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unwind.c
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unwind.c
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/*
* Copyright (C) 1999-2002 Hewlett-Packard Co
* David Mosberger-Tang <davidm@hpl.hp.com>
*/
/*
* unwind.c
*
* Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2012 David Anderson
* Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2012 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Adapted from:
*
* arch/ia64/kernel/unwind.c (kernel-2.4.18-6.23)
*/
#ifdef IA64
/*
* WARNING: unw_frame_info, pt_regs and switch_stack have been
* copied to unwind.h, under the UNWIND_V[123] sections; this is
* done to rectify the need for this user-land code to use the same
* data structures that the target kernel is using.
*
* Basically it's a juggling match to keep the unw_frame_info,
* switch_stack and pt_regs structures in a "known" state -- as defined by
* the UNWIND_V[123] definitions used in the unwind.h header file -- and
* then passed to the 3 compile lines of unwind.c to create the three
* unwind_v[123].o object files.
*/
/*
* 2004-09-14 J. Nomura Added OS_INIT handling
*/
/* #include <asm/ptrace.h> can't include this -- it's changing over time! */
#include "defs.h"
#include "xen_hyper_defs.h"
typedef unsigned char u8;
typedef unsigned long long u64;
#undef PAGE_SIZE
#define PAGE_SIZE PAGESIZE()
#define GATE_ADDR (0xa000000000000000 + PAGE_SIZE)
#define CLEAR_SCRIPT_CACHE (TRUE)
#define _ASM_IA64_FPU_H
#include "unwind.h"
#include "unwind_i.h"
#include "rse.h"
static struct unw_reg_state *alloc_reg_state(void);
static void free_reg_state(struct unw_reg_state *);
static void rse_function_params(struct bt_info *bt, struct unw_frame_info *, char *);
static int load_unw_table(int);
static void verify_unw_member(char *, long);
static void verify_common_struct(char *, long);
static void dump_unwind_table(struct unw_table *);
static int unw_init_from_blocked_task(struct unw_frame_info *,
struct bt_info *);
static void unw_init_from_interruption(struct unw_frame_info *,
struct bt_info *, ulong, ulong);
static int unw_switch_from_osinit_v1(struct unw_frame_info *,
struct bt_info *);
static int unw_switch_from_osinit_v2(struct unw_frame_info *,
struct bt_info *);
static int unw_switch_from_osinit_v3(struct unw_frame_info *,
struct bt_info *, char *);
static unsigned long get_init_stack_ulong(unsigned long addr);
static void unw_init_frame_info(struct unw_frame_info *,
struct bt_info *, ulong);
static int find_save_locs(struct unw_frame_info *);
static int unw_unwind(struct unw_frame_info *);
static void run_script(struct unw_script *, struct unw_frame_info *);
static struct unw_script *script_lookup(struct unw_frame_info *);
static struct unw_script *script_new(unsigned long);
static void script_finalize(struct unw_script *, struct unw_state_record *);
static void script_emit(struct unw_script *, struct unw_insn);
static void emit_nat_info(struct unw_state_record *, int, struct unw_script *);
static struct unw_script *build_script(struct unw_frame_info *);
static struct unw_table_entry *lookup(struct unw_table *, unsigned long);
static void compile_reg(struct unw_state_record *, int, struct unw_script *);
static void compile_reg_v2(struct unw_state_record *, int, struct unw_script *);
#define UNW_LOG_CACHE_SIZE 7 /* each unw_script is ~256 bytes in size */
#define UNW_CACHE_SIZE (1 << UNW_LOG_CACHE_SIZE)
#define UNW_LOG_HASH_SIZE (UNW_LOG_CACHE_SIZE + 1)
#define UNW_HASH_SIZE (1 << UNW_LOG_HASH_SIZE)
#define UNW_DEBUG 0
#define UNW_STATS 0
#define p5 5
#define pNonSys p5 /* complement of pSys */
# define STAT(x...)
#define struct_offset(str,fld) ((char *)&((str *)NULL)->fld - (char *) 0)
#undef offsetof
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
/*
* Local snapshot of kernel's "unw" table, minus the spinlock_t and anything
* after the kernel_table. This allows the unmodified porting of the kernel
* code pieces that reference "unw.xxx" directly.
*
* The 2.6 kernel introduced a new pt_regs_offsets[32] array positioned in
* between the preg_index array and the kernel_table members.
*/
#ifdef REDHAT
static struct unw {
#else
static struct {
spinlock_t lock; /* spinlock for unwind data */
#endif /* !REDHAT */
/* list of unwind tables (one per load-module) */
struct unw_table *tables;
/* table of registers that prologues can save
(and order in which they're saved): */
unsigned char save_order[8];
/* maps a preserved register index (preg_index) to corresponding
switch_stack offset: */
unsigned short sw_off[sizeof(struct unw_frame_info) / 8];
unsigned short lru_head; /* index of lead-recently used script */
unsigned short lru_tail; /* index of most-recently used script */
/* index into unw_frame_info for preserved register i */
unsigned short preg_index[UNW_NUM_REGS];
/* unwind table for the kernel: */
struct unw_table kernel_table;
#ifndef REDHAT
/* unwind table describing the gate page (kernel code that is mapped
into user space): */
size_t gate_table_size;
unsigned long *gate_table;
/* hash table that maps instruction pointer to script index: */
unsigned short hash[UNW_HASH_SIZE];
/* script cache: */
struct unw_script cache[UNW_CACHE_SIZE];
# if UNW_DEBUG
const char *preg_name[UNW_NUM_REGS];
# endif
# if UNW_STATS
struct {
struct {
int lookups;
int hinted_hits;
int normal_hits;
int collision_chain_traversals;
} cache;
struct {
unsigned long build_time;
unsigned long run_time;
unsigned long parse_time;
int builds;
int news;
int collisions;
int runs;
} script;
struct {
unsigned long init_time;
unsigned long unwind_time;
int inits;
int unwinds;
} api;
} stat;
# endif
#endif /* !REDHAT */
} unw = { 0 };
static short pt_regs_offsets[32] = { 0 };
static struct unw_reg_state *
alloc_reg_state(void)
{
return((struct unw_reg_state *) GETBUF(sizeof(struct unw_reg_state)));
}
static void
free_reg_state(struct unw_reg_state *rs)
{
FREEBUF(rs);
}
static struct unw_labeled_state *
alloc_labeled_state(void)
{
return((struct unw_labeled_state *)
GETBUF(sizeof(struct unw_labeled_state)));
}
static void
free_labeled_state(struct unw_labeled_state *ls)
{
FREEBUF(ls);
}
typedef unsigned long unw_word;
/* Unwind accessors. */
static inline unsigned long
pt_regs_off_v2 (unsigned long reg)
{
short off = -1;
if (reg < 32)
off = pt_regs_offsets[reg];
if (off < 0) {
if (reg > 0)
error(INFO, "unwind: bad scratch reg r%lu\n", reg);
off = 0;
}
return (unsigned long) off;
}
/*
* Returns offset of rREG in struct pt_regs.
*/
static inline unsigned long
pt_regs_off (unsigned long reg)
{
unsigned long off =0;
if (machdep->flags & UNW_PTREGS)
return pt_regs_off_v2(reg);
if (reg >= 1 && reg <= 3)
off = struct_offset(struct pt_regs, r1) + 8*(reg - 1);
else if (reg <= 11)
off = struct_offset(struct pt_regs, r8) + 8*(reg - 8);
else if (reg <= 15)
off = struct_offset(struct pt_regs, r12) + 8*(reg - 12);
else if (reg <= 31)
off = struct_offset(struct pt_regs, r16) + 8*(reg - 16);
else if (reg > 0)
error(INFO, "unwind: bad scratch reg r%lu\n", reg);
return off;
}
#ifdef UNWIND_V1
static inline struct pt_regs *
get_scratch_regs (struct unw_frame_info *info)
{
struct pt_regs *pt_unused = NULL;
error(INFO, "get_scratch_regs: should not be here!\n");
return pt_unused;
}
#endif
#ifdef UNWIND_V2
static inline struct pt_regs *
get_scratch_regs (struct unw_frame_info *info)
{
if (!info->pt) {
/* This should not happen with valid unwind info. */
error(INFO,
"get_scratch_regs: bad unwind info: resetting info->pt\n");
if (info->flags & UNW_FLAG_INTERRUPT_FRAME)
info->pt = (unsigned long)((struct pt_regs *)
info->psp - 1);
else
info->pt = info->sp - 16;
}
return (struct pt_regs *) info->pt;
}
#endif
#ifdef UNWIND_V3
static inline struct pt_regs *
get_scratch_regs (struct unw_frame_info *info)
{
if (!info->pt) {
/* This should not happen with valid unwind info. */
error(INFO,
"get_scratch_regs: bad unwind info: resetting info->pt\n");
if (info->flags & UNW_FLAG_INTERRUPT_FRAME)
info->pt = (unsigned long)((struct pt_regs *)
info->psp - 1);
else
info->pt = info->sp - 16;
}
return (struct pt_regs *) info->pt;
}
#endif
int
#ifdef UNWIND_V1
unw_access_gr_v1 (struct unw_frame_info *info, int regnum, unsigned long *val, char *nat, int write)
#endif
#ifdef UNWIND_V2
unw_access_gr_v2 (struct unw_frame_info *info, int regnum, unsigned long *val, char *nat, int write)
#endif
#ifdef UNWIND_V3
unw_access_gr_v3 (struct unw_frame_info *info, int regnum, unsigned long *val, char *nat, int write)
#endif
{
unsigned long *addr, *nat_addr, nat_mask = 0, dummy_nat;
struct unw_ireg *ireg;
struct pt_regs *pt;
struct bt_info *bt = (struct bt_info *)info->task;
if ((unsigned) regnum - 1 >= 127) {
error(INFO, "unwind: trying to access non-existent r%u\n",
regnum);
return -1;
}
if (regnum < 32) {
if (regnum >= 4 && regnum <= 7) {
/* access a preserved register */
ireg = &info->r4 + (regnum - 4);
addr = ireg->loc;
if (addr) {
nat_addr = addr + ireg->nat.off;
switch (ireg->nat.type) {
case UNW_NAT_VAL:
/* simulate getf.sig/setf.sig */
if (write) {
if (*nat) {
/* write NaTVal and be done with it */
addr[0] = 0;
addr[1] = 0x1fffe;
return 0;
}
addr[1] = 0x1003e;
} else {
if (addr[0] == 0 && addr[1] == 0x1ffe) {
/* return NaT and be done with it */
*val = 0;
*nat = 1;
return 0;
}
}
/* fall through */
case UNW_NAT_NONE:
dummy_nat = 0;
nat_addr = &dummy_nat;
break;
case UNW_NAT_MEMSTK:
nat_mask = (1UL << ((long) addr & 0x1f8)/8);
break;
case UNW_NAT_REGSTK:
nat_addr = ia64_rse_rnat_addr(addr);
if ((unsigned long) addr < info->regstk.limit
|| (unsigned long) addr >= info->regstk.top)
{
error(INFO,
"unwind: %p outside of regstk "
"[0x%lx-0x%lx)\n", (void *) addr,
info->regstk.limit,
info->regstk.top);
return -1;
}
if ((unsigned long) nat_addr >= info->regstk.top)
nat_addr = &info->sw->ar_rnat;
nat_mask = (1UL << ia64_rse_slot_num(addr));
break;
}
} else {
addr = &info->sw->r4 + (regnum - 4);
nat_addr = &info->sw->ar_unat;
nat_mask = (1UL << ((long) addr & 0x1f8)/8);
}
} else {
/* access a scratch register */
if (machdep->flags & UNW_PTREGS) {
pt = get_scratch_regs(info);
addr = (unsigned long *) ((unsigned long)pt + pt_regs_off(regnum));
} else {
if (info->flags & UNW_FLAG_INTERRUPT_FRAME)
pt = (struct pt_regs *) info->psp - 1;
else
pt = (struct pt_regs *) info->sp - 1;
addr = (unsigned long *) ((long) pt + pt_regs_off(regnum));
}
if (info->pri_unat_loc)
nat_addr = info->pri_unat_loc;
else
nat_addr = &info->sw->ar_unat;
nat_mask = (1UL << ((long) addr & 0x1f8)/8);
}
} else {
/* access a stacked register */
addr = ia64_rse_skip_regs((unsigned long *) info->bsp, regnum - 32);
nat_addr = ia64_rse_rnat_addr(addr);
if ((unsigned long) addr < info->regstk.limit
|| (unsigned long) addr >= info->regstk.top)
{
error(INFO, "unwind: ignoring attempt to access register outside of rbs\n");
return -1;
}
if ((unsigned long) nat_addr >= info->regstk.top)
nat_addr = &info->sw->ar_rnat;
nat_mask = (1UL << ia64_rse_slot_num(addr));
}
if (write) {
*addr = *val;
if (*nat)
*nat_addr |= nat_mask;
else
*nat_addr &= ~nat_mask;
} else {
if ((IA64_GET_STACK_ULONG(nat_addr) & nat_mask) == 0) {
*val = IA64_GET_STACK_ULONG(addr);
*nat = 0;
} else {
*val = 0; /* if register is a NaT, *addr may contain kernel data! */
*nat = 1;
}
}
return 0;
}
int
#ifdef UNWIND_V1
unw_access_br_v1 (struct unw_frame_info *info, int regnum, unsigned long *val, int write)
#endif
#ifdef UNWIND_V2
unw_access_br_v2 (struct unw_frame_info *info, int regnum, unsigned long *val, int write)
#endif
#ifdef UNWIND_V3
unw_access_br_v3 (struct unw_frame_info *info, int regnum, unsigned long *val, int write)
#endif
{
unsigned long *addr;
struct pt_regs *pt;
struct bt_info *bt = (struct bt_info *)info->task;
if (info->flags & UNW_FLAG_INTERRUPT_FRAME)
pt = (struct pt_regs *) info->psp - 1;
else
pt = (struct pt_regs *) info->sp - 1;
switch (regnum) {
/* scratch: */
case 0: addr = &pt->b0; break;
case 6: addr = &pt->b6; break;
case 7: addr = &pt->b7; break;
/* preserved: */
case 1: case 2: case 3: case 4: case 5:
addr = *(&info->b1_loc + (regnum - 1));
if (!addr)
addr = &info->sw->b1 + (regnum - 1);
break;
default:
error(INFO, "unwind: trying to access non-existent b%u\n",
regnum);
return -1;
}
if (write)
*addr = *val;
else
*val = IA64_GET_STACK_ULONG(addr);
return 0;
}
#ifdef UNWIND_V1
int
unw_access_fr_v1 (struct unw_frame_info *info, int regnum, struct ia64_fpreg *val, int write)
{
struct ia64_fpreg *addr = 0;
struct pt_regs *pt;
struct bt_info *bt = (struct bt_info *)info->task;
if ((unsigned) (regnum - 2) >= 126) {
error(INFO, "unwind: trying to access non-existent f%u\n",
regnum);
return -1;
}
if (info->flags & UNW_FLAG_INTERRUPT_FRAME)
pt = (struct pt_regs *) info->psp - 1;
else
pt = (struct pt_regs *) info->sp - 1;
if (regnum <= 5) {
addr = *(&info->f2_loc + (regnum - 2));
if (!addr)
addr = &info->sw->f2 + (regnum - 2);
} else if (regnum <= 15) {
if (regnum <= 9)
addr = &pt->f6 + (regnum - 6);
else
addr = &info->sw->f10 + (regnum - 10);
} else if (regnum <= 31) {
addr = info->fr_loc[regnum - 16];
if (!addr)
addr = &info->sw->f16 + (regnum - 16);
} else {
#ifdef REDHAT
struct bt_info *bt = (struct bt_info *)info->task;
addr = (struct ia64_fpreg *)
(bt->task + OFFSET(task_struct_thread) +
OFFSET(thread_struct_fph) +
((regnum - 32) * sizeof(struct ia64_fpreg)));
#else
struct task_struct *t = info->task;
if (write)
ia64_sync_fph(t);
else
ia64_flush_fph(t);
addr = t->thread.fph + (regnum - 32);
#endif
}
if (write)
*addr = *val;
else
GET_STACK_DATA(addr, val, sizeof(struct ia64_fpreg));
return 0;
}
#endif
#ifdef UNWIND_V2
int
unw_access_fr_v2 (struct unw_frame_info *info, int regnum, struct ia64_fpreg *val, int write)
{
struct ia64_fpreg *addr = 0;
struct pt_regs *pt;
struct bt_info *bt = (struct bt_info *)info->task;
if ((unsigned) (regnum - 2) >= 126) {
error(INFO, "unwind: trying to access non-existent f%u\n",
regnum);
return -1;
}
if (regnum <= 5) {
addr = *(&info->f2_loc + (regnum - 2));
if (!addr)
addr = &info->sw->f2 + (regnum - 2);
} else if (regnum <= 15) {
if (regnum <= 11) {
pt = get_scratch_regs(info);
addr = &pt->f6 + (regnum - 6);
}
else
addr = &info->sw->f12 + (regnum - 12);
} else if (regnum <= 31) {
addr = info->fr_loc[regnum - 16];
if (!addr)
addr = &info->sw->f16 + (regnum - 16);
} else {
#ifdef REDHAT
struct bt_info *bt = (struct bt_info *)info->task;
addr = (struct ia64_fpreg *)
(bt->task + OFFSET(task_struct_thread) +
OFFSET(thread_struct_fph) +
((regnum - 32) * sizeof(struct ia64_fpreg)));
#else
struct task_struct *t = info->task;
if (write)
ia64_sync_fph(t);
else
ia64_flush_fph(t);
addr = t->thread.fph + (regnum - 32);
#endif
}
if (write)
*addr = *val;
else
GET_STACK_DATA(addr, val, sizeof(struct ia64_fpreg));
return 0;
}
#endif
#ifdef UNWIND_V3
int
unw_access_fr_v3 (struct unw_frame_info *info, int regnum, struct ia64_fpreg *val, int write)
{
struct ia64_fpreg *addr = 0;
struct pt_regs *pt;
struct bt_info *bt = (struct bt_info *)info->task;
if ((unsigned) (regnum - 2) >= 126) {
error(INFO, "unwind: trying to access non-existent f%u\n",
regnum);
return -1;
}
if (regnum <= 5) {
addr = *(&info->f2_loc + (regnum - 2));
if (!addr)
addr = &info->sw->f2 + (regnum - 2);
} else if (regnum <= 15) {
if (regnum <= 11) {
pt = get_scratch_regs(info);
addr = &pt->f6 + (regnum - 6);
}
else
addr = &info->sw->f12 + (regnum - 12);
} else if (regnum <= 31) {
addr = info->fr_loc[regnum - 16];
if (!addr)
addr = &info->sw->f16 + (regnum - 16);
} else {
#ifdef REDHAT
struct bt_info *bt = (struct bt_info *)info->task;
addr = (struct ia64_fpreg *)
(bt->task + OFFSET(task_struct_thread) +
OFFSET(thread_struct_fph) +
((regnum - 32) * sizeof(struct ia64_fpreg)));
#else
struct task_struct *t = info->task;
if (write)
ia64_sync_fph(t);
else
ia64_flush_fph(t);
addr = t->thread.fph + (regnum - 32);
#endif
}
if (write)
*addr = *val;
else
GET_STACK_DATA(addr, val, sizeof(struct ia64_fpreg));
return 0;
}
#endif
int
#ifdef UNWIND_V1
unw_access_ar_v1 (struct unw_frame_info *info, int regnum, unsigned long *val, int write)
#endif
#ifdef UNWIND_V2
unw_access_ar_v2 (struct unw_frame_info *info, int regnum, unsigned long *val, int write)
#endif
#ifdef UNWIND_V3
unw_access_ar_v3 (struct unw_frame_info *info, int regnum, unsigned long *val, int write)
#endif
{
unsigned long *addr;
struct pt_regs *pt;
struct bt_info *bt = (struct bt_info *)info->task;
if (info->flags & UNW_FLAG_INTERRUPT_FRAME)
pt = (struct pt_regs *) info->psp - 1;
else
pt = (struct pt_regs *) info->sp - 1;
switch (regnum) {
case UNW_AR_BSP:
addr = info->bsp_loc;
if (!addr)
addr = &info->sw->ar_bspstore;
break;
case UNW_AR_BSPSTORE:
addr = info->bspstore_loc;
if (!addr)
addr = &info->sw->ar_bspstore;
break;
case UNW_AR_PFS:
addr = info->pfs_loc;
if (!addr)
addr = &info->sw->ar_pfs;
break;
case UNW_AR_RNAT:
addr = info->rnat_loc;
if (!addr)
addr = &info->sw->ar_rnat;
break;
case UNW_AR_UNAT:
addr = info->unat_loc;
if (!addr)
addr = &info->sw->ar_unat;
break;
case UNW_AR_LC:
addr = info->lc_loc;
if (!addr)
addr = &info->sw->ar_lc;
break;
case UNW_AR_EC:
if (!info->cfm_loc)
return -1;
if (write)
*info->cfm_loc =
(*info->cfm_loc & ~(0x3fUL << 52)) | ((*val & 0x3f) << 52);
else
*val = (IA64_GET_STACK_ULONG(info->cfm_loc) >> 52) & 0x3f;
return 0;
case UNW_AR_FPSR:
addr = info->fpsr_loc;
if (!addr)
addr = &info->sw->ar_fpsr;
break;
case UNW_AR_RSC:
if (machdep->flags & UNW_PTREGS)
pt = get_scratch_regs(info);
addr = &pt->ar_rsc;
break;
case UNW_AR_CCV:
if (machdep->flags & UNW_PTREGS)
pt = get_scratch_regs(info);
addr = &pt->ar_ccv;
break;
#if defined(UNWIND_V3)
case UNW_AR_CSD:
if (machdep->flags & UNW_PTREGS)
pt = get_scratch_regs(info);
addr = &pt->ar_csd;
break;
case UNW_AR_SSD:
if (machdep->flags & UNW_PTREGS)
pt = get_scratch_regs(info);
addr = &pt->ar_ssd;
break;
#endif
default:
error(INFO, "unwind: trying to access non-existent ar%u\n",
regnum);
return -1;
}
if (write)
*addr = *val;
else
*val = IA64_GET_STACK_ULONG(addr);
return 0;
}
int
#ifdef UNWIND_V1
unw_access_pr_v1 (struct unw_frame_info *info, unsigned long *val, int write)
#endif
#ifdef UNWIND_V2
unw_access_pr_v2 (struct unw_frame_info *info, unsigned long *val, int write)
#endif
#ifdef UNWIND_V3
unw_access_pr_v3 (struct unw_frame_info *info, unsigned long *val, int write)
#endif
{
unsigned long *addr;
struct bt_info *bt = (struct bt_info *)info->task;
addr = info->pr_loc;
if (!addr)
addr = &info->sw->pr;
if (write)
*addr = *val;
else
*val = IA64_GET_STACK_ULONG(addr);
return 0;
}
/* Routines to manipulate the state stack. */
static inline void
push (struct unw_state_record *sr)
{
struct unw_reg_state *rs;
rs = alloc_reg_state();
if (!rs) {
error(INFO, "unwind: cannot stack reg state!\n");
return;
}
memcpy(rs, &sr->curr, sizeof(*rs));
sr->curr.next = rs;
}
static void
pop (struct unw_state_record *sr)
{
struct unw_reg_state *rs = sr->curr.next;
if (!rs) {
error(INFO, "unwind: stack underflow!\n");
return;
}
memcpy(&sr->curr, rs, sizeof(*rs));
free_reg_state(rs);
}
/* Make a copy of the state stack. Non-recursive to avoid stack overflows. */
static struct unw_reg_state *
dup_state_stack (struct unw_reg_state *rs)
{
struct unw_reg_state *copy, *prev = NULL, *first = NULL;
while (rs) {
copy = alloc_reg_state();
if (!copy) {
error(INFO, "unwind.dup_state_stack: out of memory\n");
return NULL;
}
memcpy(copy, rs, sizeof(*copy));
if (first)
prev->next = copy;
else
first = copy;
rs = rs->next;
prev = copy;
}
return first;
}
/* Free all stacked register states (but not RS itself). */
static void
free_state_stack (struct unw_reg_state *rs)
{
struct unw_reg_state *p, *next;
for (p = rs->next; p != NULL; p = next) {
next = p->next;
free_reg_state(p);
}
rs->next = NULL;
}
/* Routines to manipulate the state stack. */
static enum unw_register_index __attribute__((const))
decode_abreg (unsigned char abreg, int memory)
{
switch (abreg) {
case 0x04 ... 0x07: return UNW_REG_R4 + (abreg - 0x04);
case 0x22 ... 0x25: return UNW_REG_F2 + (abreg - 0x22);
case 0x30 ... 0x3f: return UNW_REG_F16 + (abreg - 0x30);
case 0x41 ... 0x45: return UNW_REG_B1 + (abreg - 0x41);
case 0x60: return UNW_REG_PR;
case 0x61: return UNW_REG_PSP;
case 0x62: return memory ? UNW_REG_PRI_UNAT_MEM : UNW_REG_PRI_UNAT_GR;
case 0x63: return UNW_REG_RP;
case 0x64: return UNW_REG_BSP;
case 0x65: return UNW_REG_BSPSTORE;
case 0x66: return UNW_REG_RNAT;
case 0x67: return UNW_REG_UNAT;
case 0x68: return UNW_REG_FPSR;
case 0x69: return UNW_REG_PFS;
case 0x6a: return UNW_REG_LC;
default:
break;
}
error(INFO, "unwind: bad abreg=0x%x\n", abreg);
return UNW_REG_LC;
}
static void
set_reg (struct unw_reg_info *reg, enum unw_where where, int when, unsigned long val)
{
reg->val = val;
reg->where = where;
if (reg->when == UNW_WHEN_NEVER)
reg->when = when;
}
static void
alloc_spill_area (unsigned long *offp, unsigned long regsize,
struct unw_reg_info *lo, struct unw_reg_info *hi)
{
struct unw_reg_info *reg;
for (reg = hi; reg >= lo; --reg) {
if (reg->where == UNW_WHERE_SPILL_HOME) {
reg->where = UNW_WHERE_PSPREL;
*offp -= regsize;
reg->val = *offp;
#ifndef KERNEL_FIX
reg->val = 0x10 - *offp;
*offp += regsize;
#endif
}
}
}
static inline void
spill_next_when (struct unw_reg_info **regp, struct unw_reg_info *lim, unw_word t)
{
struct unw_reg_info *reg;
for (reg = *regp; reg <= lim; ++reg) {
if (reg->where == UNW_WHERE_SPILL_HOME) {
reg->when = t;
*regp = reg + 1;
return;
}
}
error(INFO, "unwind: excess spill!\n");
}
static inline void
finish_prologue (struct unw_state_record *sr)
{
struct unw_reg_info *reg;
unsigned long off;
int i;
/*
* First, resolve implicit register save locations (see Section "11.4.2.3 Rules
* for Using Unwind Descriptors", rule 3):
*/
for (i = 0; i < (int) sizeof(unw.save_order)/sizeof(unw.save_order[0]); ++i) {
reg = sr->curr.reg + unw.save_order[i];
if (reg->where == UNW_WHERE_GR_SAVE) {
reg->where = UNW_WHERE_GR;
reg->val = sr->gr_save_loc++;
}
}
/*
* Next, compute when the fp, general, and branch registers get
* saved. This must come before alloc_spill_area() because
* we need to know which registers are spilled to their home
* locations.
*/
if (sr->imask) {
unsigned char kind, mask = 0, *cp = sr->imask;
unsigned long t;
static const unsigned char limit[3] = {
UNW_REG_F31, UNW_REG_R7, UNW_REG_B5
};
struct unw_reg_info *(regs[3]);
regs[0] = sr->curr.reg + UNW_REG_F2;
regs[1] = sr->curr.reg + UNW_REG_R4;
regs[2] = sr->curr.reg + UNW_REG_B1;
for (t = 0; t < sr->region_len; ++t) {
if ((t & 3) == 0)
mask = *cp++;
kind = (mask >> 2*(3-(t & 3))) & 3;
if (kind > 0)
spill_next_when(®s[kind - 1], sr->curr.reg + limit[kind - 1],
sr->region_start + t);
}
}
/*
* Next, lay out the memory stack spill area:
*/
if (sr->any_spills) {
off = sr->spill_offset;
alloc_spill_area(&off, 16, sr->curr.reg + UNW_REG_F2, sr->curr.reg + UNW_REG_F31);
alloc_spill_area(&off, 8, sr->curr.reg + UNW_REG_B1, sr->curr.reg + UNW_REG_B5);
alloc_spill_area(&off, 8, sr->curr.reg + UNW_REG_R4, sr->curr.reg + UNW_REG_R7);
}
}
/*
* Region header descriptors.
*/
static void
desc_prologue (int body, unw_word rlen, unsigned char mask, unsigned char grsave,
struct unw_state_record *sr)
{
int i;
if (!(sr->in_body || sr->first_region))
finish_prologue(sr);
sr->first_region = 0;