X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Ffindvar.c;h=0f116ed9adfe3d197be72dd7a72f3f96572e57d7;hb=4867e41ec74924c20f3c3c83984f0ccad9b320ba;hp=3f3721f5bc5ed3c518aa8450ff7c5f2b4e683e7e;hpb=bc1821e659134bd92db6c633bb853b4582f982a2;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/findvar.c b/gdb/findvar.c index 3f3721f5bc..0f116ed9ad 100644 --- a/gdb/findvar.c +++ b/gdb/findvar.c @@ -1,5 +1,6 @@ /* Find a variable's value in memory, for GDB, the GNU debugger. - Copyright 1986, 87, 89, 91, 94, 95, 96, 1998 + Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, + 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc. This file is part of GDB. @@ -28,23 +29,11 @@ #include "inferior.h" #include "target.h" #include "gdb_string.h" +#include "gdb_assert.h" #include "floatformat.h" #include "symfile.h" /* for overlay functions */ - -/* This is used to indicate that we don't know the format of the floating point - number. Typically, this is useful for native ports, where the actual format - is irrelevant, since no conversions will be taking place. */ - -const struct floatformat floatformat_unknown; - -/* Registers we shouldn't try to store. */ -#if !defined (CANNOT_STORE_REGISTER) -#define CANNOT_STORE_REGISTER(regno) 0 -#endif - -static void write_register_gen PARAMS ((int, char *)); - -static int read_relative_register_raw_bytes_for_frame PARAMS ((int regnum, char *myaddr, struct frame_info * frame)); +#include "regcache.h" +#include "builtin-regs.h" /* Basic byte-swapping routines. GDB has needed these for a long time... All extract a target-format integer at ADDR which is LEN bytes long. */ @@ -68,11 +57,11 @@ extract_signed_integer (void *addr, int len) if (len > (int) sizeof (LONGEST)) error ("\ That operation is not available on integers of more than %d bytes.", - sizeof (LONGEST)); + (int) sizeof (LONGEST)); /* Start at the most significant end of the integer, and work towards the least significant. */ - if (TARGET_BYTE_ORDER == BIG_ENDIAN) + if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) { p = startaddr; /* Do the sign extension once at the start. */ @@ -102,12 +91,12 @@ extract_unsigned_integer (void *addr, int len) if (len > (int) sizeof (ULONGEST)) error ("\ That operation is not available on integers of more than %d bytes.", - sizeof (ULONGEST)); + (int) sizeof (ULONGEST)); /* Start at the most significant end of the integer, and work towards the least significant. */ retval = 0; - if (TARGET_BYTE_ORDER == BIG_ENDIAN) + if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) { for (p = startaddr; p < endaddr; ++p) retval = (retval << 8) | *p; @@ -132,7 +121,7 @@ extract_long_unsigned_integer (void *addr, int orig_len, LONGEST *pval) int len; len = orig_len; - if (TARGET_BYTE_ORDER == BIG_ENDIAN) + if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) { for (p = (char *) addr; len > (int) sizeof (LONGEST) && p < (char *) addr + orig_len; @@ -199,7 +188,8 @@ extract_typed_address (void *buf, struct type *type) { if (TYPE_CODE (type) != TYPE_CODE_PTR && TYPE_CODE (type) != TYPE_CODE_REF) - internal_error ("findvar.c (extract_typed_address): " + internal_error (__FILE__, __LINE__, + "extract_typed_address: " "type is not a pointer or reference"); return POINTER_TO_ADDRESS (type, buf); @@ -215,7 +205,7 @@ store_signed_integer (void *addr, int len, LONGEST val) /* Start at the least significant end of the integer, and work towards the most significant. */ - if (TARGET_BYTE_ORDER == BIG_ENDIAN) + if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) { for (p = endaddr - 1; p >= startaddr; --p) { @@ -242,7 +232,7 @@ store_unsigned_integer (void *addr, int len, ULONGEST val) /* Start at the least significant end of the integer, and work towards the most significant. */ - if (TARGET_BYTE_ORDER == BIG_ENDIAN) + if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) { for (p = endaddr - 1; p >= startaddr; --p) { @@ -285,7 +275,8 @@ store_typed_address (void *buf, struct type *type, CORE_ADDR addr) { if (TYPE_CODE (type) != TYPE_CODE_PTR && TYPE_CODE (type) != TYPE_CODE_REF) - internal_error ("findvar.c (store_typed_address): " + internal_error (__FILE__, __LINE__, + "store_typed_address: " "type is not a pointer or reference"); ADDRESS_TO_POINTER (type, buf, addr); @@ -293,317 +284,31 @@ store_typed_address (void *buf, struct type *type, CORE_ADDR addr) - -/* Extract a floating-point number from a target-order byte-stream at ADDR. - Returns the value as type DOUBLEST. - - If the host and target formats agree, we just copy the raw data into the - appropriate type of variable and return, letting the host increase precision - as necessary. Otherwise, we call the conversion routine and let it do the - dirty work. */ - -DOUBLEST -extract_floating (void *addr, int len) -{ - DOUBLEST dretval; - - if (len * TARGET_CHAR_BIT == TARGET_FLOAT_BIT) - { - if (HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT) - { - float retval; - - memcpy (&retval, addr, sizeof (retval)); - return retval; - } - else - floatformat_to_doublest (TARGET_FLOAT_FORMAT, addr, &dretval); - } - else if (len * TARGET_CHAR_BIT == TARGET_DOUBLE_BIT) - { - if (HOST_DOUBLE_FORMAT == TARGET_DOUBLE_FORMAT) - { - double retval; - - memcpy (&retval, addr, sizeof (retval)); - return retval; - } - else - floatformat_to_doublest (TARGET_DOUBLE_FORMAT, addr, &dretval); - } - else if (len * TARGET_CHAR_BIT == TARGET_LONG_DOUBLE_BIT) - { - if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT) - { - DOUBLEST retval; - - memcpy (&retval, addr, sizeof (retval)); - return retval; - } - else - floatformat_to_doublest (TARGET_LONG_DOUBLE_FORMAT, addr, &dretval); - } - else - { - error ("Can't deal with a floating point number of %d bytes.", len); - } - - return dretval; -} - -void -store_floating (void *addr, int len, DOUBLEST val) -{ - if (len * TARGET_CHAR_BIT == TARGET_FLOAT_BIT) - { - if (HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT) - { - float floatval = val; - - memcpy (addr, &floatval, sizeof (floatval)); - } - else - floatformat_from_doublest (TARGET_FLOAT_FORMAT, &val, addr); - } - else if (len * TARGET_CHAR_BIT == TARGET_DOUBLE_BIT) - { - if (HOST_DOUBLE_FORMAT == TARGET_DOUBLE_FORMAT) - { - double doubleval = val; - - memcpy (addr, &doubleval, sizeof (doubleval)); - } - else - floatformat_from_doublest (TARGET_DOUBLE_FORMAT, &val, addr); - } - else if (len * TARGET_CHAR_BIT == TARGET_LONG_DOUBLE_BIT) - { - if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT) - memcpy (addr, &val, sizeof (val)); - else - floatformat_from_doublest (TARGET_LONG_DOUBLE_FORMAT, &val, addr); - } - else - { - error ("Can't deal with a floating point number of %d bytes.", len); - } -} - - -/* Return the address in which frame FRAME's value of register REGNUM - has been saved in memory. Or return zero if it has not been saved. - If REGNUM specifies the SP, the value we return is actually - the SP value, not an address where it was saved. */ - -CORE_ADDR -find_saved_register (frame, regnum) - struct frame_info *frame; - int regnum; -{ - register struct frame_info *frame1 = NULL; - register CORE_ADDR addr = 0; - - if (frame == NULL) /* No regs saved if want current frame */ - return 0; - -#ifdef HAVE_REGISTER_WINDOWS - /* We assume that a register in a register window will only be saved - in one place (since the name changes and/or disappears as you go - towards inner frames), so we only call get_frame_saved_regs on - the current frame. This is directly in contradiction to the - usage below, which assumes that registers used in a frame must be - saved in a lower (more interior) frame. This change is a result - of working on a register window machine; get_frame_saved_regs - always returns the registers saved within a frame, within the - context (register namespace) of that frame. */ - - /* However, note that we don't want this to return anything if - nothing is saved (if there's a frame inside of this one). Also, - callers to this routine asking for the stack pointer want the - stack pointer saved for *this* frame; this is returned from the - next frame. */ - - if (REGISTER_IN_WINDOW_P (regnum)) - { - frame1 = get_next_frame (frame); - if (!frame1) - return 0; /* Registers of this frame are active. */ - - /* Get the SP from the next frame in; it will be this - current frame. */ - if (regnum != SP_REGNUM) - frame1 = frame; - - FRAME_INIT_SAVED_REGS (frame1); - return frame1->saved_regs[regnum]; /* ... which might be zero */ - } -#endif /* HAVE_REGISTER_WINDOWS */ - - /* Note that this next routine assumes that registers used in - frame x will be saved only in the frame that x calls and - frames interior to it. This is not true on the sparc, but the - above macro takes care of it, so we should be all right. */ - while (1) - { - QUIT; - frame1 = get_prev_frame (frame1); - if (frame1 == 0 || frame1 == frame) - break; - FRAME_INIT_SAVED_REGS (frame1); - if (frame1->saved_regs[regnum]) - addr = frame1->saved_regs[regnum]; - } - - return addr; -} - -/* Find register number REGNUM relative to FRAME and put its (raw, - target format) contents in *RAW_BUFFER. Set *OPTIMIZED if the - variable was optimized out (and thus can't be fetched). Set *LVAL - to lval_memory, lval_register, or not_lval, depending on whether - the value was fetched from memory, from a register, or in a strange - and non-modifiable way (e.g. a frame pointer which was calculated - rather than fetched). Set *ADDRP to the address, either in memory - on as a REGISTER_BYTE offset into the registers array. - - Note that this implementation never sets *LVAL to not_lval. But - it can be replaced by defining GET_SAVED_REGISTER and supplying - your own. - - The argument RAW_BUFFER must point to aligned memory. */ - -void -default_get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval) - char *raw_buffer; - int *optimized; - CORE_ADDR *addrp; - struct frame_info *frame; - int regnum; - enum lval_type *lval; -{ - CORE_ADDR addr; - - if (!target_has_registers) - error ("No registers."); - - /* Normal systems don't optimize out things with register numbers. */ - if (optimized != NULL) - *optimized = 0; - addr = find_saved_register (frame, regnum); - if (addr != 0) - { - if (lval != NULL) - *lval = lval_memory; - if (regnum == SP_REGNUM) - { - if (raw_buffer != NULL) - { - /* Put it back in target format. */ - store_address (raw_buffer, REGISTER_RAW_SIZE (regnum), - (LONGEST) addr); - } - if (addrp != NULL) - *addrp = 0; - return; - } - if (raw_buffer != NULL) - read_memory (addr, raw_buffer, REGISTER_RAW_SIZE (regnum)); - } - else - { - if (lval != NULL) - *lval = lval_register; - addr = REGISTER_BYTE (regnum); - if (raw_buffer != NULL) - read_register_gen (regnum, raw_buffer); - } - if (addrp != NULL) - *addrp = addr; -} - -#if !defined (GET_SAVED_REGISTER) -#define GET_SAVED_REGISTER(raw_buffer, optimized, addrp, frame, regnum, lval) \ - default_get_saved_register(raw_buffer, optimized, addrp, frame, regnum, lval) -#endif -void -get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval) - char *raw_buffer; - int *optimized; - CORE_ADDR *addrp; - struct frame_info *frame; - int regnum; - enum lval_type *lval; -{ - GET_SAVED_REGISTER (raw_buffer, optimized, addrp, frame, regnum, lval); -} - -/* Copy the bytes of register REGNUM, relative to the input stack frame, - into our memory at MYADDR, in target byte order. - The number of bytes copied is REGISTER_RAW_SIZE (REGNUM). - - Returns 1 if could not be read, 0 if could. */ - -static int -read_relative_register_raw_bytes_for_frame (regnum, myaddr, frame) - int regnum; - char *myaddr; - struct frame_info *frame; -{ - int optim; - if (regnum == FP_REGNUM && frame) - { - /* Put it back in target format. */ - store_address (myaddr, REGISTER_RAW_SIZE (FP_REGNUM), - (LONGEST) FRAME_FP (frame)); - - return 0; - } - - get_saved_register (myaddr, &optim, (CORE_ADDR *) NULL, frame, - regnum, (enum lval_type *) NULL); - - if (register_valid[regnum] < 0) - return 1; /* register value not available */ - - return optim; -} - -/* Copy the bytes of register REGNUM, relative to the current stack frame, - into our memory at MYADDR, in target byte order. - The number of bytes copied is REGISTER_RAW_SIZE (REGNUM). - - Returns 1 if could not be read, 0 if could. */ - -int -read_relative_register_raw_bytes (regnum, myaddr) - int regnum; - char *myaddr; -{ - return read_relative_register_raw_bytes_for_frame (regnum, myaddr, - selected_frame); -} - -/* Return a `value' with the contents of register REGNUM - in its virtual format, with the type specified by - REGISTER_VIRTUAL_TYPE. +/* Return a `value' with the contents of (virtual or cooked) register + REGNUM as found in the specified FRAME. The register's type is + determined by REGISTER_VIRTUAL_TYPE. - NOTE: returns NULL if register value is not available. - Caller will check return value or die! */ + NOTE: returns NULL if register value is not available. Caller will + check return value or die! */ -value_ptr -value_of_register (regnum) - int regnum; +struct value * +value_of_register (int regnum, struct frame_info *frame) { CORE_ADDR addr; int optim; - register value_ptr reg_val; - char raw_buffer[MAX_REGISTER_RAW_SIZE]; + struct value *reg_val; + char *raw_buffer = (char*) alloca (MAX_REGISTER_RAW_SIZE); enum lval_type lval; + /* Builtin registers lie completly outside of the range of normal + registers. Catch them early so that the target never sees them. */ + if (regnum >= NUM_REGS + NUM_PSEUDO_REGS) + return value_of_builtin_reg (regnum, selected_frame); + get_saved_register (raw_buffer, &optim, &addr, - selected_frame, regnum, &lval); + frame, regnum, &lval); - if (register_valid[regnum] < 0) + if (register_cached (regnum) < 0) return NULL; /* register value not available */ reg_val = allocate_value (REGISTER_VIRTUAL_TYPE (regnum)); @@ -619,7 +324,8 @@ value_of_register (regnum) memcpy (VALUE_CONTENTS_RAW (reg_val), raw_buffer, REGISTER_RAW_SIZE (regnum)); else - internal_error ("Register \"%s\" (%d) has conflicting raw (%d) and virtual (%d) size", + internal_error (__FILE__, __LINE__, + "Register \"%s\" (%d) has conflicting raw (%d) and virtual (%d) size", REGISTER_NAME (regnum), regnum, REGISTER_RAW_SIZE (regnum), @@ -630,608 +336,40 @@ value_of_register (regnum) VALUE_OPTIMIZED_OUT (reg_val) = optim; return reg_val; } - -/* Low level examining and depositing of registers. - - The caller is responsible for making - sure that the inferior is stopped before calling the fetching routines, - or it will get garbage. (a change from GDB version 3, in which - the caller got the value from the last stop). */ - -/* Contents and state of the registers (in target byte order). */ - -char *registers; - -/* VALID_REGISTER is non-zero if it has been fetched, -1 if the - register value was not available. */ - -signed char *register_valid; - -/* The thread/process associated with the current set of registers. For now, - -1 is special, and means `no current process'. */ -int registers_pid = -1; - -/* Indicate that registers may have changed, so invalidate the cache. */ - -void -registers_changed () -{ - int i; - int numregs = ARCH_NUM_REGS; - - registers_pid = -1; - - /* Force cleanup of any alloca areas if using C alloca instead of - a builtin alloca. This particular call is used to clean up - areas allocated by low level target code which may build up - during lengthy interactions between gdb and the target before - gdb gives control to the user (ie watchpoints). */ - alloca (0); - - for (i = 0; i < numregs; i++) - register_valid[i] = 0; - - if (registers_changed_hook) - registers_changed_hook (); -} - -/* Indicate that all registers have been fetched, so mark them all valid. */ -void -registers_fetched () -{ - int i; - int numregs = ARCH_NUM_REGS; - for (i = 0; i < numregs; i++) - register_valid[i] = 1; -} - -/* read_register_bytes and write_register_bytes are generally a *BAD* - idea. They are inefficient because they need to check for partial - updates, which can only be done by scanning through all of the - registers and seeing if the bytes that are being read/written fall - inside of an invalid register. [The main reason this is necessary - is that register sizes can vary, so a simple index won't suffice.] - It is far better to call read_register_gen and write_register_gen - if you want to get at the raw register contents, as it only takes a - regno as an argument, and therefore can't do a partial register - update. - - Prior to the recent fixes to check for partial updates, both read - and write_register_bytes always checked to see if any registers - were stale, and then called target_fetch_registers (-1) to update - the whole set. This caused really slowed things down for remote - targets. */ - -/* Copy INLEN bytes of consecutive data from registers - starting with the INREGBYTE'th byte of register data - into memory at MYADDR. */ - -void -read_register_bytes (inregbyte, myaddr, inlen) - int inregbyte; - char *myaddr; - int inlen; -{ - int inregend = inregbyte + inlen; - int regno; - - if (registers_pid != inferior_pid) - { - registers_changed (); - registers_pid = inferior_pid; - } - - /* See if we are trying to read bytes from out-of-date registers. If so, - update just those registers. */ - - for (regno = 0; regno < NUM_REGS; regno++) - { - int regstart, regend; - - if (register_valid[regno]) - continue; - - if (REGISTER_NAME (regno) == NULL || *REGISTER_NAME (regno) == '\0') - continue; - - regstart = REGISTER_BYTE (regno); - regend = regstart + REGISTER_RAW_SIZE (regno); - - if (regend <= inregbyte || inregend <= regstart) - /* The range the user wants to read doesn't overlap with regno. */ - continue; - - /* We've found an invalid register where at least one byte will be read. - Update it from the target. */ - target_fetch_registers (regno); - - if (!register_valid[regno]) - error ("read_register_bytes: Couldn't update register %d.", regno); - } - - if (myaddr != NULL) - memcpy (myaddr, ®isters[inregbyte], inlen); -} - -/* Read register REGNO into memory at MYADDR, which must be large enough - for REGISTER_RAW_BYTES (REGNO). Target byte-order. - If the register is known to be the size of a CORE_ADDR or smaller, - read_register can be used instead. */ -void -read_register_gen (regno, myaddr) - int regno; - char *myaddr; -{ - if (registers_pid != inferior_pid) - { - registers_changed (); - registers_pid = inferior_pid; - } - - if (!register_valid[regno]) - target_fetch_registers (regno); - memcpy (myaddr, ®isters[REGISTER_BYTE (regno)], - REGISTER_RAW_SIZE (regno)); -} - -/* Write register REGNO at MYADDR to the target. MYADDR points at - REGISTER_RAW_BYTES(REGNO), which must be in target byte-order. */ - -static void -write_register_gen (regno, myaddr) - int regno; - char *myaddr; -{ - int size; - - /* On the sparc, writing %g0 is a no-op, so we don't even want to change - the registers array if something writes to this register. */ - if (CANNOT_STORE_REGISTER (regno)) - return; - - if (registers_pid != inferior_pid) - { - registers_changed (); - registers_pid = inferior_pid; - } - - size = REGISTER_RAW_SIZE (regno); - - /* If we have a valid copy of the register, and new value == old value, - then don't bother doing the actual store. */ - - if (register_valid[regno] - && memcmp (®isters[REGISTER_BYTE (regno)], myaddr, size) == 0) - return; - - target_prepare_to_store (); - - memcpy (®isters[REGISTER_BYTE (regno)], myaddr, size); - - register_valid[regno] = 1; - - target_store_registers (regno); -} - -/* Copy INLEN bytes of consecutive data from memory at MYADDR - into registers starting with the MYREGSTART'th byte of register data. */ - -void -write_register_bytes (myregstart, myaddr, inlen) - int myregstart; - char *myaddr; - int inlen; -{ - int myregend = myregstart + inlen; - int regno; - - target_prepare_to_store (); - - /* Scan through the registers updating any that are covered by the range - myregstart<=>myregend using write_register_gen, which does nice things - like handling threads, and avoiding updates when the new and old contents - are the same. */ - - for (regno = 0; regno < NUM_REGS; regno++) - { - int regstart, regend; - - regstart = REGISTER_BYTE (regno); - regend = regstart + REGISTER_RAW_SIZE (regno); - - /* Is this register completely outside the range the user is writing? */ - if (myregend <= regstart || regend <= myregstart) - /* do nothing */ ; - - /* Is this register completely within the range the user is writing? */ - else if (myregstart <= regstart && regend <= myregend) - write_register_gen (regno, myaddr + (regstart - myregstart)); - - /* The register partially overlaps the range being written. */ - else - { - char regbuf[MAX_REGISTER_RAW_SIZE]; - /* What's the overlap between this register's bytes and - those the caller wants to write? */ - int overlapstart = max (regstart, myregstart); - int overlapend = min (regend, myregend); - - /* We may be doing a partial update of an invalid register. - Update it from the target before scribbling on it. */ - read_register_gen (regno, regbuf); - - memcpy (registers + overlapstart, - myaddr + (overlapstart - myregstart), - overlapend - overlapstart); - - target_store_registers (regno); - } - } -} - - -/* Return the raw contents of register REGNO, regarding it as an integer. */ -/* This probably should be returning LONGEST rather than CORE_ADDR. */ - -CORE_ADDR -read_register (regno) - int regno; -{ - if (registers_pid != inferior_pid) - { - registers_changed (); - registers_pid = inferior_pid; - } - - if (!register_valid[regno]) - target_fetch_registers (regno); - - return ((CORE_ADDR) - extract_unsigned_integer (®isters[REGISTER_BYTE (regno)], - REGISTER_RAW_SIZE (regno))); -} - -CORE_ADDR -read_register_pid (regno, pid) - int regno, pid; -{ - int save_pid; - CORE_ADDR retval; - - if (pid == inferior_pid) - return read_register (regno); - - save_pid = inferior_pid; - - inferior_pid = pid; - - retval = read_register (regno); - - inferior_pid = save_pid; - - return retval; -} - -/* Store VALUE, into the raw contents of register number REGNO. - This should probably write a LONGEST rather than a CORE_ADDR */ - -void -write_register (regno, val) - int regno; - LONGEST val; -{ - PTR buf; - int size; - - /* On the sparc, writing %g0 is a no-op, so we don't even want to change - the registers array if something writes to this register. */ - if (CANNOT_STORE_REGISTER (regno)) - return; - - if (registers_pid != inferior_pid) - { - registers_changed (); - registers_pid = inferior_pid; - } - - size = REGISTER_RAW_SIZE (regno); - buf = alloca (size); - store_signed_integer (buf, size, (LONGEST) val); - - /* If we have a valid copy of the register, and new value == old value, - then don't bother doing the actual store. */ - - if (register_valid[regno] - && memcmp (®isters[REGISTER_BYTE (regno)], buf, size) == 0) - return; - - target_prepare_to_store (); - - memcpy (®isters[REGISTER_BYTE (regno)], buf, size); - - register_valid[regno] = 1; - - target_store_registers (regno); -} - -void -write_register_pid (regno, val, pid) - int regno; - CORE_ADDR val; - int pid; -{ - int save_pid; - - if (pid == inferior_pid) - { - write_register (regno, val); - return; - } - - save_pid = inferior_pid; - - inferior_pid = pid; - - write_register (regno, val); - - inferior_pid = save_pid; -} - -/* Record that register REGNO contains VAL. - This is used when the value is obtained from the inferior or core dump, - so there is no need to store the value there. - - If VAL is a NULL pointer, then it's probably an unsupported register. We - just set it's value to all zeros. We might want to record this fact, and - report it to the users of read_register and friends. - */ - -void -supply_register (regno, val) - int regno; - char *val; -{ -#if 1 - if (registers_pid != inferior_pid) - { - registers_changed (); - registers_pid = inferior_pid; - } -#endif - - register_valid[regno] = 1; - if (val) - memcpy (®isters[REGISTER_BYTE (regno)], val, REGISTER_RAW_SIZE (regno)); - else - memset (®isters[REGISTER_BYTE (regno)], '\000', REGISTER_RAW_SIZE (regno)); - - /* On some architectures, e.g. HPPA, there are a few stray bits in some - registers, that the rest of the code would like to ignore. */ -#ifdef CLEAN_UP_REGISTER_VALUE - CLEAN_UP_REGISTER_VALUE (regno, ®isters[REGISTER_BYTE (regno)]); -#endif -} - - -/* This routine is getting awfully cluttered with #if's. It's probably - time to turn this into READ_PC and define it in the tm.h file. - Ditto for write_pc. - - 1999-06-08: The following were re-written so that it assumes the - existance of a TARGET_READ_PC et.al. macro. A default generic - version of that macro is made available where needed. - - Since the ``TARGET_READ_PC'' et.al. macro is going to be controlled - by the multi-arch framework, it will eventually be possible to - eliminate the intermediate read_pc_pid(). The client would call - TARGET_READ_PC directly. (cagney). */ - -#ifndef TARGET_READ_PC -#define TARGET_READ_PC generic_target_read_pc -#endif - -CORE_ADDR -generic_target_read_pc (int pid) -{ -#ifdef PC_REGNUM - if (PC_REGNUM >= 0) - { - CORE_ADDR pc_val = ADDR_BITS_REMOVE ((CORE_ADDR) read_register_pid (PC_REGNUM, pid)); - return pc_val; - } -#endif - internal_error ("generic_target_read_pc"); - return 0; -} - -CORE_ADDR -read_pc_pid (pid) - int pid; -{ - int saved_inferior_pid; - CORE_ADDR pc_val; - - /* In case pid != inferior_pid. */ - saved_inferior_pid = inferior_pid; - inferior_pid = pid; - - pc_val = TARGET_READ_PC (pid); - - inferior_pid = saved_inferior_pid; - return pc_val; -} - -CORE_ADDR -read_pc () -{ - return read_pc_pid (inferior_pid); -} - -#ifndef TARGET_WRITE_PC -#define TARGET_WRITE_PC generic_target_write_pc -#endif - -void -generic_target_write_pc (pc, pid) - CORE_ADDR pc; - int pid; -{ -#ifdef PC_REGNUM - if (PC_REGNUM >= 0) - write_register_pid (PC_REGNUM, pc, pid); -#ifdef NPC_REGNUM - if (NPC_REGNUM >= 0) - write_register_pid (NPC_REGNUM, pc + 4, pid); -#ifdef NNPC_REGNUM - if (NNPC_REGNUM >= 0) - write_register_pid (NNPC_REGNUM, pc + 8, pid); -#endif -#endif -#else - internal_error ("generic_target_write_pc"); -#endif -} - -void -write_pc_pid (pc, pid) - CORE_ADDR pc; - int pid; -{ - int saved_inferior_pid; - - /* In case pid != inferior_pid. */ - saved_inferior_pid = inferior_pid; - inferior_pid = pid; - - TARGET_WRITE_PC (pc, pid); - - inferior_pid = saved_inferior_pid; -} - -void -write_pc (pc) - CORE_ADDR pc; -{ - write_pc_pid (pc, inferior_pid); -} - -/* Cope with strage ways of getting to the stack and frame pointers */ - -#ifndef TARGET_READ_SP -#define TARGET_READ_SP generic_target_read_sp -#endif - -CORE_ADDR -generic_target_read_sp () -{ -#ifdef SP_REGNUM - if (SP_REGNUM >= 0) - return read_register (SP_REGNUM); -#endif - internal_error ("generic_target_read_sp"); -} - -CORE_ADDR -read_sp () -{ - return TARGET_READ_SP (); -} - -#ifndef TARGET_WRITE_SP -#define TARGET_WRITE_SP generic_target_write_sp -#endif - -void -generic_target_write_sp (val) - CORE_ADDR val; -{ -#ifdef SP_REGNUM - if (SP_REGNUM >= 0) - { - write_register (SP_REGNUM, val); - return; - } -#endif - internal_error ("generic_target_write_sp"); -} - -void -write_sp (val) - CORE_ADDR val; -{ - TARGET_WRITE_SP (val); -} - -#ifndef TARGET_READ_FP -#define TARGET_READ_FP generic_target_read_fp -#endif - -CORE_ADDR -generic_target_read_fp () -{ -#ifdef FP_REGNUM - if (FP_REGNUM >= 0) - return read_register (FP_REGNUM); -#endif - internal_error ("generic_target_read_fp"); -} - -CORE_ADDR -read_fp () -{ - return TARGET_READ_FP (); -} - -#ifndef TARGET_WRITE_FP -#define TARGET_WRITE_FP generic_target_write_fp -#endif - -void -generic_target_write_fp (val) - CORE_ADDR val; -{ -#ifdef FP_REGNUM - if (FP_REGNUM >= 0) - { - write_register (FP_REGNUM, val); - return; - } -#endif - internal_error ("generic_target_write_fp"); -} - -void -write_fp (val) - CORE_ADDR val; -{ - TARGET_WRITE_FP (val); -} - /* Given a pointer of type TYPE in target form in BUF, return the address it represents. */ CORE_ADDR -generic_pointer_to_address (struct type *type, char *buf) +unsigned_pointer_to_address (struct type *type, void *buf) { return extract_address (buf, TYPE_LENGTH (type)); } +CORE_ADDR +signed_pointer_to_address (struct type *type, void *buf) +{ + return extract_signed_integer (buf, TYPE_LENGTH (type)); +} /* Given an address, store it as a pointer of type TYPE in target format in BUF. */ void -generic_address_to_pointer (struct type *type, char *buf, CORE_ADDR addr) +unsigned_address_to_pointer (struct type *type, void *buf, CORE_ADDR addr) { store_address (buf, TYPE_LENGTH (type), addr); } +void +address_to_signed_pointer (struct type *type, void *buf, CORE_ADDR addr) +{ + store_signed_integer (buf, TYPE_LENGTH (type), addr); +} /* Will calling read_var_value or locate_var_value on SYM end up caring what frame it is being evaluated relative to? SYM must be non-NULL. */ int -symbol_read_needs_frame (sym) - struct symbol *sym; +symbol_read_needs_frame (struct symbol *sym) { switch (SYMBOL_CLASS (sym)) { @@ -1275,12 +413,10 @@ symbol_read_needs_frame (sym) If the variable cannot be found, return a zero pointer. If FRAME is NULL, use the selected_frame. */ -value_ptr -read_var_value (var, frame) - register struct symbol *var; - struct frame_info *frame; +struct value * +read_var_value (register struct symbol *var, struct frame_info *frame) { - register value_ptr v; + register struct value *v; struct type *type = SYMBOL_TYPE (var); CORE_ADDR addr; register int len; @@ -1336,18 +472,21 @@ read_var_value (var, frame) break; case LOC_INDIRECT: - /* The import slot does not have a real address in it from the - dynamic loader (dld.sl on HP-UX), if the target hasn't begun - execution yet, so check for that. */ - if (!target_has_execution) - error ("\ + { + /* The import slot does not have a real address in it from the + dynamic loader (dld.sl on HP-UX), if the target hasn't + begun execution yet, so check for that. */ + CORE_ADDR locaddr; + struct value *loc; + if (!target_has_execution) + error ("\ Attempt to access variable defined in different shared object or load module when\n\ addresses have not been bound by the dynamic loader. Try again when executable is running."); - addr = SYMBOL_VALUE_ADDRESS (var); - addr = read_memory_unsigned_integer - (addr, TARGET_PTR_BIT / TARGET_CHAR_BIT); - break; + locaddr = SYMBOL_VALUE_ADDRESS (var); + loc = value_at (lookup_pointer_type (type), locaddr, NULL); + addr = value_as_address (loc); + } case LOC_ARG: if (frame == NULL) @@ -1359,15 +498,19 @@ addresses have not been bound by the dynamic loader. Try again when executable i break; case LOC_REF_ARG: - if (frame == NULL) - return 0; - addr = FRAME_ARGS_ADDRESS (frame); - if (!addr) - return 0; - addr += SYMBOL_VALUE (var); - addr = read_memory_unsigned_integer - (addr, TARGET_PTR_BIT / TARGET_CHAR_BIT); - break; + { + struct value *ref; + CORE_ADDR argref; + if (frame == NULL) + return 0; + argref = FRAME_ARGS_ADDRESS (frame); + if (!argref) + return 0; + argref += SYMBOL_VALUE (var); + ref = value_at (lookup_pointer_type (type), argref, NULL); + addr = value_as_address (ref); + break; + } case LOC_LOCAL: case LOC_LOCAL_ARG: @@ -1379,22 +522,15 @@ addresses have not been bound by the dynamic loader. Try again when executable i case LOC_BASEREG: case LOC_BASEREG_ARG: - { - char buf[MAX_REGISTER_RAW_SIZE]; - get_saved_register (buf, NULL, NULL, frame, SYMBOL_BASEREG (var), - NULL); - addr = extract_address (buf, REGISTER_RAW_SIZE (SYMBOL_BASEREG (var))); - addr += SYMBOL_VALUE (var); - break; - } - case LOC_THREAD_LOCAL_STATIC: { - char buf[MAX_REGISTER_RAW_SIZE]; + struct value *regval; - get_saved_register (buf, NULL, NULL, frame, SYMBOL_BASEREG (var), - NULL); - addr = extract_address (buf, REGISTER_RAW_SIZE (SYMBOL_BASEREG (var))); + regval = value_from_register (lookup_pointer_type (type), + SYMBOL_BASEREG (var), frame); + if (regval == NULL) + error ("Value of base register not available."); + addr = value_as_address (regval); addr += SYMBOL_VALUE (var); break; } @@ -1417,11 +553,11 @@ addresses have not been bound by the dynamic loader. Try again when executable i { struct block *b; int regno = SYMBOL_VALUE (var); - value_ptr regval; + struct value *regval; if (frame == NULL) return 0; - b = get_frame_block (frame); + b = get_frame_block (frame, 0); if (SYMBOL_CLASS (var) == LOC_REGPARM_ADDR) { @@ -1432,7 +568,7 @@ addresses have not been bound by the dynamic loader. Try again when executable i if (regval == NULL) error ("Value of register variable not available."); - addr = value_as_pointer (regval); + addr = value_as_address (regval); VALUE_LVAL (v) = lval_memory; } else @@ -1477,21 +613,18 @@ addresses have not been bound by the dynamic loader. Try again when executable i } /* Return a value of type TYPE, stored in register REGNUM, in frame - FRAME. + FRAME. NOTE: returns NULL if register value is not available. Caller will check return value or die! */ -value_ptr -value_from_register (type, regnum, frame) - struct type *type; - int regnum; - struct frame_info *frame; +struct value * +value_from_register (struct type *type, int regnum, struct frame_info *frame) { - char raw_buffer[MAX_REGISTER_RAW_SIZE]; + char *raw_buffer = (char*) alloca (MAX_REGISTER_RAW_SIZE); CORE_ADDR addr; int optim; - value_ptr v = allocate_value (type); + struct value *v = allocate_value (type); char *value_bytes = 0; int value_bytes_copied = 0; int num_storage_locs; @@ -1501,10 +634,6 @@ value_from_register (type, regnum, frame) CHECK_TYPEDEF (type); len = TYPE_LENGTH (type); - /* Pointers on D10V are really only 16 bits, but we lie to gdb elsewhere... */ - if (GDB_TARGET_IS_D10V && TYPE_CODE (type) == TYPE_CODE_PTR) - len = 2; - VALUE_REGNO (v) = regnum; num_storage_locs = (len > REGISTER_VIRTUAL_SIZE (regnum) ? @@ -1568,7 +697,7 @@ value_from_register (type, regnum, frame) page_regnum, &lval); - if (register_valid[page_regnum] == -1) + if (register_cached (page_regnum) == -1) return NULL; /* register value not available */ if (lval == lval_register) @@ -1585,7 +714,7 @@ value_from_register (type, regnum, frame) regnum, &lval); - if (register_valid[regnum] == -1) + if (register_cached (regnum) == -1) return NULL; /* register value not available */ if (lval == lval_register) @@ -1611,7 +740,7 @@ value_from_register (type, regnum, frame) local_regnum, &lval); - if (register_valid[local_regnum] == -1) + if (register_cached (local_regnum) == -1) return NULL; /* register value not available */ if (regnum == local_regnum) @@ -1650,7 +779,8 @@ value_from_register (type, regnum, frame) VALUE_ADDRESS (v) = first_addr; } else - internal_error ("value_from_register: Value not stored anywhere!"); + internal_error (__FILE__, __LINE__, + "value_from_register: Value not stored anywhere!"); VALUE_OPTIMIZED_OUT (v) = optim; @@ -1676,7 +806,7 @@ value_from_register (type, regnum, frame) get_saved_register (raw_buffer, &optim, &addr, frame, regnum, &lval); - if (register_valid[regnum] == -1) + if (register_cached (regnum) == -1) return NULL; /* register value not available */ VALUE_OPTIMIZED_OUT (v) = optim; @@ -1694,7 +824,7 @@ value_from_register (type, regnum, frame) { /* Raw and virtual formats are the same for this register. */ - if (TARGET_BYTE_ORDER == BIG_ENDIAN && len < REGISTER_RAW_SIZE (regnum)) + if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG && len < REGISTER_RAW_SIZE (regnum)) { /* Big-endian, and we want less than full size. */ VALUE_OFFSET (v) = REGISTER_RAW_SIZE (regnum) - len; @@ -1703,29 +833,6 @@ value_from_register (type, regnum, frame) memcpy (VALUE_CONTENTS_RAW (v), raw_buffer + VALUE_OFFSET (v), len); } - if (GDB_TARGET_IS_D10V - && TYPE_CODE (type) == TYPE_CODE_PTR - && TYPE_TARGET_TYPE (type) - && (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC)) - { - /* pointer to function */ - unsigned long num; - unsigned short snum; - snum = (unsigned short) extract_unsigned_integer (VALUE_CONTENTS_RAW (v), 2); - num = D10V_MAKE_IADDR (snum); - store_address (VALUE_CONTENTS_RAW (v), 4, num); - } - else if (GDB_TARGET_IS_D10V - && TYPE_CODE (type) == TYPE_CODE_PTR) - { - /* pointer to data */ - unsigned long num; - unsigned short snum; - snum = (unsigned short) extract_unsigned_integer (VALUE_CONTENTS_RAW (v), 2); - num = D10V_MAKE_DADDR (snum); - store_address (VALUE_CONTENTS_RAW (v), 4, num); - } - return v; } @@ -1734,14 +841,12 @@ value_from_register (type, regnum, frame) return a (pointer to a) struct value containing the properly typed address. */ -value_ptr -locate_var_value (var, frame) - register struct symbol *var; - struct frame_info *frame; +struct value * +locate_var_value (register struct symbol *var, struct frame_info *frame) { CORE_ADDR addr = 0; struct type *type = SYMBOL_TYPE (var); - value_ptr lazy_value; + struct value *lazy_value; /* Evaluate it first; if the result is a memory address, we're fine. Lazy evaluation pays off here. */ @@ -1753,7 +858,7 @@ locate_var_value (var, frame) if (VALUE_LAZY (lazy_value) || TYPE_CODE (type) == TYPE_CODE_FUNC) { - value_ptr val; + struct value *val; addr = VALUE_ADDRESS (lazy_value); val = value_from_pointer (lookup_pointer_type (type), addr); @@ -1765,9 +870,21 @@ locate_var_value (var, frame) switch (VALUE_LVAL (lazy_value)) { case lval_register: + gdb_assert (REGISTER_NAME (VALUE_REGNO (lazy_value)) != NULL + && *REGISTER_NAME (VALUE_REGNO (lazy_value)) != '\0'); + error("Address requested for identifier " + "\"%s\" which is in register $%s", + SYMBOL_SOURCE_NAME (var), + REGISTER_NAME (VALUE_REGNO (lazy_value))); + break; + case lval_reg_frame_relative: - error ("Address requested for identifier \"%s\" which is in a register.", - SYMBOL_SOURCE_NAME (var)); + gdb_assert (REGISTER_NAME (VALUE_FRAME_REGNUM (lazy_value)) != NULL + && *REGISTER_NAME (VALUE_FRAME_REGNUM (lazy_value)) != '\0'); + error("Address requested for identifier " + "\"%s\" which is in frame register $%s", + SYMBOL_SOURCE_NAME (var), + REGISTER_NAME (VALUE_FRAME_REGNUM (lazy_value))); break; default: @@ -1777,29 +894,3 @@ locate_var_value (var, frame) } return 0; /* For lint -- never reached */ } - - -static void build_findvar PARAMS ((void)); -static void -build_findvar () -{ - /* We allocate some extra slop since we do a lot of memcpy's around - `registers', and failing-soft is better than failing hard. */ - int sizeof_registers = REGISTER_BYTES + /* SLOP */ 256; - int sizeof_register_valid = NUM_REGS * sizeof (*register_valid); - registers = xmalloc (sizeof_registers); - memset (registers, 0, sizeof_registers); - register_valid = xmalloc (sizeof_register_valid); - memset (register_valid, 0, sizeof_register_valid); -} - -void _initialize_findvar PARAMS ((void)); -void -_initialize_findvar () -{ - build_findvar (); - - register_gdbarch_swap (®isters, sizeof (registers), NULL); - register_gdbarch_swap (®ister_valid, sizeof (register_valid), NULL); - register_gdbarch_swap (NULL, 0, build_findvar); -}