66 lines
823 B
ArmAsm
66 lines
823 B
ArmAsm
/*
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The kernel uses the following registers:
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%rdi, %rsi, %rdx, %r8, %r9, %r10
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The number of the syscall is passed in %rax.
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A syscall clobbers:
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%rax, %rcx, %r11
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The returned value is placed in %rax.
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*/
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.text
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.globl syscall1
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.type syscall1, @function
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syscall1:
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movq %rsi, %rax // Syscall number.
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syscall
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ret
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.globl syscall2
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.type syscall2, @function
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syscall2:
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// Store registers.
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movq %rdi, %r8
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movq %rdx, %rax // Syscall number.
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// Syscall arguments.
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movq %rsi, %rdi
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movq %r8, %rsi
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syscall
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// Restore registers.
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movq %rdi, %rsi
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movq %r8, %rdi
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ret
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.globl syscall3
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.type syscall3, @function
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syscall3:
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// Store registers.
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movq %rdi, %r8
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movq %rcx, %rax // Syscall number.
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// Syscall arguments.
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movq %rdx, %rdi
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movq %r8, %rdx
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syscall
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// Restore registers.
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movq %r8, %rdi
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ret
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