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Diffstat (limited to 'gdb/findvar.c')
| -rw-r--r-- | gdb/findvar.c | 1553 |
1 files changed, 0 insertions, 1553 deletions
diff --git a/gdb/findvar.c b/gdb/findvar.c deleted file mode 100644 index 298abf7..0000000 --- a/gdb/findvar.c +++ /dev/null @@ -1,1553 +0,0 @@ -/* Find a variable's value in memory, for GDB, the GNU debugger. - Copyright 1986, 87, 89, 91, 94, 95, 96, 1998 - Free Software Foundation, Inc. - -This file is part of GDB. - -This program is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2 of the License, or -(at your option) any later version. - -This program is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with this program; if not, write to the Free Software -Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -#include "defs.h" -#include "symtab.h" -#include "gdbtypes.h" -#include "frame.h" -#include "value.h" -#include "gdbcore.h" -#include "inferior.h" -#include "target.h" -#include "gdb_string.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 *)); - -/* 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. */ - -#if TARGET_CHAR_BIT != 8 || HOST_CHAR_BIT != 8 - /* 8 bit characters are a pretty safe assumption these days, so we - assume it throughout all these swapping routines. If we had to deal with - 9 bit characters, we would need to make len be in bits and would have - to re-write these routines... */ - you lose -#endif - -LONGEST -extract_signed_integer (addr, len) - PTR addr; - int len; -{ - LONGEST retval; - unsigned char *p; - unsigned char *startaddr = (unsigned char *)addr; - unsigned char *endaddr = startaddr + len; - - if (len > (int) sizeof (LONGEST)) - error ("\ -That operation is not available on integers of more than %d bytes.", - sizeof (LONGEST)); - - /* Start at the most significant end of the integer, and work towards - the least significant. */ - if (TARGET_BYTE_ORDER == BIG_ENDIAN) - { - p = startaddr; - /* Do the sign extension once at the start. */ - retval = ((LONGEST)*p ^ 0x80) - 0x80; - for (++p; p < endaddr; ++p) - retval = (retval << 8) | *p; - } - else - { - p = endaddr - 1; - /* Do the sign extension once at the start. */ - retval = ((LONGEST)*p ^ 0x80) - 0x80; - for (--p; p >= startaddr; --p) - retval = (retval << 8) | *p; - } - return retval; -} - -ULONGEST -extract_unsigned_integer (addr, len) - PTR addr; - int len; -{ - ULONGEST retval; - unsigned char *p; - unsigned char *startaddr = (unsigned char *)addr; - unsigned char *endaddr = startaddr + len; - - if (len > (int) sizeof (ULONGEST)) - error ("\ -That operation is not available on integers of more than %d bytes.", - 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) - { - for (p = startaddr; p < endaddr; ++p) - retval = (retval << 8) | *p; - } - else - { - for (p = endaddr - 1; p >= startaddr; --p) - retval = (retval << 8) | *p; - } - return retval; -} - -/* Sometimes a long long unsigned integer can be extracted as a - LONGEST value. This is done so that we can print these values - better. If this integer can be converted to a LONGEST, this - function returns 1 and sets *PVAL. Otherwise it returns 0. */ - -int -extract_long_unsigned_integer (addr, orig_len, pval) - PTR addr; - int orig_len; - LONGEST *pval; -{ - char *p, *first_addr; - int len; - - len = orig_len; - if (TARGET_BYTE_ORDER == BIG_ENDIAN) - { - for (p = (char *) addr; - len > (int) sizeof (LONGEST) && p < (char *) addr + orig_len; - p++) - { - if (*p == 0) - len--; - else - break; - } - first_addr = p; - } - else - { - first_addr = (char *) addr; - for (p = (char *) addr + orig_len - 1; - len > (int) sizeof (LONGEST) && p >= (char *) addr; - p--) - { - if (*p == 0) - len--; - else - break; - } - } - - if (len <= (int) sizeof (LONGEST)) - { - *pval = (LONGEST) extract_unsigned_integer (first_addr, - sizeof (LONGEST)); - return 1; - } - - return 0; -} - -CORE_ADDR -extract_address (addr, len) - PTR addr; - int len; -{ - /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure - whether we want this to be true eventually. */ - return extract_unsigned_integer (addr, len); -} - -void -store_signed_integer (addr, len, val) - PTR addr; - int len; - LONGEST val; -{ - unsigned char *p; - unsigned char *startaddr = (unsigned char *)addr; - unsigned char *endaddr = startaddr + len; - - /* Start at the least significant end of the integer, and work towards - the most significant. */ - if (TARGET_BYTE_ORDER == BIG_ENDIAN) - { - for (p = endaddr - 1; p >= startaddr; --p) - { - *p = val & 0xff; - val >>= 8; - } - } - else - { - for (p = startaddr; p < endaddr; ++p) - { - *p = val & 0xff; - val >>= 8; - } - } -} - -void -store_unsigned_integer (addr, len, val) - PTR addr; - int len; - ULONGEST val; -{ - unsigned char *p; - unsigned char *startaddr = (unsigned char *)addr; - unsigned char *endaddr = startaddr + len; - - /* Start at the least significant end of the integer, and work towards - the most significant. */ - if (TARGET_BYTE_ORDER == BIG_ENDIAN) - { - for (p = endaddr - 1; p >= startaddr; --p) - { - *p = val & 0xff; - val >>= 8; - } - } - else - { - for (p = startaddr; p < endaddr; ++p) - { - *p = val & 0xff; - val >>= 8; - } - } -} - -void -store_address (addr, len, val) - PTR addr; - int len; - CORE_ADDR val; -{ - /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure - whether we want this to be true eventually. */ - store_unsigned_integer (addr, len, (LONGEST)val); -} - -/* Swap LEN bytes at BUFFER between target and host byte-order. */ -#define SWAP_FLOATING(buffer,len) \ - do \ - { \ - if (TARGET_BYTE_ORDER != HOST_BYTE_ORDER) \ - { \ - char tmp; \ - char *p = (char *)(buffer); \ - char *q = ((char *)(buffer)) + len - 1; \ - for (; p < q; p++, q--) \ - { \ - tmp = *q; \ - *q = *p; \ - *p = tmp; \ - } \ - } \ - } \ - while (0) - -/* 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 (addr, len) - PTR addr; - int len; -{ - DOUBLEST dretval; - - if (len == sizeof (float)) - { - 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 == sizeof (double)) - { - 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 == sizeof (DOUBLEST)) - { - 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 (addr, len, val) - PTR addr; - int len; - DOUBLEST val; -{ - if (len == sizeof (float)) - { - 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 == sizeof (double)) - { - 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 == sizeof (DOUBLEST)) - { - 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); - } -} - -#if !defined (GET_SAVED_REGISTER) - -/* 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; -{ - struct frame_saved_regs saved_regs; - - 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; - - get_frame_saved_regs (frame1, &saved_regs); - return saved_regs.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; - get_frame_saved_regs (frame1, &saved_regs); - if (saved_regs.regs[regnum]) - addr = saved_regs.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 -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), 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; -} -#endif /* GET_SAVED_REGISTER. */ - -/* 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; -{ - int optim; - if (regnum == FP_REGNUM && selected_frame) - { - /* Put it back in target format. */ - store_address (myaddr, REGISTER_RAW_SIZE(FP_REGNUM), - FRAME_FP(selected_frame)); - return 0; - } - - get_saved_register (myaddr, &optim, (CORE_ADDR *) NULL, selected_frame, - regnum, (enum lval_type *)NULL); - - if (register_valid [regnum] < 0) - return 1; /* register value not available */ - - return optim; -} - -/* Return a `value' with the contents of register REGNUM - in its virtual format, with the type specified by - REGISTER_VIRTUAL_TYPE. - - NOTE: returns NULL if register value is not available. - Caller will check return value or die! */ - -value_ptr -value_of_register (regnum) - int regnum; -{ - CORE_ADDR addr; - int optim; - register value_ptr reg_val; - char raw_buffer[MAX_REGISTER_RAW_SIZE]; - enum lval_type lval; - - get_saved_register (raw_buffer, &optim, &addr, - selected_frame, regnum, &lval); - - if (register_valid[regnum] < 0) - return NULL; /* register value not available */ - - reg_val = allocate_value (REGISTER_VIRTUAL_TYPE (regnum)); - - /* Convert raw data to virtual format if necessary. */ - -#ifdef REGISTER_CONVERTIBLE - if (REGISTER_CONVERTIBLE (regnum)) - { - REGISTER_CONVERT_TO_VIRTUAL (regnum, REGISTER_VIRTUAL_TYPE (regnum), - raw_buffer, VALUE_CONTENTS_RAW (reg_val)); - } - else -#endif - if (REGISTER_RAW_SIZE (regnum) == REGISTER_VIRTUAL_SIZE (regnum)) - memcpy (VALUE_CONTENTS_RAW (reg_val), raw_buffer, - REGISTER_RAW_SIZE (regnum)); - else - fatal ("Register \"%s\" (%d) has conflicting raw (%d) and virtual (%d) size", - REGISTER_NAME (regnum), regnum, - REGISTER_RAW_SIZE (regnum), REGISTER_VIRTUAL_SIZE (regnum)); - VALUE_LVAL (reg_val) = lval; - VALUE_ADDRESS (reg_val) = addr; - VALUE_REGNO (reg_val) = 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 of the registers in target byte order. - We allocate some extra slop since we do a lot of memcpy's around - `registers', and failing-soft is better than failing hard. */ - -char registers[REGISTER_BYTES + /* SLOP */ 256]; - -/* Nonzero if that register has been fetched, - -1 if register value not available. */ -SIGNED char register_valid[NUM_REGS]; - -/* 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 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. It would also - be good to have a write_register_gen for similar reasons. - - 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; - int startin, endin; - - 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); - - startin = regstart >= inregbyte && regstart < inregend; - endin = regend > inregbyte && regend <= inregend; - - if (!startin && !endin) - 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); - - if (regno == PC_REGNUM && pc_changed_hook) - pc_changed_hook (); -} - -/* 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; - int startin, endin; - char regbuf[MAX_REGISTER_RAW_SIZE]; - - regstart = REGISTER_BYTE (regno); - regend = regstart + REGISTER_RAW_SIZE (regno); - - startin = regstart >= myregstart && regstart < myregend; - endin = regend > myregstart && regend <= myregend; - - if (!startin && !endin) - continue; /* Register is completely out of range */ - - if (startin && endin) /* register is completely in range */ - { - write_register_gen (regno, myaddr + (regstart - myregstart)); - continue; - } - - /* 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); - - if (startin) - memcpy (registers + regstart, - myaddr + regstart - myregstart, - myregend - regstart); - else /* endin */ - memcpy (registers + myregstart, - myaddr, - regend - myregstart); - 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 extract_address (®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. */ - -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; - LONGEST 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. */ - -CORE_ADDR -read_pc_pid (pid) - int pid; -{ -#ifdef TARGET_READ_PC - return TARGET_READ_PC (pid); -#else - return ADDR_BITS_REMOVE ((CORE_ADDR) read_register_pid (PC_REGNUM, pid)); -#endif -} - -CORE_ADDR -read_pc () -{ - return read_pc_pid (inferior_pid); -} - -void -write_pc_pid (pc, pid) - CORE_ADDR pc; - int pid; -{ -#ifdef TARGET_WRITE_PC - TARGET_WRITE_PC (pc, pid); -#else - write_register_pid (PC_REGNUM, pc, pid); -#ifdef NPC_REGNUM - write_register_pid (NPC_REGNUM, pc + 4, pid); -#ifdef NNPC_REGNUM - write_register_pid (NNPC_REGNUM, pc + 8, pid); -#endif -#endif -#endif -} - -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 */ - -CORE_ADDR -read_sp () -{ -#ifdef TARGET_READ_SP - return TARGET_READ_SP (); -#else - return read_register (SP_REGNUM); -#endif -} - -void -write_sp (val) - CORE_ADDR val; -{ -#ifdef TARGET_WRITE_SP - TARGET_WRITE_SP (val); -#else - write_register (SP_REGNUM, val); -#endif -} - -CORE_ADDR -read_fp () -{ -#ifdef TARGET_READ_FP - return TARGET_READ_FP (); -#else - return read_register (FP_REGNUM); -#endif -} - -void -write_fp (val) - CORE_ADDR val; -{ -#ifdef TARGET_WRITE_FP - TARGET_WRITE_FP (val); -#else - write_register (FP_REGNUM, val); -#endif -} - -/* 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; -{ - switch (SYMBOL_CLASS (sym)) - { - /* All cases listed explicitly so that gcc -Wall will detect it if - we failed to consider one. */ - case LOC_REGISTER: - case LOC_ARG: - case LOC_REF_ARG: - case LOC_REGPARM: - case LOC_REGPARM_ADDR: - case LOC_LOCAL: - case LOC_LOCAL_ARG: - case LOC_BASEREG: - case LOC_BASEREG_ARG: - return 1; - - case LOC_UNDEF: - case LOC_CONST: - case LOC_STATIC: - case LOC_TYPEDEF: - - case LOC_LABEL: - /* Getting the address of a label can be done independently of the block, - even if some *uses* of that address wouldn't work so well without - the right frame. */ - - case LOC_BLOCK: - case LOC_CONST_BYTES: - case LOC_UNRESOLVED: - case LOC_OPTIMIZED_OUT: - return 0; - } - return 1; -} - -/* Given a struct symbol for a variable, - and a stack frame id, read the value of the variable - and return a (pointer to a) struct value containing the value. - 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; -{ - register value_ptr v; - struct type *type = SYMBOL_TYPE (var); - CORE_ADDR addr; - register int len; - - v = allocate_value (type); - VALUE_LVAL (v) = lval_memory; /* The most likely possibility. */ - VALUE_BFD_SECTION (v) = SYMBOL_BFD_SECTION (var); - - len = TYPE_LENGTH (type); - - if (frame == NULL) frame = selected_frame; - - switch (SYMBOL_CLASS (var)) - { - case LOC_CONST: - /* Put the constant back in target format. */ - store_signed_integer (VALUE_CONTENTS_RAW (v), len, - (LONGEST) SYMBOL_VALUE (var)); - VALUE_LVAL (v) = not_lval; - return v; - - case LOC_LABEL: - /* Put the constant back in target format. */ - if (overlay_debugging) - store_address (VALUE_CONTENTS_RAW (v), len, - symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var), - SYMBOL_BFD_SECTION (var))); - else - store_address (VALUE_CONTENTS_RAW (v), len, - SYMBOL_VALUE_ADDRESS (var)); - VALUE_LVAL (v) = not_lval; - return v; - - case LOC_CONST_BYTES: - { - char *bytes_addr; - bytes_addr = SYMBOL_VALUE_BYTES (var); - memcpy (VALUE_CONTENTS_RAW (v), bytes_addr, len); - VALUE_LVAL (v) = not_lval; - return v; - } - - case LOC_STATIC: - if (overlay_debugging) - addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var), - SYMBOL_BFD_SECTION (var)); - else - addr = SYMBOL_VALUE_ADDRESS (var); - break; - - case LOC_ARG: - if (frame == NULL) - return 0; - addr = FRAME_ARGS_ADDRESS (frame); - if (!addr) - return 0; - addr += SYMBOL_VALUE (var); - 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; - - case LOC_LOCAL: - case LOC_LOCAL_ARG: - if (frame == NULL) - return 0; - addr = FRAME_LOCALS_ADDRESS (frame); - addr += SYMBOL_VALUE (var); - break; - - 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_TYPEDEF: - error ("Cannot look up value of a typedef"); - break; - - case LOC_BLOCK: - if (overlay_debugging) - VALUE_ADDRESS (v) = symbol_overlayed_address - (BLOCK_START (SYMBOL_BLOCK_VALUE (var)), SYMBOL_BFD_SECTION (var)); - else - VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (var)); - return v; - - case LOC_REGISTER: - case LOC_REGPARM: - case LOC_REGPARM_ADDR: - { - struct block *b; - int regno = SYMBOL_VALUE (var); - value_ptr regval; - - if (frame == NULL) - return 0; - b = get_frame_block (frame); - - if (SYMBOL_CLASS (var) == LOC_REGPARM_ADDR) - { - regval = value_from_register (lookup_pointer_type (type), - regno, - frame); - - if (regval == NULL) - error ("Value of register variable not available."); - - addr = value_as_pointer (regval); - VALUE_LVAL (v) = lval_memory; - } - else - { - regval = value_from_register (type, regno, frame); - - if (regval == NULL) - error ("Value of register variable not available."); - return regval; - } - } - break; - - case LOC_UNRESOLVED: - { - struct minimal_symbol *msym; - - msym = lookup_minimal_symbol (SYMBOL_NAME (var), NULL, NULL); - if (msym == NULL) - return 0; - if (overlay_debugging) - addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (msym), - SYMBOL_BFD_SECTION (msym)); - else - addr = SYMBOL_VALUE_ADDRESS (msym); - } - break; - - case LOC_OPTIMIZED_OUT: - VALUE_LVAL (v) = not_lval; - VALUE_OPTIMIZED_OUT (v) = 1; - return v; - - default: - error ("Cannot look up value of a botched symbol."); - break; - } - - VALUE_ADDRESS (v) = addr; - VALUE_LAZY (v) = 1; - return v; -} - -/* Return a value of type TYPE, stored in register REGNUM, in 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; -{ - char raw_buffer [MAX_REGISTER_RAW_SIZE]; - CORE_ADDR addr; - int optim; - value_ptr v = allocate_value (type); - char *value_bytes = 0; - int value_bytes_copied = 0; - int num_storage_locs; - enum lval_type lval; - int len; - - CHECK_TYPEDEF (type); - len = TYPE_LENGTH (type); - - VALUE_REGNO (v) = regnum; - - num_storage_locs = (len > REGISTER_VIRTUAL_SIZE (regnum) ? - ((len - 1) / REGISTER_RAW_SIZE (regnum)) + 1 : - 1); - - if (num_storage_locs > 1 -#ifdef GDB_TARGET_IS_H8500 - || TYPE_CODE (type) == TYPE_CODE_PTR -#endif - ) - { - /* Value spread across multiple storage locations. */ - - int local_regnum; - int mem_stor = 0, reg_stor = 0; - int mem_tracking = 1; - CORE_ADDR last_addr = 0; - CORE_ADDR first_addr = 0; - - value_bytes = (char *) alloca (len + MAX_REGISTER_RAW_SIZE); - - /* Copy all of the data out, whereever it may be. */ - -#ifdef GDB_TARGET_IS_H8500 -/* This piece of hideosity is required because the H8500 treats registers - differently depending upon whether they are used as pointers or not. As a - pointer, a register needs to have a page register tacked onto the front. - An alternate way to do this would be to have gcc output different register - numbers for the pointer & non-pointer form of the register. But, it - doesn't, so we're stuck with this. */ - - if (TYPE_CODE (type) == TYPE_CODE_PTR - && len > 2) - { - int page_regnum; - - switch (regnum) - { - case R0_REGNUM: case R1_REGNUM: case R2_REGNUM: case R3_REGNUM: - page_regnum = SEG_D_REGNUM; - break; - case R4_REGNUM: case R5_REGNUM: - page_regnum = SEG_E_REGNUM; - break; - case R6_REGNUM: case R7_REGNUM: - page_regnum = SEG_T_REGNUM; - break; - } - - value_bytes[0] = 0; - get_saved_register (value_bytes + 1, - &optim, - &addr, - frame, - page_regnum, - &lval); - - if (register_valid[page_regnum] == -1) - return NULL; /* register value not available */ - - if (lval == lval_register) - reg_stor++; - else - mem_stor++; - first_addr = addr; - last_addr = addr; - - get_saved_register (value_bytes + 2, - &optim, - &addr, - frame, - regnum, - &lval); - - if (register_valid[regnum] == -1) - return NULL; /* register value not available */ - - if (lval == lval_register) - reg_stor++; - else - { - mem_stor++; - mem_tracking = mem_tracking && (addr == last_addr); - } - last_addr = addr; - } - else -#endif /* GDB_TARGET_IS_H8500 */ - for (local_regnum = regnum; - value_bytes_copied < len; - (value_bytes_copied += REGISTER_RAW_SIZE (local_regnum), - ++local_regnum)) - { - get_saved_register (value_bytes + value_bytes_copied, - &optim, - &addr, - frame, - local_regnum, - &lval); - - if (register_valid[local_regnum] == -1) - return NULL; /* register value not available */ - - if (regnum == local_regnum) - first_addr = addr; - if (lval == lval_register) - reg_stor++; - else - { - mem_stor++; - - mem_tracking = - (mem_tracking - && (regnum == local_regnum - || addr == last_addr)); - } - last_addr = addr; - } - - if ((reg_stor && mem_stor) - || (mem_stor && !mem_tracking)) - /* Mixed storage; all of the hassle we just went through was - for some good purpose. */ - { - VALUE_LVAL (v) = lval_reg_frame_relative; - VALUE_FRAME (v) = FRAME_FP (frame); - VALUE_FRAME_REGNUM (v) = regnum; - } - else if (mem_stor) - { - VALUE_LVAL (v) = lval_memory; - VALUE_ADDRESS (v) = first_addr; - } - else if (reg_stor) - { - VALUE_LVAL (v) = lval_register; - VALUE_ADDRESS (v) = first_addr; - } - else - fatal ("value_from_register: Value not stored anywhere!"); - - VALUE_OPTIMIZED_OUT (v) = optim; - - /* Any structure stored in more than one register will always be - an integral number of registers. Otherwise, you'd need to do - some fiddling with the last register copied here for little - endian machines. */ - - /* Copy into the contents section of the value. */ - memcpy (VALUE_CONTENTS_RAW (v), value_bytes, len); - - /* Finally do any conversion necessary when extracting this - type from more than one register. */ -#ifdef REGISTER_CONVERT_TO_TYPE - REGISTER_CONVERT_TO_TYPE(regnum, type, VALUE_CONTENTS_RAW(v)); -#endif - return v; - } - - /* Data is completely contained within a single register. Locate the - register's contents in a real register or in core; - read the data in raw format. */ - - get_saved_register (raw_buffer, &optim, &addr, frame, regnum, &lval); - - if (register_valid[regnum] == -1) - return NULL; /* register value not available */ - - VALUE_OPTIMIZED_OUT (v) = optim; - VALUE_LVAL (v) = lval; - VALUE_ADDRESS (v) = addr; - - /* Convert raw data to virtual format if necessary. */ - -#ifdef REGISTER_CONVERTIBLE - if (REGISTER_CONVERTIBLE (regnum)) - { - REGISTER_CONVERT_TO_VIRTUAL (regnum, type, - raw_buffer, VALUE_CONTENTS_RAW (v)); - } - else -#endif - { - /* Raw and virtual formats are the same for this register. */ - - if (TARGET_BYTE_ORDER == BIG_ENDIAN && len < REGISTER_RAW_SIZE (regnum)) - { - /* Big-endian, and we want less than full size. */ - VALUE_OFFSET (v) = REGISTER_RAW_SIZE (regnum) - len; - } - - memcpy (VALUE_CONTENTS_RAW (v), raw_buffer + VALUE_OFFSET (v), len); - } - - return v; -} - -/* Given a struct symbol for a variable or function, - and a stack frame id, - 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; -{ - CORE_ADDR addr = 0; - struct type *type = SYMBOL_TYPE (var); - value_ptr lazy_value; - - /* Evaluate it first; if the result is a memory address, we're fine. - Lazy evaluation pays off here. */ - - lazy_value = read_var_value (var, frame); - if (lazy_value == 0) - error ("Address of \"%s\" is unknown.", SYMBOL_SOURCE_NAME (var)); - - if (VALUE_LAZY (lazy_value) - || TYPE_CODE (type) == TYPE_CODE_FUNC) - { - value_ptr val; - - addr = VALUE_ADDRESS (lazy_value); - val = value_from_longest (lookup_pointer_type (type), (LONGEST) addr); - VALUE_BFD_SECTION (val) = VALUE_BFD_SECTION (lazy_value); - return val; - } - - /* Not a memory address; check what the problem was. */ - switch (VALUE_LVAL (lazy_value)) - { - case lval_register: - case lval_reg_frame_relative: - error ("Address requested for identifier \"%s\" which is in a register.", - SYMBOL_SOURCE_NAME (var)); - break; - - default: - error ("Can't take address of \"%s\" which isn't an lvalue.", - SYMBOL_SOURCE_NAME (var)); - break; - } - return 0; /* For lint -- never reached */ -} |