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Initial creation of sourceware repository
This commit is contained in:
Stan Shebs
278
sim/common/sim-break.c
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278
sim/common/sim-break.c
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/* Simulator breakpoint support.
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Copyright (C) 1997 Free Software Foundation, Inc.
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Contributed by Cygnus Support.
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This file is part of GDB, the GNU debugger.
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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, or (at your option)
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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 along
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with this program; if not, write to the Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include <stdio.h>
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#include "sim-main.h"
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#include "sim-assert.h"
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#include "sim-break.h"
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#ifndef SIM_BREAKPOINT
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#define SIM_BREAKPOINT {0x00}
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#define SIM_BREAKPOINT_SIZE (1)
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#endif
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struct
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sim_breakpoint
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{
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struct sim_breakpoint *next;
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SIM_ADDR addr; /* Address of this breakpoint */
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int flags;
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unsigned char loc_contents[SIM_BREAKPOINT_SIZE]; /* Contents of addr while
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BP is enabled */
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};
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#define SIM_BREAK_INSERTED 0x1 /* Breakpoint has been inserted */
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#define SIM_BREAK_DISABLED 0x2 /* Breakpoint is disabled */
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static unsigned char sim_breakpoint [] = SIM_BREAKPOINT;
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static void insert_breakpoint PARAMS ((SIM_DESC sd,
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struct sim_breakpoint *bp));
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static void remove_breakpoint PARAMS ((SIM_DESC sd,
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struct sim_breakpoint *bp));
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static SIM_RC resume_handler PARAMS ((SIM_DESC sd));
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static SIM_RC suspend_handler PARAMS ((SIM_DESC sd));
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/* Do the actual work of inserting a breakpoint into the instruction
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stream. */
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static void
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insert_breakpoint (sd, bp)
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SIM_DESC sd;
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struct sim_breakpoint *bp;
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{
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if (bp->flags & (SIM_BREAK_INSERTED | SIM_BREAK_DISABLED))
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return;
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sim_core_read_buffer (sd, NULL, exec_map, bp->loc_contents,
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bp->addr, SIM_BREAKPOINT_SIZE);
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sim_core_write_buffer (sd, NULL, exec_map, sim_breakpoint,
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bp->addr, SIM_BREAKPOINT_SIZE);
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bp->flags |= SIM_BREAK_INSERTED;
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}
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/* Do the actual work of removing a breakpoint. */
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static void
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remove_breakpoint (sd, bp)
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SIM_DESC sd;
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struct sim_breakpoint *bp;
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{
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if (!(bp->flags & SIM_BREAK_INSERTED))
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return;
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sim_core_write_buffer (sd, NULL, exec_map, bp->loc_contents,
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bp->addr, SIM_BREAKPOINT_SIZE);
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bp->flags &= ~SIM_BREAK_INSERTED;
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}
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/* Come here when a breakpoint insn is hit. If it's really a breakpoint, we
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halt things, and never return. If it's a false hit, we return to let the
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caller handle things. */
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void
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sim_handle_breakpoint (sd, cpu, cia)
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SIM_DESC sd;
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sim_cpu *cpu;
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sim_cia cia;
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{
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struct sim_breakpoint *bp;
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for (bp = STATE_BREAKPOINTS (sd); bp; bp = bp->next)
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if (bp->addr == CIA_ADDR (cia))
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break;
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if (!bp || !(bp->flags & SIM_BREAK_INSERTED))
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return;
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sim_engine_halt (sd, STATE_CPU (sd, 0), NULL, cia, sim_stopped, SIM_SIGTRAP);
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}
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/* Handler functions for simulator resume and suspend events. */
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static SIM_RC
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resume_handler (sd)
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SIM_DESC sd;
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{
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struct sim_breakpoint *bp;
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for (bp = STATE_BREAKPOINTS (sd); bp; bp = bp->next)
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insert_breakpoint (sd, bp);
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return SIM_RC_OK;
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}
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static SIM_RC
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suspend_handler (sd)
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SIM_DESC sd;
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{
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struct sim_breakpoint *bp;
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for (bp = STATE_BREAKPOINTS (sd); bp; bp = bp->next)
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remove_breakpoint (sd, bp);
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return SIM_RC_OK;
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}
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/* Called from simulator module initialization. */
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SIM_RC
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sim_break_install (sd)
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SIM_DESC sd;
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{
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sim_module_add_resume_fn (sd, resume_handler);
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sim_module_add_suspend_fn (sd, suspend_handler);
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return SIM_RC_OK;
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}
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/* Install a breakpoint. This is a user-function. The breakpoint isn't
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actually installed here. We just record it. Resume_handler does the
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actual work.
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*/
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SIM_RC
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sim_set_breakpoint (sd, addr)
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SIM_DESC sd;
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SIM_ADDR addr;
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{
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struct sim_breakpoint *bp;
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for (bp = STATE_BREAKPOINTS (sd); bp; bp = bp->next)
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if (bp->addr == addr)
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return SIM_RC_DUPLICATE_BREAKPOINT; /* Already there */
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else
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break; /* FIXME: why not scan all bp's? */
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bp = ZALLOC (struct sim_breakpoint);
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bp->addr = addr;
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bp->next = STATE_BREAKPOINTS (sd);
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bp->flags = 0;
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STATE_BREAKPOINTS (sd) = bp;
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return SIM_RC_OK;
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}
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/* Delete a breakpoint. All knowlege of the breakpoint is removed from the
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simulator.
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*/
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SIM_RC
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sim_clear_breakpoint (sd, addr)
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SIM_DESC sd;
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SIM_ADDR addr;
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{
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struct sim_breakpoint *bp, *bpprev;
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for (bp = STATE_BREAKPOINTS (sd), bpprev = NULL;
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bp;
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bpprev = bp, bp = bp->next)
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if (bp->addr == addr)
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break;
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if (!bp)
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return SIM_RC_UNKNOWN_BREAKPOINT;
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remove_breakpoint (sd, bp);
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if (bpprev)
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bpprev->next = bp->next;
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else
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STATE_BREAKPOINTS (sd) = NULL;
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zfree (bp);
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return SIM_RC_OK;
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}
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SIM_RC
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sim_clear_all_breakpoints (sd)
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SIM_DESC sd;
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{
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while (STATE_BREAKPOINTS (sd))
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sim_clear_breakpoint (sd, STATE_BREAKPOINTS (sd)->addr);
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return SIM_RC_OK;
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}
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SIM_RC
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sim_enable_breakpoint (sd, addr)
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SIM_DESC sd;
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SIM_ADDR addr;
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{
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struct sim_breakpoint *bp;
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for (bp = STATE_BREAKPOINTS (sd); bp; bp = bp->next)
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if (bp->addr == addr)
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break;
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if (!bp)
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return SIM_RC_UNKNOWN_BREAKPOINT;
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bp->flags &= ~SIM_BREAK_DISABLED;
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return SIM_RC_OK;
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}
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SIM_RC
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sim_disable_breakpoint (sd, addr)
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SIM_DESC sd;
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SIM_ADDR addr;
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{
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struct sim_breakpoint *bp;
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for (bp = STATE_BREAKPOINTS (sd); bp; bp = bp->next)
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if (bp->addr == addr)
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break;
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if (!bp)
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return SIM_RC_UNKNOWN_BREAKPOINT;
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bp->flags |= SIM_BREAK_DISABLED;
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return SIM_RC_OK;
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}
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SIM_RC
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sim_enable_all_breakpoints (sd)
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SIM_DESC sd;
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{
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struct sim_breakpoint *bp;
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for (bp = STATE_BREAKPOINTS (sd); bp; bp = bp->next)
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bp->flags &= ~SIM_BREAK_DISABLED;
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return SIM_RC_OK;
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}
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SIM_RC
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sim_disable_all_breakpoints (sd)
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SIM_DESC sd;
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{
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struct sim_breakpoint *bp;
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for (bp = STATE_BREAKPOINTS (sd); bp; bp = bp->next)
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bp->flags |= SIM_BREAK_DISABLED;
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return SIM_RC_OK;
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}
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