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:(before "End Initialize Op Names(name)")
put(name, 0xcd, "software interrupt");
:(before "End Single-Byte Opcodes")
case 0xcd: { // int imm8 (software interrupt)
trace(2, "run") << "syscall" << end();
uint8_t code = next();
if (code != 0x80) {
raise << "Unimplemented interrupt code " << HEXBYTE << code << '\n' << end();
raise << " Only `int 80h` supported for now.\n" << end();
break;
}
process_int80();
break;
}
:(code)
void process_int80() {
switch (Reg[EAX].u) {
case 1:
exit(/*exit code*/Reg[EBX].u);
break;
case 3:
Reg[EAX].i = read(/*file descriptor*/Reg[EBX].u, /*memory buffer*/mem_addr_u8(Reg[ECX].u), /*size*/Reg[EDX].u);
break;
case 4:
Reg[EAX].i = write(/*file descriptor*/Reg[EBX].u, /*memory buffer*/mem_addr_u8(Reg[ECX].u), /*size*/Reg[EDX].u);
break;
default:
raise << HEXWORD << EIP << ": unimplemented syscall " << Reg[EAX].u << '\n' << end();
}
}
:(before "End Includes")
#include <unistd.h>
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