rdi = rax (1st param = syscall number)
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call syscall_handler
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pop %r11
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pop %rcx
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swapgs
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sysretq |