Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
-#include <errno.h>
#include "as.h"
#include "dw2gencfi.h"
-struct cie_entry
+
+/* We re-use DWARF2_LINE_MIN_INSN_LENGTH for the code alignment field
+ of the CIE. Default to 1 if not otherwise specified. */
+#ifndef DWARF2_LINE_MIN_INSN_LENGTH
+# define DWARF2_LINE_MIN_INSN_LENGTH 1
+#endif
+
+/* If TARGET_USE_CFIPOP is defined, it is required that the target
+ provide the following definitions. Otherwise provide them to
+ allow compilation to continue. */
+#ifndef TARGET_USE_CFIPOP
+# ifndef DWARF2_DEFAULT_RETURN_COLUMN
+# define DWARF2_DEFAULT_RETURN_COLUMN 0
+# endif
+# ifndef DWARF2_CIE_DATA_ALIGNMENT
+# define DWARF2_CIE_DATA_ALIGNMENT 1
+# endif
+#endif
+
+#ifndef tc_cfi_frame_initial_instructions
+# define tc_cfi_frame_initial_instructions() ((void)0)
+#endif
+
+
+struct cfi_insn_data
{
- unsigned long offset;
- size_t size;
- void *data;
- struct cie_entry *next;
+ struct cfi_insn_data *next;
+ int insn;
+ union {
+ struct {
+ unsigned reg;
+ offsetT offset;
+ } ri;
+
+ struct {
+ unsigned reg1;
+ unsigned reg2;
+ } rr;
+
+ unsigned r;
+ offsetT i;
+
+ struct {
+ symbolS *lab1;
+ symbolS *lab2;
+ } ll;
+ } u;
};
-struct cfi_data
+struct fde_entry
{
- enum cfi_insn insn;
- long param[2];
- struct cfi_data *next;
+ struct fde_entry *next;
+ symbolS *start_address;
+ symbolS *end_address;
+ struct cfi_insn_data *data;
+ struct cfi_insn_data **last;
+ unsigned int return_column;
};
-struct cfi_info
+struct cie_entry
{
- addressT start_address;
- addressT end_address;
- addressT last_address;
- const char *labelname;
- struct cfi_data *data;
- struct cfi_info *next;
+ struct cie_entry *next;
+ symbolS *start_address;
+ unsigned int return_column;
+ struct cfi_insn_data *first, *last;
};
-/* Current open CFI entry. */
-static struct cfi_info *cfi_info;
+
+/* Current open FDE entry. */
+static struct fde_entry *cur_fde_data;
+static symbolS *last_address;
+static offsetT cur_cfa_offset;
+
+/* List of FDE entries. */
+static struct fde_entry *all_fde_data;
+static struct fde_entry **last_fde_data = &all_fde_data;
/* List of CIEs so that they could be reused. */
static struct cie_entry *cie_root;
-/* Current target config. */
-static struct cfi_config current_config;
+\f
+/* Construct a new FDE structure and add it to the end of the fde list. */
-/* This is the main entry point to the CFI machinery. */
-static void dot_cfi (int arg);
+static struct fde_entry *
+alloc_fde_entry (void)
+{
+ struct fde_entry *fde = xcalloc (1, sizeof (struct fde_entry));
-const pseudo_typeS cfi_pseudo_table[] =
- {
- { "cfi_verbose", dot_cfi, CFI_verbose },
- { "cfi_startproc", dot_cfi, CFI_startproc },
- { "cfi_endproc", dot_cfi, CFI_endproc },
- { "cfi_def_cfa", dot_cfi, CFA_def_cfa },
- { "cfi_def_cfa_register", dot_cfi, CFA_def_cfa_register },
- { "cfi_def_cfa_offset", dot_cfi, CFA_def_cfa_offset },
- { "cfi_adjust_cfa_offset", dot_cfi, CFI_adjust_cfa_offset },
- { "cfi_offset", dot_cfi, CFA_offset },
- { "cfi_register", dot_cfi, CFA_register },
- { NULL, NULL, 0 }
- };
+ cur_fde_data = fde;
+ *last_fde_data = fde;
+ last_fde_data = &fde->next;
-static const char *
-cfi_insn_str (enum cfi_insn insn)
+ fde->last = &fde->data;
+ fde->return_column = DWARF2_DEFAULT_RETURN_COLUMN;
+
+ return fde;
+}
+
+/* The following functions are available for a backend to construct its
+ own unwind information, usually from legacy unwind directives. */
+
+/* Construct a new INSN structure and add it to the end of the insn list
+ for the currently active FDE. */
+
+static struct cfi_insn_data *
+alloc_cfi_insn_data (void)
{
- switch (insn)
- {
- case CFA_nop:
- return "CFA_nop";
- case CFA_set_loc:
- return "CFA_set_loc";
- case CFA_advance_loc1:
- return "CFA_advance_loc1";
- case CFA_advance_loc2:
- return "CFA_advance_loc2";
- case CFA_advance_loc4:
- return "CFA_advance_loc4";
- case CFA_offset_extended:
- return "CFA_offset_extended";
- case CFA_resotre_extended:
- return "CFA_resotre_extended";
- case CFA_undefined:
- return "CFA_undefined";
- case CFA_same_value:
- return "CFA_same_value";
- case CFA_register:
- return "CFA_register";
- case CFA_remember_state:
- return "CFA_remember_state";
- case CFA_restore_state:
- return "CFA_restore_state";
- case CFA_def_cfa:
- return "CFA_def_cfa";
- case CFA_def_cfa_register:
- return "CFA_def_cfa_register";
- case CFA_def_cfa_offset:
- return "CFA_def_cfa_offset";
- case CFA_advance_loc:
- return "CFA_advance_loc";
- case CFA_offset:
- return "CFA_offset";
- case CFA_restore:
- return "CFA_restore";
- default:
- break;
- }
+ struct cfi_insn_data *insn = xcalloc (1, sizeof (struct cfi_insn_data));
+
+ *cur_fde_data->last = insn;
+ cur_fde_data->last = &insn->next;
- return "CFA_unknown";
+ return insn;
}
-static struct cfi_data *
-alloc_cfi_data (void)
+/* Construct a new FDE structure that begins at LABEL. */
+
+void
+cfi_new_fde (symbolS *label)
{
- return (struct cfi_data *) xcalloc (sizeof (struct cfi_info), 1);
+ struct fde_entry *fde = alloc_fde_entry ();
+ fde->start_address = label;
+ last_address = label;
}
-static struct cfi_info *
-alloc_cfi_info (void)
+/* End the currently open FDE. */
+
+void
+cfi_end_fde (symbolS *label)
{
- return (struct cfi_info *) xcalloc (sizeof (struct cfi_info), 1);
+ cur_fde_data->end_address = label;
+ cur_fde_data = NULL;
}
-/* Parse arguments. */
-static int
-cfi_parse_arg (long *param, int resolvereg)
+/* Set the return column for the current FDE. */
+
+void
+cfi_set_return_column (unsigned regno)
{
- long value;
- int retval = -1;
- int nchars;
+ cur_fde_data->return_column = regno;
+}
- assert (param != NULL);
- SKIP_WHITESPACE ();
+/* Add a CFI insn to advance the PC from the last address to LABEL. */
- if (sscanf (input_line_pointer, "%li%n", &value, &nchars) >= 1)
- {
- input_line_pointer += nchars;
- retval = 1;
- }
-#ifdef tc_regname_to_dw2regnum
- else if (resolvereg && ((is_name_beginner (*input_line_pointer))
- || (*input_line_pointer == '%'
- && is_name_beginner (*(++input_line_pointer)))))
- {
- char *name, c, *p;
+void
+cfi_add_advance_loc (symbolS *label)
+{
+ struct cfi_insn_data *insn = alloc_cfi_insn_data ();
- name = input_line_pointer;
- c = get_symbol_end ();
- p = input_line_pointer;
+ insn->insn = DW_CFA_advance_loc;
+ insn->u.ll.lab1 = last_address;
+ insn->u.ll.lab2 = label;
- if ((value = tc_regname_to_dw2regnum (name)) >= 0)
- retval = 1;
+ last_address = label;
+}
- *p = c;
- }
-#endif
- else
- as_bad (resolvereg ?
- _("can't convert argument to a register number") :
- _("can't convert argument to an integer"));
+/* Add a DW_CFA_offset record to the CFI data. */
+
+void
+cfi_add_CFA_offset (unsigned regno, offsetT offset)
+{
+ struct cfi_insn_data *insn = alloc_cfi_insn_data ();
+
+ insn->insn = DW_CFA_offset;
+ insn->u.ri.reg = regno;
+ insn->u.ri.offset = offset;
+}
- if (retval > 0)
- *param = value;
+/* Add a DW_CFA_def_cfa record to the CFI data. */
- SKIP_WHITESPACE ();
- if (*input_line_pointer == ',')
- {
- input_line_pointer++;
- SKIP_WHITESPACE ();
- }
+void
+cfi_add_CFA_def_cfa (unsigned regno, offsetT offset)
+{
+ struct cfi_insn_data *insn = alloc_cfi_insn_data ();
+
+ insn->insn = DW_CFA_def_cfa;
+ insn->u.ri.reg = regno;
+ insn->u.ri.offset = offset;
- return retval;
+ cur_cfa_offset = offset;
}
-static int
-cfi_parse_reg (long *param)
+/* Add a DW_CFA_register record to the CFI data. */
+
+void
+cfi_add_CFA_register (unsigned reg1, unsigned reg2)
{
- return cfi_parse_arg (param, 1);
+ struct cfi_insn_data *insn = alloc_cfi_insn_data ();
+
+ insn->insn = DW_CFA_register;
+ insn->u.rr.reg1 = reg1;
+ insn->u.rr.reg2 = reg2;
}
-static int
-cfi_parse_const (long *param)
+/* Add a DW_CFA_def_cfa_register record to the CFI data. */
+
+void
+cfi_add_CFA_def_cfa_register (unsigned regno)
{
- return cfi_parse_arg (param, 0);
+ struct cfi_insn_data *insn = alloc_cfi_insn_data ();
+
+ insn->insn = DW_CFA_def_cfa_register;
+ insn->u.r = regno;
}
+/* Add a DW_CFA_def_cfa_offset record to the CFI data. */
+
void
-cfi_add_insn (enum cfi_insn insn, long param0, long param1)
+cfi_add_CFA_def_cfa_offset (offsetT offset)
{
- struct cfi_data *data_ptr;
+ struct cfi_insn_data *insn = alloc_cfi_insn_data ();
+
+ insn->insn = DW_CFA_def_cfa_offset;
+ insn->u.i = offset;
- if (!cfi_info->data)
- {
- cfi_info->data = alloc_cfi_data ();
- data_ptr = cfi_info->data;
- }
- else
- {
- data_ptr = cfi_info->data;
+ cur_cfa_offset = offset;
+}
- while (data_ptr && data_ptr->next)
- data_ptr = data_ptr->next;
+\f
+/* Parse CFI assembler directives. */
- data_ptr->next = alloc_cfi_data ();
+static void dot_cfi (int);
+static void dot_cfi_startproc (int);
+static void dot_cfi_endproc (int);
- data_ptr = data_ptr->next;
- }
+/* Fake CFI type; outside the byte range of any real CFI insn. */
+#define CFI_adjust_cfa_offset 0x100
- data_ptr->insn = insn;
- data_ptr->param[0] = param0;
- data_ptr->param[1] = param1;
-}
+const pseudo_typeS cfi_pseudo_table[] =
+ {
+ { "cfi_startproc", dot_cfi_startproc, 0 },
+ { "cfi_endproc", dot_cfi_endproc, 0 },
+ { "cfi_def_cfa", dot_cfi, DW_CFA_def_cfa },
+ { "cfi_def_cfa_register", dot_cfi, DW_CFA_def_cfa_register },
+ { "cfi_def_cfa_offset", dot_cfi, DW_CFA_def_cfa_offset },
+ { "cfi_adjust_cfa_offset", dot_cfi, CFI_adjust_cfa_offset },
+ { "cfi_offset", dot_cfi, DW_CFA_offset },
+ { "cfi_register", dot_cfi, DW_CFA_register },
+ { NULL, NULL, 0 }
+ };
static void
-cfi_advance_loc (void)
+cfi_parse_separator (void)
{
- addressT curr_address = frag_now_fix ();
- if (cfi_info->last_address == curr_address)
- return;
- cfi_add_insn (CFA_advance_loc,
- (long) (curr_address - cfi_info->last_address), 0);
- cfi_info->last_address = curr_address;
+ SKIP_WHITESPACE ();
+ if (*input_line_pointer == ',')
+ input_line_pointer++;
+ else
+ as_bad (_("missing separator"));
}
-static long
-get_current_offset (struct cfi_info *info)
+static unsigned
+cfi_parse_reg (void)
{
- long current_offset = 0;
- struct cfi_data *data = info->data;
+ int regno;
+ expressionS exp;
+
+#ifdef tc_regname_to_dw2regnum
+ SKIP_WHITESPACE ();
+ if (is_name_beginner (*input_line_pointer)
+ || (*input_line_pointer == '%'
+ && is_name_beginner (*++input_line_pointer)))
+ {
+ char *name, c;
+
+ name = input_line_pointer;
+ c = get_symbol_end ();
+
+ if ((regno = tc_regname_to_dw2regnum (name)) < 0)
+ {
+ as_bad (_("bad register expression"));
+ regno = 0;
+ }
- current_offset = 0;
- while (data)
+ *input_line_pointer = c;
+ return regno;
+ }
+#endif
+
+ expression (&exp);
+ switch (exp.X_op)
{
- if (data->insn == CFA_def_cfa)
- current_offset = data->param[1];
- else if (data->insn == CFA_def_cfa_offset)
- current_offset = data->param[0];
- data = data->next;
+ case O_register:
+ case O_constant:
+ regno = exp.X_add_number;
+ break;
+
+ default:
+ as_bad (_("bad register expression"));
+ regno = 0;
+ break;
}
- return current_offset;
+ return regno;
+}
+
+static offsetT
+cfi_parse_const (void)
+{
+ return get_absolute_expression ();
}
static void
-cfi_make_insn (int arg)
+dot_cfi (int arg)
{
- long param[2] = { 0, 0 };
+ offsetT offset;
+ unsigned reg1, reg2;
- if (!cfi_info)
+ if (!cur_fde_data)
{
as_bad (_("CFI instruction used without previous .cfi_startproc"));
return;
}
- cfi_advance_loc ();
+ /* If the last address was not at the current PC, advance to current. */
+ if (symbol_get_frag (last_address) != frag_now
+ || S_GET_VALUE (last_address) != frag_now_fix ())
+ cfi_add_advance_loc (symbol_temp_new_now ());
switch (arg)
{
/* Instructions that take two arguments (register, integer). */
- case CFA_offset:
- case CFA_def_cfa:
- if (cfi_parse_reg (¶m[0]) < 0)
- {
- as_bad (_("first argument to %s is not a register"),
- cfi_insn_str (arg));
- return;
- }
- if (cfi_parse_const (¶m[1]) < 0)
- {
- as_bad (_("second argument to %s is not a number"),
- cfi_insn_str (arg));
- return;
- }
+ case DW_CFA_offset:
+ case DW_CFA_def_cfa:
+ reg1 = cfi_parse_reg ();
+ cfi_parse_separator ();
+ offset = cfi_parse_const ();
+
+ if (arg == DW_CFA_def_cfa)
+ cfi_add_CFA_def_cfa (reg1, offset);
+ else
+ cfi_add_CFA_offset (reg1, offset);
break;
- case CFA_register:
- if (cfi_parse_reg (¶m[0]) < 0)
- {
- as_bad (_("first argument to %s is not a register"),
- cfi_insn_str (arg));
- return;
- }
- if (cfi_parse_reg (¶m[1]) < 0)
- {
- as_bad (_("second argument to %s is not a register"),
- cfi_insn_str (arg));
- return;
- }
+ /* Instructions that take two arguments (register, register). */
+ case DW_CFA_register:
+ reg1 = cfi_parse_reg ();
+ cfi_parse_separator ();
+ reg2 = cfi_parse_reg ();
+
+ cfi_add_CFA_register (reg1, reg2);
break;
/* Instructions that take one register argument. */
- case CFA_def_cfa_register:
- if (cfi_parse_reg (¶m[0]) < 0)
- {
- as_bad (_("argument to %s is not a register"), cfi_insn_str (arg));
- return;
- }
+ case DW_CFA_def_cfa_register:
+ reg1 = cfi_parse_reg ();
+ cfi_add_CFA_def_cfa_register (reg1);
break;
/* Instructions that take one integer argument. */
- case CFA_def_cfa_offset:
- if (cfi_parse_const (¶m[0]) < 0)
- {
- as_bad (_("argument to %s is not a number"), cfi_insn_str (arg));
- return;
- }
+ case DW_CFA_def_cfa_offset:
+ offset = cfi_parse_const ();
+ cfi_add_CFA_def_cfa_offset (offset);
break;
/* Special handling for pseudo-instruction. */
case CFI_adjust_cfa_offset:
- if (cfi_parse_const (¶m[0]) < 0)
- {
- as_bad (_("argument to %s is not a number"),
- ".cfi_adjust_cfa_offset");
- return;
- }
- param[0] += get_current_offset (cfi_info);
- arg = CFA_def_cfa_offset;
+ offset = cfi_parse_const ();
+ cfi_add_CFA_def_cfa_offset (cur_cfa_offset + offset);
break;
default:
- as_bad (_("unknown CFI instruction %d (%s)"), arg, cfi_insn_str (arg));
- return;
+ abort ();
}
- cfi_add_insn (arg, param[0], param[1]);
-}
-static symbolS *
-cfi_get_label (void)
-{
- char symname[40], *symbase=".Llbl_cfi";
- symbolS *symbolP;
- unsigned int i = 0;
-
- snprintf (symname, sizeof (symname), "%s_0x%lx",
- symbase, (long) frag_now_fix ());
- while ((symbolP = symbol_find (symname)))
- {
- if ((S_GET_VALUE (symbolP) == frag_now_fix ())
- && (S_GET_SEGMENT (symbolP) == now_seg))
- return symbolP;
-
- snprintf (symname, sizeof (symname), "%s_0x%lx_%u",
- symbase, (long) frag_now_fix (), i++);
- }
-#ifdef BFD_ASSEMBLER
- symbolP = (symbolS *) local_symbol_make (symname, now_seg,
- (valueT) frag_now_fix (),
- frag_now);
-#else
- symbolP = symbol_make (symname);
-#endif
- return symbolP;
+ demand_empty_rest_of_line ();
}
static void
-dot_cfi_startproc (void)
+dot_cfi_startproc (int ignored ATTRIBUTE_UNUSED)
{
-#ifdef tc_cfi_frame_initial_instructions
- const char *simple = "simple";
-#endif
+ int simple = 0;
- if (cfi_info)
+ if (cur_fde_data)
{
as_bad (_("previous CFI entry not closed (missing .cfi_endproc)"));
return;
}
-#if defined(TARGET_USE_CFIPOP)
- /* Because this file is linked even for architectures that
- don't use CFI, we must wrap this call. */
- if (current_config.addr_length == 0)
- tc_cfi_init ();
-#endif
+ cfi_new_fde (symbol_temp_new_now ());
- cfi_info = alloc_cfi_info ();
+ SKIP_WHITESPACE ();
+ if (is_name_beginner (*input_line_pointer))
+ {
+ char *name, c;
- cfi_info->start_address = frag_now_fix ();
- cfi_info->last_address = cfi_info->start_address;
- cfi_info->labelname = S_GET_NAME (cfi_get_label ());
+ name = input_line_pointer;
+ c = get_symbol_end ();
- SKIP_WHITESPACE ();
-#ifdef tc_cfi_frame_initial_instructions
- if (strncmp (simple, input_line_pointer, strlen (simple)) != 0)
+ if (strcmp (name, "simple") == 0)
+ {
+ simple = 1;
+ *input_line_pointer = c;
+ }
+ else
+ input_line_pointer = name;
+ }
+ demand_empty_rest_of_line ();
+
+ if (!simple)
tc_cfi_frame_initial_instructions ();
- else
- input_line_pointer += strlen (simple);
-#endif
}
-#define cfi_is_advance_insn(insn) \
- ((insn >= CFA_set_loc && insn <= CFA_advance_loc4) \
- || insn == CFA_advance_loc)
+static void
+dot_cfi_endproc (int ignored ATTRIBUTE_UNUSED)
+{
+ if (! cur_fde_data)
+ {
+ as_bad (_(".cfi_endproc without corresponding .cfi_startproc"));
+ return;
+ }
-/* Output CFI instructions to the file. */
+ cfi_end_fde (symbol_temp_new_now ());
+}
-enum data_types
- {
- t_ascii = 0,
- t_byte = 1,
- t_half = 2,
- t_long = 4,
- t_quad = 8,
- t_uleb128 = 0x10,
- t_sleb128 = 0x11
- };
+\f
+/* Emit a single byte into the current segment. */
-static int
-output_data (char **p, unsigned long *size, enum data_types type, long value)
+static inline void
+out_one (int byte)
{
- char *ptr = *p;
- unsigned int ret_size;
+ FRAG_APPEND_1_CHAR (byte);
+}
- switch (type)
- {
- case t_byte:
- ret_size = 1;
- break;
- case t_half:
- ret_size = 2;
- break;
- case t_long:
- ret_size = 4;
- break;
- case t_quad:
- case t_uleb128:
- case t_sleb128:
- ret_size = 8;
- break;
- default:
- /* This should never happen - throw an internal error. */
- as_fatal (_("unknown type %d"), type);
- return 0;
- }
+/* Emit a two-byte word into the current segment. */
- if (*size < ret_size)
- {
- as_bad (_("output_data buffer is too small"));
- return 0;
- }
+static inline void
+out_two (int data)
+{
+ md_number_to_chars (frag_more (2), data, 2);
+}
- switch (type)
- {
- case t_byte:
- *ptr = (char) value;
- if (verbose)
- printf ("\t.byte\t0x%x\n", (unsigned char) *ptr);
- break;
- case t_half:
- *(short *) ptr = (short) value & 0xFFFF;
- if (verbose)
- printf ("\t.half\t0x%x\n", (unsigned short) *ptr);
- break;
- case t_long:
- *(int *) ptr = (int) value & 0xFFFFFFFF;
- if (verbose)
- printf ("\t.long\t0x%x\n", (unsigned int) *ptr);
- break;
- case t_quad:
- *(long long *) ptr = (long long) value & 0xFFFFFFFF;
- if (verbose)
- printf ("\t.quad\t0x%x\n", (unsigned int) *ptr);
- break;
- case t_uleb128:
- case t_sleb128:
- ret_size = output_leb128 (ptr, value, type == t_sleb128);
- if (verbose)
- printf ("\t.%s\t0x%lx\n",
- type == t_sleb128 ? "sleb128" : "uleb128",
- value);
- break;
- default:
- as_fatal (_("unknown type %d"), type);
- return 0;
- }
+/* Emit a four byte word into the current segment. */
- *size -= ret_size;
- *p += ret_size;
+static inline void
+out_four (int data)
+{
+ md_number_to_chars (frag_more (4), data, 4);
+}
+
+/* Emit an unsigned "little-endian base 128" number. */
- return ret_size;
+static void
+out_uleb128 (addressT value)
+{
+ output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0);
}
-static int
-cfi_output_insn (struct cfi_data *data, char **buf, unsigned long *buf_size)
+/* Emit an unsigned "little-endian base 128" number. */
+
+static void
+out_sleb128 (offsetT value)
{
- char **pbuf = buf, *orig_buf = *buf;
- unsigned long size;
+ output_leb128 (frag_more (sizeof_leb128 (value, 1)), value, 1);
+}
- if (!data || !buf)
- as_fatal (_("cfi_output_insn called with NULL pointer"));
+static void
+output_cfi_insn (struct cfi_insn_data *insn)
+{
+ offsetT offset;
+ unsigned int regno;
- switch (data->insn)
+ switch (insn->insn)
{
- case CFA_advance_loc:
- if (verbose)
- printf ("\t# %s(%ld)\n", cfi_insn_str (data->insn),
- data->param[0]);
- if (data->param[0] <= 0x3F)
- {
- output_data (pbuf, buf_size, t_byte, CFA_advance_loc +
- (data->param[0] / current_config.code_align));
- }
- else if (data->param[0] <= 0xFF)
- {
- output_data (pbuf, buf_size, t_byte, CFA_advance_loc1);
- output_data (pbuf, buf_size, t_byte,
- data->param[0] / current_config.code_align);
- }
- else if (data->param[0] <= 0xFFFF)
+ case DW_CFA_advance_loc:
+ {
+ symbolS *from = insn->u.ll.lab1;
+ symbolS *to = insn->u.ll.lab2;
+
+ if (symbol_get_frag (to) == symbol_get_frag (from))
+ {
+ addressT delta = S_GET_VALUE (to) - S_GET_VALUE (from);
+ addressT scaled = delta / DWARF2_LINE_MIN_INSN_LENGTH;
+
+ if (scaled <= 0x3F)
+ out_one (DW_CFA_advance_loc + scaled);
+ else if (delta <= 0xFF)
+ {
+ out_one (DW_CFA_advance_loc1);
+ out_one (delta);
+ }
+ else if (delta <= 0xFFFF)
+ {
+ out_one (DW_CFA_advance_loc2);
+ out_two (delta);
+ }
+ else
+ {
+ out_one (DW_CFA_advance_loc4);
+ out_four (delta);
+ }
+ }
+ else
+ {
+ expressionS exp;
+
+ exp.X_op = O_subtract;
+ exp.X_add_symbol = to;
+ exp.X_op_symbol = from;
+ exp.X_add_number = 0;
+
+ /* The code in ehopt.c expects that one byte of the encoding
+ is already allocated to the frag. This comes from the way
+ that it scans the .eh_frame section looking first for the
+ .byte DW_CFA_advance_loc4. */
+ frag_more (1);
+
+ frag_var (rs_cfa, 4, 0, DWARF2_LINE_MIN_INSN_LENGTH << 3,
+ make_expr_symbol (&exp), frag_now_fix () - 1,
+ (char *) frag_now);
+ }
+ }
+ break;
+
+ case DW_CFA_def_cfa:
+ offset = insn->u.ri.offset;
+ if (offset < 0)
{
- output_data (pbuf, buf_size, t_byte, CFA_advance_loc2);
- output_data (pbuf, buf_size, t_half,
- data->param[0] / current_config.code_align);
+ out_one (DW_CFA_def_cfa_sf);
+ out_uleb128 (insn->u.ri.reg);
+ out_uleb128 (offset);
}
else
{
- output_data (pbuf, buf_size, t_byte, CFA_advance_loc4);
- output_data (pbuf, buf_size, t_long,
- data->param[0] / current_config.code_align);
+ out_one (DW_CFA_def_cfa);
+ out_uleb128 (insn->u.ri.reg);
+ out_uleb128 (offset);
}
break;
- case CFA_def_cfa:
- if (verbose)
- printf ("\t# CFA_def_cfa(%ld,%ld)\n",
- data->param[0], data->param[1]);
- output_data (pbuf, buf_size, t_byte, CFA_def_cfa);
- output_data (pbuf, buf_size, t_uleb128, data->param[0]);
- output_data (pbuf, buf_size, t_uleb128, data->param[1]);
+ case DW_CFA_def_cfa_register:
+ out_one (DW_CFA_def_cfa_register);
+ out_uleb128 (insn->u.i);
break;
- case CFA_def_cfa_register:
- case CFA_def_cfa_offset:
- if (verbose)
- printf ("\t# %s(%ld)\n", cfi_insn_str (data->insn),
- data->param[0]);
- output_data (pbuf, buf_size, t_byte, data->insn);
- output_data (pbuf, buf_size, t_uleb128, data->param[0]);
+ case DW_CFA_def_cfa_offset:
+ offset = insn->u.i;
+ if (offset < 0)
+ {
+ out_one (DW_CFA_def_cfa_offset_sf);
+ out_sleb128 (offset);
+ }
+ else
+ {
+ out_one (DW_CFA_def_cfa_offset);
+ out_uleb128 (offset);
+ }
break;
- case CFA_offset:
- if (verbose)
- printf ("\t# %s(%ld,%ld)\n", cfi_insn_str (data->insn),
- data->param[0], data->param[1]);
-
- /* Check whether to use CFA_offset or CFA_offset_extended. */
- if (data->param[0] <= 0x3F)
- output_data (pbuf, buf_size, t_byte, CFA_offset + data->param[0]);
+ case DW_CFA_offset:
+ regno = insn->u.ri.reg;
+ offset = insn->u.ri.offset / DWARF2_CIE_DATA_ALIGNMENT;
+ if (offset < 0)
+ {
+ out_one (DW_CFA_offset_extended);
+ out_uleb128 (regno);
+ out_sleb128 (offset);
+ }
+ else if (regno <= 0x3F)
+ {
+ out_one (DW_CFA_offset + regno);
+ out_uleb128 (offset);
+ }
else
{
- output_data (pbuf, buf_size, t_byte, CFA_offset_extended);
- output_data (pbuf, buf_size, t_uleb128, data->param[0]);
+ out_one (DW_CFA_offset_extended);
+ out_uleb128 (regno);
+ out_uleb128 (offset);
}
- output_data (pbuf, buf_size, t_uleb128,
- data->param[1] / current_config.data_align);
break;
- case CFA_register:
- if (verbose)
- printf ("\t# %s(%ld,%ld)\n", cfi_insn_str (data->insn),
- data->param[0], data->param[1]);
- output_data (pbuf, buf_size, t_byte, CFA_register);
- output_data (pbuf, buf_size, t_uleb128, data->param[0]);
- output_data (pbuf, buf_size, t_uleb128, data->param[1]);
+ case DW_CFA_register:
+ out_one (DW_CFA_register);
+ out_uleb128 (insn->u.rr.reg1);
+ out_uleb128 (insn->u.rr.reg2);
break;
- case CFA_nop:
- if (verbose)
- printf ("\t# CFA_nop\n");
- output_data (pbuf, buf_size, t_byte, CFA_nop);
+ case DW_CFA_nop:
+ out_one (DW_CFA_nop);
break;
default:
- as_warn ("CFA_unknown[%d](%ld,%ld)", data->insn,
- data->param[0], data->param[1]);
+ abort ();
}
- size = *pbuf - orig_buf;
- *buf = *pbuf;
- *buf_size -= size;
- return size;
}
static void
-dot_cfi_endproc (void)
+output_cie (struct cie_entry *cie)
{
- struct cfi_data *data_ptr;
- struct cie_entry *cie_ptr;
- char *cie_buf, *fde_buf, *pbuf, *where;
- unsigned long buf_size, cie_size, fde_size, last_cie_offset;
- unsigned long fde_initloc_offset, fde_len_offset, fde_offset;
- segT saved_seg, cfi_seg;
+ symbolS *after_size_address, *end_address;
expressionS exp;
+ struct cfi_insn_data *i;
+
+ cie->start_address = symbol_temp_new_now ();
+ after_size_address = symbol_temp_make ();
+ end_address = symbol_temp_make ();
+
+ exp.X_op = O_subtract;
+ exp.X_add_symbol = end_address;
+ exp.X_op_symbol = after_size_address;
+ exp.X_add_number = 0;
+
+ emit_expr (&exp, 4); /* Length */
+ symbol_set_value_now (after_size_address);
+ out_four (0); /* CIE id */
+ out_one (DW_CIE_VERSION); /* Version */
+ out_one ('z'); /* Augmentation */
+ out_one ('R');
+ out_one (0);
+ out_uleb128 (DWARF2_LINE_MIN_INSN_LENGTH); /* Code alignment */
+ out_sleb128 (DWARF2_CIE_DATA_ALIGNMENT); /* Data alignment */
+ out_one (cie->return_column); /* Return column */
+ out_uleb128 (1); /* Augmentation size */
+ out_one (DW_EH_PE_pcrel | DW_EH_PE_sdata4);
+
+ if (cie->first)
+ for (i = cie->first; i != cie->last; i = i->next)
+ output_cfi_insn (i);
+
+ frag_align (2, 0, 0);
+ symbol_set_value_now (end_address);
+}
- if (! cfi_info)
- {
- as_bad (_(".cfi_endproc without corresponding .cfi_startproc"));
- return;
- }
- cfi_info->end_address = frag_now_fix ();
+static void
+output_fde (struct fde_entry *fde, struct cie_entry *cie,
+ struct cfi_insn_data *first)
+{
+ symbolS *after_size_address, *end_address;
+ expressionS exp;
- /* Open .eh_frame section. */
- saved_seg = now_seg;
- cfi_seg = subseg_new (".eh_frame", 0);
-#ifdef BFD_ASSEMBLER
- bfd_set_section_flags (stdoutput, cfi_seg,
- SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_DATA);
-#endif
- subseg_set (cfi_seg, 0);
+ after_size_address = symbol_temp_make ();
+ end_address = symbol_temp_make ();
- /* Build CIE. */
- cie_buf = xcalloc (1024, 1);
- /* Skip space for CIE length. */
- pbuf = cie_buf + 4;
- buf_size = 1020;
-
- if (verbose)
- printf ("# CIE *****\n");
-
- /* CIE id. */
- output_data (&pbuf, &buf_size, t_long, 0x0);
- /* Version. */
- output_data (&pbuf, &buf_size, t_byte, 1);
- /* Augmentation. */
- output_data (&pbuf, &buf_size, t_byte, 0);
- /* Code alignment. */
- output_data (&pbuf, &buf_size, t_uleb128, current_config.code_align);
- /* Data alignment. */
- output_data (&pbuf, &buf_size, t_sleb128, current_config.data_align);
- /* Return address column. */
- output_data (&pbuf, &buf_size, t_byte, current_config.ra_column);
-
- /* Build CFI instructions. */
- data_ptr = cfi_info->data;
- while (data_ptr && !cfi_is_advance_insn (data_ptr->insn))
- {
- cfi_output_insn (data_ptr, &pbuf, &buf_size);
- data_ptr = data_ptr->next;
- }
+ exp.X_op = O_subtract;
+ exp.X_add_symbol = end_address;
+ exp.X_op_symbol = after_size_address;
+ exp.X_add_number = 0;
+ emit_expr (&exp, 4); /* Length */
+ symbol_set_value_now (after_size_address);
- /* Align the whole data to current_config.eh_align. */
- cie_size = pbuf - cie_buf;
- cie_size += current_config.eh_align - cie_size % current_config.eh_align;
+ exp.X_add_symbol = after_size_address;
+ exp.X_op_symbol = cie->start_address;
+ emit_expr (&exp, 4); /* CIE offset */
+
+ exp.X_add_symbol = fde->start_address;
+ exp.X_op_symbol = symbol_temp_new_now ();
+ emit_expr (&exp, 4); /* Code offset */
- /* CIE length. */
- pbuf = cie_buf;
- output_data (&pbuf, &buf_size, t_long, cie_size - 4);
+ exp.X_add_symbol = fde->end_address;
+ exp.X_op_symbol = fde->start_address; /* Code length */
+ emit_expr (&exp, 4);
- /* OK, we built the CIE. Let's write it to the file... */
- last_cie_offset = frag_now_fix ();
+ out_uleb128 (0); /* Augmentation size */
- /* Check if we have already emitted the exactly same CIE.
- If yes then use its offset instead and don't put out
- the new one. */
- cie_ptr = cie_root;
- while (cie_ptr)
- {
- if (cie_ptr->size == cie_size - 4
- && memcmp (cie_ptr->data, cie_buf + 4, cie_ptr->size) == 0)
- break;
- cie_ptr = cie_ptr->next;
- }
+ for (; first; first = first->next)
+ output_cfi_insn (first);
- /* If we have found the same CIE, use it... */
- if (cie_ptr)
- {
- if (verbose)
- printf ("# Duplicate CIE found. Previous is at offset %lu\n",
- cie_ptr->offset);
- last_cie_offset = cie_ptr->offset;
- }
- else
+ frag_align (2, 0, 0);
+ symbol_set_value_now (end_address);
+}
+
+static struct cie_entry *
+select_cie_for_fde (struct fde_entry *fde, struct cfi_insn_data **pfirst)
+{
+ struct cfi_insn_data *i, *j;
+ struct cie_entry *cie;
+
+ for (cie = cie_root; cie; cie = cie->next)
{
- /* Otherwise join this CIE to the list. */
- where = (unsigned char *) frag_more (cie_size);
- memcpy (where, cie_buf, cie_size);
- if (cie_root)
+ if (cie->return_column != fde->return_column)
+ continue;
+ for (i = cie->first, j = fde->data;
+ i != cie->last && j != NULL;
+ i = i->next, j = j->next)
{
- cie_ptr = cie_root;
- while (cie_ptr->next)
- cie_ptr = cie_ptr->next;
- cie_ptr->next = calloc (sizeof (struct cie_entry), 1);
- cie_ptr = cie_ptr->next;
+ if (i->insn != j->insn)
+ goto fail;
+ switch (i->insn)
+ {
+ case DW_CFA_advance_loc:
+ /* We reached the first advance in the FDE, but did not
+ reach the end of the CIE list. */
+ goto fail;
+
+ case DW_CFA_offset:
+ case DW_CFA_def_cfa:
+ if (i->u.ri.reg != j->u.ri.reg)
+ goto fail;
+ if (i->u.ri.offset != j->u.ri.offset)
+ goto fail;
+ break;
+
+ case DW_CFA_register:
+ if (i->u.rr.reg1 != j->u.rr.reg1)
+ goto fail;
+ if (i->u.rr.reg2 != j->u.rr.reg2)
+ goto fail;
+ break;
+
+ case DW_CFA_def_cfa_register:
+ if (i->u.r != j->u.r)
+ goto fail;
+ break;
+
+ case DW_CFA_def_cfa_offset:
+ if (i->u.i != j->u.i)
+ goto fail;
+ break;
+
+ default:
+ abort ();
+ }
}
- else
+
+ /* Success if we reached the end of the CIE list, and we've either
+ run out of FDE entries or we've encountered an advance. */
+ if (i == cie->last && (!j || j->insn == DW_CFA_advance_loc))
{
- cie_root = calloc (sizeof (struct cie_entry), 1);
- cie_ptr = cie_root;
+ *pfirst = j;
+ return cie;
}
- cie_ptr->size = cie_size - 4;
- cie_ptr->data = calloc (cie_ptr->size, 1);
- cie_ptr->offset = last_cie_offset;
- memcpy (cie_ptr->data, cie_buf + 4, cie_ptr->size);
- }
-
- /* Clean up. */
- free (cie_buf);
-
- /* Build the FDE... */
- fde_buf = xcalloc (1024, 1);
- pbuf = fde_buf;
- buf_size = 1024;
-
- /* Offset of this FDE in current fragment. */
- fde_offset = frag_now_fix ();
-
- if (verbose)
- {
- printf ("# FDE: start=0x%lx, end=0x%lx, delta=%d\n",
- (long) cfi_info->start_address,
- (long) cfi_info->end_address,
- (int) (cfi_info->end_address - cfi_info->start_address));
- }
-
- /* FDE length (t_long, 4 bytes) - will be set later. */
- fde_len_offset = pbuf - fde_buf;
- pbuf += 4;
- buf_size -= 4;
-
- /* CIE pointer - offset from here. */
- output_data (&pbuf, &buf_size, t_long, fde_offset - last_cie_offset + 4);
-
- /* FDE initial location - this must be set relocatable! */
- fde_initloc_offset = pbuf - fde_buf + fde_offset;
- output_data (&pbuf, &buf_size, current_config.addr_length,
- cfi_info->start_address);
-
- /* FDE address range. */
- output_data (&pbuf, &buf_size, current_config.addr_length,
- cfi_info->end_address - cfi_info->start_address);
-
- while (data_ptr)
- {
- cfi_output_insn (data_ptr, &pbuf, &buf_size);
- data_ptr = data_ptr->next;
+ fail:;
}
- fde_size = pbuf - fde_buf;
- fde_size += current_config.eh_align - fde_size % current_config.eh_align;
+ cie = xmalloc (sizeof (struct cie_entry));
+ cie->next = cie_root;
+ cie_root = cie;
+ cie->return_column = fde->return_column;
+ cie->first = fde->data;
- /* Now we can set FDE length. */
- pbuf = fde_buf + fde_len_offset;
- buf_size = 4;
- output_data (&pbuf, &buf_size, t_long, fde_size - 4);
-
- /* Copy FDE to objfile. */
- where = (unsigned char *) frag_more (fde_size);
- memcpy (where, fde_buf, fde_size);
-
- /* Set relocation for initial address. */
- buf_size = current_config.addr_length;
- memset (&exp, 0, sizeof (exp));
- exp.X_op = O_symbol;
- exp.X_add_symbol = symbol_find (cfi_info->labelname);
- fix_new_exp (frag_now, fde_initloc_offset,
- current_config.addr_length,
- &exp, 0, current_config.reloc_type);
-
- /* Clean up. */
- free (fde_buf);
+ for (i = cie->first; i ; i = i->next)
+ if (i->insn == DW_CFA_advance_loc)
+ break;
- free (cfi_info);
- cfi_info = NULL;
+ cie->last = i;
+ *pfirst = i;
+
+ output_cie (cie);
- /* Restore previous segment. */
- subseg_set (saved_seg, 0);
+ return cie;
}
void
-dot_cfi (int arg)
+cfi_finish (void)
{
- long param;
+ segT cfi_seg;
+ struct fde_entry *fde;
- switch (arg)
+ if (cur_fde_data)
{
- case CFI_startproc:
- dot_cfi_startproc ();
- break;
- case CFI_endproc:
- dot_cfi_endproc ();
- break;
- case CFA_def_cfa:
- case CFA_def_cfa_register:
- case CFA_def_cfa_offset:
- case CFA_offset:
- case CFA_register:
- case CFI_adjust_cfa_offset:
- cfi_make_insn (arg);
- break;
- case CFI_verbose:
- if (cfi_parse_const (¶m) >= 0)
- verbose = (int) param;
- else
- verbose = 1;
- break;
- default:
- as_bad (_("unknown CFI code 0x%x (%s)"), arg, cfi_insn_str (arg));
- break;
+ as_bad (_("open CFI at the end of file; missing .cfi_endproc directive"));
+ cur_fde_data->end_address = cur_fde_data->start_address;
}
- ignore_rest_of_line ();
-}
-void
-cfi_set_config (struct cfi_config *cfg)
-{
- assert (cfg != NULL);
- assert (cfg->addr_length > 0);
+ if (all_fde_data == 0)
+ return;
- current_config = *cfg;
-}
+ /* Open .eh_frame section. */
+ cfi_seg = subseg_new (".eh_frame", 0);
+#ifdef BFD_ASSEMBLER
+ bfd_set_section_flags (stdoutput, cfi_seg,
+ SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_DATA);
+#endif
+ subseg_set (cfi_seg, 0);
+ record_alignment (cfi_seg, 2);
-void
-cfi_finish (void)
-{
- if (cfi_info)
- as_bad (_("open CFI at the end of file; missing .cfi_endproc directive"));
+ for (fde = all_fde_data; fde ; fde = fde->next)
+ {
+ struct cfi_insn_data *first;
+ struct cie_entry *cie;
+
+ cie = select_cie_for_fde (fde, &first);
+ output_fde (fde, cie, first);
+ }
}
projects / binutils-gdb.git / commitdiff