[dragonfly.git] / gnu / usr.bin / gdb / kgdb / trgt_x86_64.c

/*
 * Copyright (c) 2004 Marcel Moolenaar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD: src/gnu/usr.bin/gdb/kgdb/trgt_amd64.c,v 1.10 2008/05/01 20:36:48 jhb Exp $
 */

#include <sys/cdefs.h>

#include <sys/types.h>
#include <sys/thread.h>
#include <machine/pcb.h>
#include <machine/frame.h>
#include <err.h>
#include <kvm.h>
#include <string.h>

#include <defs.h>
#include <target.h>
#include <gdbthread.h>
#include <inferior.h>
#include <regcache.h>
#include <frame-unwind.h>
#include <amd64-tdep.h>

#include "kgdb.h"

static int
kgdb_trgt_trapframe_sniffer(const struct frame_unwind *self,
			    struct frame_info *next_frame,
			    void **this_prologue_cache);

void
kgdb_trgt_fetch_registers(struct target_ops *target_ops, struct regcache *regcache, int regno)
{
	struct kthr *kt;
	struct pcb pcb;

	kt = kgdb_thr_lookup_tid(ptid_get_tid(inferior_ptid));
	if (kt == NULL) {
		regcache_raw_supply(regcache, regno, NULL);
		return;
	}

	/*
	 * kt->pcb == 0 is a marker for "non-dumping kernel thread".
	 */
	if (kt->pcb == 0) {
		uintptr_t regs[7];
		uintptr_t addr;
		uintptr_t sp;

		addr = kt->kaddr + offsetof(struct thread, td_sp);
		kvm_read(kvm, addr, &sp, sizeof(sp));
		/*
		 * Stack is:
		 * -2 ret
		 * -1 popfq
		 * 0 popq %r15	edi
		 * 1 popq %r14
		 * 2 popq %r13
		 * 3 popq %r12
		 * 4 popq %rbx
		 * 5 popq %rbp
		 * 6 ret
		 */
		if (kvm_read(kvm, sp + 2 * sizeof(regs[0]), regs, sizeof(regs)) != sizeof(regs)) {
			warnx("kvm_read: %s", kvm_geterr(kvm));
			memset(regs, 0, sizeof(regs));
		}
		regcache_raw_supply(regcache, AMD64_R8_REGNUM + 7, &regs[0]);
		regcache_raw_supply(regcache, AMD64_R8_REGNUM + 6, &regs[1]);
		regcache_raw_supply(regcache, AMD64_R8_REGNUM + 5, &regs[2]);
		regcache_raw_supply(regcache, AMD64_R8_REGNUM + 4, &regs[3]);
		regcache_raw_supply(regcache, AMD64_RBX_REGNUM, &regs[4]);
		regcache_raw_supply(regcache, AMD64_RBP_REGNUM, &regs[5]);
		regcache_raw_supply(regcache, AMD64_RIP_REGNUM, &regs[6]);
		sp += 9 * sizeof(regs[0]);
		regcache_raw_supply(regcache, AMD64_RSP_REGNUM, &sp);
		return;
	}

	if (kvm_read(kvm, kt->pcb, &pcb, sizeof(pcb)) != sizeof(pcb)) {
		warnx("kvm_read: %s", kvm_geterr(kvm));
		memset(&pcb, 0, sizeof(pcb));
	}

	regcache_raw_supply(regcache, AMD64_RBX_REGNUM, (char *)&pcb.pcb_rbx);
	regcache_raw_supply(regcache, AMD64_RBP_REGNUM, (char *)&pcb.pcb_rbp);
	regcache_raw_supply(regcache, AMD64_RSP_REGNUM, (char *)&pcb.pcb_rsp);
	regcache_raw_supply(regcache, AMD64_R8_REGNUM + 4, (char *)&pcb.pcb_r12);
	regcache_raw_supply(regcache, AMD64_R8_REGNUM + 5, (char *)&pcb.pcb_r13);
	regcache_raw_supply(regcache, AMD64_R8_REGNUM + 6, (char *)&pcb.pcb_r14);
	regcache_raw_supply(regcache, AMD64_R15_REGNUM, (char *)&pcb.pcb_r15);
	regcache_raw_supply(regcache, AMD64_RIP_REGNUM, (char *)&pcb.pcb_rip);
}

struct kgdb_frame_cache {
	CORE_ADDR	pc;
	CORE_ADDR	sp;
};

static int kgdb_trgt_frame_offset[20] = {
	offsetof(struct trapframe, tf_rax),
	offsetof(struct trapframe, tf_rbx),
	offsetof(struct trapframe, tf_rcx),
	offsetof(struct trapframe, tf_rdx),
	offsetof(struct trapframe, tf_rsi),
	offsetof(struct trapframe, tf_rdi),
	offsetof(struct trapframe, tf_rbp),
	offsetof(struct trapframe, tf_rsp),
	offsetof(struct trapframe, tf_r8),
	offsetof(struct trapframe, tf_r9),
	offsetof(struct trapframe, tf_r10),
	offsetof(struct trapframe, tf_r11),
	offsetof(struct trapframe, tf_r12),
	offsetof(struct trapframe, tf_r13),
	offsetof(struct trapframe, tf_r14),
	offsetof(struct trapframe, tf_r15),
	offsetof(struct trapframe, tf_rip),
	offsetof(struct trapframe, tf_rflags),
	offsetof(struct trapframe, tf_cs),
	offsetof(struct trapframe, tf_ss)
};

static struct kgdb_frame_cache *
kgdb_trgt_frame_cache(struct frame_info *next_frame, void **this_cache)
{
	enum bfd_endian byte_order = gdbarch_byte_order(get_frame_arch(next_frame));
	char buf[MAX_REGISTER_SIZE];
	struct kgdb_frame_cache *cache;

	cache = *this_cache;
	if (cache == NULL) {
		cache = FRAME_OBSTACK_ZALLOC(struct kgdb_frame_cache);
		*this_cache = cache;
		cache->pc = get_frame_address_in_block(next_frame);
		frame_unwind_register(next_frame, AMD64_RSP_REGNUM, buf);
		cache->sp = extract_unsigned_integer(buf,
		    register_size(get_frame_arch(next_frame), AMD64_RSP_REGNUM),
		    byte_order);
	}
	return (cache);
}

static void
kgdb_trgt_trapframe_this_id(struct frame_info *next_frame, void **this_cache,
    struct frame_id *this_id)
{
	struct kgdb_frame_cache *cache;

	cache = kgdb_trgt_frame_cache(next_frame, this_cache);
	*this_id = frame_id_build(cache->sp, cache->pc);
}

static struct value *
kgdb_trgt_trapframe_prev_register(struct frame_info *next_frame,
    void **this_cache, int regnum)
{
	CORE_ADDR addrp;
	struct kgdb_frame_cache *cache;
	int ofs;

	if (regnum < AMD64_RAX_REGNUM || regnum > AMD64_EFLAGS_REGNUM + 2)
		return frame_unwind_got_register(next_frame, regnum, regnum);

	ofs = kgdb_trgt_frame_offset[regnum];

	cache = kgdb_trgt_frame_cache(next_frame, this_cache);

	addrp = cache->sp + ofs;
	return frame_unwind_got_memory(next_frame, regnum, addrp);
}

const struct frame_unwind kgdb_trgt_trapframe_unwind = {
        NORMAL_FRAME,
        &kgdb_trgt_trapframe_this_id,
        &kgdb_trgt_trapframe_prev_register,
	.sniffer = kgdb_trgt_trapframe_sniffer
};

static int
kgdb_trgt_trapframe_sniffer(const struct frame_unwind *self,
			    struct frame_info *next_frame,
			    void **this_prologue_cache)
{
	char *pname;
	CORE_ADDR pc;

	pc = get_frame_address_in_block(next_frame);
	pname = NULL;
	find_pc_partial_function(pc, &pname, NULL, NULL);
	if (pname == NULL)
		return (0);
	if (strcmp(pname, "calltrap") == 0 ||
	    strcmp(pname, "dblfault_handler") == 0 ||
	    strcmp(pname, "nmi_calltrap") == 0 ||
	    (pname[0] == 'X' && pname[1] != '_'))
		return (1);
	return (0);
}
Commit	Line	Data
301e0930 SS	1	/*
	2	* Copyright (c) 2004 Marcel Moolenaar
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	*
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	*
	15	* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
	16	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	17	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	18	* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
	19	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	20	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	21	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	22	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	23	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	24	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	25	*
f17ea84b	26	* $FreeBSD: src/gnu/usr.bin/gdb/kgdb/trgt_amd64.c,v 1.10 2008/05/01 20:36:48 jhb Exp $
301e0930 SS	27	*/
	28
	29	#include <sys/cdefs.h>
	30
	31	#include <sys/types.h>
5f9c1196	32	#include <sys/thread.h>
301e0930 SS	33	#include <machine/pcb.h>
	34	#include <machine/frame.h>
	35	#include <err.h>
	36	#include <kvm.h>
	37	#include <string.h>
	38
	39	#include <defs.h>
	40	#include <target.h>
	41	#include <gdbthread.h>
	42	#include <inferior.h>
	43	#include <regcache.h>
	44	#include <frame-unwind.h>
	45	#include <amd64-tdep.h>
	46
	47	#include "kgdb.h"
	48
f17ea84b SS	49	static int
	50	kgdb_trgt_trapframe_sniffer(const struct frame_unwind *self,
	51	struct frame_info *next_frame,
	52	void **this_prologue_cache);
	53
301e0930	54	void
f17ea84b	55	kgdb_trgt_fetch_registers(struct target_ops target_ops, struct regcache regcache, int regno)
301e0930 SS	56	{
	57	struct kthr *kt;
	58	struct pcb pcb;
	59
	60	kt = kgdb_thr_lookup_tid(ptid_get_tid(inferior_ptid));
48d74c1d SS	61	if (kt == NULL) {
48d74c1d SS	62	regcache_raw_supply(regcache, regno, NULL);
301e0930	63	return;
48d74c1d	64	}
5f9c1196 MD	65
	66	/*
	67	* kt->pcb == 0 is a marker for "non-dumping kernel thread".
	68	*/
	69	if (kt->pcb == 0) {
	70	uintptr_t regs[7];
	71	uintptr_t addr;
	72	uintptr_t sp;
	73
	74	addr = kt->kaddr + offsetof(struct thread, td_sp);
	75	kvm_read(kvm, addr, &sp, sizeof(sp));
	76	/*
	77	* Stack is:
	78	* -2 ret
	79	* -1 popfq
	80	* 0 popq %r15 edi
	81	* 1 popq %r14
	82	* 2 popq %r13
	83	* 3 popq %r12
	84	* 4 popq %rbx
	85	* 5 popq %rbp
	86	* 6 ret
	87	*/
	88	if (kvm_read(kvm, sp + 2 * sizeof(regs[0]), regs, sizeof(regs)) != sizeof(regs)) {
	89	warnx("kvm_read: %s", kvm_geterr(kvm));
	90	memset(regs, 0, sizeof(regs));
	91	}
	92	regcache_raw_supply(regcache, AMD64_R8_REGNUM + 7, &regs[0]);
	93	regcache_raw_supply(regcache, AMD64_R8_REGNUM + 6, &regs[1]);
	94	regcache_raw_supply(regcache, AMD64_R8_REGNUM + 5, &regs[2]);
	95	regcache_raw_supply(regcache, AMD64_R8_REGNUM + 4, &regs[3]);
	96	regcache_raw_supply(regcache, AMD64_RBX_REGNUM, &regs[4]);
	97	regcache_raw_supply(regcache, AMD64_RBP_REGNUM, &regs[5]);
	98	regcache_raw_supply(regcache, AMD64_RIP_REGNUM, &regs[6]);
	99	sp += 9 * sizeof(regs[0]);
	100	regcache_raw_supply(regcache, AMD64_RSP_REGNUM, &sp);
	101	return;
	102	}
	103
301e0930 SS	104	if (kvm_read(kvm, kt->pcb, &pcb, sizeof(pcb)) != sizeof(pcb)) {
	105	warnx("kvm_read: %s", kvm_geterr(kvm));
	106	memset(&pcb, 0, sizeof(pcb));
	107	}
	108
48d74c1d SS	109	regcache_raw_supply(regcache, AMD64_RBX_REGNUM, (char *)&pcb.pcb_rbx);
	110	regcache_raw_supply(regcache, AMD64_RBP_REGNUM, (char *)&pcb.pcb_rbp);
	111	regcache_raw_supply(regcache, AMD64_RSP_REGNUM, (char *)&pcb.pcb_rsp);
	112	regcache_raw_supply(regcache, AMD64_R8_REGNUM + 4, (char *)&pcb.pcb_r12);
	113	regcache_raw_supply(regcache, AMD64_R8_REGNUM + 5, (char *)&pcb.pcb_r13);
	114	regcache_raw_supply(regcache, AMD64_R8_REGNUM + 6, (char *)&pcb.pcb_r14);
	115	regcache_raw_supply(regcache, AMD64_R15_REGNUM, (char *)&pcb.pcb_r15);
	116	regcache_raw_supply(regcache, AMD64_RIP_REGNUM, (char *)&pcb.pcb_rip);
301e0930 SS	117	}
301e0930 SS	118
301e0930 SS	119	struct kgdb_frame_cache {
	120	CORE_ADDR pc;
	121	CORE_ADDR sp;
	122	};
	123
	124	static int kgdb_trgt_frame_offset[20] = {
	125	offsetof(struct trapframe, tf_rax),
	126	offsetof(struct trapframe, tf_rbx),
	127	offsetof(struct trapframe, tf_rcx),
	128	offsetof(struct trapframe, tf_rdx),
	129	offsetof(struct trapframe, tf_rsi),
	130	offsetof(struct trapframe, tf_rdi),
	131	offsetof(struct trapframe, tf_rbp),
	132	offsetof(struct trapframe, tf_rsp),
	133	offsetof(struct trapframe, tf_r8),
	134	offsetof(struct trapframe, tf_r9),
	135	offsetof(struct trapframe, tf_r10),
	136	offsetof(struct trapframe, tf_r11),
	137	offsetof(struct trapframe, tf_r12),
	138	offsetof(struct trapframe, tf_r13),
	139	offsetof(struct trapframe, tf_r14),
	140	offsetof(struct trapframe, tf_r15),
	141	offsetof(struct trapframe, tf_rip),
	142	offsetof(struct trapframe, tf_rflags),
	143	offsetof(struct trapframe, tf_cs),
	144	offsetof(struct trapframe, tf_ss)
	145	};
	146
	147	static struct kgdb_frame_cache *
	148	kgdb_trgt_frame_cache(struct frame_info next_frame, void *this_cache)
	149	{
f17ea84b	150	enum bfd_endian byte_order = gdbarch_byte_order(get_frame_arch(next_frame));
301e0930 SS	151	char buf[MAX_REGISTER_SIZE];
	152	struct kgdb_frame_cache *cache;
	153
	154	cache = *this_cache;
	155	if (cache == NULL) {
	156	cache = FRAME_OBSTACK_ZALLOC(struct kgdb_frame_cache);
	157	*this_cache = cache;
48d74c1d SS	158	cache->pc = get_frame_address_in_block(next_frame);
48d74c1d SS	159	frame_unwind_register(next_frame, AMD64_RSP_REGNUM, buf);
301e0930	160	cache->sp = extract_unsigned_integer(buf,
f17ea84b SS	161	register_size(get_frame_arch(next_frame), AMD64_RSP_REGNUM),
f17ea84b SS	162	byte_order);
301e0930 SS	163	}
	164	return (cache);
	165	}
	166
	167	static void
	168	kgdb_trgt_trapframe_this_id(struct frame_info next_frame, void *this_cache,
	169	struct frame_id *this_id)
	170	{
	171	struct kgdb_frame_cache *cache;
	172
	173	cache = kgdb_trgt_frame_cache(next_frame, this_cache);
	174	*this_id = frame_id_build(cache->sp, cache->pc);
	175	}
	176
f17ea84b	177	static struct value *
301e0930	178	kgdb_trgt_trapframe_prev_register(struct frame_info *next_frame,
f17ea84b	179	void **this_cache, int regnum)
301e0930	180	{
f17ea84b	181	CORE_ADDR addrp;
301e0930	182	struct kgdb_frame_cache *cache;
f17ea84b	183	int ofs;
301e0930	184
f17ea84b SS	185	if (regnum < AMD64_RAX_REGNUM \|\| regnum > AMD64_EFLAGS_REGNUM + 2)
f17ea84b SS	186	return frame_unwind_got_register(next_frame, regnum, regnum);
301e0930	187
f17ea84b	188	ofs = kgdb_trgt_frame_offset[regnum];
301e0930 SS	189
301e0930 SS	190	cache = kgdb_trgt_frame_cache(next_frame, this_cache);
301e0930	191
f17ea84b SS	192	addrp = cache->sp + ofs;
f17ea84b SS	193	return frame_unwind_got_memory(next_frame, regnum, addrp);
301e0930 SS	194	}
301e0930 SS	195
f17ea84b SS	196	const struct frame_unwind kgdb_trgt_trapframe_unwind = {
	197	NORMAL_FRAME,
	198	&kgdb_trgt_trapframe_this_id,
	199	&kgdb_trgt_trapframe_prev_register,
	200	.sniffer = kgdb_trgt_trapframe_sniffer
	201	};
	202
	203	static int
3cdd3f79 MD	204	kgdb_trgt_trapframe_sniffer(const struct frame_unwind *self,
	205	struct frame_info *next_frame,
	206	void **this_prologue_cache)
301e0930 SS	207	{
	208	char *pname;
	209	CORE_ADDR pc;
	210
f17ea84b	211	pc = get_frame_address_in_block(next_frame);
301e0930 SS	212	pname = NULL;
	213	find_pc_partial_function(pc, &pname, NULL, NULL);
	214	if (pname == NULL)
3cdd3f79	215	return (0);
301e0930	216	if (strcmp(pname, "calltrap") == 0 \|\|
3cdd3f79	217	strcmp(pname, "dblfault_handler") == 0 \|\|
f17ea84b SS	218	strcmp(pname, "nmi_calltrap") == 0 \|\|
f17ea84b SS	219	(pname[0] == 'X' && pname[1] != '_'))
3cdd3f79 MD	220	return (1);
3cdd3f79 MD	221	return (0);
301e0930	222	}