mu - Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.

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	Commit message (Collapse)	Author	Age	Files	Lines
*	6527 - increase stack limits	Kartik Agaram	2020-06-15	1	-0/+3
\| \| \| \| \| \|	We haven't run into this limit yet, but everytime I see a 'stream overflow' error I run into it while going over all the knobs in apps/subx-params.subx, if I increase Input-size (used by survey.subx) too much.
*	core translator phases now emit identical binaries	Kartik Agaram	2020-05-18	1	-1/+1
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*	fix a crash when translating apps/ex1	Kartik Agaram	2020-05-18	1	-1/+1
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*	5851	Kartik Agaram	2020-01-01	1	-0/+53
	Rename a few scripts to be more consistent. I'm also starting to feel the urge to bud off `subx run` into its own program, say tools/emulate_x86. It doesn't really rely on the SubX notation at all. And then I could rename `subx translate` to `translate_subx_bootstrap`. Only problem: the commands in the Readme get verbose. But the Readme is gonna need surgery soon anyway to put translate_mu front and center.

highlight .ges { font-weight: bold; font-style: italic } /* Generic.EmphStrong */ .highlight .gr { color: #aa0000 } /* Generic.Error */ .highlight .gh { color: #333333 } /* Generic.Heading */ .highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */ .highlight .go { color: #888888 } /* Generic.Output */ .highlight .gp { color: #555555 } /* Generic.Prompt */ .highlight .gs { font-weight: bold } /* Generic.Strong */ .highlight .gu { color: #666666 } /* Generic.Subheading */ .highlight .gt { color: #aa0000 } /* Generic.Traceback */ .highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */ .highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */ .highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */ .highlight .kp { color: #008800 } /* Keyword.Pseudo */ .highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */ .highlight .kt { color: #888888; font-weig

//:: call

:(before "End Initialize Op Names")
put_new(Name, "e8", "call disp32 (call)");

:(code)
void test_call_disp32() {
  Mem.push_back(vma(0xbd000000));  // manually allocate memory
  Reg[ESP].u = 0xbd000064;
  run(
      "== code 0x1\n"
      // op     ModR/M  SIB   displacement  immediate
      "  e8                                 a0 00 00 00 \n"  // call function offset at 0xa0
      // next EIP is 6
  );
  CHECK_TRACE_CONTENTS(
      "run: call imm32 0x000000a0\n"
      "run: decrementing ESP to 0xbd000060\n"
      "run: pushing value 0x00000006\n"
      "run: jumping to 0x000000a6\n"
  );
}

:(before "End Single-Byte Opcodes")
case 0xe8: {  // call disp32 relative to next EIP
  const int32_t offset = next32();
  ++Callstack_depth;
  trace(Callstack_depth+1, "run") << "call imm32 0x" << HEXWORD << offset << end();
//?   cerr << "push: EIP: " << EIP << " => " << Reg[ESP].u << '\n';
  push(EIP);
  EIP += offset;
  trace(Callstack_depth+1, "run") << "jumping to 0x" << HEXWORD << EIP << end();
  break;
}

//:

:(code)
void test_call_r32() {
  Mem.push_back(vma(0xbd000000));  // manually allocate memory
  Reg[ESP].u = 0xbd000064;
  Reg[EBX].u = 0x000000a0;
  run(
      "== code 0x1\n"
      // op     ModR/M  SIB   displacement  immediate
      "  ff     d3                                      \n"  // call function offset at EBX
      // next EIP is 3
  );
  CHECK_TRACE_CONTENTS(
      "run: call to r/m32\n"
      "run: r/m32 is EBX\n"
      "run: decrementing ESP to 0xbd000060\n"
      "run: pushing value 0x00000003\n"
      "run: jumping to 0x000000a0\n"
  );
}

:(before "End Op ff Subops")
case 2: {  // call function pointer at r/m32
  trace(Callstack_depth+1, "run") << "call to r/m32" << end();
  const int32_t* offset = effective_address(modrm);
  push(EIP);
  EIP = *offset;
  trace(Callstack_depth+1, "run") << "jumping to 0x" << HEXWORD << EIP << end();
  ++Callstack_depth;
  break;
}

:(code)
void test_call_mem_at_rm32() {
  Mem.push_back(vma(0xbd000000));  // manually allocate memory
  Reg[ESP].u = 0xbd000064;
  Reg[EBX].u = 0x2000;
  run(
      "== code 0x1\n"
      // op     ModR/M  SIB   displacement  immediate
      "  ff     13                                      \n"  // call function offset at *EBX
      // next EIP is 3
      "== data 0x2000\n"
      "a0 00 00 00\n"  // 0xa0
  );
  CHECK_TRACE_CONTENTS(
      "run: call to r/m32\n"
      "run: effective address is 0x00002000 (EBX)\n"
      "run: decrementing ESP to 0xbd000060\n"
      "run: pushing value 0x00000003\n"
      "run: jumping to 0x000000a0\n"
  );
}

//:: ret

:(before "End Initialize Op Names")
put_new(Name, "c3", "return from most recent unfinished call (ret)");

:(code)
void test_ret() {
  Mem.push_back(vma(0xbd000000));  // manually allocate memory
  Reg[ESP].u = 0xbd000064;
  write_mem_u32(Reg[ESP].u, 0x10);
  run(
      "== code 0x1\n"
      // op     ModR/M  SIB   displacement  immediate
      "  c3                                           \n"  // return
      "== data 0x2000\n"
      "10 00 00 00\n"  // 0x10
  );
  CHECK_TRACE_CONTENTS(
      "run: return\n"
      "run: popping value 0x00000010\n"
      "run: jumping to 0x00000010\n"
  );
}

:(before "End Single-Byte Opcodes")
case 0xc3: {  // return from a call
  trace(Callstack_depth+1, "run") << "return" << end();
  --Callstack_depth;
  EIP = pop();
  trace(Callstack_depth+1, "run") << "jumping to 0x" << HEXWORD << EIP << end();
  break;
}