MIPS arch target kgdb(1) support.
Obtained from: Juniper Networks.
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obrien
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f81754c336
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f8f3b5f095
207
gnu/usr.bin/gdb/kgdb/trgt_mips.c
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207
gnu/usr.bin/gdb/kgdb/trgt_mips.c
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/*
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* Copyright (c) 2004 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* from: src/gnu/usr.bin/gdb/kgdb/trgt_alpha.c,v 1.2.2.1 2005/09/15 05:32:10 marcel
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <machine/asm.h>
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#include <machine/pcb.h>
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#include <machine/frame.h>
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#include <err.h>
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#include <kvm.h>
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#include <string.h>
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#include <defs.h>
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#include <target.h>
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#include <gdbthread.h>
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#include <inferior.h>
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#include <regcache.h>
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#include <frame-unwind.h>
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#include <mips-tdep.h>
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#include "kgdb.h"
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void
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kgdb_trgt_fetch_registers(int regno __unused)
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{
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struct kthr *kt;
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struct pcb pcb;
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kt = kgdb_thr_lookup_tid(ptid_get_tid(inferior_ptid));
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if (kt == NULL)
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return;
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if (kvm_read(kvm, kt->pcb, &pcb, sizeof(pcb)) != sizeof(pcb)) {
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warnx("kvm_read: %s", kvm_geterr(kvm));
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memset(&pcb, 0, sizeof(pcb));
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}
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supply_register(MIPS_S0_REGNUM, (char *)&pcb.pcb_context.val[0]);
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supply_register(MIPS_S1_REGNUM, (char *)&pcb.pcb_context.val[1]);
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supply_register(MIPS_S2_REGNUM, (char *)&pcb.pcb_context.val[2]);
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supply_register(MIPS_S3_REGNUM, (char *)&pcb.pcb_context.val[3]);
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supply_register(MIPS_S4_REGNUM, (char *)&pcb.pcb_context.val[4]);
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supply_register(MIPS_S5_REGNUM, (char *)&pcb.pcb_context.val[5]);
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supply_register(MIPS_S6_REGNUM, (char *)&pcb.pcb_context.val[6]);
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supply_register(MIPS_S7_REGNUM, (char *)&pcb.pcb_context.val[7]);
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supply_register(MIPS_SP_REGNUM, (char *)&pcb.pcb_context.val[8]);
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supply_register(MIPS_SP_REGNUM, (char *)&pcb.pcb_context.val[8]);
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supply_register(MIPS_FP_REGNUM, (char *)&pcb.pcb_context.val[9]);
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supply_register(MIPS_RA_REGNUM, (char *)&pcb.pcb_context.val[10]);
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}
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void
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kgdb_trgt_store_registers(int regno __unused)
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{
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fprintf_unfiltered(gdb_stderr, "XXX: %s\n", __func__);
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}
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struct kgdb_frame_cache {
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CORE_ADDR pc;
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CORE_ADDR sp;
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};
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static int kgdb_trgt_frame_offset[] = {
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offsetof(struct trapframe, zero),
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offsetof(struct trapframe, ast),
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offsetof(struct trapframe, v0),
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offsetof(struct trapframe, v1),
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offsetof(struct trapframe, a0),
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offsetof(struct trapframe, a1),
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offsetof(struct trapframe, a2),
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offsetof(struct trapframe, a3),
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offsetof(struct trapframe, t0),
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offsetof(struct trapframe, t1),
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offsetof(struct trapframe, t2),
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offsetof(struct trapframe, t3),
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offsetof(struct trapframe, t4),
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offsetof(struct trapframe, t5),
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offsetof(struct trapframe, t6),
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offsetof(struct trapframe, t7),
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offsetof(struct trapframe, s0),
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offsetof(struct trapframe, s1),
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offsetof(struct trapframe, s2),
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offsetof(struct trapframe, s3),
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offsetof(struct trapframe, s4),
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offsetof(struct trapframe, s5),
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offsetof(struct trapframe, s6),
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offsetof(struct trapframe, s7),
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offsetof(struct trapframe, t8),
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offsetof(struct trapframe, t9),
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offsetof(struct trapframe, k0),
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offsetof(struct trapframe, k1),
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offsetof(struct trapframe, gp),
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offsetof(struct trapframe, sp),
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offsetof(struct trapframe, s8),
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offsetof(struct trapframe, ra),
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};
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static struct kgdb_frame_cache *
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kgdb_trgt_frame_cache(struct frame_info *next_frame __unused, void **this_cache __unused)
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{
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char buf[MAX_REGISTER_SIZE];
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struct kgdb_frame_cache *cache;
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cache = *this_cache;
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if (cache == NULL) {
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cache = FRAME_OBSTACK_ZALLOC(struct kgdb_frame_cache);
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*this_cache = cache;
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cache->pc = frame_func_unwind(next_frame);
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frame_unwind_register(next_frame, SP_REGNUM, buf);
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cache->sp = extract_unsigned_integer(buf,
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register_size(current_gdbarch, SP_REGNUM));
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}
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return (cache);
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}
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static void
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kgdb_trgt_trapframe_this_id(struct frame_info *next_frame, void **this_cache,
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struct frame_id *this_id)
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{
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struct kgdb_frame_cache *cache;
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cache = kgdb_trgt_frame_cache(next_frame, this_cache);
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*this_id = frame_id_build(cache->sp, cache->pc);
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}
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static void
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kgdb_trgt_trapframe_prev_register(struct frame_info *next_frame __unused,
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void **this_cache __unused, int regnum __unused, int *optimizedp __unused,
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enum lval_type *lvalp __unused, CORE_ADDR *addrp __unused,
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int *realnump __unused, void *valuep __unused)
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{
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char dummy_valuep[MAX_REGISTER_SIZE];
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struct kgdb_frame_cache *cache;
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int ofs, regsz;
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regsz = register_size(current_gdbarch, regnum);
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if (valuep == NULL)
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valuep = dummy_valuep;
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memset(valuep, 0, regsz);
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*optimizedp = 0;
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*addrp = 0;
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*lvalp = not_lval;
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*realnump = -1;
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ofs = (regnum >= 0 && regnum <= MIPS_RA_REGNUM) ?
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kgdb_trgt_frame_offset[regnum] : -1;
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if (ofs == -1)
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return;
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cache = kgdb_trgt_frame_cache(next_frame, this_cache);
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*addrp = cache->sp + ofs * 8;
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*lvalp = lval_memory;
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target_read_memory(*addrp, valuep, regsz);
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}
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static const struct frame_unwind kgdb_trgt_trapframe_unwind = {
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UNKNOWN_FRAME,
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&kgdb_trgt_trapframe_this_id,
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&kgdb_trgt_trapframe_prev_register
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};
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const struct frame_unwind *
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kgdb_trgt_trapframe_sniffer(struct frame_info *next_frame __unused)
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{
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char *pname;
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CORE_ADDR pc;
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pc = frame_pc_unwind(next_frame);
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pname = NULL;
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find_pc_partial_function(pc, &pname, NULL, NULL);
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if (pname == NULL)
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return (NULL);
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if ((strcmp(pname, "MipsKernIntr") == 0) ||
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(strcmp(pname, "MipsKernGenException") == 0) ||
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(strcmp(pname, "MipsUserIntr") == 0) ||
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(strcmp(pname, "MipsUserGenException") == 0))
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return (&kgdb_trgt_trapframe_unwind);
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/* printf("%s: %llx =%s\n", __func__, pc, pname); */
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return (NULL);
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}
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