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Diffstat (limited to 'contrib/gdb/gdb/frame.c')
| -rw-r--r-- | contrib/gdb/gdb/frame.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/contrib/gdb/gdb/frame.c b/contrib/gdb/gdb/frame.c new file mode 100644 index 0000000..ea59eba --- /dev/null +++ b/contrib/gdb/gdb/frame.c @@ -0,0 +1,225 @@ +/* Cache and manage the values of registers for GDB, the GNU debugger. + Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000, 2001 + 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 "frame.h" +#include "target.h" +#include "value.h" +#include "inferior.h" /* for inferior_ptid */ +#include "regcache.h" + +/* FIND_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 (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; +} + +/* DEFAULT_GET_SAVED_REGISTER () + + 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. */ + +static void +default_get_saved_register (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) + target_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 (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); +} + +/* READ_RELATIVE_REGISTER_RAW_BYTES_FOR_FRAME + + 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. */ + +/* FIXME: This function increases the confusion between FP_REGNUM + and the virtual/pseudo-frame pointer. */ + +static int +read_relative_register_raw_bytes_for_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_cached (regnum) < 0) + return 1; /* register value not available */ + + return optim; +} + +/* READ_RELATIVE_REGISTER_RAW_BYTES + + 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 (int regnum, char *myaddr) +{ + return read_relative_register_raw_bytes_for_frame (regnum, myaddr, + selected_frame); +} |
