382 lines
10 KiB
C
382 lines
10 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/param.h>
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#include <sys/proc.h>
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#include <machine/pcb.h>
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#include <machine/frame.h>
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#include <machine/segments.h>
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#include <machine/tss.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 <i386-tdep.h>
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#include "kgdb.h"
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static int ofs_fix;
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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(I386_EBX_REGNUM, (char *)&pcb.pcb_ebx);
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supply_register(I386_ESP_REGNUM, (char *)&pcb.pcb_esp);
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supply_register(I386_EBP_REGNUM, (char *)&pcb.pcb_ebp);
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supply_register(I386_ESI_REGNUM, (char *)&pcb.pcb_esi);
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supply_register(I386_EDI_REGNUM, (char *)&pcb.pcb_edi);
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supply_register(I386_EIP_REGNUM, (char *)&pcb.pcb_eip);
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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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* In revision 1.117 of i386/i386/exception.S trap handlers
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* were changed to pass trapframes by reference rather than
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* by value. Detect this by seeing if the first instruction
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* at the 'calltrap' label is a "push %esp" which has the
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* opcode 0x54.
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*/
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if (kgdb_parse("((char *)calltrap)[0]") == 0x54)
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ofs_fix = 4;
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else
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ofs_fix = 0;
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}
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struct kgdb_tss_cache {
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CORE_ADDR pc;
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CORE_ADDR sp;
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CORE_ADDR tss;
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};
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static int kgdb_trgt_tss_offset[15] = {
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offsetof(struct i386tss, tss_eax),
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offsetof(struct i386tss, tss_ecx),
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offsetof(struct i386tss, tss_edx),
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offsetof(struct i386tss, tss_ebx),
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offsetof(struct i386tss, tss_esp),
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offsetof(struct i386tss, tss_ebp),
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offsetof(struct i386tss, tss_esi),
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offsetof(struct i386tss, tss_edi),
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offsetof(struct i386tss, tss_eip),
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offsetof(struct i386tss, tss_eflags),
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offsetof(struct i386tss, tss_cs),
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offsetof(struct i386tss, tss_ss),
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offsetof(struct i386tss, tss_ds),
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offsetof(struct i386tss, tss_es),
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offsetof(struct i386tss, tss_fs)
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};
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/*
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* If the current thread is executing on a CPU, fetch the common_tss
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* for that CPU.
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*
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* This is painful because 'struct pcpu' is variant sized, so we can't
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* use it. Instead, we lookup the GDT selector for this CPU and
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* extract the base of the TSS from there.
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*/
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static CORE_ADDR
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kgdb_trgt_fetch_tss(void)
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{
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struct kthr *kt;
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struct segment_descriptor sd;
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uintptr_t addr, cpu0prvpage, tss;
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kt = kgdb_thr_lookup_tid(ptid_get_pid(inferior_ptid));
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if (kt == NULL || kt->cpu == NOCPU)
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return (0);
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addr = kgdb_lookup("gdt");
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if (addr == 0)
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return (0);
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addr += (kt->cpu * NGDT + GPROC0_SEL) * sizeof(sd);
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if (kvm_read(kvm, addr, &sd, sizeof(sd)) != sizeof(sd)) {
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warnx("kvm_read: %s", kvm_geterr(kvm));
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return (0);
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}
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if (sd.sd_type != SDT_SYS386BSY) {
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warnx("descriptor is not a busy TSS");
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return (0);
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}
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tss = sd.sd_hibase << 24 | sd.sd_lobase;
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/*
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* In SMP kernels, the TSS is stored as part of the per-CPU
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* data. On older kernels, the CPU0's private page
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* is stored at an address that isn't mapped in minidumps.
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* However, the data is mapped at the alternate cpu0prvpage
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* address. Thus, if the TSS is at the invalid address,
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* change it to be relative to cpu0prvpage instead.
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*/
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if (trunc_page(tss) == 0xffc00000) {
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addr = kgdb_lookup("cpu0prvpage");
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if (addr == 0)
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return (0);
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if (kvm_read(kvm, addr, &cpu0prvpage, sizeof(cpu0prvpage)) !=
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sizeof(cpu0prvpage)) {
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warnx("kvm_read: %s", kvm_geterr(kvm));
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return (0);
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}
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tss = cpu0prvpage + (tss & PAGE_MASK);
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}
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return ((CORE_ADDR)tss);
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}
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static struct kgdb_tss_cache *
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kgdb_trgt_tss_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_tss_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_tss_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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cache->tss = kgdb_trgt_fetch_tss();
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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_dblfault_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_tss_cache *cache;
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cache = kgdb_trgt_tss_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_dblfault_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_tss_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 >= I386_EAX_REGNUM && regnum <= I386_FS_REGNUM)
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? kgdb_trgt_tss_offset[regnum] : -1;
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if (ofs == -1)
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return;
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cache = kgdb_trgt_tss_cache(next_frame, this_cache);
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if (cache->tss == 0)
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return;
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*addrp = cache->tss + 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_dblfault_unwind = {
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UNKNOWN_FRAME,
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&kgdb_trgt_dblfault_this_id,
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&kgdb_trgt_dblfault_prev_register
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};
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struct kgdb_frame_cache {
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int frame_type;
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CORE_ADDR pc;
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CORE_ADDR sp;
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};
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#define FT_NORMAL 1
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#define FT_INTRFRAME 2
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#define FT_INTRTRAPFRAME 3
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#define FT_TIMERFRAME 4
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static int kgdb_trgt_frame_offset[15] = {
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offsetof(struct trapframe, tf_eax),
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offsetof(struct trapframe, tf_ecx),
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offsetof(struct trapframe, tf_edx),
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offsetof(struct trapframe, tf_ebx),
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offsetof(struct trapframe, tf_esp),
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offsetof(struct trapframe, tf_ebp),
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offsetof(struct trapframe, tf_esi),
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offsetof(struct trapframe, tf_edi),
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offsetof(struct trapframe, tf_eip),
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offsetof(struct trapframe, tf_eflags),
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offsetof(struct trapframe, tf_cs),
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offsetof(struct trapframe, tf_ss),
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offsetof(struct trapframe, tf_ds),
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offsetof(struct trapframe, tf_es),
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offsetof(struct trapframe, tf_fs)
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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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char *pname;
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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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find_pc_partial_function(cache->pc, &pname, NULL, NULL);
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if (pname[0] != 'X')
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cache->frame_type = FT_NORMAL;
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else if (strcmp(pname, "Xtimerint") == 0)
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cache->frame_type = FT_TIMERFRAME;
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else if (strcmp(pname, "Xcpustop") == 0 ||
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strcmp(pname, "Xrendezvous") == 0 ||
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strcmp(pname, "Xipi_intr_bitmap_handler") == 0 ||
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strcmp(pname, "Xlazypmap") == 0)
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cache->frame_type = FT_INTRTRAPFRAME;
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else
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cache->frame_type = FT_INTRFRAME;
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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 >= I386_EAX_REGNUM && regnum <= I386_FS_REGNUM)
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? kgdb_trgt_frame_offset[regnum] + ofs_fix : -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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switch (cache->frame_type) {
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case FT_NORMAL:
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break;
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case FT_INTRFRAME:
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ofs += 4;
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break;
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case FT_TIMERFRAME:
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break;
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case FT_INTRTRAPFRAME:
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ofs -= ofs_fix;
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break;
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default:
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fprintf_unfiltered(gdb_stderr, "Correct FT_XXX frame offsets "
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"for %d\n", cache->frame_type);
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break;
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}
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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, "dblfault_handler") == 0)
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return (&kgdb_trgt_dblfault_unwind);
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if (strcmp(pname, "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: %llx =%s\n", __func__, pc, pname); */
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return (NULL);
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}
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