new file mode 100644
@@ -0,0 +1,128 @@
+/* libunwind - a platform-independent unwind library
+ Copyright 2011 Linaro Limited
+
+This file is part of libunwind.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
+
+#ifndef ARM_EX_TABLES_H
+#define ARM_EX_TABLES_H
+
+struct arm_exidx_entry {
+ uint32_t addr;
+ uint32_t data;
+};
+
+struct arm_exidx_table {
+ const char *name;
+ struct arm_exidx_entry *start;
+ struct arm_exidx_entry *end;
+ void *start_addr;
+ void *end_addr;
+#ifdef ARM_EXIDX_TABLE_MALLOC
+ struct arm_exidx_table *next;
+#endif
+};
+
+
+typedef enum arm_exbuf_cmd {
+ ARM_EXIDX_CMD_FINISH,
+ ARM_EXIDX_CMD_DATA_PUSH,
+ ARM_EXIDX_CMD_DATA_POP,
+ ARM_EXIDX_CMD_REG_POP,
+ ARM_EXIDX_CMD_REG_TO_SP,
+ ARM_EXIDX_CMD_VFP_POP,
+ ARM_EXIDX_CMD_WREG_POP,
+ ARM_EXIDX_CMD_WCGR_POP,
+ ARM_EXIDX_CMD_RESERVED,
+ ARM_EXIDX_CMD_REFUSED,
+} arm_exbuf_cmd_t;
+
+enum arm_exbuf_cmd_flags {
+ ARM_EXIDX_VFP_SHIFT_16 = 1 << 16,
+ ARM_EXIDX_VFP_DOUBLE = 1 << 17,
+};
+
+#define ARM_EXBUF_START(x) (((x) >> 4) & 0x0f)
+#define ARM_EXBUF_COUNT(x) ((x) & 0x0f)
+#define ARM_EXBUF_END(x) (ARM_EXBUF_START(x) + ARM_EXBUF_COUNT(x))
+
+struct arm_exbuf_callback_data {
+ uint8_t ops[11];
+ uint8_t n_ops;
+ arm_exbuf_cmd_t cmd;
+ uint32_t data;
+ void *cb_data;
+};
+
+typedef int (*arm_exbuf_callback_t)(struct arm_exbuf_callback_data *aecb);
+
+static inline void *
+prel31_to_addr (void *addr)
+{
+ uint32_t offset = ((long)*(uint32_t *)addr << 1) >> 1;
+ return (char *)addr + offset;
+}
+
+int arm_exidx_init_local (const char *appname);
+
+int arm_exidx_table_add (const char *name,
+ struct arm_exidx_entry *start, struct arm_exidx_entry *end);
+struct arm_exidx_table *arm_exidx_table_find (void *pc);
+struct arm_exidx_entry *arm_exidx_table_lookup (
+ struct arm_exidx_table *table, void *pc);
+
+void arm_exidx_section_find (struct elf_image *ei,
+ Elf_W (Shdr) **exidx, Elf_W (Shdr) **extbl);
+int arm_exidx_entry_lookup (struct elf_image *ei,
+ Elf_W (Shdr) *exidx, uint32_t ip);
+int arm_exidx_entry_extract (struct elf_image *ei,
+ Elf_W (Shdr) *exidx, Elf_W (Shdr) *extbl,
+ unsigned i, uint8_t *buf);
+int arm_exidx_extract (struct arm_exidx_entry *entry, uint8_t *buf);
+
+int arm_exidx_decode (const uint8_t *buf, uint8_t len,
+ arm_exbuf_callback_t cb, void *cb_data);
+
+struct arm_stackframe {
+ void *fp;
+ void *sp;
+ void *lr;
+ void *pc;
+};
+
+struct arm_exidx_vrs {
+ uint32_t vrs[16];
+};
+
+enum arm_exidx_vrs_regs {
+ FP_thumb = 7,
+ FP_arm = 11,
+ SP = 13,
+ LR = 14,
+ PC = 15,
+};
+
+void arm_exidx_frame_to_vrs(struct arm_stackframe *f, struct arm_exidx_vrs *s);
+int arm_exidx_vrs_to_frame(struct arm_exidx_vrs *s, struct arm_stackframe *f);
+
+int arm_exidx_vrs_callback (struct arm_exbuf_callback_data *aecd);
+
+#endif // ARM_EX_TABLES_H
@@ -34,6 +34,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#include "elf32.h"
#include "mempool.h"
#include "dwarf.h"
+#include "ex_tables.h"
struct unw_addr_space
{
@@ -54,6 +55,7 @@ struct unw_addr_space
struct cursor
{
struct dwarf_cursor dwarf; /* must be first */
+ struct arm_stackframe frame;
unw_word_t sigcontext_addr;
};
@@ -137,7 +137,8 @@ libunwind_la_LIBADD += $(LIBUNWIND_ELF)
# The list of files that go into libunwind and libunwind-arm:
noinst_HEADERS += arm/init.h arm/offsets.h arm/unwind_i.h
libunwind_la_SOURCES_arm_common = $(libunwind_la_SOURCES_common) \
- arm/is_fpreg.c arm/regname.c
+ arm/is_fpreg.c arm/regname.c \
+ arm/ex_tables.c arm/ex_tables.h
# The list of files that go into libunwind:
libunwind_la_SOURCES_arm = $(libunwind_la_SOURCES_arm_common) \
new file mode 100644
@@ -0,0 +1,600 @@
+/* libunwind - a platform-independent unwind library
+ Copyright 2011 Linaro Limited
+
+This file is part of libunwind.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
+
+#include "libunwind_i.h"
+
+#define ARM_EXIDX_CANT_UNWIND 0x00000001
+#define ARM_EXIDX_COMPACT 0x80000000
+
+#define ARM_EXTBL_OP_FINISH 0xb0
+
+#ifdef ARM_EXIDX_TABLE_MALLOC
+static struct arm_exidx_table *arm_exidx_table_list;
+#else
+#define ARM_EXIDX_TABLE_LIMIT 32
+static struct arm_exidx_table arm_exidx_tables[ARM_EXIDX_TABLE_LIMIT];
+static unsigned arm_exidx_table_count = 0;
+#endif
+static const char *arm_exidx_appname;
+
+static void
+arm_exidx_table_reset_all (void)
+{
+#ifdef ARM_EXIDX_TABLE_MALLOC
+ while (NULL != arm_exidx_table_list)
+ {
+ struct arm_exidx_table *next = arm_exidx_table_list->next;
+ free (arm_exidx_table_list);
+ arm_exidx_table_list = next;
+ }
+#else
+ arm_exidx_table_count = 0;
+#endif
+}
+
+HIDDEN int
+arm_exidx_table_add (const char *name,
+ struct arm_exidx_entry *start, struct arm_exidx_entry *end)
+{
+#ifdef ARM_EXIDX_TABLE_MALLOC
+ struct arm_exidx_table *table = malloc (sizeof (*table));
+ if (NULL == table)
+ return -1;
+ table->next = arm_exidx_table_list;
+ arm_exidx_table_list = table;
+#else
+ if (arm_exidx_table_count >= ARM_EXIDX_TABLE_LIMIT)
+ return -1;
+ struct arm_exidx_table *table = &arm_exidx_tables[arm_exidx_table_count++];
+#endif
+ table->name = name;
+ table->start = start;
+ table->end = end;
+ table->start_addr = prel31_to_addr (&start->addr);
+ table->end_addr = prel31_to_addr (&(end - 1)->addr);
+ Debug (2, "name=%s, range=%p-%p, addr=%p-%p\n",
+ name, start, end, table->start_addr, table->end_addr);
+ return 0;
+}
+
+/**
+ * Located the appropriate unwind table
+ */
+HIDDEN struct arm_exidx_table *
+arm_exidx_table_find (void *pc)
+{
+ struct arm_exidx_table *table;
+#ifdef ARM_EXIDX_TABLE_MALLOC
+ for (table = arm_exidx_table_list; table != NULL; table = table->next)
+ {
+#else
+ unsigned i;
+ for (i = 0; i < arm_exidx_table_count; i++)
+ {
+ table = &arm_exidx_tables[i];
+#endif
+ if (pc >= table->start_addr && pc < table->end_addr)
+ return table;
+ }
+ return NULL;
+}
+
+/* Based on Linux arm/arm/kernel/unwind.c:search_index() */
+HIDDEN struct arm_exidx_entry *
+arm_exidx_table_lookup (struct arm_exidx_table *table, void *pc)
+{
+ struct arm_exidx_entry *first = table->start, *last = table->end - 1;
+ if (pc < prel31_to_addr (&first->addr))
+ return NULL;
+ else if (pc >= prel31_to_addr (&last->addr))
+ return last;
+ while (first < last - 1)
+ {
+ struct arm_exidx_entry *mid = first + ((last - first + 1) >> 1);
+ if (pc < prel31_to_addr (&mid->addr))
+ last = mid;
+ else
+ first = mid;
+ }
+ return first;
+}
+
+static inline int
+arm_exidx_frame_reg(void *pc)
+{
+ return ((unsigned)pc & 1) ? FP_thumb : FP_arm;
+}
+
+HIDDEN void
+arm_exidx_frame_to_vrs(struct arm_stackframe *f, struct arm_exidx_vrs *s)
+{
+ int fp_reg = arm_exidx_frame_reg(f->pc);
+ s->vrs[fp_reg] = (uint32_t)f->fp;
+ s->vrs[SP] = (uint32_t)f->sp;
+ s->vrs[LR] = (uint32_t)f->lr;
+ s->vrs[PC] = 0;
+}
+
+HIDDEN int
+arm_exidx_vrs_to_frame(struct arm_exidx_vrs *s, struct arm_stackframe *f)
+{
+ if (s->vrs[PC] == 0)
+ s->vrs[PC] = s->vrs[LR];
+
+ if (f->pc == (void *)s->vrs[PC])
+ return -1;
+
+ int fp_reg = arm_exidx_frame_reg(f->pc);
+ f->fp = (void *)s->vrs[fp_reg];
+ f->sp = (void *)s->vrs[SP];
+ f->lr = (void *)s->vrs[LR];
+ f->pc = (void *)s->vrs[PC];
+
+ return 0;
+}
+
+HIDDEN int
+arm_exidx_vrs_callback (struct arm_exbuf_callback_data *aecd)
+{
+ struct arm_exidx_vrs *s = aecd->cb_data;
+ int ret = 0, i;
+ switch (aecd->cmd)
+ {
+ case ARM_EXIDX_CMD_FINISH:
+ break;
+ case ARM_EXIDX_CMD_DATA_PUSH:
+ Debug (2, "vsp = vsp - %d\n", aecd->data);
+ s->vrs[SP] -= aecd->data;
+ break;
+ case ARM_EXIDX_CMD_DATA_POP:
+ Debug (2, "vsp = vsp + %d\n", aecd->data);
+ s->vrs[SP] += aecd->data;
+ break;
+ case ARM_EXIDX_CMD_REG_POP:
+ for (i = 0; i < 16; i++)
+ if (aecd->data & (1 << i))
+ {
+ s->vrs[i] = *(uint32_t*)s->vrs[SP];
+ s->vrs[SP] += 4;
+ Debug (2, "pop {r%d}\n", i);
+ }
+ break;
+ case ARM_EXIDX_CMD_REG_TO_SP:
+ assert (aecd->data < 16);
+ Debug (2, "vsp = r%d\n", aecd->data);
+ s->vrs[SP] = s->vrs[aecd->data];
+ break;
+ case ARM_EXIDX_CMD_VFP_POP:
+ /* Skip VFP registers, but be sure to adjust stack */
+ for (i = ARM_EXBUF_START (aecd->data); i < ARM_EXBUF_END (aecd->data); i++)
+ s->vrs[SP] += 8;
+ if (!(aecd->data & ARM_EXIDX_VFP_DOUBLE))
+ s->vrs[SP] += 4;
+ break;
+ case ARM_EXIDX_CMD_WREG_POP:
+ for (i = ARM_EXBUF_START (aecd->data); i < ARM_EXBUF_END (aecd->data); i++)
+ s->vrs[SP] += 8;
+ break;
+ case ARM_EXIDX_CMD_WCGR_POP:
+ for (i = 0; i < 4; i++)
+ if (aecd->data & (1 << i))
+ s->vrs[SP] += 4;
+ break;
+ case ARM_EXIDX_CMD_REFUSED:
+ case ARM_EXIDX_CMD_RESERVED:
+ ret = -1;
+ break;
+ }
+ return ret;
+}
+
+HIDDEN int
+arm_exidx_decode (const uint8_t *buf, uint8_t len,
+ arm_exbuf_callback_t cb, void *cb_data)
+{
+#define READ_OP() aecb.ops[aecb.n_ops++] = *buf++
+ const uint8_t *end = buf + len;
+ int ret;
+
+ assert(buf != NULL);
+ assert(cb != NULL);
+ while (buf < end)
+ {
+ struct arm_exbuf_callback_data aecb = { .cb_data = cb_data };
+ uint8_t op = READ_OP ();
+ if ((op & 0xc0) == 0x00)
+ {
+ aecb.cmd = ARM_EXIDX_CMD_DATA_POP;
+ aecb.data = (((int)op & 0x3f) << 2) + 4;
+ }
+ else if ((op & 0xc0) == 0x40)
+ {
+ aecb.cmd = ARM_EXIDX_CMD_DATA_PUSH;
+ aecb.data = (((int)op & 0x3f) << 2) + 4;
+ }
+ else if ((op & 0xf0) == 0x80)
+ {
+ uint8_t op2 = READ_OP ();
+ if (op == 0x80 && op2 == 0x00)
+ aecb.cmd = ARM_EXIDX_CMD_REFUSED;
+ else
+ {
+ aecb.cmd = ARM_EXIDX_CMD_REG_POP;
+ aecb.data = ((op & 0xf) << 8) | op2;
+ aecb.data = aecb.data << 4;
+ }
+ }
+ else if ((op & 0xf0) == 0x90)
+ {
+ if (op == 0x9d || op == 0x9f)
+ aecb.cmd = ARM_EXIDX_CMD_RESERVED;
+ else
+ {
+ aecb.cmd = ARM_EXIDX_CMD_REG_TO_SP;
+ aecb.data = op & 0x0f;
+ }
+ }
+ else if ((op & 0xf0) == 0xa0)
+ {
+ unsigned end = (op & 0x07);
+ aecb.data = (1 << (end + 1)) - 1;
+ aecb.data = aecb.data << 4;
+ if (op & 0x08)
+ aecb.data |= 1 << 14;
+ aecb.cmd = ARM_EXIDX_CMD_REG_POP;
+ }
+ else if (op == ARM_EXTBL_OP_FINISH)
+ {
+ aecb.cmd = ARM_EXIDX_CMD_FINISH;
+ buf = end;
+ }
+ else if (op == 0xb1)
+ {
+ uint8_t op2 = READ_OP ();
+ if (op2 == 0 || (op2 & 0xf0))
+ aecb.cmd = ARM_EXIDX_CMD_RESERVED;
+ else
+ {
+ aecb.cmd = ARM_EXIDX_CMD_REG_POP;
+ aecb.data = op2 & 0x0f;
+ }
+ }
+ else if (op == 0xb2)
+ {
+ uint32_t offset = 0;
+ uint8_t byte, shift = 0;
+ do
+ {
+ byte = READ_OP ();
+ offset |= (byte & 0x7f) << shift;
+ shift += 7;
+ }
+ while (byte & 0x80);
+ aecb.data = offset * 4 + 0x204;
+ aecb.cmd = ARM_EXIDX_CMD_DATA_POP;
+ }
+ else if (op == 0xb3 || op == 0xc8 || op == 0xc9)
+ {
+ aecb.cmd = ARM_EXIDX_CMD_VFP_POP;
+ aecb.data = READ_OP ();
+ if (op == 0xc8)
+ aecb.data |= ARM_EXIDX_VFP_SHIFT_16;
+ if (op != 0xb3)
+ aecb.data |= ARM_EXIDX_VFP_DOUBLE;
+ }
+ else if ((op & 0xf8) == 0xb8 || (op & 0xf8) == 0xd0)
+ {
+ aecb.cmd = ARM_EXIDX_CMD_VFP_POP;
+ aecb.data = 0x80 | (op & 0x07);
+ if ((op & 0xf8) == 0xd0)
+ aecb.data |= ARM_EXIDX_VFP_DOUBLE;
+ }
+ else if (op >= 0xc0 && op <= 0xc5)
+ {
+ aecb.cmd = ARM_EXIDX_CMD_WREG_POP;
+ aecb.data = 0xa0 | (op & 0x07);
+ }
+ else if (op == 0xc6)
+ {
+ aecb.cmd = ARM_EXIDX_CMD_WREG_POP;
+ aecb.data = READ_OP ();
+ }
+ else if (op == 0xc7)
+ {
+ uint8_t op2 = READ_OP ();
+ if (op2 == 0 || (op2 & 0xf0))
+ aecb.cmd = ARM_EXIDX_CMD_RESERVED;
+ else
+ {
+ aecb.cmd = ARM_EXIDX_CMD_WCGR_POP;
+ aecb.data = op2 & 0x0f;
+ }
+ }
+ else
+ aecb.cmd = ARM_EXIDX_CMD_RESERVED;
+
+ ret = (*cb) (&aecb);
+ if (ret < 0)
+ return ret;
+ }
+ return 0;
+}
+
+static inline uint32_t
+prel31_read (uint32_t prel31)
+{
+ return ((int32_t)prel31 << 1) >> 1;
+}
+
+/**
+ * Finds the index of the table entry for the given address
+ * using a binary search.
+ * @returns The table index (or -1 if not found).
+ */
+HIDDEN int
+arm_exidx_lookup (uint32_t *exidx_data, uint32_t exidx_size, uint32_t ip)
+{
+ unsigned lo = 0, hi = exidx_size / 8;
+ while (lo < hi)
+ {
+ unsigned mid = (lo + hi) / 2;
+ uint32_t base = (uint32_t)(exidx_data + mid * 2);
+ uint32_t addr = base + prel31_read (exidx_data[mid * 2]);
+ if (ip < addr)
+ hi = mid;
+ else
+ lo = mid + 1;
+ }
+ return hi - 1;
+}
+
+HIDDEN int
+arm_exidx_entry_lookup (struct elf_image *ei,
+ Elf_W (Shdr) *exidx, uint32_t ip)
+{
+#if 1
+ return arm_exidx_lookup (ei->image + exidx->sh_offset, exidx->sh_size, ip);
+#else
+ unsigned n_entries = exidx->sh_size / 8;
+ uint32_t *exidx_data = ei->image + exidx->sh_offset;
+ unsigned lo = 0, hi = n_entries;
+
+ while (lo < hi)
+ {
+ unsigned mid = (lo + hi) / 2;
+ uint32_t base = exidx->sh_addr + mid * 8;
+ uint32_t addr = base + prel31_read (exidx_data[mid * 2]);
+ if (ip < addr)
+ hi = mid;
+ else
+ lo = mid + 1;
+ }
+ return hi - 1;
+#endif
+}
+
+HIDDEN int
+arm_exidx_extract (struct arm_exidx_entry *entry, uint8_t *buf)
+{
+ int nbuf = 0;
+ uint32_t *addr = prel31_to_addr (&entry->addr);
+
+ uint32_t data = entry->data;
+ if (data == ARM_EXIDX_CANT_UNWIND)
+ {
+ Debug (2, "0x1 [can't unwind]\n");
+ nbuf = -UNW_ESTOPUNWIND;
+ }
+ else if (data & ARM_EXIDX_COMPACT)
+ {
+ Debug (2, "%p compact model %d [%8.8x]\n", addr, (data >> 24) & 0x7f, data);
+ buf[nbuf++] = data >> 16;
+ buf[nbuf++] = data >> 8;
+ buf[nbuf++] = data;
+ }
+ else
+ {
+ uint32_t *extbl_data = prel31_to_addr (&entry->data);
+ data = extbl_data[0];
+ unsigned int n_table_words = 0;
+ if (data & ARM_EXIDX_COMPACT)
+ {
+ int pers = (data >> 24) & 0x0f;
+ Debug (2, "%p compact model %d [%8.8x]\n", addr, pers, data);
+ if (pers == 1 || pers == 2)
+ {
+ n_table_words = (data >> 16) & 0xff;
+ extbl_data += 1;
+ }
+ else
+ buf[nbuf++] = data >> 16;
+ buf[nbuf++] = data >> 8;
+ buf[nbuf++] = data;
+ }
+ else
+ {
+ void *pers = prel31_to_addr (extbl_data);
+ Debug (2, "%p Personality routine: %8.8x\n", addr, pers);
+ n_table_words = extbl_data[1] >> 24;
+ buf[nbuf++] = extbl_data[1] >> 16;
+ buf[nbuf++] = extbl_data[1] >> 8;
+ buf[nbuf++] = extbl_data[1];
+ extbl_data += 2;
+ }
+ assert (n_table_words <= 5);
+ unsigned j;
+ for (j = 0; j < n_table_words; j++)
+ {
+ data = *extbl_data++;
+ buf[nbuf++] = data >> 24;
+ buf[nbuf++] = data >> 16;
+ buf[nbuf++] = data >> 8;
+ buf[nbuf++] = data >> 0;
+ }
+ }
+
+ if (nbuf > 0 && buf[nbuf - 1] != ARM_EXTBL_OP_FINISH)
+ buf[nbuf++] = ARM_EXTBL_OP_FINISH;
+
+ return nbuf;
+}
+
+HIDDEN int
+arm_exidx_entry_extract (struct elf_image *ei,
+ Elf_W (Shdr) *exidx, Elf_W (Shdr) *extbl,
+ unsigned i, uint8_t *buf)
+{
+ int nbuf = 0;
+ uint32_t *exidx_data = ei->image + exidx->sh_offset;
+ uint32_t base = exidx->sh_addr + i * 8;
+ uint32_t one = base + prel31_read (exidx_data[i * 2]);
+
+ uint32_t two = exidx_data[i * 2 + 1];
+ if (two == ARM_EXIDX_CANT_UNWIND)
+ printf ("0x1 [can't unwind]\n");
+ else if (two & ARM_EXIDX_COMPACT)
+ {
+ printf ("compact model %d [%8.8x]\n", (two >> 24) & 0x7f, two);
+ buf[nbuf++] = two >> 16;
+ buf[nbuf++] = two >> 8;
+ buf[nbuf++] = two;
+ }
+ else
+ {
+ assert (NULL != extbl);
+ two = base + prel31_read (two) + 4;
+ uint32_t *extbl_data = ei->image + extbl->sh_offset
+ + (two - extbl->sh_addr);
+ two = extbl_data[0];
+ unsigned int n_table_words = 0;
+ if (two & ARM_EXIDX_COMPACT)
+ {
+ int pers = (two >> 24) & 0x0f;
+ printf ("compact model %d [%8.8x]\n", pers, two);
+ if (pers == 1 || pers == 2)
+ {
+ n_table_words = (two >> 16) & 0xff;
+ extbl_data += 1;
+ }
+ else
+ buf[nbuf++] = two >> 16;
+ buf[nbuf++] = two >> 8;
+ buf[nbuf++] = two;
+ }
+ else
+ {
+ uint32_t pers = prel31_read (extbl_data[0]);
+ pers += extbl->sh_addr + i * 8 + 4;
+ printf ("Personality routine: %8.8x\n", pers);
+ n_table_words = extbl_data[1] >> 24;
+ buf[nbuf++] = extbl_data[1] >> 16;
+ buf[nbuf++] = extbl_data[1] >> 8;
+ buf[nbuf++] = extbl_data[1];
+ extbl_data += 2;
+ }
+ assert (n_table_words <= 5);
+ unsigned j;
+ for (j = 0; j < n_table_words; j++)
+ {
+ two = *extbl_data++;
+ buf[nbuf++] = two >> 24;
+ buf[nbuf++] = two >> 16;
+ buf[nbuf++] = two >> 8;
+ buf[nbuf++] = two >> 0;
+ }
+ }
+
+ if (nbuf > 0 && buf[nbuf - 1] != ARM_EXTBL_OP_FINISH)
+ buf[nbuf++] = ARM_EXTBL_OP_FINISH;
+
+ return nbuf;
+}
+
+HIDDEN void
+arm_exidx_section_find (struct elf_image *ei,
+ Elf_W (Shdr) **exidx, Elf_W (Shdr) **extbl)
+{
+ Elf_W (Ehdr) *ehdr = ei->image;
+ Elf_W (Shdr) *shdr;
+ shdr = (Elf_W (Shdr) *)((char *)ei->image + ehdr->e_shoff);
+ char *names = (char *)ei->image + shdr[ehdr->e_shstrndx].sh_offset;
+ int i = 0;
+ for (i = 0; i < ehdr->e_shnum; i++)
+ {
+ char *name = names + shdr[i].sh_name;
+ switch (shdr[i].sh_type)
+ {
+ case SHT_ARM_EXIDX:
+ *exidx = shdr + i;
+ break;
+ case SHT_PROGBITS:
+ if (strcmp (name, ".ARM.extab") != 0)
+ break;
+ *extbl = shdr + i;
+ break;
+ }
+ }
+}
+
+/**
+ * Callback to dl_iterate_phr to find each library's unwind table.
+ * If found, calls arm_exidx_table_add to remember it for later lookups.
+ */
+static int
+arm_exidx_init_local_cb (struct dl_phdr_info *info, size_t size, void *data)
+{
+ unsigned i;
+
+ for (i = 0; i < info->dlpi_phnum; i++)
+ {
+ const ElfW (Phdr) *phdr = info->dlpi_phdr + i;
+ if (phdr->p_type != PT_ARM_EXIDX)
+ continue;
+
+ const char *name = info->dlpi_name;
+ if (NULL == name || 0 == name[0])
+ name = arm_exidx_appname;
+
+ ElfW (Addr) addr = info->dlpi_addr + phdr->p_vaddr;
+ ElfW (Word) size = phdr->p_filesz;
+
+ arm_exidx_table_add (name,
+ (struct arm_exidx_entry *)addr,
+ (struct arm_exidx_entry *)(addr + size));
+ break;
+ }
+ return 0;
+}
+
+/**
+ * Must be called for local process lookups.
+ */
+HIDDEN int
+arm_exidx_init_local (const char *appname)
+{
+ arm_exidx_appname = appname;
+ // traverse all libraries and find unwind tables
+ arm_exidx_table_reset_all();
+ return dl_iterate_phdr (&arm_exidx_init_local_cb, NULL);
+}
@@ -31,8 +31,6 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#include <sys/mman.h>
#include <sys/stat.h>
-#include "libunwind_i.h"
-
#if ELF_CLASS == ELFCLASS32
# define ELF_W(x) ELF32_##x
# define Elf_W(x) Elf32_##x
@@ -43,6 +41,8 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
# define elf_w(x) _Uelf64_##x
#endif
+#include "libunwind_i.h"
+
extern int elf_w (valid_object) (struct elf_image *ei);
extern int elf_w (get_proc_name) (unw_addr_space_t as,
pid_t pid, unw_word_t ip,