ref: 885e8ea24aa8a5444da0ff268b792f260ab83cff
dir: /src/asm/rpn.c/
/* * This file is part of RGBDS. * * Copyright (c) 1997-2018, Carsten Sorensen and RGBDS contributors. * * SPDX-License-Identifier: MIT */ /* * Controls RPN expressions for objectfiles */ #include <stdint.h> #include <stdio.h> #include <string.h> #include "asm/asm.h" #include "asm/main.h" #include "asm/rpn.h" #include "asm/symbol.h" #include "linkdefs.h" void mergetwoexpressions(struct Expression *expr, const struct Expression *src1, const struct Expression *src2) { *expr = *src1; memcpy(&(expr->tRPN[expr->nRPNLength]), src2->tRPN, src2->nRPNLength); expr->nRPNLength += src2->nRPNLength; expr->isReloc |= src2->isReloc; expr->isPCRel |= src2->isPCRel; } #define joinexpr() mergetwoexpressions(expr, src1, src2) /* * Add a byte to the RPN expression */ void pushbyte(struct Expression *expr, int b) { expr->tRPN[expr->nRPNLength++] = b & 0xFF; } /* * Reset the RPN module */ void rpn_Reset(struct Expression *expr) { expr->nRPNLength = 0; expr->nRPNOut = 0; expr->isReloc = 0; expr->isPCRel = 0; } /* * Returns the next rpn byte in expression */ uint16_t rpn_PopByte(struct Expression *expr) { if (expr->nRPNOut == expr->nRPNLength) return 0xDEAD; return expr->tRPN[expr->nRPNOut++]; } /* * Determine if the current expression is relocatable */ uint32_t rpn_isReloc(const struct Expression *expr) { return expr->isReloc; } /* * Determine if the current expression can be pc-relative */ uint32_t rpn_isPCRelative(const struct Expression *expr) { return expr->isPCRel; } /* * Add symbols, constants and operators to expression */ void rpn_Number(struct Expression *expr, uint32_t i) { rpn_Reset(expr); pushbyte(expr, RPN_CONST); pushbyte(expr, i); pushbyte(expr, i >> 8); pushbyte(expr, i >> 16); pushbyte(expr, i >> 24); expr->nVal = i; } void rpn_Symbol(struct Expression *expr, char *tzSym) { if (!sym_isConstant(tzSym)) { const struct sSymbol *psym; rpn_Reset(expr); psym = sym_FindSymbol(tzSym); if (psym == NULL || psym->pSection == pCurrentSection || psym->pSection == NULL) expr->isPCRel = 1; expr->isReloc = 1; pushbyte(expr, RPN_SYM); while (*tzSym) pushbyte(expr, *tzSym++); pushbyte(expr, 0); } else { rpn_Number(expr, sym_GetConstantValue(tzSym)); } } void rpn_BankSelf(struct Expression *expr) { rpn_Reset(expr); /* * This symbol is not really relocatable, but this makes the assembler * write this expression as a RPN patch to the object file. */ expr->isReloc = 1; pushbyte(expr, RPN_BANK_SELF); } void rpn_BankSymbol(struct Expression *expr, char *tzSym) { /* The @ symbol is treated differently. */ if (sym_FindSymbol(tzSym) == pPCSymbol) { rpn_BankSelf(expr); return; } if (!sym_isConstant(tzSym)) { rpn_Reset(expr); /* * Check that the symbol exists by evaluating and discarding the * value. */ sym_GetValue(tzSym); expr->isReloc = 1; pushbyte(expr, RPN_BANK_SYM); while (*tzSym) pushbyte(expr, *tzSym++); pushbyte(expr, 0); } else { yyerror("BANK argument must be a relocatable identifier"); } } void rpn_BankSection(struct Expression *expr, char *tzSectionName) { rpn_Reset(expr); /* * This symbol is not really relocatable, but this makes the assembler * write this expression as a RPN patch to the object file. */ expr->isReloc = 1; pushbyte(expr, RPN_BANK_SECT); while (*tzSectionName) pushbyte(expr, *tzSectionName++); pushbyte(expr, 0); } void rpn_CheckHRAM(struct Expression *expr, const struct Expression *src) { *expr = *src; pushbyte(expr, RPN_HRAM); } void rpn_LOGNOT(struct Expression *expr, const struct Expression *src) { *expr = *src; pushbyte(expr, RPN_LOGUNNOT); } void rpn_LOGOR(struct Expression *expr, const struct Expression *src1, const struct Expression *src2) { joinexpr(); expr->nVal = (expr->nVal || src2->nVal); pushbyte(expr, RPN_LOGOR); } void rpn_LOGAND(struct Expression *expr, const struct Expression *src1, const struct Expression *src2) { joinexpr(); expr->nVal = (expr->nVal && src2->nVal); pushbyte(expr, RPN_LOGAND); } void rpn_HIGH(struct Expression *expr, const struct Expression *src) { *expr = *src; expr->nVal = (expr->nVal >> 8) & 0xFF; pushbyte(expr, RPN_CONST); pushbyte(expr, 8); pushbyte(expr, 0); pushbyte(expr, 0); pushbyte(expr, 0); pushbyte(expr, RPN_SHR); pushbyte(expr, RPN_CONST); pushbyte(expr, 0xFF); pushbyte(expr, 0); pushbyte(expr, 0); pushbyte(expr, 0); pushbyte(expr, RPN_AND); } void rpn_LOW(struct Expression *expr, const struct Expression *src) { *expr = *src; expr->nVal = expr->nVal & 0xFF; pushbyte(expr, RPN_CONST); pushbyte(expr, 0xFF); pushbyte(expr, 0); pushbyte(expr, 0); pushbyte(expr, 0); pushbyte(expr, RPN_AND); } void rpn_LOGEQU(struct Expression *expr, const struct Expression *src1, const struct Expression *src2) { joinexpr(); expr->nVal = (expr->nVal == src2->nVal); pushbyte(expr, RPN_LOGEQ); } void rpn_LOGGT(struct Expression *expr, const struct Expression *src1, const struct Expression *src2) { joinexpr(); expr->nVal = (expr->nVal > src2->nVal); pushbyte(expr, RPN_LOGGT); } void rpn_LOGLT(struct Expression *expr, const struct Expression *src1, const struct Expression *src2) { joinexpr(); expr->nVal = (expr->nVal < src2->nVal); pushbyte(expr, RPN_LOGLT); } void rpn_LOGGE(struct Expression *expr, const struct Expression *src1, const struct Expression *src2) { joinexpr(); expr->nVal = (expr->nVal >= src2->nVal); pushbyte(expr, RPN_LOGGE); } void rpn_LOGLE(struct Expression *expr, const struct Expression *src1, const struct Expression *src2) { joinexpr(); expr->nVal = (expr->nVal <= src2->nVal); pushbyte(expr, RPN_LOGLE); } void rpn_LOGNE(struct Expression *expr, const struct Expression *src1, const struct Expression *src2) { joinexpr(); expr->nVal = (expr->nVal != src2->nVal); pushbyte(expr, RPN_LOGNE); } void rpn_ADD(struct Expression *expr, const struct Expression *src1, const struct Expression *src2) { joinexpr(); expr->nVal = (expr->nVal + src2->nVal); pushbyte(expr, RPN_ADD); } void rpn_SUB(struct Expression *expr, const struct Expression *src1, const struct Expression *src2) { joinexpr(); expr->nVal = (expr->nVal - src2->nVal); pushbyte(expr, RPN_SUB); } void rpn_XOR(struct Expression *expr, const struct Expression *src1, const struct Expression *src2) { joinexpr(); expr->nVal = (expr->nVal ^ src2->nVal); pushbyte(expr, RPN_XOR); } void rpn_OR(struct Expression *expr, const struct Expression *src1, const struct Expression *src2) { joinexpr(); expr->nVal = (expr->nVal | src2->nVal); pushbyte(expr, RPN_OR); } void rpn_AND(struct Expression *expr, const struct Expression *src1, const struct Expression *src2) { joinexpr(); expr->nVal = (expr->nVal & src2->nVal); pushbyte(expr, RPN_AND); } void rpn_SHL(struct Expression *expr, const struct Expression *src1, const struct Expression *src2) { joinexpr(); expr->nVal = (expr->nVal << src2->nVal); pushbyte(expr, RPN_SHL); } void rpn_SHR(struct Expression *expr, const struct Expression *src1, const struct Expression *src2) { joinexpr(); expr->nVal = (expr->nVal >> src2->nVal); pushbyte(expr, RPN_SHR); } void rpn_MUL(struct Expression *expr, const struct Expression *src1, const struct Expression *src2) { joinexpr(); expr->nVal = (expr->nVal * src2->nVal); pushbyte(expr, RPN_MUL); } void rpn_DIV(struct Expression *expr, const struct Expression *src1, const struct Expression *src2) { joinexpr(); if (src2->nVal == 0) fatalerror("division by zero"); expr->nVal = (expr->nVal / src2->nVal); pushbyte(expr, RPN_DIV); } void rpn_MOD(struct Expression *expr, const struct Expression *src1, const struct Expression *src2) { joinexpr(); if (src2->nVal == 0) fatalerror("division by zero"); expr->nVal = (expr->nVal % src2->nVal); pushbyte(expr, RPN_MOD); } void rpn_UNNEG(struct Expression *expr, const struct Expression *src) { *expr = *src; expr->nVal = -expr->nVal; pushbyte(expr, RPN_UNSUB); } void rpn_UNNOT(struct Expression *expr, const struct Expression *src) { *expr = *src; expr->nVal = ~expr->nVal; pushbyte(expr, RPN_UNNOT); }