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//:: call
:(before "End Initialize Op Names")
put_new(Name, "e8", "call disp32 (call)");
:(scenario call_disp32)
% Reg[ESP].u = 0x64;
== 0x1
# op ModR/M SIB displacement immediate
e8 a0 00 00 00 # call function offset at 0x000000a0
# next EIP is 6
+run: call imm32 0x000000a0
+run: decrementing ESP to 0x00000060
+run: pushing value 0x00000006
+run: jumping to 0x000000a6
:(before "End Single-Byte Opcodes")
case 0xe8: { // call disp32 relative to next EIP
const int32_t offset = next32();
trace(90, "run") << "call imm32 0x" << HEXWORD << offset << end();
//? cerr << "push: EIP: " << EIP << " => " << Reg[ESP].u << '\n';
push(EIP);
EIP += offset;
trace(90, "run") << "jumping to 0x" << HEXWORD << EIP << end();
break;
}
//:
:(scenario call_r32)
% Reg[ESP].u = 0x64;
% Reg[EBX].u = 0x000000a0;
== 0x1
# op ModR/M SIB displacement immediate
ff d3 # call function offset at EBX
# next EIP is 3
+run: call to r/m32
+run: r/m32 is EBX
+run: decrementing ESP to 0x00000060
+run: pushing value 0x00000003
+run: jumping to 0x000000a3
:(before "End Op ff Subops")
case 2: { // call function pointer at r/m32
trace(90, "run") << "call to r/m32" << end();
const int32_t* offset = effective_address(modrm);
push(EIP);
EIP += *offset;
trace(90, "run") << "jumping to 0x" << HEXWORD << EIP << end();
break;
}
:(scenario call_mem_at_r32)
% Reg[ESP].u = 0x64;
% Reg[EBX].u = 0x2000;
== 0x1 # code segment
# op ModR/M SIB displacement immediate
ff 13 # call function offset at *EBX
# next EIP is 3
== 0x2000 # data segment
a0 00 00 00 # 0xa0
+run: call to r/m32
+run: effective address is 0x2000 (EBX)
+run: decrementing ESP to 0x00000060
+run: pushing value 0x00000003
+run: jumping to 0x000000a3
//:: ret
:(before "End Initialize Op Names")
put_new(Name, "c3", "return from most recent unfinished call (ret)");
:(scenario ret)
% Reg[ESP].u = 0x2000;
== 0x1 # code segment
# op ModR/M SIB displacement immediate
c3
== 0x2000 # data segment
10 00 00 00 # 0x10
+run: return
+run: popping value 0x00000010
+run: jumping to 0x00000010
:(before "End Single-Byte Opcodes")
case 0xc3: { // return from a call
trace(90, "run") << "return" << end();
EIP = pop();
trace(90, "run") << "jumping to 0x" << HEXWORD << EIP << end();
break;
}
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