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336d1bba0a
* frame-base.h (frame_base_p_ftype): Delete definition. (frame_base_append_predicate): Delete declaration. * frame-unwind.h (frame_unwind_p_ftype): Delete definition. (frame_unwind_append_predicate): Delete declaration. * frame-unwind.c (struct frame_unwind_table): Delete field "p". (append_predicate): Delete parameter "p". (frame_unwind_append_predicate): Delete function. (frame_unwind_append_sniffer): Update call to append_predicate. (frame_unwind_free): Delete function. (_initialize_frame_unwind): Pass NULL as "free" to register_gdbarch_data. (frame_unwind_init): Append the dummy_frame_sniffer. (frame_unwind_find_by_frame): Simplify. * frame-base.c (struct frame_base_table): Delete field "p". (append_predicate): Delete parameter "p". (frame_base_append_predicate): Delete function. (frame_base_append_sniffer): Update call to append_predicate. (frame_base_free): Delete function. (frame_base_find_by_frame): Simplify. (_initialize_frame_base): Pass NULL as "free" to register_gdbarch_data. * x86-64-tdep.c (x86_64_frame_sniffer): Replace "x86_64_frame_p". (x86_64_sigtramp_frame_sniffer): Replace "x86_64_sigtramp_frame_p". (x86_64_init_abi): Set the frame unwind sniffers. * m68k-tdep.c (m68k_frame_sniffer): Replace "m68k_frame_p". (m68k_sigtramp_frame_sniffer): Replace "m68k_sigtramp_frame_p" (m68k_gdbarch_init): Set the frame unwind sniffers. * i386-tdep.c (i386_sigtramp_frame_sniffer): Replace "i386_sigtramp_frame_p". (i386_frame_sniffer): Replace "i386_frame_p". (i386_gdbarch_init): Set the frame unwind sniffers. * avr-tdep.c (avr_frame_sniffer): Replace "avr_frame_sniffer". (avr_gdbarch_init): Set the frame unwind sniffers. * alpha-tdep.c (alpha_sigtramp_frame_sniffer): Replace "alpha_sigtramp_frame_p" (alpha_heuristic_frame_sniffer): Replace "alpha_heuristic_frame_p". (alpha_gdbarch_init): Set the frame unwind sniffers. (alpha_dwarf2_init_abi): Ditto. * alpha-mdebug-tdep.c (alpha_mdebug_frame_sniffer): Replace "alpha_debug_frame_p". (alpha_mdebug_frame_base_sniffer): Replace "alpha_mdebug_frame_base_p". (alpha_mdebug_init_abi): Set the frame unwind sniffers. * d10v-tdep.c (d10v_frame_sniffer): Replace "d10v_frame_p". (d10v_gdbarch_init): Set the frame unwind sniffer. * dwarf2-frame.c (dwarf2_frame_sniffer): Replace "dwarf2_frame_p". (dwarf2_frame_base_sniffer): Replace "dwarf2_frame_base_p". * dwarf2-frame.h (dwarf2_frame_sniffer): Replace "dwarf2_frame_p". (dwarf2_frame_base_sniffer): Replace "dwarf2_frame_base_p". * dummy-frame.c (dummy_frame_sniffer): Replace "dummy_frame_p". * dummy-frame.h (dummy_frame_sniffer): Replace "dummy_frame_p".
387 lines
12 KiB
C
387 lines
12 KiB
C
/* Target-dependent mdebug code for the ALPHA architecture.
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Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
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Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "frame.h"
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#include "frame-unwind.h"
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#include "frame-base.h"
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#include "symtab.h"
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#include "gdbcore.h"
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#include "block.h"
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#include "gdb_assert.h"
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#include "alpha-tdep.h"
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/* FIXME: Some of this code should perhaps be merged with mips. */
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/* *INDENT-OFF* */
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/* Layout of a stack frame on the alpha:
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pdr members: | 7th ... nth arg, |
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| `pushed' by caller. |
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----------------|-------------------------------|<-- old_sp == vfp
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^ ^ ^ ^ | |
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| | | | | |
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| |localoff | Copies of 1st .. 6th |
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| | | | | argument if necessary. |
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| | | v | |
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| | | --- |-------------------------------|<-- LOCALS_ADDRESS
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| | | | |
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| | | | Locals and temporaries. |
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| | | | |
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| | | |-------------------------------|
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| | | | |
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|-fregoffset | Saved float registers. |
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| | | | F9 |
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| | | | . |
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| | | | . |
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| | | | F2 |
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| | v | |
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| | -------|-------------------------------|
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| | | |
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| | | Saved registers. |
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| | | S6 |
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|-regoffset | . |
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| | | . |
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| | | S0 |
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| | | pdr.pcreg |
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| v | |
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| ----------|-------------------------------|
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| | |
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frameoffset | Argument build area, gets |
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| | 7th ... nth arg for any |
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| | called procedure. |
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v | |
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-------------|-------------------------------|<-- sp
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*/
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/* *INDENT-ON* */
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#define PROC_LOW_ADDR(proc) ((proc)->pdr.adr)
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#define PROC_FRAME_OFFSET(proc) ((proc)->pdr.frameoffset)
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#define PROC_FRAME_REG(proc) ((proc)->pdr.framereg)
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#define PROC_REG_MASK(proc) ((proc)->pdr.regmask)
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#define PROC_FREG_MASK(proc) ((proc)->pdr.fregmask)
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#define PROC_REG_OFFSET(proc) ((proc)->pdr.regoffset)
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#define PROC_FREG_OFFSET(proc) ((proc)->pdr.fregoffset)
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#define PROC_PC_REG(proc) ((proc)->pdr.pcreg)
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#define PROC_LOCALOFF(proc) ((proc)->pdr.localoff)
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/* Locate the mdebug PDR for the given PC. Return null if one can't
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be found; you'll have to fall back to other methods in that case. */
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static alpha_extra_func_info_t
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find_proc_desc (CORE_ADDR pc)
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{
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struct block *b = block_for_pc (pc);
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alpha_extra_func_info_t proc_desc = NULL;
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struct symbol *sym = NULL;
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if (b)
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{
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CORE_ADDR startaddr;
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find_pc_partial_function (pc, NULL, &startaddr, NULL);
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if (startaddr > BLOCK_START (b))
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/* This is the "pathological" case referred to in a comment in
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print_frame_info. It might be better to move this check into
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symbol reading. */
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sym = NULL;
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else
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sym = lookup_symbol (MIPS_EFI_SYMBOL_NAME, b, LABEL_DOMAIN, 0, NULL);
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}
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if (sym)
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{
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proc_desc = (alpha_extra_func_info_t) SYMBOL_VALUE (sym);
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/* If we never found a PDR for this function in symbol reading,
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then examine prologues to find the information. */
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if (proc_desc->pdr.framereg == -1)
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proc_desc = NULL;
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}
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return proc_desc;
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}
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/* This returns the PC of the first inst after the prologue. If we can't
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find the prologue, then return 0. */
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static CORE_ADDR
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alpha_mdebug_after_prologue (CORE_ADDR pc, alpha_extra_func_info_t proc_desc)
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{
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if (proc_desc)
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{
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/* If function is frameless, then we need to do it the hard way. I
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strongly suspect that frameless always means prologueless... */
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if (PROC_FRAME_REG (proc_desc) == ALPHA_SP_REGNUM
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&& PROC_FRAME_OFFSET (proc_desc) == 0)
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return 0;
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}
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return alpha_after_prologue (pc);
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}
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/* Return non-zero if we *might* be in a function prologue. Return zero
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if we are definitively *not* in a function prologue. */
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static int
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alpha_mdebug_in_prologue (CORE_ADDR pc, alpha_extra_func_info_t proc_desc)
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{
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CORE_ADDR after_prologue_pc = alpha_mdebug_after_prologue (pc, proc_desc);
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return (after_prologue_pc == 0 || pc < after_prologue_pc);
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}
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/* Frame unwinder that reads mdebug PDRs. */
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struct alpha_mdebug_unwind_cache
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{
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alpha_extra_func_info_t proc_desc;
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CORE_ADDR vfp;
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CORE_ADDR *saved_regs;
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};
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/* Extract all of the information about the frame from PROC_DESC
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and store the resulting register save locations in the structure. */
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static struct alpha_mdebug_unwind_cache *
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alpha_mdebug_frame_unwind_cache (struct frame_info *next_frame,
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void **this_prologue_cache)
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{
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struct alpha_mdebug_unwind_cache *info;
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alpha_extra_func_info_t proc_desc;
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ULONGEST vfp;
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CORE_ADDR pc, reg_position;
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unsigned long mask;
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int ireg, returnreg;
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if (*this_prologue_cache)
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return *this_prologue_cache;
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info = FRAME_OBSTACK_ZALLOC (struct alpha_mdebug_unwind_cache);
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*this_prologue_cache = info;
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pc = frame_pc_unwind (next_frame);
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/* ??? We don't seem to be able to cache the lookup of the PDR
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from alpha_mdebug_frame_p. It'd be nice if we could change
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the arguments to that function. Oh well. */
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proc_desc = find_proc_desc (pc);
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info->proc_desc = proc_desc;
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gdb_assert (proc_desc != NULL);
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info->saved_regs = frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS);
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/* The VFP of the frame is at FRAME_REG+FRAME_OFFSET. */
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frame_unwind_unsigned_register (next_frame, PROC_FRAME_REG (proc_desc), &vfp);
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vfp += PROC_FRAME_OFFSET (info->proc_desc);
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info->vfp = vfp;
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/* Fill in the offsets for the registers which gen_mask says were saved. */
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reg_position = vfp + PROC_REG_OFFSET (proc_desc);
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mask = PROC_REG_MASK (proc_desc);
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returnreg = PROC_PC_REG (proc_desc);
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/* Note that RA is always saved first, regardless of its actual
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register number. */
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if (mask & (1 << returnreg))
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{
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/* Clear bit for RA so we don't save it again later. */
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mask &= ~(1 << returnreg);
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info->saved_regs[returnreg] = reg_position;
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reg_position += 8;
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}
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for (ireg = 0; ireg <= 31; ++ireg)
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if (mask & (1 << ireg))
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{
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info->saved_regs[ireg] = reg_position;
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reg_position += 8;
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}
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reg_position = vfp + PROC_FREG_OFFSET (proc_desc);
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mask = PROC_FREG_MASK (proc_desc);
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for (ireg = 0; ireg <= 31; ++ireg)
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if (mask & (1 << ireg))
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{
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info->saved_regs[ALPHA_FP0_REGNUM + ireg] = reg_position;
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reg_position += 8;
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}
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return info;
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}
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/* Given a GDB frame, determine the address of the calling function's
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frame. This will be used to create a new GDB frame struct. */
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static void
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alpha_mdebug_frame_this_id (struct frame_info *next_frame,
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void **this_prologue_cache,
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struct frame_id *this_id)
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{
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struct alpha_mdebug_unwind_cache *info
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= alpha_mdebug_frame_unwind_cache (next_frame, this_prologue_cache);
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*this_id = frame_id_build (info->vfp, frame_func_unwind (next_frame));
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}
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/* Retrieve the value of REGNUM in FRAME. Don't give up! */
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static void
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alpha_mdebug_frame_prev_register (struct frame_info *next_frame,
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void **this_prologue_cache,
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int regnum, int *optimizedp,
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enum lval_type *lvalp, CORE_ADDR *addrp,
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int *realnump, void *bufferp)
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{
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struct alpha_mdebug_unwind_cache *info
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= alpha_mdebug_frame_unwind_cache (next_frame, this_prologue_cache);
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/* The PC of the previous frame is stored in the link register of
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the current frame. Frob regnum so that we pull the value from
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the correct place. */
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if (regnum == ALPHA_PC_REGNUM)
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regnum = PROC_PC_REG (info->proc_desc);
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/* For all registers known to be saved in the current frame,
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do the obvious and pull the value out. */
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if (info->saved_regs[regnum])
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{
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*optimizedp = 0;
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*lvalp = lval_memory;
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*addrp = info->saved_regs[regnum];
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*realnump = -1;
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if (bufferp != NULL)
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get_frame_memory (next_frame, *addrp, bufferp, ALPHA_REGISTER_SIZE);
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return;
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}
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/* The stack pointer of the previous frame is computed by popping
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the current stack frame. */
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if (regnum == ALPHA_SP_REGNUM)
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{
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*optimizedp = 0;
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*lvalp = not_lval;
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*addrp = 0;
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*realnump = -1;
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if (bufferp != NULL)
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store_unsigned_integer (bufferp, ALPHA_REGISTER_SIZE, info->vfp);
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return;
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}
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/* Otherwise assume the next frame has the same register value. */
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frame_register (next_frame, regnum, optimizedp, lvalp, addrp,
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realnump, bufferp);
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}
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static const struct frame_unwind alpha_mdebug_frame_unwind = {
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NORMAL_FRAME,
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alpha_mdebug_frame_this_id,
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alpha_mdebug_frame_prev_register
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};
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const struct frame_unwind *
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alpha_mdebug_frame_sniffer (struct frame_info *next_frame)
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{
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CORE_ADDR pc = frame_pc_unwind (next_frame);
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alpha_extra_func_info_t proc_desc;
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/* If this PC does not map to a PDR, then clearly this isn't an
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mdebug frame. */
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proc_desc = find_proc_desc (pc);
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if (proc_desc == NULL)
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return NULL;
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/* If we're in the prologue, the PDR for this frame is not yet valid.
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Say no here and we'll fall back on the heuristic unwinder. */
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if (alpha_mdebug_in_prologue (pc, proc_desc))
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return NULL;
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return &alpha_mdebug_frame_unwind;
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}
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static CORE_ADDR
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alpha_mdebug_frame_base_address (struct frame_info *next_frame,
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void **this_prologue_cache)
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{
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struct alpha_mdebug_unwind_cache *info
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= alpha_mdebug_frame_unwind_cache (next_frame, this_prologue_cache);
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return info->vfp;
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}
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static CORE_ADDR
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alpha_mdebug_frame_locals_address (struct frame_info *next_frame,
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void **this_prologue_cache)
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{
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struct alpha_mdebug_unwind_cache *info
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= alpha_mdebug_frame_unwind_cache (next_frame, this_prologue_cache);
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return info->vfp - PROC_LOCALOFF (info->proc_desc);
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}
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static CORE_ADDR
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alpha_mdebug_frame_args_address (struct frame_info *next_frame,
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void **this_prologue_cache)
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{
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struct alpha_mdebug_unwind_cache *info
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= alpha_mdebug_frame_unwind_cache (next_frame, this_prologue_cache);
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return info->vfp - ALPHA_NUM_ARG_REGS * 8;
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}
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static const struct frame_base alpha_mdebug_frame_base = {
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&alpha_mdebug_frame_unwind,
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alpha_mdebug_frame_base_address,
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alpha_mdebug_frame_locals_address,
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alpha_mdebug_frame_args_address
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};
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static const struct frame_base *
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alpha_mdebug_frame_base_sniffer (struct frame_info *next_frame)
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{
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CORE_ADDR pc = frame_pc_unwind (next_frame);
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alpha_extra_func_info_t proc_desc;
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/* If this PC does not map to a PDR, then clearly this isn't an
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mdebug frame. */
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proc_desc = find_proc_desc (pc);
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if (proc_desc == NULL)
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return NULL;
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return &alpha_mdebug_frame_base;
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}
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void
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alpha_mdebug_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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frame_unwind_append_sniffer (gdbarch, alpha_mdebug_frame_sniffer);
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frame_base_append_sniffer (gdbarch, alpha_mdebug_frame_base_sniffer);
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}
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