mirror of
https://github.com/open-goal/jak-project
synced 2026-05-27 16:14:18 -04:00
Tyler Wilding
112 lines
2.6 KiB
NASM
112 lines
2.6 KiB
NASM
;;;;;;;;;;;;;;;;;;;;
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;; asm_funcs.nasm ;;
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;;;;;;;;;;;;;;;;;;;;
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;; GOAL Runtime assembly functions. These exist only in the x86 version of GOAL.
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;; declaration of the extern "C" function format_impl
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extern format_impl
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SECTION .TEXT
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;; This _format function which will be exported to the GOAL symbol table at runtime start as "_format"
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;; This function accepts 8 GOAL arguments and puts them on the stack, then calls format_impl and passes
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;; a pointer to this array of GOAL arguments as the argument. The reason for this is that GOAL and
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;; the standard System V ABI used in Linux are different for 8 argument function calls.
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global _format
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_format:
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; GOAL will call with regs RDI, RSI, RDX, RCX, R8, R9, R10, R11
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; to make sure the stack frame is aligned
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sub rsp, 8
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; push all registers and create the register array on the stack
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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 rcx
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push rdx
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push rsi
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push rdi
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; set the first argument register to the stack argument array
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mov rcx, rsp
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sub rsp, 32
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; call C function to do format, result will go in RAX
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call format_impl
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add rsp, 32
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; restore
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; (note - this could probably just be add rsp 72, we don't care about the value of these register)
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pop rdi
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pop rsi
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pop rdx
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pop rcx
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pop r8
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pop r9
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pop r10
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pop r11
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add rsp, 8
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ret
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;; NOTE: calling format has a _lot_ of indirection...
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;; symbol table lookup to find the GOAL "format" symbol value
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;; run the GOAL-to-C trampoline (on GOAL heap) to jump to this _format
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;; run this wrapper to call the real format_impl
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;; The _call_goal_asm function is used to call a GOAL function from C.
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;; It supports up to 3 arguments and a return value.
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;; This should be called with the arguments:
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;; - first goal arg
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;; - second goal arg
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;; - third goal arg
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;; - address of function to call
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;; - address of the symbol table
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;; - GOAL memory space offset
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global _call_goal_asm
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_call_goal_asm:
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push rdx ; 8
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push rbx ; 16
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push rbp ; 24
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push rsi ; 32
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push rdi ; 40
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push r8 ; 48
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push r9 ; 56
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push r10 ; 64
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push r11 ; 72
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push r12 ; 80
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push r13 ; 88
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push r14 ; 96
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push r15 ; 104
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mov rdi, rcx ;; rdi is GOAL first argument, rcx is windows first argument
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mov rsi, rdx ;; rsi is GOAL second argument, rdx is windows second argument
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mov rdx, r8 ;; rdx is GOAL third argument, r8 is windows third argument
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mov r13, r9 ;; r13 is GOAL fp, r9 is windows fourth argument
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mov r15, [rsp + 144] ;; symbol table
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mov r14, [rsp + 152] ;; offset
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call r13
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pop r15
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pop r14
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pop r13
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pop r12
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pop r11
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pop r10
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pop r9
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pop r8
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pop rdi
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pop rsi
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pop rbp
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pop rbx
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pop rdx
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ret |