diff options
| -rw-r--r-- | gdb/ChangeLog | 13 | ||||
| -rw-r--r-- | gdb/Makefile.in | 2 | ||||
| -rw-r--r-- | gdb/dcache.c | 67 | ||||
| -rw-r--r-- | gdb/dcache.h | 16 | ||||
| -rw-r--r-- | gdb/remote.c | 304 |
5 files changed, 183 insertions, 219 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index b05f8ad..ed900e8 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,5 +1,18 @@ Tue Aug 31 15:01:27 1993 K. Richard Pixley (rich@sendai.cygnus.com) + Break dcache code out of remote.c. + * dcache.h: white space changes only. + * dcache.c: add user settable variable to set whether data caching + is in use. + * remote.c: include dcache.h. removed data caching code which is + now in dcache.c. Compile in data caching again. (data caching + is currently off by default.) + (remote_read_bytes, remote_write_bytes): change second arg to + unsigned char. + (remote_dcache): new static variable. + * Makefile.in (REMOTE_O): add dcache.o. + * config/m88k/m88k.mt (TDEPFILES): removed dcache.o. + Break dcache code out of remote-bug.c into dcache.[hc]. * Makefile.in (dcache_h): new macro. (HFILES): added $(dcache_h). diff --git a/gdb/Makefile.in b/gdb/Makefile.in index ba227cc..e734640 100644 --- a/gdb/Makefile.in +++ b/gdb/Makefile.in @@ -189,7 +189,7 @@ SER_HARDWIRE=ser-unix.o # The `remote' debugging target is supported for most architectures, # but not all (e.g. 960) -REMOTE_O=remote.o +REMOTE_O = remote.o dcache.o # Host and target-dependent makefile fragments come in here. #### diff --git a/gdb/dcache.c b/gdb/dcache.c index 864b068..1b477b0 100644 --- a/gdb/dcache.c +++ b/gdb/dcache.c @@ -21,10 +21,13 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "defs.h" #include "dcache.h" +#include "gdbcmd.h" extern int insque(); extern int remque(); +int remote_dcache = 0; + /* The data cache records all the data read from the remote machine since the last time it stopped. @@ -41,17 +44,21 @@ dcache_flush (dcache) { register struct dcache_block *db; - while ((db = dcache->dcache_valid.next) != &dcache->dcache_valid) - { - remque (db); - insque (db, &dcache->dcache_free); - } + if (remote_dcache > 0) + while ((db = dcache->dcache_valid.next) != &dcache->dcache_valid) + { + remque (db); + insque (db, &dcache->dcache_free); + } + + return; } /* * If addr is present in the dcache, return the address of the block * containing it. */ +static struct dcache_block * dcache_hit (dcache, addr) DCACHE *dcache; @@ -59,7 +66,8 @@ dcache_hit (dcache, addr) { register struct dcache_block *db; - if (addr & 3) + if (addr & 3 + || remote_dcache == 0) abort (); /* Search all cache blocks for one that is at this address. */ @@ -70,16 +78,19 @@ dcache_hit (dcache, addr) return db; db = db->next; } + return NULL; } /* Return the int data at address ADDR in dcache block DC. */ +static int dcache_value (db, addr) struct dcache_block *db; unsigned int addr; { - if (addr & 3) + if (addr & 3 + || remote_dcache == 0) abort (); return (db->data[XFORM (addr)]); } @@ -91,12 +102,16 @@ dcache_value (db, addr) prevents errors from creeping in if a memory retrieval is interrupted (which used to put garbage blocks in the valid list...). */ +static struct dcache_block * dcache_alloc (dcache) DCACHE *dcache; { register struct dcache_block *db; + if (remote_dcache == 0) + abort(); + if ((db = dcache->dcache_free.next) == &dcache->dcache_free) { /* If we can't get one from the free list, take last valid and put @@ -111,8 +126,8 @@ dcache_alloc (dcache) return (db); } -/* Return the contents of the word at address ADDR in the remote machine, - using the data cache. */ +/* Using the data cache DCACHE return the contents of the word at + address ADDR in the remote machine. */ int dcache_fetch (dcache, addr) DCACHE *dcache; @@ -120,6 +135,14 @@ dcache_fetch (dcache, addr) { register struct dcache_block *db; + if (remote_dcache == 0) + { + int i; + + (*dcache->read_memory) (addr, (unsigned char *) &i, 4); + return(i); + } + db = dcache_hit (dcache, addr); if (db == 0) { @@ -143,6 +166,12 @@ dcache_poke (dcache, addr, data) { register struct dcache_block *db; + if (remote_dcache == 0) + { + (*dcache->write_memory) (addr, (unsigned char *) &data, 4); + return; + } + /* First make sure the word is IN the cache. DB is its cache block. */ db = dcache_hit (dcache, addr); if (db == 0) @@ -152,8 +181,8 @@ dcache_poke (dcache, addr, data) (*dcache->write_memory) (addr & ~LINE_SIZE_MASK, (unsigned char *) db->data, LINE_SIZE); immediate_quit--; db->addr = addr & ~LINE_SIZE_MASK; - remque (db); /* Off the free list */ - insque (db, &dcache->dcache_valid); /* On the valid list */ + remque (db); /* Off the free list */ + insque (db, &dcache->dcache_valid); /* On the valid list */ } /* Modify the word in the cache. */ @@ -188,3 +217,19 @@ dcache_init (reading, writing) return(dcache); } +void +_initialitize_dcache () +{ + add_show_from_set + (add_set_cmd ("remotecache", class_support, var_boolean, + (char *) &remote_dcache, + "\ +Set cache use for remote targets.\n\ +When on, use data caching for remote targets. For many remote targets\n\ +this option can offer better throughput for reading target memory.\n\ +Unfortunately, gdb does not currently know anything about volatile\n\ +registers and thus data caching will produce incorrect results with\n\ +volatile registers are in use. By default, this option is off.", + &setlist), + &showlist); +} diff --git a/gdb/dcache.h b/gdb/dcache.h index 071ac6e..bfc0dd7 100644 --- a/gdb/dcache.h +++ b/gdb/dcache.h @@ -22,6 +22,16 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #ifndef DCACHE_H #define DCACHE_H +/* The data cache leads to incorrect results because it doesn't know about + volatile variables, thus making it impossible to debug functions which + use hardware registers. Therefore it is #if 0'd out. Effect on + performance is some, for backtraces of functions with a few + arguments each. For functions with many arguments, the stack + frames don't fit in the cache blocks, which makes the cache less + helpful. Disabling the cache is a big performance win for fetching + large structures, because the cache code fetched data in 16-byte + chunks. */ + #define LINE_SIZE_POWER (4) /* eg 1<<3 == 8 */ #define LINE_SIZE (1 << LINE_SIZE_POWER) @@ -57,8 +67,14 @@ typedef struct { } DCACHE; +/* Using the data cache DCACHE return the contents of the word at + address ADDR in the remote machine. */ int dcache_fetch PARAMS((DCACHE *dcache, CORE_ADDR addr)); + +/* Flush DCACHE. */ void dcache_flush PARAMS((DCACHE *dcache)); + +/* Initialize DCACHE. */ DCACHE *dcache_init PARAMS((memxferfunc reading, memxferfunc writing)); /* Write the word at ADDR both in the data cache and in the remote machine. */ diff --git a/gdb/remote.c b/gdb/remote.c index 806c60b..43d0f33 100644 --- a/gdb/remote.c +++ b/gdb/remote.c @@ -56,6 +56,8 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ read mem mAA..AA,LLLL AA..AA is address, LLLL is length. reply XX..XX XX..XX is mem contents + Can be fewer bytes than requested + if able to read only part of the data. or ENN NN is errno write mem MAA..AA,LLLL:XX..XX @@ -63,7 +65,9 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ LLLL is number of bytes, XX..XX is data reply OK for success - ENN for an error + ENN for an error (this includes the case + where only part of the data was + written). cont cAA..AA AA..AA is address to resume If AA..AA is omitted, @@ -87,7 +91,16 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ n... = register number r... = register contents - kill req k + kill request k + + toggle debug d toggle debug flag (see 386 & 68k stubs) + reset r reset -- see sparc stub. + reserved <other> On other requests, the stub should + ignore the request and send an empty + response ($#<checksum>). This way + we can extend the protocol and GDB + can tell whether the stub it is + talking to uses the old or the new. */ #include "defs.h" @@ -102,6 +115,8 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "terminal.h" #include "gdbcmd.h" +#include "dcache.h" + #if !defined(DONT_USE_REMOTE) #ifdef USG #include <sys/types.h> @@ -112,11 +127,11 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* Prototypes for local functions */ -static void -remote_write_bytes PARAMS ((CORE_ADDR memaddr, char *myaddr, int len)); +static int +remote_write_bytes PARAMS ((CORE_ADDR memaddr, unsigned char *myaddr, int len)); -static void -remote_read_bytes PARAMS ((CORE_ADDR memaddr, char *myaddr, int len)); +static int +remote_read_bytes PARAMS ((CORE_ADDR memaddr, unsigned char *myaddr, int len)); static void remote_files_info PARAMS ((struct target_ops *ignore)); @@ -132,7 +147,7 @@ static void remote_fetch_registers PARAMS ((int regno)); static void -remote_resume PARAMS ((int step, int siggnal)); +remote_resume PARAMS ((int pid, int step, int siggnal)); static int remote_start_remote PARAMS ((char *dummy)); @@ -178,7 +193,6 @@ remote_interrupt_twice PARAMS ((int signo)); extern struct target_ops remote_ops; /* Forward decl */ -static int kiodebug = 0; /* This was 5 seconds, which is a long time to sit and wait. Unless this is going though some terminal server or multiplexer or other form of hairy serial connection, I would think 2 seconds would @@ -237,6 +251,8 @@ remote_start_remote (dummy) /* Open a connection to a remote debugger. NAME is the filename used for communication. */ +static DCACHE *remote_dcache; + static void remote_open (name, from_tty) char *name; @@ -251,9 +267,7 @@ device is attached to the remote system (e.g. /dev/ttya)."); unpush_target (&remote_ops); -#if 0 - dcache_init (); -#endif + remote_dcache = dcache_init (remote_read_bytes, remote_write_bytes); remote_desc = SERIAL_OPEN (name); if (!remote_desc) @@ -339,8 +353,8 @@ tohex (nib) /* Tell the remote machine to resume. */ static void -remote_resume (step, siggnal) - int step, siggnal; +remote_resume (pid, step, siggnal) + int pid, step, siggnal; { char buf[PBUFSIZ]; @@ -358,9 +372,7 @@ remote_resume (step, siggnal) target_terminal_inferior (); } -#if 0 - dcache_flush (); -#endif + dcache_flush (remote_dcache); strcpy (buf, step ? "s": "c"); @@ -377,7 +389,7 @@ remote_interrupt (signo) /* If this doesn't work, try more severe steps. */ signal (signo, remote_interrupt_twice); - if (kiodebug) + if (remote_debug) printf ("remote_interrupt called\n"); SERIAL_WRITE (remote_desc, "\003", 1); /* Send a ^C */ @@ -551,7 +563,6 @@ remote_store_registers (regno) remote_send (buf); } -#if 0 /* Read a word from remote address ADDR and return it. This goes through the data cache. */ @@ -559,6 +570,7 @@ int remote_fetch_word (addr) CORE_ADDR addr; { +#if 0 if (icache) { extern CORE_ADDR text_start, text_end; @@ -570,7 +582,8 @@ remote_fetch_word (addr) return buffer; } } - return dcache_fetch (addr); +#endif + return dcache_fetch (remote_dcache, addr); } /* Write a word WORD into remote address ADDR. @@ -581,20 +594,22 @@ remote_store_word (addr, word) CORE_ADDR addr; int word; { - dcache_poke (addr, word); + dcache_poke (remote_dcache, addr, word); } -#endif /* 0 */ + /* Write memory data directly to the remote machine. This does not inform the data cache; the data cache uses this. MEMADDR is the address in the remote memory space. MYADDR is the address of the buffer in our space. - LEN is the number of bytes. */ + LEN is the number of bytes. -static void + Returns number of bytes transferred, or 0 for error. */ + +static int remote_write_bytes (memaddr, myaddr, len) CORE_ADDR memaddr; - char *myaddr; + unsigned char *myaddr; int len; { char buf[PBUFSIZ]; @@ -617,19 +632,33 @@ remote_write_bytes (memaddr, myaddr, len) } *p = '\0'; - remote_send (buf); + putpkt (buf); + getpkt (buf, 0); + + if (buf[0] == 'E') + { + /* There is no correspondance between what the remote protocol uses + for errors and errno codes. We would like a cleaner way of + representing errors (big enough to include errno codes, bfd_error + codes, and others). But for now just return EIO. */ + errno = EIO; + return 0; + } + return len; } /* Read memory data directly from the remote machine. This does not use the data cache; the data cache uses this. MEMADDR is the address in the remote memory space. MYADDR is the address of the buffer in our space. - LEN is the number of bytes. */ + LEN is the number of bytes. -static void + Returns number of bytes transferred, or 0 for error. */ + +static int remote_read_bytes (memaddr, myaddr, len) CORE_ADDR memaddr; - char *myaddr; + unsigned char *myaddr; int len; { char buf[PBUFSIZ]; @@ -640,7 +669,18 @@ remote_read_bytes (memaddr, myaddr, len) abort (); sprintf (buf, "m%x,%x", memaddr, len); - remote_send (buf); + putpkt (buf); + getpkt (buf, 0); + + if (buf[0] == 'E') + { + /* There is no correspondance between what the remote protocol uses + for errors and errno codes. We would like a cleaner way of + representing errors (big enough to include errno codes, bfd_error + codes, and others). But for now just return EIO. */ + errno = EIO; + return 0; + } /* Reply describes memory byte by byte, each byte encoded as two hex characters. */ @@ -649,10 +689,13 @@ remote_read_bytes (memaddr, myaddr, len) for (i = 0; i < len; i++) { if (p[0] == 0 || p[1] == 0) - error ("Remote reply is too short: %s", buf); + /* Reply is short. This means that we were able to read only part + of what we wanted to. */ + break; myaddr[i] = fromhex (p[0]) * 16 + fromhex (p[1]); p += 2; } + return i; } /* Read or write LEN bytes from inferior memory at MEMADDR, transferring @@ -668,8 +711,10 @@ remote_xfer_memory(memaddr, myaddr, len, should_write, target) int should_write; struct target_ops *target; /* ignored */ { - int origlen = len; int xfersize; + int bytes_xferred; + int total_xferred = 0; + while (len > 0) { if (len > MAXBUFBYTES) @@ -678,14 +723,20 @@ remote_xfer_memory(memaddr, myaddr, len, should_write, target) xfersize = len; if (should_write) - remote_write_bytes(memaddr, myaddr, xfersize); + bytes_xferred = remote_write_bytes (memaddr, myaddr, xfersize); else - remote_read_bytes (memaddr, myaddr, xfersize); - memaddr += xfersize; - myaddr += xfersize; - len -= xfersize; + bytes_xferred = remote_read_bytes (memaddr, myaddr, xfersize); + + /* If we get an error, we are done xferring. */ + if (bytes_xferred == 0) + break; + + memaddr += bytes_xferred; + myaddr += bytes_xferred; + len -= bytes_xferred; + total_xferred += bytes_xferred; } - return origlen; /* no error possible */ + return total_xferred; } static void @@ -765,7 +816,7 @@ putpkt (buf) while (1) { - if (kiodebug) + if (remote_debug) { *p = '\0'; printf ("Sending packet: %s...", buf2); fflush(stdout); @@ -781,7 +832,7 @@ putpkt (buf) switch (ch) { case '+': - if (kiodebug) + if (remote_debug) printf("Ack\n"); return; case SERIAL_TIMEOUT: @@ -791,7 +842,7 @@ putpkt (buf) case SERIAL_EOF: error ("putpkt: EOF while trying to read ACK"); default: - if (kiodebug) + if (remote_debug) printf ("%02X %c ", ch&0xFF, ch); continue; } @@ -832,7 +883,7 @@ getpkt (buf, forever) if (forever) continue; if (++retries >= MAX_RETRIES) - if (kiodebug) puts_filtered ("Timed out.\n"); + if (remote_debug) puts_filtered ("Timed out.\n"); goto out; } @@ -850,13 +901,13 @@ getpkt (buf, forever) c = readchar (); if (c == SERIAL_TIMEOUT) { - if (kiodebug) + if (remote_debug) puts_filtered ("Timeout in mid-packet, retrying\n"); goto whole; /* Start a new packet, count retries */ } if (c == '$') { - if (kiodebug) + if (remote_debug) puts_filtered ("Saw new packet start in middle of old one\n"); goto whole; /* Start a new packet, count retries */ } @@ -901,163 +952,10 @@ out: SERIAL_WRITE (remote_desc, "+", 1); - if (kiodebug) + if (remote_debug) fprintf (stderr,"Packet received: %s\n", buf); } -/* The data cache leads to incorrect results because it doesn't know about - volatile variables, thus making it impossible to debug functions which - use hardware registers. Therefore it is #if 0'd out. Effect on - performance is some, for backtraces of functions with a few - arguments each. For functions with many arguments, the stack - frames don't fit in the cache blocks, which makes the cache less - helpful. Disabling the cache is a big performance win for fetching - large structures, because the cache code fetched data in 16-byte - chunks. */ -#if 0 -/* The data cache records all the data read from the remote machine - since the last time it stopped. - - Each cache block holds 16 bytes of data - starting at a multiple-of-16 address. */ - -#define DCACHE_SIZE 64 /* Number of cache blocks */ - -struct dcache_block { - struct dcache_block *next, *last; - unsigned int addr; /* Address for which data is recorded. */ - int data[4]; -}; - -struct dcache_block dcache_free, dcache_valid; - -/* Free all the data cache blocks, thus discarding all cached data. */ - -static void -dcache_flush () -{ - register struct dcache_block *db; - - while ((db = dcache_valid.next) != &dcache_valid) - { - remque (db); - insque (db, &dcache_free); - } -} - -/* - * If addr is present in the dcache, return the address of the block - * containing it. - */ - -struct dcache_block * -dcache_hit (addr) -{ - register struct dcache_block *db; - - if (addr & 3) - abort (); - - /* Search all cache blocks for one that is at this address. */ - db = dcache_valid.next; - while (db != &dcache_valid) - { - if ((addr & 0xfffffff0) == db->addr) - return db; - db = db->next; - } - return NULL; -} - -/* Return the int data at address ADDR in dcache block DC. */ - -int -dcache_value (db, addr) - struct dcache_block *db; - unsigned int addr; -{ - if (addr & 3) - abort (); - return (db->data[(addr>>2)&3]); -} - -/* Get a free cache block, put it on the valid list, - and return its address. The caller should store into the block - the address and data that it describes. */ - -struct dcache_block * -dcache_alloc () -{ - register struct dcache_block *db; - - if ((db = dcache_free.next) == &dcache_free) - /* If we can't get one from the free list, take last valid */ - db = dcache_valid.last; - - remque (db); - insque (db, &dcache_valid); - return (db); -} - -/* Return the contents of the word at address ADDR in the remote machine, - using the data cache. */ - -int -dcache_fetch (addr) - CORE_ADDR addr; -{ - register struct dcache_block *db; - - db = dcache_hit (addr); - if (db == 0) - { - db = dcache_alloc (); - remote_read_bytes (addr & ~0xf, db->data, 16); - db->addr = addr & ~0xf; - } - return (dcache_value (db, addr)); -} - -/* Write the word at ADDR both in the data cache and in the remote machine. */ - -dcache_poke (addr, data) - CORE_ADDR addr; - int data; -{ - register struct dcache_block *db; - - /* First make sure the word is IN the cache. DB is its cache block. */ - db = dcache_hit (addr); - if (db == 0) - { - db = dcache_alloc (); - remote_read_bytes (addr & ~0xf, db->data, 16); - db->addr = addr & ~0xf; - } - - /* Modify the word in the cache. */ - db->data[(addr>>2)&3] = data; - - /* Send the changed word. */ - remote_write_bytes (addr, &data, 4); -} - -/* Initialize the data cache. */ - -dcache_init () -{ - register i; - register struct dcache_block *db; - - db = (struct dcache_block *) xmalloc (sizeof (struct dcache_block) * - DCACHE_SIZE); - dcache_free.next = dcache_free.last = &dcache_free; - dcache_valid.next = dcache_valid.last = &dcache_valid; - for (i=0;i<DCACHE_SIZE;i++,db++) - insque (db, &dcache_free); -} -#endif /* 0 */ - static void remote_kill () { @@ -1099,7 +997,7 @@ static unsigned char break_insn[] = BREAKPOINT; by the caller to be long enough to save sizeof BREAKPOINT bytes (this is accomplished via BREAKPOINT_MAX). */ -int +static int remote_insert_breakpoint (addr, contents_cache) CORE_ADDR addr; char *contents_cache; @@ -1114,7 +1012,7 @@ remote_insert_breakpoint (addr, contents_cache) return val; } -int +static int remote_remove_breakpoint (addr, contents_cache) CORE_ADDR addr; char *contents_cache; @@ -1172,13 +1070,5 @@ void _initialize_remote () { add_target (&remote_ops); - - add_show_from_set ( - add_set_cmd ("remotedebug", no_class, var_boolean, (char *)&kiodebug, - "Set debugging of remote serial I/O.\n\ -When enabled, each packet sent or received with the remote target\n\ -is displayed.", &setlist), - &showlist); } - #endif |