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37 lines
1.1 KiB
NASM
37 lines
1.1 KiB
NASM
[SECTION .text]
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[GLOBAL context_switch]
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[GLOBAL context_launch]
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[GLOBAL fake_systemv_abi]
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; context_switch saves the registers in the current context structure
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; and populates the registers from the the next context.
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align 16
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context_switch:
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mov [rsi + 0], rbx
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mov [rsi + 8], rbp
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mov [rsi + 16], r12
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mov [rsi + 24], r13
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mov [rsi + 32], r14
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mov [rsi + 40], r15
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mov [rsi + 48], rsp
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; context_launch populates the register set from the next context structure.
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; It does not save the current registers.
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align 16 ; When only one parameter is used for `align`, it will use NOP
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context_launch:
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mov rbx, [rdi + 0]
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mov rbp, [rdi + 8]
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mov r12, [rdi + 16]
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mov r13, [rdi + 24]
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mov r14, [rdi + 32]
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mov r15, [rdi + 40]
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mov rsp, [rdi + 48]
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ret
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; fake_systemv_abi is used to populate the volatile argument registers used by the systemv abi (rdi, rsi, ...)
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; with values from the non-volatile registers saved within the thread context (r15, r14, ...)
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align 16
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fake_systemv_abi:
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mov rdi, r15
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mov rsi, r14
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ret
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