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https://github.com/open-goal/jak-project
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water
111 lines
2.4 KiB
C++
111 lines
2.4 KiB
C++
/*!
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* @file x86.h
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* x86-64 register definitions and calling convention
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*/
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#ifndef JAK_X86_H
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#define JAK_X86_H
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// nicknames for gprs and xmm's
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enum X86_Registers {
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RAX, // return, temp
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RCX, // arg 3
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RDX, // arg 2
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RBX, // X saved
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RSP, // stack pointer
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RBP, // X base pointer (like fp)
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RSI, // arg 1
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RDI, // arg 0
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R8, // arg 4
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R9, // arg 5
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R10, // arg 6 - GOAL only
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R11, // arg 7 - GOAL only
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R12, // X saved
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R13, // X saved - function call register (like t9)
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R14, // X saved - offset
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R15, // X saved - st
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XMM0,
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XMM1,
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XMM2,
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XMM3,
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XMM4,
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XMM5,
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XMM6,
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XMM7,
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XMM8,
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XMM9,
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XMM10,
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XMM11,
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XMM12,
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XMM13,
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XMM14,
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XMM15
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};
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// the argument registers of GOAL.
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// the first 6 are shared with Linux.
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constexpr uint8_t ARG_REGS[8] = {
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RDI, RSI, RDX, RCX, R8, R9, R10, R11,
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};
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constexpr int SAVED_REG_COUNT = 2;
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constexpr uint8_t SAVED_REGS[SAVED_REG_COUNT] = {
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RBX,
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// R12,
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R13 // we don't really have to do this...
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};
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// todo - move to an xmm?
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constexpr uint8_t PP_REG = R12;
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// register used to hold the address of the function we're calling
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// this is a GOAL only thing
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constexpr uint8_t T9_REG = R13;
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// register used to hold the address of the current function
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constexpr uint8_t BP_REG = RBP;
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// register used to return data (GOAL and Linux)
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constexpr uint8_t RET_REG = RAX;
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// reserved register which holds the offset from GOAL pointers to real memory addresses
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constexpr uint8_t OFF_REG = R14;
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// reserved register which holds the pointer to the symbol table
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// todo should this hold a GOAL pointer or real pointer? currently a real pointer
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constexpr uint8_t ST_REG = R15;
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constexpr int PTR_SIZE = 4;
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constexpr int GPR_SIZE = 8;
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static const char* x86_gpr_names[] = {
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"rax", "rcx", "rdx", "rbx", "rsp", "rbp", "rsi", "rdi", "r8", "r9", "r10",
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"r11", "r12", "r13", "r14", "r15", "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5",
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"xmm6", "xmm7", "xmm8", "xmm9", "xmm10", "xmm11", "xmm12", "xmm13", "xmm14", "xmm15"};
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/*
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Name Arg ID Clobber? Special
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RAX - y return
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RCX 3 y arg
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RDX 2 y arg
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RBX - n
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RSP - n stack pointer
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RBP - n base pointer
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RSI 1 y arg
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RDI 0 y arg
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R8 4 y arg
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R9 5 y arg
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R10
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R11
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R12
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R13
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R14
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R15
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*/
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#endif // JAK_X86_H
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