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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [trad-frame.c] - Rev 258
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/* Traditional frame unwind support, for GDB the GNU Debugger. Copyright (C) 2003, 2004, 2007, 2008 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 3 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, see <http://www.gnu.org/licenses/>. */ #include "defs.h" #include "frame.h" #include "trad-frame.h" #include "regcache.h" struct trad_frame_cache { struct frame_info *next_frame; CORE_ADDR this_base; struct trad_frame_saved_reg *prev_regs; struct frame_id this_id; }; struct trad_frame_cache * trad_frame_cache_zalloc (struct frame_info *next_frame) { struct trad_frame_cache *this_trad_cache; this_trad_cache = FRAME_OBSTACK_ZALLOC (struct trad_frame_cache); this_trad_cache->prev_regs = trad_frame_alloc_saved_regs (next_frame); this_trad_cache->next_frame = next_frame; return this_trad_cache; } /* A traditional frame is unwound by analysing the function prologue and using the information gathered to track registers. For non-optimized frames, the technique is reliable (just need to check for all potential instruction sequences). */ struct trad_frame_saved_reg * trad_frame_alloc_saved_regs (struct frame_info *next_frame) { int regnum; struct gdbarch *gdbarch = get_frame_arch (next_frame); int numregs = gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch); struct trad_frame_saved_reg *this_saved_regs = FRAME_OBSTACK_CALLOC (numregs, struct trad_frame_saved_reg); for (regnum = 0; regnum < numregs; regnum++) { this_saved_regs[regnum].realreg = regnum; this_saved_regs[regnum].addr = -1; } return this_saved_regs; } enum { REG_VALUE = -1, REG_UNKNOWN = -2 }; int trad_frame_value_p (struct trad_frame_saved_reg this_saved_regs[], int regnum) { return (this_saved_regs[regnum].realreg == REG_VALUE); } int trad_frame_addr_p (struct trad_frame_saved_reg this_saved_regs[], int regnum) { return (this_saved_regs[regnum].realreg >= 0 && this_saved_regs[regnum].addr != -1); } int trad_frame_realreg_p (struct trad_frame_saved_reg this_saved_regs[], int regnum) { return (this_saved_regs[regnum].realreg >= 0 && this_saved_regs[regnum].addr == -1); } void trad_frame_set_value (struct trad_frame_saved_reg this_saved_regs[], int regnum, LONGEST val) { /* Make the REALREG invalid, indicating that the ADDR contains the register's value. */ this_saved_regs[regnum].realreg = REG_VALUE; this_saved_regs[regnum].addr = val; } void trad_frame_set_reg_value (struct trad_frame_cache *this_trad_cache, int regnum, LONGEST val) { /* External interface for users of trad_frame_cache (who cannot access the prev_regs object directly). */ trad_frame_set_value (this_trad_cache->prev_regs, regnum, val); } void trad_frame_set_reg_realreg (struct trad_frame_cache *this_trad_cache, int regnum, int realreg) { this_trad_cache->prev_regs[regnum].realreg = realreg; this_trad_cache->prev_regs[regnum].addr = -1; } void trad_frame_set_reg_addr (struct trad_frame_cache *this_trad_cache, int regnum, CORE_ADDR addr) { this_trad_cache->prev_regs[regnum].addr = addr; } void trad_frame_set_unknown (struct trad_frame_saved_reg this_saved_regs[], int regnum) { /* Make the REALREG invalid, indicating that the value is not known. */ this_saved_regs[regnum].realreg = REG_UNKNOWN; this_saved_regs[regnum].addr = -1; } void trad_frame_get_prev_register (struct frame_info *next_frame, struct trad_frame_saved_reg this_saved_regs[], int regnum, int *optimizedp, enum lval_type *lvalp, CORE_ADDR *addrp, int *realregp, gdb_byte *bufferp) { struct gdbarch *gdbarch = get_frame_arch (next_frame); if (trad_frame_addr_p (this_saved_regs, regnum)) { /* The register was saved in memory. */ *optimizedp = 0; *lvalp = lval_memory; *addrp = this_saved_regs[regnum].addr; *realregp = -1; if (bufferp != NULL) { /* Read the value in from memory. */ get_frame_memory (next_frame, this_saved_regs[regnum].addr, bufferp, register_size (gdbarch, regnum)); } } else if (trad_frame_realreg_p (this_saved_regs, regnum)) { *optimizedp = 0; *lvalp = lval_register; *addrp = 0; *realregp = this_saved_regs[regnum].realreg; /* Ask the next frame to return the value of the register. */ if (bufferp) frame_unwind_register (next_frame, (*realregp), bufferp); } else if (trad_frame_value_p (this_saved_regs, regnum)) { /* The register's value is available. */ *optimizedp = 0; *lvalp = not_lval; *addrp = 0; *realregp = -1; if (bufferp != NULL) store_unsigned_integer (bufferp, register_size (gdbarch, regnum), this_saved_regs[regnum].addr); } else { error (_("Register %s not available"), gdbarch_register_name (gdbarch, regnum)); } } void trad_frame_get_register (struct trad_frame_cache *this_trad_cache, struct frame_info *next_frame, int regnum, int *optimizedp, enum lval_type *lvalp, CORE_ADDR *addrp, int *realregp, gdb_byte *bufferp) { trad_frame_get_prev_register (next_frame, this_trad_cache->prev_regs, regnum, optimizedp, lvalp, addrp, realregp, bufferp); } void trad_frame_set_id (struct trad_frame_cache *this_trad_cache, struct frame_id this_id) { this_trad_cache->this_id = this_id; } void trad_frame_get_id (struct trad_frame_cache *this_trad_cache, struct frame_id *this_id) { (*this_id) = this_trad_cache->this_id; } void trad_frame_set_this_base (struct trad_frame_cache *this_trad_cache, CORE_ADDR this_base) { this_trad_cache->this_base = this_base; } CORE_ADDR trad_frame_get_this_base (struct trad_frame_cache *this_trad_cache) { return this_trad_cache->this_base; }
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