Mercurial > repos > blastem
view gdb_remote.c @ 478:2e4a4188cfb0
Fix DMA fill so that it does not cause observable changes to the FIFO. Get DMA copy mostly correct from an observable ffect perspective. DMA copy probably does not reflect internal implementation still given that evidence seems to suggest no FIFO usage at all.
author | Mike Pavone <pavone@retrodev.com> |
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date | Tue, 17 Sep 2013 00:11:45 -0700 |
parents | 140af5509ce7 |
children | b7b7a1cab44a |
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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; 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) { resume_pc = pc; while(!cont) { } cont = 0; } 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; } } void 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 - (curbuf-buf)); if (numread < 0) { if (errno == EAGAIN || errno == EWOULDBLOCK) { return; } else { fprintf(stderr, "Error %d while reading GDB commands from stdin", errno); exit(1); } } else if (numread == 0) { exit(0); } gdb_run_commands(genesis_context * gen); } } void gdb_remote_init() { fcntl(STDIN_FILENO, FD_SETFL, O_NONBLOCK); buf = malloc(INITIAL_BUFFER_SIZE); curbuf = buf; bufzie = INITIAL_BUFFER_SIZE; }