213 lines
6.0 KiB
C
213 lines
6.0 KiB
C
/*
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.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 <amd64-tdep.h>
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#include "kgdb.h"
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CORE_ADDR
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kgdb_trgt_core_pcb(u_int cpuid)
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{
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return (kgdb_trgt_stop_pcb(cpuid, sizeof(struct pcb)));
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}
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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_pid(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(AMD64_RBX_REGNUM, (char *)&pcb.pcb_rbx);
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supply_register(AMD64_RBP_REGNUM, (char *)&pcb.pcb_rbp);
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supply_register(AMD64_RSP_REGNUM, (char *)&pcb.pcb_rsp);
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supply_register(AMD64_R8_REGNUM + 4, (char *)&pcb.pcb_r12);
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supply_register(AMD64_R8_REGNUM + 5, (char *)&pcb.pcb_r13);
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supply_register(AMD64_R8_REGNUM + 6, (char *)&pcb.pcb_r14);
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supply_register(AMD64_R15_REGNUM, (char *)&pcb.pcb_r15);
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supply_register(AMD64_RIP_REGNUM, (char *)&pcb.pcb_rip);
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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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void
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kgdb_trgt_new_objfile(struct objfile *objfile)
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{
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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[20] = {
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offsetof(struct trapframe, tf_rax),
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offsetof(struct trapframe, tf_rbx),
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offsetof(struct trapframe, tf_rcx),
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offsetof(struct trapframe, tf_rdx),
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offsetof(struct trapframe, tf_rsi),
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offsetof(struct trapframe, tf_rdi),
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offsetof(struct trapframe, tf_rbp),
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offsetof(struct trapframe, tf_rsp),
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offsetof(struct trapframe, tf_r8),
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offsetof(struct trapframe, tf_r9),
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offsetof(struct trapframe, tf_r10),
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offsetof(struct trapframe, tf_r11),
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offsetof(struct trapframe, tf_r12),
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offsetof(struct trapframe, tf_r13),
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offsetof(struct trapframe, tf_r14),
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offsetof(struct trapframe, tf_r15),
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offsetof(struct trapframe, tf_rip),
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offsetof(struct trapframe, tf_rflags),
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offsetof(struct trapframe, tf_cs),
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offsetof(struct trapframe, tf_ss)
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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, void **this_cache)
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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,
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void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp,
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CORE_ADDR *addrp, int *realnump, void *valuep)
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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 >= AMD64_RAX_REGNUM && regnum <= AMD64_EFLAGS_REGNUM + 2)
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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;
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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)
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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, "calltrap") == 0 ||
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strcmp(pname, "fast_syscall_common") == 0 ||
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strcmp(pname, "mchk_calltrap") == 0 ||
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strcmp(pname, "nmi_calltrap") == 0 ||
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(pname[0] == 'X' && pname[1] != '_'))
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return (&kgdb_trgt_trapframe_unwind);
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/* printf("%s: %lx =%s\n", __func__, pc, pname); */
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return (NULL);
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}
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/*
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* This function ensures, that the PC is inside the
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* function section which is understood by GDB.
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*
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* Return 0 when fixup is necessary, -1 otherwise.
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*/
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int
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kgdb_trgt_pc_fixup(CORE_ADDR *pc __unused)
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{
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return (-1);
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}
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