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/* $OpenBSD: db_machdep.c,v 1.2 1998/09/15 10:50:13 pefo Exp $ */
/*-
* Copyright (c) 1998 Per Fogelstrom, Opsycon AB
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed under OpenBSD by
* Per Fogelstrom, Opsycon AB, Sweden.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* JNPR: db_interface.c,v 1.6.2.1 2007/08/29 12:24:49 girish
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/mips/mips/db_interface.c 209935 2010-07-12 10:22:58Z jchandra $");
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/cons.h>
#include <sys/lock.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <sys/user.h>
#include <sys/proc.h>
#include <sys/reboot.h>
#include <machine/cache.h>
#include <machine/db_machdep.h>
#include <machine/mips_opcode.h>
#include <machine/vmparam.h>
#include <machine/md_var.h>
#define NO_REG_DEFS 1 /* Prevent asm.h from including regdef.h */
#include <machine/asm.h>
#include <machine/setjmp.h>
#include <ddb/ddb.h>
#include <ddb/db_sym.h>
#include <ddb/db_access.h>
#include <ddb/db_output.h>
#include <ddb/db_variables.h>
#include <sys/kdb.h>
static db_varfcn_t db_frame;
#define DB_OFFSET(x) (db_expr_t *)offsetof(struct trapframe, x)
struct db_variable db_regs[] = {
{ "at", DB_OFFSET(ast), db_frame },
{ "v0", DB_OFFSET(v0), db_frame },
{ "v1", DB_OFFSET(v1), db_frame },
{ "a0", DB_OFFSET(a0), db_frame },
{ "a1", DB_OFFSET(a1), db_frame },
{ "a2", DB_OFFSET(a2), db_frame },
{ "a3", DB_OFFSET(a3), db_frame },
{ "t0", DB_OFFSET(t0), db_frame },
{ "t1", DB_OFFSET(t1), db_frame },
{ "t2", DB_OFFSET(t2), db_frame },
{ "t3", DB_OFFSET(t3), db_frame },
{ "t4", DB_OFFSET(t4), db_frame },
{ "t5", DB_OFFSET(t5), db_frame },
{ "t6", DB_OFFSET(t6), db_frame },
{ "t7", DB_OFFSET(t7), db_frame },
{ "s0", DB_OFFSET(s0), db_frame },
{ "s1", DB_OFFSET(s1), db_frame },
{ "s2", DB_OFFSET(s2), db_frame },
{ "s3", DB_OFFSET(s3), db_frame },
{ "s4", DB_OFFSET(s4), db_frame },
{ "s5", DB_OFFSET(s5), db_frame },
{ "s6", DB_OFFSET(s6), db_frame },
{ "s7", DB_OFFSET(s7), db_frame },
{ "t8", DB_OFFSET(t8), db_frame },
{ "t9", DB_OFFSET(t9), db_frame },
{ "k0", DB_OFFSET(k0), db_frame },
{ "k1", DB_OFFSET(k1), db_frame },
{ "gp", DB_OFFSET(gp), db_frame },
{ "sp", DB_OFFSET(sp), db_frame },
{ "s8", DB_OFFSET(s8), db_frame },
{ "ra", DB_OFFSET(ra), db_frame },
{ "sr", DB_OFFSET(sr), db_frame },
{ "lo", DB_OFFSET(mullo), db_frame },
{ "hi", DB_OFFSET(mulhi), db_frame },
{ "bad", DB_OFFSET(badvaddr), db_frame },
{ "cs", DB_OFFSET(cause), db_frame },
{ "pc", DB_OFFSET(pc), db_frame },
};
struct db_variable *db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]);
int (*do_db_log_stack_trace_cmd)(char *);
static int
db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
{
register_t *reg;
if (kdb_frame == NULL)
return (0);
reg = (register_t *)((uintptr_t)kdb_frame + (size_t)(intptr_t)vp->valuep);
if (op == DB_VAR_GET)
*valuep = *reg;
else
*reg = *valuep;
return (1);
}
int
db_read_bytes(vm_offset_t addr, size_t size, char *data)
{
jmp_buf jb;
void *prev_jb;
int ret;
prev_jb = kdb_jmpbuf(jb);
ret = setjmp(jb);
if (ret == 0) {
/*
* 'addr' could be a memory-mapped I/O address. Try to
* do atomic load/store in unit of size requested.
*/
if ((size == 2 || size == 4 || size == 8) &&
((addr & (size -1)) == 0) &&
(((vm_offset_t)data & (size -1)) == 0)) {
switch (size) {
case 2:
*(uint16_t *)data = *(uint16_t *)addr;
break;
case 4:
*(uint32_t *)data = *(uint32_t *)addr;
break;
case 8:
atomic_load_64((volatile u_int64_t *)addr,
(u_int64_t *)data);
break;
}
} else {
char *src;
src = (char *)addr;
while (size-- > 0)
*data++ = *src++;
}
}
(void)kdb_jmpbuf(prev_jb);
return (ret);
}
int
db_write_bytes(vm_offset_t addr, size_t size, char *data)
{
int ret;
jmp_buf jb;
void *prev_jb;
prev_jb = kdb_jmpbuf(jb);
ret = setjmp(jb);
if (ret == 0) {
/*
* 'addr' could be a memory-mapped I/O address. Try to
* do atomic load/store in unit of size requested.
*/
if ((size == 2 || size == 4 || size == 8) &&
((addr & (size -1)) == 0) &&
(((vm_offset_t)data & (size -1)) == 0)) {
switch (size) {
case 2:
*(uint16_t *)addr = *(uint16_t *)data;
break;
case 4:
*(uint32_t *)addr = *(uint32_t *)data;
break;
case 8:
atomic_store_64((volatile u_int64_t *)addr,
(u_int64_t *)data);
break;
}
} else {
char *dst;
size_t len = size;
dst = (char *)addr;
while (len-- > 0)
*dst++ = *data++;
}
mips_icache_sync_range((db_addr_t) addr, size);
mips_dcache_wbinv_range((db_addr_t) addr, size);
}
(void)kdb_jmpbuf(prev_jb);
return (ret);
}
/*
* To do a single step ddb needs to know the next address
* that we will get to. It means that we need to find out
* both the address for a branch taken and for not taken, NOT! :-)
* MipsEmulateBranch will do the job to find out _exactly_ which
* address we will end up at so the 'dual bp' method is not
* requiered.
*/
db_addr_t
next_instr_address(db_addr_t pc, boolean_t bd)
{
db_addr_t next;
next = (db_addr_t)MipsEmulateBranch(kdb_frame, pc, 0, 0);
return (next);
}
/*
* Decode instruction and figure out type.
*/
int
db_inst_type(int ins)
{
InstFmt inst;
int ityp = 0;
inst.word = ins;
switch ((int)inst.JType.op) {
case OP_SPECIAL:
switch ((int)inst.RType.func) {
case OP_JR:
ityp = IT_BRANCH;
break;
case OP_JALR:
case OP_SYSCALL:
ityp = IT_CALL;
break;
}
break;
case OP_BCOND:
switch ((int)inst.IType.rt) {
case OP_BLTZ:
case OP_BLTZL:
case OP_BGEZ:
case OP_BGEZL:
ityp = IT_BRANCH;
break;
case OP_BLTZAL:
case OP_BLTZALL:
case OP_BGEZAL:
case OP_BGEZALL:
ityp = IT_CALL;
break;
}
break;
case OP_JAL:
ityp = IT_CALL;
break;
case OP_J:
case OP_BEQ:
case OP_BEQL:
case OP_BNE:
case OP_BNEL:
case OP_BLEZ:
case OP_BLEZL:
case OP_BGTZ:
case OP_BGTZL:
ityp = IT_BRANCH;
break;
case OP_COP1:
switch (inst.RType.rs) {
case OP_BCx:
case OP_BCy:
ityp = IT_BRANCH;
break;
}
break;
case OP_LB:
case OP_LH:
case OP_LW:
case OP_LD:
case OP_LBU:
case OP_LHU:
case OP_LWU:
case OP_LWC1:
ityp = IT_LOAD;
break;
case OP_SB:
case OP_SH:
case OP_SW:
case OP_SD:
case OP_SWC1:
ityp = IT_STORE;
break;
}
return (ityp);
}
/*
* Return the next pc if the given branch is taken.
* MachEmulateBranch() runs analysis for branch delay slot.
*/
db_addr_t
branch_taken(int inst, db_addr_t pc)
{
db_addr_t ra;
register_t fpucsr;
/* TBD: when is fsr set */
fpucsr = (curthread) ? curthread->td_pcb->pcb_regs.fsr : 0;
ra = (db_addr_t)MipsEmulateBranch(kdb_frame, pc, fpucsr, 0);
return (ra);
}