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scheduler: have a separate stack for yield

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Matheus
2023-05-03 19:11:40 -03:00
parent 393e34a04e
commit b5d4fc07e2
4 changed files with 15 additions and 7 deletions
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kernel-src/arch/x86-64/context.asm
+7 -5
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@@ -34,17 +34,19 @@ arch_context_switch:
o64 iret
; saves context on the stack and passes as the argument to a function
; since this uses the C system V abi, some registers can be clobbered (in this case, rsi and r11)
; since this uses the C system V abi, some registers can be clobbered (in this case, r10 and r11)
; rdi has the pointer to the function to call
; rsi has the pointer to the stack the function should have on call
; if the main function returns, just return normally
global arch_context_saveandcall
arch_context_saveandcall:
mov r11, [rsp] ; save return address on scratch register
mov rsi, rsp
add rsi, 8 ; stack pointer before the call instruction
mov r10, rsp
add r10, 8 ; stack pointer before the call instruction
mov rsp, rsi ; use desired stack
push qword 0x10 ; SS
push rsi ; RSP
push r10 ; RSP
pushf ; movs and pushes don't affect flags
push qword 0x08 ; CS
push r11 ; return address
@@ -73,7 +75,7 @@ arch_context_saveandcall:
mov r11, rdi ; save function to call
mov rdi, rsp ; first argument is the context struct
push rsi ; save old stack
push r10 ; save old stack
call r11 ; jump to the desired function
pop rsp ; restore old stack