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Matheus
67 lines
877 B
NASM
67 lines
877 B
NASM
section .text
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global arch_sched_yieldtrampoline
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; C sysv abi
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; rdi -> thread ptr
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; rsi -> regs ptr
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REGSTRUCTSIZE equ 208
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arch_sched_yieldtrampoline:
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; save return address to save as rip later
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pop r10
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; save rsp to reuse later
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mov r11, rsp
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; temporarily change rsp to set values for the regs structure
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mov rsp, rsi
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add rsp, REGSTRUCTSIZE
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; build the structure
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mov r9, ss
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push r9
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push r11 ; saved rsp
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pushfq
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mov r9, cs
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push r9
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push r10 ; rip
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push qword 0 ; err
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push rbp
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push rsi
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push rdi
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push r15
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push r14
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push r13
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push r12
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push r11
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push r10
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push r9
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push r8
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push rdx
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push rcx
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push rbx
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push rax
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mov r9,ds
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push r9
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mov r9,es
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push r9
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push qword 0 ; fs
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push qword 0 ; gs
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mov r10, cr2
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push r10
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; restore old stack pointer
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mov rsp, r11
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extern sched_yieldtrampoline
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call sched_yieldtrampoline
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; the switch call never returns
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