Mercurial > repos > blastem
view gdb_remote.c @ 505:b7b7a1cab44a
The local clone on my laptop got messed up and some changes had not been pushed. This commit represents the status of the working copy from that clone. It unfortunately contains some changes that I did not intend to commit yet, but this seems like the best option at the moment.
author | Michael Pavone <pavone@retrodev.com> |
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date | Mon, 06 Jan 2014 22:54:05 -0800 |
parents | 140af5509ce7 |
children | 1495179d6737 |
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/* Copyright 2013 Michael Pavone This file is part of BlastEm. BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text. */ #include "blastem.h" #include <unistd.h> #include <fcntl.h> #include <stddef.h> #include <stdlib.h> #include <stdio.h> #define INITIAL_BUFFER_SIZE 4096 char * buf = NULL; char * curbuf = NULL; char * end = NULL; size_t bufsize; int cont = 0; int expect_break_response=0; uint32_t resume_pc; void gdb_debug_enter(genesis_context * gen, uint32_t pc) { fcntl(STDIN_FILENO, FD_SETFL, 0); resume_pc = pc; cont = 0; uint8_t partial = 0; while(!cont) { if (!curbuf) { int numread = read(STDIN_FILENO, buf, bufsize); curbuf = buf; end = buf + numread; } else if (partial) { if (curbuf != buf) { memmove(curbuf, buf, end-curbuf); end -= cufbuf - buf; } int numread = read(STDIN_FILENO, end, bufsize - (end-buf)); end += numread; curbuf = buf; } for (; curbuf < end; curbuf++) { if (*curbuf == '$') { curbuf++; char * start = curbuf; while (curbuf < end && *curbuf != '#') { curbuf++; } if (*curbuf == '#') { //check to make sure we've received the checksum bytes if (end-curbuf >= 2) { //TODO: verify checksum //Null terminate payload *curbuf = 0 //send acknowledgement write(FILENO_STDOUT, "+", 1); gdb_run_command(genesis_context * gen, start); curbuf += 2; } } else { curbuf--; partial = 1; break; } } } } fcntl(STDIN_FILENO, FD_SETFL, O_NONBLOCK); } void gdb_run_command(genesis_context * gen, char * command) { switch(*command) { case 'c': if (*(command+1) != 0) { resume_pc = } cont = 1; expect_break_response = 1; break; case 's': } } void gdb_run_commands(genesis_context * gen) { int enter_debugger = 0; char * cur = buf; while(cur < curbuf); { if(*cur == '$') { cur++ char * start = cur; while (cur < curbuf && *cur != '#') { cur++; } if (*cur == '#') { //check to make sure we've received the checksum bytes if (curbuf-cur >= 2) { //TODO: verify checksum //Null terminate payload //send acknowledgement write(FILENO_STDOUT, "+", 1); gdb_run_command(genesis_context * gen, start); cur += 2; } else { cur = start - 1; break; } } else { cur = start - 1; break; } } else { if (*cur == 0x03) { enter_debugger = 1; } cur++; } } //FIXME if (consumed == curbuf-buf) { curbuf = buf; } else if (consumed > 0) { memmove(buf, buf + consumed, curbuf - buf - consumed); curbuf -= consumed; } } int gdb_command_poll(genesis_context * gen) { for(;;) { if (curbuf == buf + bufsize) { //buffer is full, expand it bufsize *= 2; buf = realloc(buf, bufsize); if (!buf) { fprintf(stderr, "Failed to grow GDB command buffer to %d bytes\n", (int)bufsize); exit(1); } curbuf = buf + bufsize/2; } int numread = read(STDIN_FILENO, buf, bufsize); if (numread < 0) { if (errno == EAGAIN || errno == EWOULDBLOCK) { return 0; } else { fprintf(stderr, "Error %d while reading GDB commands from stdin", errno); exit(1); } } else if (numread == 0) { exit(0); } for (curbuf = buf, end = buf+numread; curbuf < end; curbuf++) { if (*curbuf = 0x03) { curbuf++; return 1; } } } return 0; } void gdb_remote_init() { fcntl(STDIN_FILENO, FD_SETFL, O_NONBLOCK); buf = malloc(INITIAL_BUFFER_SIZE); curbuf = buf; bufzie = INITIAL_BUFFER_SIZE; }