333 lines
9.2 KiB
Plaintext
333 lines
9.2 KiB
Plaintext
%{
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#include <fxos/load.h>
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#include <fxos/lang.h>
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#include <fxos/disassembly.h>
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#include <fxos/errors.h>
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#include <fxos/util.h>
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#include <cstdarg>
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/* Text value for parser */
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static char *yylval;
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/* Argument tokens */
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enum Token {
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/* Instruction pattern and mnemonic */
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PATTERN = 1, MNEMONIC,
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/* General-purpose registers */
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R0, RN, RM,
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/* Banked registers */
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R0_BANK, R1_BANK, R2_BANK, R3_BANK, R4_BANK, R5_BANK, R6_BANK, R7_BANK,
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/* Control registers */
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SR, PR, GBR, VBR, DBR, SSR, SPC, SGR, MACH, MACL,
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/* PC-relative jumps and displacements (with 4-alignment correction) */
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JUMP8, JUMP12, AT_DPC,
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/* Immediate operands */
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IMM,
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/* Memory access with post-increment and pre-decrement */
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AT_RN, AT_RM, AT_RMP, AT_RNP, AT_MRN,
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/* Structure dereferencing */
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AT_DRN, AT_DRM, AT_DGBR,
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/* Array dereferencing */
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AT_R0RN, AT_R0RM, AT_R0GBR,
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};
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/* Instruction opcode pattern */
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struct Pattern {
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/* 16-bit opcode, bits corresponding to arguments are clear */
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uint16_t bits;
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/* Position of the arguments */
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uint8_t n_sh, m_sh, d_sh, i_sh;
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/* Length of arguments, in bits */
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uint16_t n_size, m_size, d_size, i_size;
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};
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/* Current file name */
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static std::string filename;
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/* Error messages and exceptions */
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static void err(char const *format, ...)
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{
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static char buf[256];
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va_list args;
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va_start(args, format);
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vsnprintf(buf, 256, format, args);
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va_end(args);
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throw FxOS::SyntaxError(filename.c_str(), yylineno, buf);
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}
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%}
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%option prefix="asm"
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%option noyywrap
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%option nounput
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pattern ^[01nmdi]{16}
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mnemonic [a-zA-Z0-9./]+
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space [ \t]+
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%%
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^#[^\n]* ;
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{space} ;
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, ;
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[\n] yylineno++;
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{pattern} { yylval = strdup(yytext); return PATTERN; }
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^.{0,16} { err("invalid opcode at start of line"); }
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"#imm" { return IMM; }
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"rn" { return RN; }
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"rm" { return RM; }
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"jump8" { return JUMP8; }
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"jump12" { return JUMP12; }
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"@(disp,"[ ]*"pc)" { return AT_DPC; }
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"@rn" { return AT_RN; }
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"@rm" { return AT_RM; }
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"@rm+" { return AT_RMP; }
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"@rn+" { return AT_RNP; }
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"@-rn" { return AT_MRN; }
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"@(disp,"[ ]*"rn)" { return AT_DRN; }
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"@(disp,"[ ]*"rm)" { return AT_DRM; }
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"@(r0,"[ ]*"rn)" { return AT_R0RN; }
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"@(r0,"[ ]*"rm)" { return AT_R0RM; }
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"@(disp,"[ ]*"gbr)" { return AT_DGBR; }
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"@(r0,"[ ]*"gbr)" { return AT_R0GBR; }
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"r0" { return R0; }
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"sr" { return SR; }
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"pr" { return PR; }
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"gbr" { return GBR; }
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"vbr" { return VBR; }
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"ssr" { return SSR; }
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"spc" { return SPC; }
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"sgr" { return SGR; }
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"dbr" { return DBR; }
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"r0_bank" { return R0_BANK; }
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"r1_bank" { return R1_BANK; }
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"r2_bank" { return R2_BANK; }
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"r3_bank" { return R3_BANK; }
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"r4_bank" { return R4_BANK; }
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"r5_bank" { return R5_BANK; }
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"r6_bank" { return R6_BANK; }
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"r7_bank" { return R7_BANK; }
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"mach" { return MACH; }
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"macl" { return MACL; }
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{mnemonic} { yylval = strdup(yytext); return MNEMONIC; }
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. { err("lex error near '%s'", yytext); }
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<<EOF>> { return -1; }
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%%
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namespace FxOS {
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/* Build a pattern for an opcode.
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@code 16-byte string using characters from "01mndi"
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Returns a logical pattern representing the opcode and its arguments.
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Each argument has two parameters: shift ("sh") and size ("size"). From an
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instance of the instruction, the value of parameter x can be recovered as:
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x = (opcode >> x_sh) & ((1 << x_size) - 1);
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(Originally, the second parameter was named x_mask and was equal to the rhs
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of the [&] operator. But this decoding method is now unused.) */
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static Pattern make_pattern(char const *code)
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{
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Pattern p {};
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for(int i = 0; i < 16; i++)
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{
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int c = code[i];
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/* Constant bits */
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if(c == '0' || c == '1')
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{
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p.bits = (p.bits << 1) | (c - '0');
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continue;
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}
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/* Argument bits */
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p.bits <<= 1;
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if(c == 'n') p.n_sh = 15 - i, p.n_size++;
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if(c == 'm') p.m_sh = 15 - i, p.m_size++;
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if(c == 'd') p.d_sh = 15 - i, p.d_size++;
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if(c == 'i') p.i_sh = 15 - i, p.i_size++;
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}
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return p;
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}
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/* Instantiate an argument token as an fxos language structure.
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@token Argument token (tokens for other objets will be rejected)
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@opsize Operation size indicated in the mnemonic
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@m @n @d @i Instruction instance
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Returns a semantic FxOS::Argument. */
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static Argument make_arg(int token, int opsize, int m, int n, int d, int i)
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{
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/* TODO: This function is too slow for the ~100k times it is called. */
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/* Registers rn and rm */
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CpuRegister Rn(format("r%d", n & 0xf));
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CpuRegister Rm(format("r%d", m & 0xf));
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/* Sign extensions of d to 8 and 12 bits */
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int32_t d8 = (int8_t)d;
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int32_t d12 = (d & 0x800) ? (int32_t)(d | 0xfffff000) : (d);
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/* Sign extension of i to 8 bits */
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int32_t i8 = (int8_t)i;
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using Reg = CpuRegister;
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switch(token)
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{
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case R0: return Argument_Reg(Reg::R0);
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case RN: return Argument_Reg(Rn);
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case RM: return Argument_Reg(Rm);
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case R0_BANK: return Argument_Reg(Reg::R0B);
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case R1_BANK: return Argument_Reg(Reg::R1B);
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case R2_BANK: return Argument_Reg(Reg::R2B);
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case R3_BANK: return Argument_Reg(Reg::R3B);
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case R4_BANK: return Argument_Reg(Reg::R4B);
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case R5_BANK: return Argument_Reg(Reg::R5B);
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case R6_BANK: return Argument_Reg(Reg::R6B);
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case R7_BANK: return Argument_Reg(Reg::R7B);
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case SR: return Argument_Reg(Reg::SR);
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case PR: return Argument_Reg(Reg::PR);
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case GBR: return Argument_Reg(Reg::GBR);
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case VBR: return Argument_Reg(Reg::VBR);
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case DBR: return Argument_Reg(Reg::DBR);
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case SSR: return Argument_Reg(Reg::SSR);
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case SPC: return Argument_Reg(Reg::SPC);
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case SGR: return Argument_Reg(Reg::SGR);
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case MACH: return Argument_Reg(Reg::MACH);
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case MACL: return Argument_Reg(Reg::MACL);
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case JUMP8: return Argument_PcJump(d8 * 2);
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case JUMP12: return Argument_PcJump(d12 * 2);
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case IMM: return Argument_Imm(i8);
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case AT_RN: return Argument_Deref(Rn);
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case AT_RM: return Argument_Deref(Rm);
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case AT_RMP: return Argument_PostInc(Rm);
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case AT_RNP: return Argument_PostInc(Rn);
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case AT_MRN: return Argument_PreDec(Rn);
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case AT_DRN: return Argument_StructDeref(d, opsize, Rn);
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case AT_DRM: return Argument_StructDeref(d, opsize, Rm);
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case AT_DGBR: return Argument_StructDeref(d, opsize, Reg::GBR);
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case AT_R0RN: return Argument_ArrayDeref(Reg::R0, Rn);
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case AT_R0RM: return Argument_ArrayDeref(Reg::R0, Rm);
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case AT_R0GBR: return Argument_ArrayDeref(Reg::R0, Reg::GBR);
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case AT_DPC:
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if(!opsize) err("@(disp,pc) must have a size (.w, .l)");
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return Argument_PcRel(d, opsize);
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}
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throw std::logic_error("lex asm builds args from bad tokens");
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}
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/* Record all the instances of an instruction in the disassembly table.
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@p Instruction binary pattern
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@mnemonic Mnemonic (especially important for operation size suffixes)
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@argtoken1 Token corresponding to the first argument (0 if no argument)
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@argtoken2 Token corresponding to the second argument (0 if unused)
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Generates all the instances of the instruction, then sends them to the
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disassembler for fast lookup. */
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static void instantiate(struct Pattern p, std::string mnemonic, int argtoken1,
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int argtoken2)
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{
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for(int n = 0; n < (1 << p.n_size); n++)
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for(int m = 0; m < (1 << p.m_size); m++)
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for(int d = 0; d < (1 << p.d_size); d++)
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for(int i = 0; i < (1 << p.i_size); i++)
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{
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uint16_t opcode = p.bits;
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opcode |= (n << p.n_sh);
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opcode |= (m << p.m_sh);
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opcode |= (d << p.d_sh);
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opcode |= (i << p.i_sh);
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Instruction ins(mnemonic);
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ins.opcode = opcode;
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if(argtoken1) ins.args.push_back(
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make_arg(argtoken1, ins.opsize, m, n, d, i));
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if(argtoken2) ins.args.push_back(
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make_arg(argtoken2, ins.opsize, m, n, d, i));
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register_instruction(ins);
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}
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}
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/* Load an assembly instruction table for the disassembler. */
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void load_asm(File &file, size_t start_offset, size_t start_line)
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{
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/* Lex all instructions and fill in the general assembly table */
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YY_BUFFER_STATE buf = yy_scan_bytes(file.data() + start_offset,
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file.size() - start_offset);
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yylineno = start_line;
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filename = file.path();
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/* Insruction information */
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char *code=nullptr, *mnemonic=nullptr;
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int argtoken1=0, argtoken2=0;
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/* Current line */
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int line = -1;
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while(1)
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{
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int t = yylex();
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if(line >= 0 && (yylineno != line || t == PATTERN || t == -1))
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{
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/* Finalize current instruction */
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if(!mnemonic) err("%d: missing mnemonic", line);
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/* TODO: Generate all parameters and fill */
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Pattern p = make_pattern(code);
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instantiate(p, mnemonic, argtoken1, argtoken2);
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if(code) free(code);
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if(mnemonic) free(mnemonic);
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}
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if(t == -1) break;
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if(t == PATTERN)
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{
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code = yylval;
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line = yylineno;
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mnemonic = nullptr;
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argtoken1 = 0;
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argtoken2 = 0;
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}
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else if(t == MNEMONIC && !mnemonic)
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{
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mnemonic = yylval;
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}
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else if(!mnemonic)
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{
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err("%d: missing mnemonic", line);
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}
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else if(!argtoken1)
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{
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argtoken1 = t;
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}
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else if(!argtoken2)
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{
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argtoken2 = t;
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}
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}
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yy_delete_buffer(buf);
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}
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} /* namespace FxOS */
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