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-rw-r--r--arch/ia64/kernel/unwind.c2320
1 files changed, 0 insertions, 2320 deletions
diff --git a/arch/ia64/kernel/unwind.c b/arch/ia64/kernel/unwind.c
deleted file mode 100644
index 7601fe0622d2..000000000000
--- a/arch/ia64/kernel/unwind.c
+++ /dev/null
@@ -1,2320 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (C) 1999-2004 Hewlett-Packard Co
- * David Mosberger-Tang <davidm@hpl.hp.com>
- * Copyright (C) 2003 Fenghua Yu <fenghua.yu@intel.com>
- * - Change pt_regs_off() to make it less dependent on pt_regs structure.
- */
-/*
- * This file implements call frame unwind support for the Linux
- * kernel. Parsing and processing the unwind information is
- * time-consuming, so this implementation translates the unwind
- * descriptors into unwind scripts. These scripts are very simple
- * (basically a sequence of assignments) and efficient to execute.
- * They are cached for later re-use. Each script is specific for a
- * given instruction pointer address and the set of predicate values
- * that the script depends on (most unwind descriptors are
- * unconditional and scripts often do not depend on predicates at
- * all). This code is based on the unwind conventions described in
- * the "IA-64 Software Conventions and Runtime Architecture" manual.
- *
- * SMP conventions:
- * o updates to the global unwind data (in structure "unw") are serialized
- * by the unw.lock spinlock
- * o each unwind script has its own read-write lock; a thread must acquire
- * a read lock before executing a script and must acquire a write lock
- * before modifying a script
- * o if both the unw.lock spinlock and a script's read-write lock must be
- * acquired, then the read-write lock must be acquired first.
- */
-#include <linux/module.h>
-#include <linux/memblock.h>
-#include <linux/elf.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/slab.h>
-
-#include <asm/unwind.h>
-
-#include <asm/delay.h>
-#include <asm/page.h>
-#include <asm/ptrace.h>
-#include <asm/ptrace_offsets.h>
-#include <asm/rse.h>
-#include <asm/sections.h>
-#include <linux/uaccess.h>
-
-#include "entry.h"
-#include "unwind_i.h"
-
-#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_STATS 0 /* WARNING: this disabled interrupts for long time-spans!! */
-
-#ifdef UNW_DEBUG
- static unsigned int unw_debug_level = UNW_DEBUG;
-# define UNW_DEBUG_ON(n) unw_debug_level >= n
- /* Do not code a printk level, not all debug lines end in newline */
-# define UNW_DPRINT(n, ...) if (UNW_DEBUG_ON(n)) printk(__VA_ARGS__)
-# undef inline
-# define inline
-#else /* !UNW_DEBUG */
-# define UNW_DEBUG_ON(n) 0
-# define UNW_DPRINT(n, ...)
-#endif /* UNW_DEBUG */
-
-#if UNW_STATS
-# define STAT(x...) x
-#else
-# define STAT(x...)
-#endif
-
-#define alloc_reg_state() kmalloc(sizeof(struct unw_reg_state), GFP_ATOMIC)
-#define free_reg_state(usr) kfree(usr)
-#define alloc_labeled_state() kmalloc(sizeof(struct unw_labeled_state), GFP_ATOMIC)
-#define free_labeled_state(usr) kfree(usr)
-
-typedef unsigned long unw_word;
-typedef unsigned char unw_hash_index_t;
-
-static struct {
- spinlock_t lock; /* spinlock for unwind data */
-
- /* list of unwind tables (one per load-module) */
- struct unw_table *tables;
-
- unsigned long r0; /* constant 0 for r0 */
-
- /* table of registers that prologues can save (and order in which they're saved): */
- const 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];
-
- short pt_regs_offsets[32];
-
- /* unwind table for the kernel: */
- struct unw_table kernel_table;
-
- /* 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];
-
-# ifdef 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
-} unw = {
- .tables = &unw.kernel_table,
- .lock = __SPIN_LOCK_UNLOCKED(unw.lock),
- .save_order = {
- UNW_REG_RP, UNW_REG_PFS, UNW_REG_PSP, UNW_REG_PR,
- UNW_REG_UNAT, UNW_REG_LC, UNW_REG_FPSR, UNW_REG_PRI_UNAT_GR
- },
- .preg_index = {
- offsetof(struct unw_frame_info, pri_unat_loc)/8, /* PRI_UNAT_GR */
- offsetof(struct unw_frame_info, pri_unat_loc)/8, /* PRI_UNAT_MEM */
- offsetof(struct unw_frame_info, bsp_loc)/8,
- offsetof(struct unw_frame_info, bspstore_loc)/8,
- offsetof(struct unw_frame_info, pfs_loc)/8,
- offsetof(struct unw_frame_info, rnat_loc)/8,
- offsetof(struct unw_frame_info, psp)/8,
- offsetof(struct unw_frame_info, rp_loc)/8,
- offsetof(struct unw_frame_info, r4)/8,
- offsetof(struct unw_frame_info, r5)/8,
- offsetof(struct unw_frame_info, r6)/8,
- offsetof(struct unw_frame_info, r7)/8,
- offsetof(struct unw_frame_info, unat_loc)/8,
- offsetof(struct unw_frame_info, pr_loc)/8,
- offsetof(struct unw_frame_info, lc_loc)/8,
- offsetof(struct unw_frame_info, fpsr_loc)/8,
- offsetof(struct unw_frame_info, b1_loc)/8,
- offsetof(struct unw_frame_info, b2_loc)/8,
- offsetof(struct unw_frame_info, b3_loc)/8,
- offsetof(struct unw_frame_info, b4_loc)/8,
- offsetof(struct unw_frame_info, b5_loc)/8,
- offsetof(struct unw_frame_info, f2_loc)/8,
- offsetof(struct unw_frame_info, f3_loc)/8,
- offsetof(struct unw_frame_info, f4_loc)/8,
- offsetof(struct unw_frame_info, f5_loc)/8,
- offsetof(struct unw_frame_info, fr_loc[16 - 16])/8,
- offsetof(struct unw_frame_info, fr_loc[17 - 16])/8,
- offsetof(struct unw_frame_info, fr_loc[18 - 16])/8,
- offsetof(struct unw_frame_info, fr_loc[19 - 16])/8,
- offsetof(struct unw_frame_info, fr_loc[20 - 16])/8,
- offsetof(struct unw_frame_info, fr_loc[21 - 16])/8,
- offsetof(struct unw_frame_info, fr_loc[22 - 16])/8,
- offsetof(struct unw_frame_info, fr_loc[23 - 16])/8,
- offsetof(struct unw_frame_info, fr_loc[24 - 16])/8,
- offsetof(struct unw_frame_info, fr_loc[25 - 16])/8,
- offsetof(struct unw_frame_info, fr_loc[26 - 16])/8,
- offsetof(struct unw_frame_info, fr_loc[27 - 16])/8,
- offsetof(struct unw_frame_info, fr_loc[28 - 16])/8,
- offsetof(struct unw_frame_info, fr_loc[29 - 16])/8,
- offsetof(struct unw_frame_info, fr_loc[30 - 16])/8,
- offsetof(struct unw_frame_info, fr_loc[31 - 16])/8,
- },
- .pt_regs_offsets = {
- [0] = -1,
- offsetof(struct pt_regs, r1),
- offsetof(struct pt_regs, r2),
- offsetof(struct pt_regs, r3),
- [4] = -1, [5] = -1, [6] = -1, [7] = -1,
- offsetof(struct pt_regs, r8),
- offsetof(struct pt_regs, r9),
- offsetof(struct pt_regs, r10),
- offsetof(struct pt_regs, r11),
- offsetof(struct pt_regs, r12),
- offsetof(struct pt_regs, r13),
- offsetof(struct pt_regs, r14),
- offsetof(struct pt_regs, r15),
- offsetof(struct pt_regs, r16),
- offsetof(struct pt_regs, r17),
- offsetof(struct pt_regs, r18),
- offsetof(struct pt_regs, r19),
- offsetof(struct pt_regs, r20),
- offsetof(struct pt_regs, r21),
- offsetof(struct pt_regs, r22),
- offsetof(struct pt_regs, r23),
- offsetof(struct pt_regs, r24),
- offsetof(struct pt_regs, r25),
- offsetof(struct pt_regs, r26),
- offsetof(struct pt_regs, r27),
- offsetof(struct pt_regs, r28),
- offsetof(struct pt_regs, r29),
- offsetof(struct pt_regs, r30),
- offsetof(struct pt_regs, r31),
- },
- .hash = { [0 ... UNW_HASH_SIZE - 1] = -1 },
-#ifdef UNW_DEBUG
- .preg_name = {
- "pri_unat_gr", "pri_unat_mem", "bsp", "bspstore", "ar.pfs", "ar.rnat", "psp", "rp",
- "r4", "r5", "r6", "r7",
- "ar.unat", "pr", "ar.lc", "ar.fpsr",
- "b1", "b2", "b3", "b4", "b5",
- "f2", "f3", "f4", "f5",
- "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
- "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31"
- }
-#endif
-};
-
-static inline int
-read_only (void *addr)
-{
- return (unsigned long) ((char *) addr - (char *) &unw.r0) < sizeof(unw.r0);
-}
-
-/*
- * Returns offset of rREG in struct pt_regs.
- */
-static inline unsigned long
-pt_regs_off (unsigned long reg)
-{
- short off = -1;
-
- if (reg < ARRAY_SIZE(unw.pt_regs_offsets))
- off = unw.pt_regs_offsets[reg];
-
- if (off < 0) {
- UNW_DPRINT(0, "unwind.%s: bad scratch reg r%lu\n", __func__, reg);
- off = 0;
- }
- return (unsigned long) off;
-}
-
-static inline struct pt_regs *
-get_scratch_regs (struct unw_frame_info *info)
-{
- if (!info->pt) {
- /* This should not happen with valid unwind info. */
- UNW_DPRINT(0, "unwind.%s: bad unwind info: resetting info->pt\n", __func__);
- if (info->flags & UNW_FLAG_INTERRUPT_FRAME)
- info->pt = (unsigned long) ((struct pt_regs *) info->psp - 1);
- else
- info->pt = info->sp - 16;
- }
- UNW_DPRINT(3, "unwind.%s: sp 0x%lx pt 0x%lx\n", __func__, info->sp, info->pt);
- return (struct pt_regs *) info->pt;
-}
-
-/* Unwind accessors. */
-
-int
-unw_access_gr (struct unw_frame_info *info, int regnum, unsigned long *val, char *nat, int write)
-{
- unsigned long *addr, *nat_addr, nat_mask = 0, dummy_nat;
- struct unw_ireg *ireg;
- struct pt_regs *pt;
-
- if ((unsigned) regnum - 1 >= 127) {
- if (regnum == 0 && !write) {
- *val = 0; /* read r0 always returns 0 */
- *nat = 0;
- return 0;
- }
- UNW_DPRINT(0, "unwind.%s: trying to access non-existent r%u\n",
- __func__, 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)
- {
- UNW_DPRINT(0, "unwind.%s: %p outside of regstk "
- "[0x%lx-0x%lx)\n",
- __func__, (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 */
- pt = get_scratch_regs(info);
- addr = (unsigned long *) ((unsigned long)pt + pt_regs_off(regnum));
- if (info->pri_unat_loc)
- nat_addr = info->pri_unat_loc;
- else
- nat_addr = &info->sw->caller_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)
- {
- UNW_DPRINT(0, "unwind.%s: ignoring attempt to access register outside "
- "of rbs\n", __func__);
- 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) {
- if (read_only(addr)) {
- UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n",
- __func__);
- } else {
- *addr = *val;
- if (*nat)
- *nat_addr |= nat_mask;
- else
- *nat_addr &= ~nat_mask;
- }
- } else {
- if ((*nat_addr & nat_mask) == 0) {
- *val = *addr;
- *nat = 0;
- } else {
- *val = 0; /* if register is a NaT, *addr may contain kernel data! */
- *nat = 1;
- }
- }
- return 0;
-}
-EXPORT_SYMBOL(unw_access_gr);
-
-int
-unw_access_br (struct unw_frame_info *info, int regnum, unsigned long *val, int write)
-{
- unsigned long *addr;
- struct pt_regs *pt;
-
- switch (regnum) {
- /* scratch: */
- case 0: pt = get_scratch_regs(info); addr = &pt->b0; break;
- case 6: pt = get_scratch_regs(info); addr = &pt->b6; break;
- case 7: pt = get_scratch_regs(info); 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:
- UNW_DPRINT(0, "unwind.%s: trying to access non-existent b%u\n",
- __func__, regnum);
- return -1;
- }
- if (write)
- if (read_only(addr)) {
- UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n",
- __func__);
- } else
- *addr = *val;
- else
- *val = *addr;
- return 0;
-}
-EXPORT_SYMBOL(unw_access_br);
-
-int
-unw_access_fr (struct unw_frame_info *info, int regnum, struct ia64_fpreg *val, int write)
-{
- struct ia64_fpreg *addr = NULL;
- struct pt_regs *pt;
-
- if ((unsigned) (regnum - 2) >= 126) {
- UNW_DPRINT(0, "unwind.%s: trying to access non-existent f%u\n",
- __func__, 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 {
- struct task_struct *t = info->task;
-
- if (write)
- ia64_sync_fph(t);
- else
- ia64_flush_fph(t);
- addr = t->thread.fph + (regnum - 32);
- }
-
- if (write)
- if (read_only(addr)) {
- UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n",
- __func__);
- } else
- *addr = *val;
- else
- *val = *addr;
- return 0;
-}
-EXPORT_SYMBOL(unw_access_fr);
-
-int
-unw_access_ar (struct unw_frame_info *info, int regnum, unsigned long *val, int write)
-{
- unsigned long *addr;
- struct pt_regs *pt;
-
- 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->caller_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 = (*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:
- pt = get_scratch_regs(info);
- addr = &pt->ar_rsc;
- break;
-
- case UNW_AR_CCV:
- pt = get_scratch_regs(info);
- addr = &pt->ar_ccv;
- break;
-
- case UNW_AR_CSD:
- pt = get_scratch_regs(info);
- addr = &pt->ar_csd;
- break;
-
- case UNW_AR_SSD:
- pt = get_scratch_regs(info);
- addr = &pt->ar_ssd;
- break;
-
- default:
- UNW_DPRINT(0, "unwind.%s: trying to access non-existent ar%u\n",
- __func__, regnum);
- return -1;
- }
-
- if (write) {
- if (read_only(addr)) {
- UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n",
- __func__);
- } else
- *addr = *val;
- } else
- *val = *addr;
- return 0;
-}
-EXPORT_SYMBOL(unw_access_ar);
-
-int
-unw_access_pr (struct unw_frame_info *info, unsigned long *val, int write)
-{
- unsigned long *addr;
-
- addr = info->pr_loc;
- if (!addr)
- addr = &info->sw->pr;
-
- if (write) {
- if (read_only(addr)) {
- UNW_DPRINT(0, "unwind.%s: ignoring attempt to write read-only location\n",
- __func__);
- } else
- *addr = *val;
- } else
- *val = *addr;
- return 0;
-}
-EXPORT_SYMBOL(unw_access_pr);
-
-
-/* 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) {
- printk(KERN_ERR "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) {
- printk(KERN_ERR "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) {
- printk(KERN_ERR "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;
-}
-
-/* Unwind decoder routines */
-
-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;
- }
- UNW_DPRINT(0, "unwind.%s: bad abreg=0x%x\n", __func__, 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;
- }
- }
-}
-
-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;
- }
- }
- UNW_DPRINT(0, "unwind.%s: excess spill!\n", __func__);
-}
-
-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) ARRAY_SIZE(unw.save_order); ++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;
- int 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(&regs[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, region_start;
-
- if (!(sr->in_body || sr->first_region))
- finish_prologue(sr);
- sr->first_region = 0;
-
- /* check if we're done: */
- if (sr->when_target < sr->region_start + sr->region_len) {
- sr->done = 1;
- return;
- }
-
- region_start = sr->region_start + sr->region_len;
-
- for (i = 0; i < sr->epilogue_count; ++i)
- pop(sr);
- sr->epilogue_count = 0;
- sr->epilogue_start = UNW_WHEN_NEVER;
-
- sr->region_start = region_start;
- sr->region_len = rlen;
- sr->in_body = body;
-
- if (!body) {
- push(sr);
-
- for (i = 0; i < 4; ++i) {
- if (mask & 0x8)
- set_reg(sr->curr.reg + unw.save_order[i], UNW_WHERE_GR,
- sr->region_start + sr->region_len - 1, grsave++);
- mask <<= 1;
- }
- sr->gr_save_loc = grsave;
- sr->any_spills = 0;
- sr->imask = NULL;
- sr->spill_offset = 0x10; /* default to psp+16 */
- }
-}
-
-/*
- * Prologue descriptors.
- */
-
-static inline void
-desc_abi (unsigned char abi, unsigned char context, struct unw_state_record *sr)
-{
- if (abi == 3 && context == 'i') {
- sr->flags |= UNW_FLAG_INTERRUPT_FRAME;
- UNW_DPRINT(3, "unwind.%s: interrupt frame\n", __func__);
- }
- else
- UNW_DPRINT(0, "unwind%s: ignoring unwabi(abi=0x%x,context=0x%x)\n",
- __func__, abi, context);
-}
-
-static inline void
-desc_br_gr (unsigned char brmask, unsigned char gr, struct unw_state_record *sr)
-{
- int i;
-
- for (i = 0; i < 5; ++i) {
- if (brmask & 1)
- set_reg(sr->curr.reg + UNW_REG_B1 + i, UNW_WHERE_GR,
- sr->region_start + sr->region_len - 1, gr++);
- brmask >>= 1;
- }
-}
-
-static inline void
-desc_br_mem (unsigned char brmask, struct unw_state_record *sr)
-{
- int i;
-
- for (i = 0; i < 5; ++i) {
- if (brmask & 1) {
- set_reg(sr->curr.reg + UNW_REG_B1 + i, UNW_WHERE_SPILL_HOME,
- sr->region_start + sr->region_len - 1, 0);
- sr->any_spills = 1;
- }
- brmask >>= 1;
- }
-}
-
-static inline void
-desc_frgr_mem (unsigned char grmask, unw_word frmask, struct unw_state_record *sr)
-{
- int i;
-
- for (i = 0; i < 4; ++i) {
- if ((grmask & 1) != 0) {
- set_reg(sr->curr.reg + UNW_REG_R4 + i, UNW_WHERE_SPILL_HOME,
- sr->region_start + sr->region_len - 1, 0);
- sr->any_spills = 1;
- }
- grmask >>= 1;
- }
- for (i = 0; i < 20; ++i) {
- if ((frmask & 1) != 0) {
- int base = (i < 4) ? UNW_REG_F2 : UNW_REG_F16 - 4;
- set_reg(sr->curr.reg + base + i, UNW_WHERE_SPILL_HOME,
- sr->region_start + sr->region_len - 1, 0);
- sr->any_spills = 1;
- }
- frmask >>= 1;
- }
-}
-
-static inline void
-desc_fr_mem (unsigned char frmask, struct unw_state_record *sr)
-{
- int i;
-
- for (i = 0; i < 4; ++i) {
- if ((frmask & 1) != 0) {
- set_reg(sr->curr.reg + UNW_REG_F2 + i, UNW_WHERE_SPILL_HOME,
- sr->region_start + sr->region_len - 1, 0);
- sr->any_spills = 1;
- }
- frmask >>= 1;
- }
-}
-
-static inline void
-desc_gr_gr (unsigned char grmask, unsigned char gr, struct unw_state_record *sr)
-{
- int i;
-
- for (i = 0; i < 4; ++i) {
- if ((grmask & 1) != 0)
- set_reg(sr->curr.reg + UNW_REG_R4 + i, UNW_WHERE_GR,
- sr->region_start + sr->region_len - 1, gr++);
- grmask >>= 1;
- }
-}
-
-static inline void
-desc_gr_mem (unsigned char grmask, struct unw_state_record *sr)
-{
- int i;
-
- for (i = 0; i < 4; ++i) {
- if ((grmask & 1) != 0) {
- set_reg(sr->curr.reg + UNW_REG_R4 + i, UNW_WHERE_SPILL_HOME,
- sr->region_start + sr->region_len - 1, 0);
- sr->any_spills = 1;
- }
- grmask >>= 1;
- }
-}
-
-static inline void
-desc_mem_stack_f (unw_word t, unw_word size, struct unw_state_record *sr)
-{
- set_reg(sr->curr.reg + UNW_REG_PSP, UNW_WHERE_NONE,
- sr->region_start + min_t(int, t, sr->region_len - 1), 16*size);
-}
-
-static inline void
-desc_mem_stack_v (unw_word t, struct unw_state_record *sr)
-{
- sr->curr.reg[UNW_REG_PSP].when = sr->region_start + min_t(int, t, sr->region_len - 1);
-}
-
-static inline void
-desc_reg_gr (unsigned char reg, unsigned char dst, struct unw_state_record *sr)
-{
- set_reg(sr->curr.reg + reg, UNW_WHERE_GR, sr->region_start + sr->region_len - 1, dst);
-}
-
-static inline void
-desc_reg_psprel (unsigned char reg, unw_word pspoff, struct unw_state_record *sr)
-{
- set_reg(sr->curr.reg + reg, UNW_WHERE_PSPREL, sr->region_start + sr->region_len - 1,
- 0x10 - 4*pspoff);
-}
-
-static inline void
-desc_reg_sprel (unsigned char reg, unw_word spoff, struct unw_state_record *sr)
-{
- set_reg(sr->curr.reg + reg, UNW_WHERE_SPREL, sr->region_start + sr->region_len - 1,
- 4*spoff);
-}
-
-static inline void
-desc_rp_br (unsigned char dst, struct unw_state_record *sr)
-{
- sr->return_link_reg = dst;
-}
-
-static inline void
-desc_reg_when (unsigned char regnum, unw_word t, struct unw_state_record *sr)
-{
- struct unw_reg_info *reg = sr->curr.reg + regnum;
-
- if (reg->where == UNW_WHERE_NONE)
- reg->where = UNW_WHERE_GR_SAVE;
- reg->when = sr->region_start + min_t(int, t, sr->region_len - 1);
-}
-
-static inline void
-desc_spill_base (unw_word pspoff, struct unw_state_record *sr)
-{
- sr->spill_offset = 0x10 - 4*pspoff;
-}
-
-static inline unsigned char *
-desc_spill_mask (unsigned char *imaskp, struct unw_state_record *sr)
-{
- sr->imask = imaskp;
- return imaskp + (2*sr->region_len + 7)/8;
-}
-
-/*
- * Body descriptors.
- */
-static inline void
-desc_epilogue (unw_word t, unw_word ecount, struct unw_state_record *sr)
-{
- sr->epilogue_start = sr->region_start + sr->region_len - 1 - t;
- sr->epilogue_count = ecount + 1;
-}
-
-static inline void
-desc_copy_state (unw_word label, struct unw_state_record *sr)
-{
- struct unw_labeled_state *ls;
-
- for (ls = sr->labeled_states; ls; ls = ls->next) {
- if (ls->label == label) {
- free_state_stack(&sr->curr);
- memcpy(&sr->curr, &ls->saved_state, sizeof(sr->curr));
- sr->curr.next = dup_state_stack(ls->saved_state.next);
- return;
- }
- }
- printk(KERN_ERR "unwind: failed to find state labeled 0x%lx\n", label);
-}
-
-static inline void
-desc_label_state (unw_word label, struct unw_state_record *sr)
-{
- struct unw_labeled_state *ls;
-
- ls = alloc_labeled_state();
- if (!ls) {
- printk(KERN_ERR "unwind.desc_label_state(): out of memory\n");
- return;
- }
- ls->label = label;
- memcpy(&ls->saved_state, &sr->curr, sizeof(ls->saved_state));
- ls->saved_state.next = dup_state_stack(sr->curr.next);
-
- /* insert into list of labeled states: */
- ls->next = sr->labeled_states;
- sr->labeled_states = ls;
-}
-
-/*
- * General descriptors.
- */
-
-static inline int
-desc_is_active (unsigned char qp, unw_word t, struct unw_state_record *sr)
-{
- if (sr->when_target <= sr->region_start + min_t(int, t, sr->region_len - 1))
- return 0;
- if (qp > 0) {
- if ((sr->pr_val & (1UL << qp)) == 0)
- return 0;
- sr->pr_mask |= (1UL << qp);
- }
- return 1;
-}
-
-static inline void
-desc_restore_p (unsigned char qp, unw_word t, unsigned char abreg, struct unw_state_record *sr)
-{
- struct unw_reg_info *r;
-
- if (!desc_is_active(qp, t, sr))
- return;
-
- r = sr->curr.reg + decode_abreg(abreg, 0);
- r->where = UNW_WHERE_NONE;
- r->when = UNW_WHEN_NEVER;
- r->val = 0;
-}
-
-static inline void
-desc_spill_reg_p (unsigned char qp, unw_word t, unsigned char abreg, unsigned char x,
- unsigned char ytreg, struct unw_state_record *sr)
-{
- enum unw_where where = UNW_WHERE_GR;
- struct unw_reg_info *r;
-
- if (!desc_is_active(qp, t, sr))
- return;
-
- if (x)
- where = UNW_WHERE_BR;
- else if (ytreg & 0x80)
- where = UNW_WHERE_FR;
-
- r = sr->curr.reg + decode_abreg(abreg, 0);
- r->where = where;
- r->when = sr->region_start + min_t(int, t, sr->region_len - 1);
- r->val = (ytreg & 0x7f);
-}
-
-static inline void
-desc_spill_psprel_p (unsigned char qp, unw_word t, unsigned char abreg, unw_word pspoff,
- struct unw_state_record *sr)
-{
- struct unw_reg_info *r;
-
- if (!desc_is_active(qp, t, sr))
- return;
-
- r = sr->curr.reg + decode_abreg(abreg, 1);
- r->where = UNW_WHERE_PSPREL;
- r->when = sr->region_start + min_t(int, t, sr->region_len - 1);
- r->val = 0x10 - 4*pspoff;
-}
-
-static inline void
-desc_spill_sprel_p (unsigned char qp, unw_word t, unsigned char abreg, unw_word spoff,
- struct unw_state_record *sr)
-{
- struct unw_reg_info *r;
-
- if (!desc_is_active(qp, t, sr))
- return;
-
- r = sr->curr.reg + decode_abreg(abreg, 1);
- r->where = UNW_WHERE_SPREL;
- r->when = sr->region_start + min_t(int, t, sr->region_len - 1);
- r->val = 4*spoff;
-}
-
-#define UNW_DEC_BAD_CODE(code) printk(KERN_ERR "unwind: unknown code 0x%02x\n", \
- code);
-
-/*
- * region headers:
- */
-#define UNW_DEC_PROLOGUE_GR(fmt,r,m,gr,arg) desc_prologue(0,r,m,gr,arg)
-#define UNW_DEC_PROLOGUE(fmt,b,r,arg) desc_prologue(b,r,0,32,arg)
-/*
- * prologue descriptors:
- */
-#define UNW_DEC_ABI(fmt,a,c,arg) desc_abi(a,c,arg)
-#define UNW_DEC_BR_GR(fmt,b,g,arg) desc_br_gr(b,g,arg)
-#define UNW_DEC_BR_MEM(fmt,b,arg) desc_br_mem(b,arg)
-#define UNW_DEC_FRGR_MEM(fmt,g,f,arg) desc_frgr_mem(g,f,arg)
-#define UNW_DEC_FR_MEM(fmt,f,arg) desc_fr_mem(f,arg)
-#define UNW_DEC_GR_GR(fmt,m,g,arg) desc_gr_gr(m,g,arg)
-#define UNW_DEC_GR_MEM(fmt,m,arg) desc_gr_mem(m,arg)
-#define UNW_DEC_MEM_STACK_F(fmt,t,s,arg) desc_mem_stack_f(t,s,arg)
-#define UNW_DEC_MEM_STACK_V(fmt,t,arg) desc_mem_stack_v(t,arg)
-#define UNW_DEC_REG_GR(fmt,r,d,arg) desc_reg_gr(r,d,arg)
-#define UNW_DEC_REG_PSPREL(fmt,r,o,arg) desc_reg_psprel(r,o,arg)
-#define UNW_DEC_REG_SPREL(fmt,r,o,arg) desc_reg_sprel(r,o,arg)
-#define UNW_DEC_REG_WHEN(fmt,r,t,arg) desc_reg_when(r,t,arg)
-#define UNW_DEC_PRIUNAT_WHEN_GR(fmt,t,arg) desc_reg_when(UNW_REG_PRI_UNAT_GR,t,arg)
-#define UNW_DEC_PRIUNAT_WHEN_MEM(fmt,t,arg) desc_reg_when(UNW_REG_PRI_UNAT_MEM,t,arg)
-#define UNW_DEC_PRIUNAT_GR(fmt,r,arg) desc_reg_gr(UNW_REG_PRI_UNAT_GR,r,arg)
-#define UNW_DEC_PRIUNAT_PSPREL(fmt,o,arg) desc_reg_psprel(UNW_REG_PRI_UNAT_MEM,o,arg)
-#define UNW_DEC_PRIUNAT_SPREL(fmt,o,arg) desc_reg_sprel(UNW_REG_PRI_UNAT_MEM,o,arg)
-#define UNW_DEC_RP_BR(fmt,d,arg) desc_rp_br(d,arg)
-#define UNW_DEC_SPILL_BASE(fmt,o,arg) desc_spill_base(o,arg)
-#define UNW_DEC_SPILL_MASK(fmt,m,arg) (m = desc_spill_mask(m,arg))
-/*
- * body descriptors:
- */
-#define UNW_DEC_EPILOGUE(fmt,t,c,arg) desc_epilogue(t,c,arg)
-#define UNW_DEC_COPY_STATE(fmt,l,arg) desc_copy_state(l,arg)
-#define UNW_DEC_LABEL_STATE(fmt,l,arg) desc_label_state(l,arg)
-/*
- * general unwind descriptors:
- */
-#define UNW_DEC_SPILL_REG_P(f,p,t,a,x,y,arg) desc_spill_reg_p(p,t,a,x,y,arg)
-#define UNW_DEC_SPILL_REG(f,t,a,x,y,arg) desc_spill_reg_p(0,t,a,x,y,arg)
-#define UNW_DEC_SPILL_PSPREL_P(f,p,t,a,o,arg) desc_spill_psprel_p(p,t,a,o,arg)
-#define UNW_DEC_SPILL_PSPREL(f,t,a,o,arg) desc_spill_psprel_p(0,t,a,o,arg)
-#define UNW_DEC_SPILL_SPREL_P(f,p,t,a,o,arg) desc_spill_sprel_p(p,t,a,o,arg)
-#define UNW_DEC_SPILL_SPREL(f,t,a,o,arg) desc_spill_sprel_p(0,t,a,o,arg)
-#define UNW_DEC_RESTORE_P(f,p,t,a,arg) desc_restore_p(p,t,a,arg)
-#define UNW_DEC_RESTORE(f,t,a,arg) desc_restore_p(0,t,a,arg)
-
-#include "unwind_decoder.c"
-
-
-/* Unwind scripts. */
-
-static inline unw_hash_index_t
-hash (unsigned long ip)
-{
- /* magic number = ((sqrt(5)-1)/2)*2^64 */
- static const unsigned long hashmagic = 0x9e3779b97f4a7c16UL;
-
- return (ip >> 4) * hashmagic >> (64 - UNW_LOG_HASH_SIZE);
-}
-
-static inline long
-cache_match (struct unw_script *script, unsigned long ip, unsigned long pr)
-{
- read_lock(&script->lock);
- if (ip == script->ip && ((pr ^ script->pr_val) & script->pr_mask) == 0)
- /* keep the read lock... */
- return 1;
- read_unlock(&script->lock);
- return 0;
-}
-
-static inline struct unw_script *
-script_lookup (struct unw_frame_info *info)
-{
- struct unw_script *script = unw.cache + info->hint;
- unsigned short index;
- unsigned long ip, pr;
-
- if (UNW_DEBUG_ON(0))
- return NULL; /* Always regenerate scripts in debug mode */
-
- STAT(++unw.stat.cache.lookups);
-
- ip = info->ip;
- pr = info->pr;
-
- if (cache_match(script, ip, pr)) {
- STAT(++unw.stat.cache.hinted_hits);
- return script;
- }
-
- index = unw.hash[hash(ip)];
- if (index >= UNW_CACHE_SIZE)
- return NULL;
-
- script = unw.cache + index;
- while (1) {
- if (cache_match(script, ip, pr)) {
- /* update hint; no locking required as single-word writes are atomic */
- STAT(++unw.stat.cache.normal_hits);
- unw.cache[info->prev_script].hint = script - unw.cache;
- return script;
- }
- if (script->coll_chain >= UNW_HASH_SIZE)
- return NULL;
- script = unw.cache + script->coll_chain;
- STAT(++unw.stat.cache.collision_chain_traversals);
- }
-}
-
-/*
- * On returning, a write lock for the SCRIPT is still being held.
- */
-static inline struct unw_script *
-script_new (unsigned long ip)
-{
- struct unw_script *script, *prev, *tmp;
- unw_hash_index_t index;
- unsigned short head;
-
- STAT(++unw.stat.script.news);
-
- /*
- * Can't (easily) use cmpxchg() here because of ABA problem
- * that is intrinsic in cmpxchg()...
- */
- head = unw.lru_head;
- script = unw.cache + head;
- unw.lru_head = script->lru_chain;
-
- /*
- * We'd deadlock here if we interrupted a thread that is holding a read lock on
- * script->lock. Thus, if the write_trylock() fails, we simply bail out. The
- * alternative would be to disable interrupts whenever we hold a read-lock, but
- * that seems silly.
- */
- if (!write_trylock(&script->lock))
- return NULL;
-
- /* re-insert script at the tail of the LRU chain: */
- unw.cache[unw.lru_tail].lru_chain = head;
- unw.lru_tail = head;
-
- /* remove the old script from the hash table (if it's there): */
- if (script->ip) {
- index = hash(script->ip);
- tmp = unw.cache + unw.hash[index];
- prev = NULL;
- while (1) {
- if (tmp == script) {
- if (prev)
- prev->coll_chain = tmp->coll_chain;
- else
- unw.hash[index] = tmp->coll_chain;
- break;
- } else
- prev = tmp;
- if (tmp->coll_chain >= UNW_CACHE_SIZE)
- /* old script wasn't in the hash-table */
- break;
- tmp = unw.cache + tmp->coll_chain;
- }
- }
-
- /* enter new script in the hash table */
- index = hash(ip);
- script->coll_chain = unw.hash[index];
- unw.hash[index] = script - unw.cache;
-
- script->ip = ip; /* set new IP while we're holding the locks */
-
- STAT(if (script->coll_chain < UNW_CACHE_SIZE) ++unw.stat.script.collisions);
-
- script->flags = 0;
- script->hint = 0;
- script->count = 0;
- return script;
-}
-
-static void
-script_finalize (struct unw_script *script, struct unw_state_record *sr)
-{
- script->pr_mask = sr->pr_mask;
- script->pr_val = sr->pr_val;
- /*
- * We could down-grade our write-lock on script->lock here but
- * the rwlock API doesn't offer atomic lock downgrading, so
- * we'll just keep the write-lock and release it later when
- * we're done using the script.
- */
-}
-
-static inline void
-script_emit (struct unw_script *script, struct unw_insn insn)
-{
- if (script->count >= UNW_MAX_SCRIPT_LEN) {
- UNW_DPRINT(0, "unwind.%s: script exceeds maximum size of %u instructions!\n",
- __func__, UNW_MAX_SCRIPT_LEN);
- return;
- }
- script->insn[script->count++] = insn;
-}
-
-static inline void
-emit_nat_info (struct unw_state_record *sr, int i, struct unw_script *script)
-{
- struct unw_reg_info *r = sr->curr.reg + i;
- enum unw_insn_opcode opc;
- struct unw_insn insn;
- unsigned long val = 0;
-
- switch (r->where) {
- case UNW_WHERE_GR:
- if (r->val >= 32) {
- /* register got spilled to a stacked register */
- opc = UNW_INSN_SETNAT_TYPE;
- val = UNW_NAT_REGSTK;
- } else
- /* register got spilled to a scratch register */
- opc = UNW_INSN_SETNAT_MEMSTK;
- break;
-
- case UNW_WHERE_FR:
- opc = UNW_INSN_SETNAT_TYPE;
- val = UNW_NAT_VAL;
- break;
-
- case UNW_WHERE_BR:
- opc = UNW_INSN_SETNAT_TYPE;
- val = UNW_NAT_NONE;
- break;
-
- case UNW_WHERE_PSPREL:
- case UNW_WHERE_SPREL:
- opc = UNW_INSN_SETNAT_MEMSTK;
- break;
-
- default:
- UNW_DPRINT(0, "unwind.%s: don't know how to emit nat info for where = %u\n",
- __func__, r->where);
- return;
- }
- insn.opc = opc;
- insn.dst = unw.preg_index[i];
- insn.val = val;
- script_emit(script, insn);
-}
-
-static void
-compile_reg (struct unw_state_record *sr, int i, struct unw_script *script)
-{
- struct unw_reg_info *r = sr->curr.reg + i;
- enum unw_insn_opcode opc;
- unsigned long val, rval;
- struct unw_insn insn;
- long need_nat_info;
-
- if (r->where == UNW_WHERE_NONE || r->when >= sr->when_target)
- return;
-
- opc = UNW_INSN_MOVE;
- val = rval = r->val;
- need_nat_info = (i >= UNW_REG_R4 && i <= UNW_REG_R7);
-
- switch (r->where) {
- case UNW_WHERE_GR:
- if (rval >= 32) {
- opc = UNW_INSN_MOVE_STACKED;
- val = rval - 32;
- } else if (rval >= 4 && rval <= 7) {
- if (need_nat_info) {
- opc = UNW_INSN_MOVE2;
- need_nat_info = 0;
- }
- val = unw.preg_index[UNW_REG_R4 + (rval - 4)];
- } else if (rval == 0) {
- opc = UNW_INSN_MOVE_CONST;
- val = 0;
- } else {
- /* register got spilled to a scratch register */
- opc = UNW_INSN_MOVE_SCRATCH;
- val = pt_regs_off(rval);
- }
- break;
-
- case UNW_WHERE_FR:
- if (rval <= 5)
- val = unw.preg_index[UNW_REG_F2 + (rval - 2)];
- else if (rval >= 16 && rval <= 31)
- val = unw.preg_index[UNW_REG_F16 + (rval - 16)];
- else {
- opc = UNW_INSN_MOVE_SCRATCH;
- if (rval <= 11)
- val = offsetof(struct pt_regs, f6) + 16*(rval - 6);
- else
- UNW_DPRINT(0, "unwind.%s: kernel may not touch f%lu\n",
- __func__, rval);
- }
- break;
-
- case UNW_WHERE_BR:
- if (rval >= 1 && rval <= 5)
- val = unw.preg_index[UNW_REG_B1 + (rval - 1)];
- else {
- opc = UNW_INSN_MOVE_SCRATCH;
- if (rval == 0)
- val = offsetof(struct pt_regs, b0);
- else if (rval == 6)
- val = offsetof(struct pt_regs, b6);
- else
- val = offsetof(struct pt_regs, b7);
- }
- break;
-
- case UNW_WHERE_SPREL:
- opc = UNW_INSN_ADD_SP;
- break;
-
- case UNW_WHERE_PSPREL:
- opc = UNW_INSN_ADD_PSP;
- break;
-
- default:
- UNW_DPRINT(0, "unwind%s: register %u has unexpected `where' value of %u\n",
- __func__, i, r->where);
- break;
- }
- insn.opc = opc;
- insn.dst = unw.preg_index[i];
- insn.val = val;
- script_emit(script, insn);
- if (need_nat_info)
- emit_nat_info(sr, i, script);
-
- if (i == UNW_REG_PSP) {
- /*
- * info->psp must contain the _value_ of the previous
- * sp, not it's save location. We get this by
- * dereferencing the value we just stored in
- * info->psp:
- */
- insn.opc = UNW_INSN_LOAD;
- insn.dst = insn.val = unw.preg_index[UNW_REG_PSP];
- script_emit(script, insn);
- }
-}
-
-static inline const struct unw_table_entry *
-lookup (struct unw_table *table, unsigned long rel_ip)
-{
- const struct unw_table_entry *e = NULL;
- unsigned long lo, hi, mid;
-
- /* do a binary search for right entry: */
- for (lo = 0, hi = table->length; lo < hi; ) {
- mid = (lo + hi) / 2;
- e = &table->array[mid];
- if (rel_ip < e->start_offset)
- hi = mid;
- else if (rel_ip >= e->end_offset)
- lo = mid + 1;
- else
- break;
- }
- if (rel_ip < e->start_offset || rel_ip >= e->end_offset)
- return NULL;
- return e;
-}
-
-/*
- * Build an unwind script that unwinds from state OLD_STATE to the
- * entrypoint of the function that called OLD_STATE.
- */
-static inline struct unw_script *
-build_script (struct unw_frame_info *info)
-{
- const struct unw_table_entry *e = NULL;
- struct unw_script *script = NULL;
- struct unw_labeled_state *ls, *next;
- unsigned long ip = info->ip;
- struct unw_state_record sr;
- struct unw_table *table, *prev;
- struct unw_reg_info *r;
- struct unw_insn insn;
- u8 *dp, *desc_end;
- u64 hdr;
- int i;
- STAT(unsigned long start, parse_start;)
-
- STAT(++unw.stat.script.builds; start = ia64_get_itc());
-
- /* build state record */
- memset(&sr, 0, sizeof(sr));
- for (r = sr.curr.reg; r < sr.curr.reg + UNW_NUM_REGS; ++r)
- r->when = UNW_WHEN_NEVER;
- sr.pr_val = info->pr;
-
- UNW_DPRINT(3, "unwind.%s: ip 0x%lx\n", __func__, ip);
- script = script_new(ip);
- if (!script) {
- UNW_DPRINT(0, "unwind.%s: failed to create unwind script\n", __func__);
- STAT(unw.stat.script.build_time += ia64_get_itc() - start);
- return NULL;
- }
- unw.cache[info->prev_script].hint = script - unw.cache;
-
- /* search the kernels and the modules' unwind tables for IP: */
-
- STAT(parse_start = ia64_get_itc());
-
- prev = NULL;
- for (table = unw.tables; table; table = table->next) {
- if (ip >= table->start && ip < table->end) {
- /*
- * Leave the kernel unwind table at the very front,
- * lest moving it breaks some assumption elsewhere.
- * Otherwise, move the matching table to the second
- * position in the list so that traversals can benefit
- * from commonality in backtrace paths.
- */
- if (prev && prev != unw.tables) {
- /* unw is safe - we're already spinlocked */
- prev->next = table->next;
- table->next = unw.tables->next;
- unw.tables->next = table;
- }
- e = lookup(table, ip - table->segment_base);
- break;
- }
- prev = table;
- }
- if (!e) {
- /* no info, return default unwinder (leaf proc, no mem stack, no saved regs) */
- UNW_DPRINT(1, "unwind.%s: no unwind info for ip=0x%lx (prev ip=0x%lx)\n",
- __func__, ip, unw.cache[info->prev_script].ip);
- sr.curr.reg[UNW_REG_RP].where = UNW_WHERE_BR;
- sr.curr.reg[UNW_REG_RP].when = -1;
- sr.curr.reg[UNW_REG_RP].val = 0;
- compile_reg(&sr, UNW_REG_RP, script);
- script_finalize(script, &sr);
- STAT(unw.stat.script.parse_time += ia64_get_itc() - parse_start);
- STAT(unw.stat.script.build_time += ia64_get_itc() - start);
- return script;
- }
-
- sr.when_target = (3*((ip & ~0xfUL) - (table->segment_base + e->start_offset))/16
- + (ip & 0xfUL));
- hdr = *(u64 *) (table->segment_base + e->info_offset);
- dp = (u8 *) (table->segment_base + e->info_offset + 8);
- desc_end = dp + 8*UNW_LENGTH(hdr);
-
- while (!sr.done && dp < desc_end)
- dp = unw_decode(dp, sr.in_body, &sr);
-
- if (sr.when_target > sr.epilogue_start) {
- /*
- * sp has been restored and all values on the memory stack below
- * psp also have been restored.
- */
- sr.curr.reg[UNW_REG_PSP].val = 0;
- sr.curr.reg[UNW_REG_PSP].where = UNW_WHERE_NONE;
- sr.curr.reg[UNW_REG_PSP].when = UNW_WHEN_NEVER;
- for (r = sr.curr.reg; r < sr.curr.reg + UNW_NUM_REGS; ++r)
- if ((r->where == UNW_WHERE_PSPREL && r->val <= 0x10)
- || r->where == UNW_WHERE_SPREL)
- {
- r->val = 0;
- r->where = UNW_WHERE_NONE;
- r->when = UNW_WHEN_NEVER;
- }
- }
-
- script->flags = sr.flags;
-
- /*
- * If RP did't get saved, generate entry for the return link
- * register.
- */
- if (sr.curr.reg[UNW_REG_RP].when >= sr.when_target) {
- sr.curr.reg[UNW_REG_RP].where = UNW_WHERE_BR;
- sr.curr.reg[UNW_REG_RP].when = -1;
- sr.curr.reg[UNW_REG_RP].val = sr.return_link_reg;
- UNW_DPRINT(1, "unwind.%s: using default for rp at ip=0x%lx where=%d val=0x%lx\n",
- __func__, ip, sr.curr.reg[UNW_REG_RP].where,
- sr.curr.reg[UNW_REG_RP].val);
- }
-
-#ifdef UNW_DEBUG
- UNW_DPRINT(1, "unwind.%s: state record for func 0x%lx, t=%u:\n",
- __func__, table->segment_base + e->start_offset, sr.when_target);
- for (r = sr.curr.reg; r < sr.curr.reg + UNW_NUM_REGS; ++r) {
- if (r->where != UNW_WHERE_NONE || r->when != UNW_WHEN_NEVER) {
- UNW_DPRINT(1, " %s <- ", unw.preg_name[r - sr.curr.reg]);
- switch (r->where) {
- case UNW_WHERE_GR: UNW_DPRINT(1, "r%lu", r->val); break;
- case UNW_WHERE_FR: UNW_DPRINT(1, "f%lu", r->val); break;
- case UNW_WHERE_BR: UNW_DPRINT(1, "b%lu", r->val); break;
- case UNW_WHERE_SPREL: UNW_DPRINT(1, "[sp+0x%lx]", r->val); break;
- case UNW_WHERE_PSPREL: UNW_DPRINT(1, "[psp+0x%lx]", r->val); break;
- case UNW_WHERE_NONE:
- UNW_DPRINT(1, "%s+0x%lx", unw.preg_name[r - sr.curr.reg], r->val);
- break;
-
- default:
- UNW_DPRINT(1, "BADWHERE(%d)", r->where);
- break;
- }
- UNW_DPRINT(1, "\t\t%d\n", r->when);
- }
- }
-#endif
-
- STAT(unw.stat.script.parse_time += ia64_get_itc() - parse_start);
-
- /* translate state record into unwinder instructions: */
-
- /*
- * First, set psp if we're dealing with a fixed-size frame;
- * subsequent instructions may depend on this value.
- */
- if (sr.when_target > sr.curr.reg[UNW_REG_PSP].when
- && (sr.curr.reg[UNW_REG_PSP].where == UNW_WHERE_NONE)
- && sr.curr.reg[UNW_REG_PSP].val != 0) {
- /* new psp is sp plus frame size */
- insn.opc = UNW_INSN_ADD;
- insn.dst = offsetof(struct unw_frame_info, psp)/8;
- insn.val = sr.curr.reg[UNW_REG_PSP].val; /* frame size */
- script_emit(script, insn);
- }
-
- /* determine where the primary UNaT is: */
- if (sr.when_target < sr.curr.reg[UNW_REG_PRI_UNAT_GR].when)
- i = UNW_REG_PRI_UNAT_MEM;
- else if (sr.when_target < sr.curr.reg[UNW_REG_PRI_UNAT_MEM].when)
- i = UNW_REG_PRI_UNAT_GR;
- else if (sr.curr.reg[UNW_REG_PRI_UNAT_MEM].when > sr.curr.reg[UNW_REG_PRI_UNAT_GR].when)
- i = UNW_REG_PRI_UNAT_MEM;
- else
- i = UNW_REG_PRI_UNAT_GR;
-
- compile_reg(&sr, i, script);
-
- for (i = UNW_REG_BSP; i < UNW_NUM_REGS; ++i)
- compile_reg(&sr, i, script);
-
- /* free labeled register states & stack: */
-
- STAT(parse_start = ia64_get_itc());
- for (ls = sr.labeled_states; ls; ls = next) {
- next = ls->next;
- free_state_stack(&ls->saved_state);
- free_labeled_state(ls);
- }
- free_state_stack(&sr.curr);
- STAT(unw.stat.script.parse_time += ia64_get_itc() - parse_start);
-
- script_finalize(script, &sr);
- STAT(unw.stat.script.build_time += ia64_get_itc() - start);
- return script;
-}
-
-/*
- * Apply the unwinding actions represented by OPS and update SR to
- * reflect the state that existed upon entry to the function that this
- * unwinder represents.
- */
-static inline void
-run_script (struct unw_script *script, struct unw_frame_info *state)
-{
- struct unw_insn *ip, *limit, next_insn;
- unsigned long opc, dst, val, off;
- unsigned long *s = (unsigned long *) state;
- STAT(unsigned long start;)
-
- STAT(++unw.stat.script.runs; start = ia64_get_itc());
- state->flags = script->flags;
- ip = script->insn;
- limit = script->insn + script->count;
- next_insn = *ip;
-
- while (ip++ < limit) {
- opc = next_insn.opc;
- dst = next_insn.dst;
- val = next_insn.val;
- next_insn = *ip;
-
- redo:
- switch (opc) {
- case UNW_INSN_ADD:
- s[dst] += val;
- break;
-
- case UNW_INSN_MOVE2:
- if (!s[val])
- goto lazy_init;
- s[dst+1] = s[val+1];
- s[dst] = s[val];
- break;
-
- case UNW_INSN_MOVE:
- if (!s[val])
- goto lazy_init;
- s[dst] = s[val];
- break;
-
- case UNW_INSN_MOVE_SCRATCH:
- if (state->pt) {
- s[dst] = (unsigned long) get_scratch_regs(state) + val;
- } else {
- s[dst] = 0;
- UNW_DPRINT(0, "unwind.%s: no state->pt, dst=%ld, val=%ld\n",
- __func__, dst, val);
- }
- break;
-
- case UNW_INSN_MOVE_CONST:
- if (val == 0)
- s[dst] = (unsigned long) &unw.r0;
- else {
- s[dst] = 0;
- UNW_DPRINT(0, "unwind.%s: UNW_INSN_MOVE_CONST bad val=%ld\n",
- __func__, val);
- }
- break;
-
-
- case UNW_INSN_MOVE_STACKED:
- s[dst] = (unsigned long) ia64_rse_skip_regs((unsigned long *)state->bsp,
- val);
- break;
-
- case UNW_INSN_ADD_PSP:
- s[dst] = state->psp + val;
- break;
-
- case UNW_INSN_ADD_SP:
- s[dst] = state->sp + val;
- break;
-
- case UNW_INSN_SETNAT_MEMSTK:
- if (!state->pri_unat_loc)
- state->pri_unat_loc = &state->sw->caller_unat;
- /* register off. is a multiple of 8, so the least 3 bits (type) are 0 */
- s[dst+1] = ((unsigned long) state->pri_unat_loc - s[dst]) | UNW_NAT_MEMSTK;
- break;
-
- case UNW_INSN_SETNAT_TYPE:
- s[dst+1] = val;
- break;
-
- case UNW_INSN_LOAD:
-#ifdef UNW_DEBUG
- if ((s[val] & (local_cpu_data->unimpl_va_mask | 0x7)) != 0
- || s[val] < TASK_SIZE)
- {
- UNW_DPRINT(0, "unwind.%s: rejecting bad psp=0x%lx\n",
- __func__, s[val]);
- break;
- }
-#endif
- s[dst] = *(unsigned long *) s[val];
- break;
- }
- }
- STAT(unw.stat.script.run_time += ia64_get_itc() - start);
- return;
-
- lazy_init:
- off = unw.sw_off[val];
- s[val] = (unsigned long) state->sw + off;
- if (off >= offsetof(struct switch_stack, r4) && off <= offsetof(struct switch_stack, r7))
- /*
- * We're initializing a general register: init NaT info, too. Note that
- * the offset is a multiple of 8 which gives us the 3 bits needed for
- * the type field.
- */
- s[val+1] = (offsetof(struct switch_stack, ar_unat) - off) | UNW_NAT_MEMSTK;
- goto redo;
-}
-
-static int
-find_save_locs (struct unw_frame_info *info)
-{
- int have_write_lock = 0;
- struct unw_script *scr;
- unsigned long flags = 0;
-
- if ((info->ip & (local_cpu_data->unimpl_va_mask | 0xf)) || info->ip < TASK_SIZE) {
- /* don't let obviously bad addresses pollute the cache */
- /* FIXME: should really be level 0 but it occurs too often. KAO */
- UNW_DPRINT(1, "unwind.%s: rejecting bad ip=0x%lx\n", __func__, info->ip);
- info->rp_loc = NULL;
- return -1;
- }
-
- scr = script_lookup(info);
- if (!scr) {
- spin_lock_irqsave(&unw.lock, flags);
- scr = build_script(info);
- if (!scr) {
- spin_unlock_irqrestore(&unw.lock, flags);
- UNW_DPRINT(0,
- "unwind.%s: failed to locate/build unwind script for ip %lx\n",
- __func__, info->ip);
- return -1;
- }
- have_write_lock = 1;
- }
- info->hint = scr->hint;
- info->prev_script = scr - unw.cache;
-
- run_script(scr, info);
-
- if (have_write_lock) {
- write_unlock(&scr->lock);
- spin_unlock_irqrestore(&unw.lock, flags);
- } else
- read_unlock(&scr->lock);
- return 0;
-}
-
-static int
-unw_valid(const struct unw_frame_info *info, unsigned long* p)
-{
- unsigned long loc = (unsigned long)p;
- return (loc >= info->regstk.limit && loc < info->regstk.top) ||
- (loc >= info->memstk.top && loc < info->memstk.limit);
-}
-
-int
-unw_unwind (struct unw_frame_info *info)
-{
- unsigned long prev_ip, prev_sp, prev_bsp;
- unsigned long ip, pr, num_regs;
- STAT(unsigned long start, flags;)
- int retval;
-
- STAT(local_irq_save(flags); ++unw.stat.api.unwinds; start = ia64_get_itc());
-
- prev_ip = info->ip;
- prev_sp = info->sp;
- prev_bsp = info->bsp;
-
- /* validate the return IP pointer */
- if (!unw_valid(info, info->rp_loc)) {
- /* FIXME: should really be level 0 but it occurs too often. KAO */
- UNW_DPRINT(1, "unwind.%s: failed to locate return link (ip=0x%lx)!\n",
- __func__, info->ip);
- STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
- return -1;
- }
- /* restore the ip */
- ip = info->ip = *info->rp_loc;
- if (ip < GATE_ADDR) {
- UNW_DPRINT(2, "unwind.%s: reached user-space (ip=0x%lx)\n", __func__, ip);
- STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
- return -1;
- }
-
- /* validate the previous stack frame pointer */
- if (!unw_valid(info, info->pfs_loc)) {
- UNW_DPRINT(0, "unwind.%s: failed to locate ar.pfs!\n", __func__);
- STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
- return -1;
- }
- /* restore the cfm: */
- info->cfm_loc = info->pfs_loc;
-
- /* restore the bsp: */
- pr = info->pr;
- num_regs = 0;
- if ((info->flags & UNW_FLAG_INTERRUPT_FRAME)) {
- info->pt = info->sp + 16;
- if ((pr & (1UL << PRED_NON_SYSCALL)) != 0)
- num_regs = *info->cfm_loc & 0x7f; /* size of frame */
- info->pfs_loc =
- (unsigned long *) (info->pt + offsetof(struct pt_regs, ar_pfs));
- UNW_DPRINT(3, "unwind.%s: interrupt_frame pt 0x%lx\n", __func__, info->pt);
- } else
- num_regs = (*info->cfm_loc >> 7) & 0x7f; /* size of locals */
- info->bsp = (unsigned long) ia64_rse_skip_regs((unsigned long *) info->bsp, -num_regs);
- if (info->bsp < info->regstk.limit || info->bsp > info->regstk.top) {
- UNW_DPRINT(0, "unwind.%s: bsp (0x%lx) out of range [0x%lx-0x%lx]\n",
- __func__, info->bsp, info->regstk.limit, info->regstk.top);
- STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
- return -1;
- }
-
- /* restore the sp: */
- info->sp = info->psp;
- if (info->sp < info->memstk.top || info->sp > info->memstk.limit) {
- UNW_DPRINT(0, "unwind.%s: sp (0x%lx) out of range [0x%lx-0x%lx]\n",
- __func__, info->sp, info->memstk.top, info->memstk.limit);
- STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
- return -1;
- }
-
- if (info->ip == prev_ip && info->sp == prev_sp && info->bsp == prev_bsp) {
- UNW_DPRINT(0, "unwind.%s: ip, sp, bsp unchanged; stopping here (ip=0x%lx)\n",
- __func__, ip);
- STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
- return -1;
- }
-
- /* as we unwind, the saved ar.unat becomes the primary unat: */
- info->pri_unat_loc = info->unat_loc;
-
- /* finally, restore the predicates: */
- unw_get_pr(info, &info->pr);
-
- retval = find_save_locs(info);
- STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
- return retval;
-}
-EXPORT_SYMBOL(unw_unwind);
-
-int
-unw_unwind_to_user (struct unw_frame_info *info)
-{
- unsigned long ip, sp, pr = info->pr;
-
- do {
- unw_get_sp(info, &sp);
- if ((long)((unsigned long)info->task + IA64_STK_OFFSET - sp)
- < IA64_PT_REGS_SIZE) {
- UNW_DPRINT(0, "unwind.%s: ran off the top of the kernel stack\n",
- __func__);
- break;
- }
- if (unw_is_intr_frame(info) &&
- (pr & (1UL << PRED_USER_STACK)))
- return 0;
- if (unw_get_pr (info, &pr) < 0) {
- unw_get_rp(info, &ip);
- UNW_DPRINT(0, "unwind.%s: failed to read "
- "predicate register (ip=0x%lx)\n",
- __func__, ip);
- return -1;
- }
- } while (unw_unwind(info) >= 0);
- unw_get_ip(info, &ip);
- UNW_DPRINT(0, "unwind.%s: failed to unwind to user-level (ip=0x%lx)\n",
- __func__, ip);
- return -1;
-}
-EXPORT_SYMBOL(unw_unwind_to_user);
-
-static void
-init_frame_info (struct unw_frame_info *info, struct task_struct *t,
- struct switch_stack *sw, unsigned long stktop)
-{
- unsigned long rbslimit, rbstop, stklimit;
- STAT(unsigned long start, flags;)
-
- STAT(local_irq_save(flags); ++unw.stat.api.inits; start = ia64_get_itc());
-
- /*
- * Subtle stuff here: we _could_ unwind through the switch_stack frame but we
- * don't want to do that because it would be slow as each preserved register would
- * have to be processed. Instead, what we do here is zero out the frame info and
- * start the unwind process at the function that created the switch_stack frame.
- * When a preserved value in switch_stack needs to be accessed, run_script() will
- * initialize the appropriate pointer on demand.
- */
- memset(info, 0, sizeof(*info));
-
- rbslimit = (unsigned long) t + IA64_RBS_OFFSET;
- stklimit = (unsigned long) t + IA64_STK_OFFSET;
-
- rbstop = sw->ar_bspstore;
- if (rbstop > stklimit || rbstop < rbslimit)
- rbstop = rbslimit;
-
- if (stktop <= rbstop)
- stktop = rbstop;
- if (stktop > stklimit)
- stktop = stklimit;
-
- info->regstk.limit = rbslimit;
- info->regstk.top = rbstop;
- info->memstk.limit = stklimit;
- info->memstk.top = stktop;
- info->task = t;
- info->sw = sw;
- info->sp = info->psp = stktop;
- info->pr = sw->pr;
- UNW_DPRINT(3, "unwind.%s:\n"
- " task 0x%lx\n"
- " rbs = [0x%lx-0x%lx)\n"
- " stk = [0x%lx-0x%lx)\n"
- " pr 0x%lx\n"
- " sw 0x%lx\n"
- " sp 0x%lx\n",
- __func__, (unsigned long) t, rbslimit, rbstop, stktop, stklimit,
- info->pr, (unsigned long) info->sw, info->sp);
- STAT(unw.stat.api.init_time += ia64_get_itc() - start; local_irq_restore(flags));
-}
-
-void
-unw_init_frame_info (struct unw_frame_info *info, struct task_struct *t, struct switch_stack *sw)
-{
- unsigned long sol;
-
- init_frame_info(info, t, sw, (unsigned long) (sw + 1) - 16);
- info->cfm_loc = &sw->ar_pfs;
- sol = (*info->cfm_loc >> 7) & 0x7f;
- info->bsp = (unsigned long) ia64_rse_skip_regs((unsigned long *) info->regstk.top, -sol);
- info->ip = sw->b0;
- UNW_DPRINT(3, "unwind.%s:\n"
- " bsp 0x%lx\n"
- " sol 0x%lx\n"
- " ip 0x%lx\n",
- __func__, info->bsp, sol, info->ip);
- find_save_locs(info);
-}
-
-EXPORT_SYMBOL(unw_init_frame_info);
-
-void
-unw_init_from_blocked_task (struct unw_frame_info *info, struct task_struct *t)
-{
- struct switch_stack *sw = (struct switch_stack *) (t->thread.ksp + 16);
-
- UNW_DPRINT(1, "unwind.%s\n", __func__);
- unw_init_frame_info(info, t, sw);
-}
-EXPORT_SYMBOL(unw_init_from_blocked_task);
-
-static void
-init_unwind_table (struct unw_table *table, const char *name, unsigned long segment_base,
- unsigned long gp, const void *table_start, const void *table_end)
-{
- const struct unw_table_entry *start = table_start, *end = table_end;
-
- table->name = name;
- table->segment_base = segment_base;
- table->gp = gp;
- table->start = segment_base + start[0].start_offset;
- table->end = segment_base + end[-1].end_offset;
- table->array = start;
- table->length = end - start;
-}
-
-void *
-unw_add_unwind_table (const char *name, unsigned long segment_base, unsigned long gp,
- const void *table_start, const void *table_end)
-{
- const struct unw_table_entry *start = table_start, *end = table_end;
- struct unw_table *table;
- unsigned long flags;
-
- if (end - start <= 0) {
- UNW_DPRINT(0, "unwind.%s: ignoring attempt to insert empty unwind table\n",
- __func__);
- return NULL;
- }
-
- table = kmalloc(sizeof(*table), GFP_USER);
- if (!table)
- return NULL;
-
- init_unwind_table(table, name, segment_base, gp, table_start, table_end);
-
- spin_lock_irqsave(&unw.lock, flags);
- {
- /* keep kernel unwind table at the front (it's searched most commonly): */
- table->next = unw.tables->next;
- unw.tables->next = table;
- }
- spin_unlock_irqrestore(&unw.lock, flags);
-
- return table;
-}
-
-void
-unw_remove_unwind_table (void *handle)
-{
- struct unw_table *table, *prev;
- struct unw_script *tmp;
- unsigned long flags;
- long index;
-
- if (!handle) {
- UNW_DPRINT(0, "unwind.%s: ignoring attempt to remove non-existent unwind table\n",
- __func__);
- return;
- }
-
- table = handle;
- if (table == &unw.kernel_table) {
- UNW_DPRINT(0, "unwind.%s: sorry, freeing the kernel's unwind table is a "
- "no-can-do!\n", __func__);
- return;
- }
-
- spin_lock_irqsave(&unw.lock, flags);
- {
- /* first, delete the table: */
-
- for (prev = (struct unw_table *) &unw.tables; prev; prev = prev->next)
- if (prev->next == table)
- break;
- if (!prev) {
- UNW_DPRINT(0, "unwind.%s: failed to find unwind table %p\n",
- __func__, (void *) table);
- spin_unlock_irqrestore(&unw.lock, flags);
- return;
- }
- prev->next = table->next;
- }
- spin_unlock_irqrestore(&unw.lock, flags);
-
- /* next, remove hash table entries for this table */
-
- for (index = 0; index < UNW_HASH_SIZE; ++index) {
- tmp = unw.cache + unw.hash[index];
- if (unw.hash[index] >= UNW_CACHE_SIZE
- || tmp->ip < table->start || tmp->ip >= table->end)
- continue;
-
- write_lock(&tmp->lock);
- {
- if (tmp->ip >= table->start && tmp->ip < table->end) {
- unw.hash[index] = tmp->coll_chain;
- tmp->ip = 0;
- }
- }
- write_unlock(&tmp->lock);
- }
-
- kfree(table);
-}
-
-static int __init
-create_gate_table (void)
-{
- const struct unw_table_entry *entry, *start, *end;
- unsigned long *lp, segbase = GATE_ADDR;
- size_t info_size, size;
- char *info;
- Elf64_Phdr *punw = NULL, *phdr = (Elf64_Phdr *) (GATE_ADDR + GATE_EHDR->e_phoff);
- int i;
-
- for (i = 0; i < GATE_EHDR->e_phnum; ++i, ++phdr)
- if (phdr->p_type == PT_IA_64_UNWIND) {
- punw = phdr;
- break;
- }
-
- if (!punw) {
- printk("%s: failed to find gate DSO's unwind table!\n", __func__);
- return 0;
- }
-
- start = (const struct unw_table_entry *) punw->p_vaddr;
- end = (struct unw_table_entry *) ((char *) start + punw->p_memsz);
- size = 0;
-
- unw_add_unwind_table("linux-gate.so", segbase, 0, start, end);
-
- for (entry = start; entry < end; ++entry)
- size += 3*8 + 8 + 8*UNW_LENGTH(*(u64 *) (segbase + entry->info_offset));
- size += 8; /* reserve space for "end of table" marker */
-
- unw.gate_table = kmalloc(size, GFP_KERNEL);
- if (!unw.gate_table) {
- unw.gate_table_size = 0;
- printk(KERN_ERR "%s: unable to create unwind data for gate page!\n", __func__);
- return 0;
- }
- unw.gate_table_size = size;
-
- lp = unw.gate_table;
- info = (char *) unw.gate_table + size;
-
- for (entry = start; entry < end; ++entry, lp += 3) {
- info_size = 8 + 8*UNW_LENGTH(*(u64 *) (segbase + entry->info_offset));
- info -= info_size;
- memcpy(info, (char *) segbase + entry->info_offset, info_size);
-
- lp[0] = segbase + entry->start_offset; /* start */
- lp[1] = segbase + entry->end_offset; /* end */
- lp[2] = info - (char *) unw.gate_table; /* info */
- }
- *lp = 0; /* end-of-table marker */
- return 0;
-}
-
-__initcall(create_gate_table);
-
-void __init
-unw_init (void)
-{
- extern char __gp[];
- extern void unw_hash_index_t_is_too_narrow (void);
- long i, off;
-
- if (8*sizeof(unw_hash_index_t) < UNW_LOG_HASH_SIZE)
- unw_hash_index_t_is_too_narrow();
-
- unw.sw_off[unw.preg_index[UNW_REG_PRI_UNAT_GR]] = SW(CALLER_UNAT);
- unw.sw_off[unw.preg_index[UNW_REG_BSPSTORE]] = SW(AR_BSPSTORE);
- unw.sw_off[unw.preg_index[UNW_REG_PFS]] = SW(AR_PFS);
- unw.sw_off[unw.preg_index[UNW_REG_RP]] = SW(B0);
- unw.sw_off[unw.preg_index[UNW_REG_UNAT]] = SW(CALLER_UNAT);
- unw.sw_off[unw.preg_index[UNW_REG_PR]] = SW(PR);
- unw.sw_off[unw.preg_index[UNW_REG_LC]] = SW(AR_LC);
- unw.sw_off[unw.preg_index[UNW_REG_FPSR]] = SW(AR_FPSR);
- for (i = UNW_REG_R4, off = SW(R4); i <= UNW_REG_R7; ++i, off += 8)
- unw.sw_off[unw.preg_index[i]] = off;
- for (i = UNW_REG_B1, off = SW(B1); i <= UNW_REG_B5; ++i, off += 8)
- unw.sw_off[unw.preg_index[i]] = off;
- for (i = UNW_REG_F2, off = SW(F2); i <= UNW_REG_F5; ++i, off += 16)
- unw.sw_off[unw.preg_index[i]] = off;
- for (i = UNW_REG_F16, off = SW(F16); i <= UNW_REG_F31; ++i, off += 16)
- unw.sw_off[unw.preg_index[i]] = off;
-
- for (i = 0; i < UNW_CACHE_SIZE; ++i) {
- if (i > 0)
- unw.cache[i].lru_chain = (i - 1);
- unw.cache[i].coll_chain = -1;
- rwlock_init(&unw.cache[i].lock);
- }
- unw.lru_head = UNW_CACHE_SIZE - 1;
- unw.lru_tail = 0;
-
- init_unwind_table(&unw.kernel_table, "kernel", KERNEL_START, (unsigned long) __gp,
- __start_unwind, __end_unwind);
-}
-
-/*
- * DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED
- *
- * This system call has been deprecated. The new and improved way to get
- * at the kernel's unwind info is via the gate DSO. The address of the
- * ELF header for this DSO is passed to user-level via AT_SYSINFO_EHDR.
- *
- * DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED DEPRECATED
- *
- * This system call copies the unwind data into the buffer pointed to by BUF and returns
- * the size of the unwind data. If BUF_SIZE is smaller than the size of the unwind data
- * or if BUF is NULL, nothing is copied, but the system call still returns the size of the
- * unwind data.
- *
- * The first portion of the unwind data contains an unwind table and rest contains the
- * associated unwind info (in no particular order). The unwind table consists of a table
- * of entries of the form:
- *
- * u64 start; (64-bit address of start of function)
- * u64 end; (64-bit address of start of function)
- * u64 info; (BUF-relative offset to unwind info)
- *
- * The end of the unwind table is indicated by an entry with a START address of zero.
- *
- * Please see the IA-64 Software Conventions and Runtime Architecture manual for details
- * on the format of the unwind info.
- *
- * ERRORS
- * EFAULT BUF points outside your accessible address space.
- */
-asmlinkage long
-sys_getunwind (void __user *buf, size_t buf_size)
-{
- if (buf && buf_size >= unw.gate_table_size)
- if (copy_to_user(buf, unw.gate_table, unw.gate_table_size) != 0)
- return -EFAULT;
- return unw.gate_table_size;
-}
generated by cgit (git 2.34.1) at 2024-05-08 06:45:03 +0000