X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=gas%2Fdw2gencfi.c;h=705157bff1fcda02d35c75f0caccd3f5372bbc4a;hb=6303c4aebd1c9f36d620adb9221f6f27d57e210d;hp=4e39ac5a5278b82c984eeb9e4a4fff0bef748c44;hpb=ae424f8246a09295cca8da6922c8ee781dec4fb1;p=binutils-gdb.git diff --git a/gas/dw2gencfi.c b/gas/dw2gencfi.c index 4e39ac5a527..705157bff1f 100644 --- a/gas/dw2gencfi.c +++ b/gas/dw2gencfi.c @@ -1,12 +1,13 @@ /* dw2gencfi.c - Support for generating Dwarf2 CFI information. - Copyright 2003, 2004, 2005, 2006 Free Software Foundation, Inc. + Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 + Free Software Foundation, Inc. Contributed by Michal Ludvig This file is part of GAS, the GNU Assembler. GAS is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2, or (at your option) + the Free Software Foundation; either version 3, or (at your option) any later version. GAS is distributed in the hope that it will be useful, @@ -22,46 +23,268 @@ #include "as.h" #include "dw2gencfi.h" #include "subsegs.h" +#include "dwarf2dbg.h" +#ifdef TARGET_USE_CFIPOP + +/* By default, use difference expressions if DIFF_EXPR_OK is defined. */ +#ifndef CFI_DIFF_EXPR_OK +# ifdef DIFF_EXPR_OK +# define CFI_DIFF_EXPR_OK 1 +# else +# define CFI_DIFF_EXPR_OK 0 +# endif +#endif + +#ifndef CFI_DIFF_LSDA_OK +#define CFI_DIFF_LSDA_OK CFI_DIFF_EXPR_OK +#endif + +#if CFI_DIFF_EXPR_OK == 1 && CFI_DIFF_LSDA_OK == 0 +# error "CFI_DIFF_EXPR_OK should imply CFI_DIFF_LSDA_OK" +#endif /* 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 +#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 +/* By default, use 32-bit relocations from .eh_frame into .text. */ +#ifndef DWARF2_FDE_RELOC_SIZE +#define DWARF2_FDE_RELOC_SIZE 4 +#endif + +/* By default, use a read-only .eh_frame section. */ +#ifndef DWARF2_EH_FRAME_READ_ONLY +#define DWARF2_EH_FRAME_READ_ONLY SEC_READONLY #endif #ifndef EH_FRAME_ALIGNMENT -# define EH_FRAME_ALIGNMENT (bfd_get_arch_size (stdoutput) == 64 ? 3 : 2) +#define EH_FRAME_ALIGNMENT (bfd_get_arch_size (stdoutput) == 64 ? 3 : 2) #endif #ifndef tc_cfi_frame_initial_instructions -# define tc_cfi_frame_initial_instructions() ((void)0) +#define tc_cfi_frame_initial_instructions() ((void)0) #endif +#ifndef DWARF2_FORMAT +#define DWARF2_FORMAT(SEC) dwarf2_format_32bit +#endif + +#ifndef DWARF2_ADDR_SIZE +#define DWARF2_ADDR_SIZE(bfd) (bfd_arch_bits_per_address (bfd) / 8) +#endif + +#if defined (TE_PE) || defined (TE_PEP) +#define SUPPORT_FRAME_LINKONCE 1 +#else +#define SUPPORT_FRAME_LINKONCE 0 +#endif + +#if SUPPORT_FRAME_LINKONCE +#define CUR_SEG(structp) structp->cur_seg +#define SET_CUR_SEG(structp, seg) structp->cur_seg = seg +#define HANDLED(structp) structp->handled +#define SET_HANDLED(structp, val) structp->handled = val +#else +#define CUR_SEG(structp) NULL +#define SET_CUR_SEG(structp, seg) (void) (0 && seg) +#define HANDLED(structp) 0 +#define SET_HANDLED(structp, val) (void) (0 && val) +#endif + +/* Private segment collection list. */ +struct dwcfi_seg_list +{ + segT seg; + int subseg; + char * seg_name; +}; + +#define FRAME_NAME ".eh_frame" + +static struct hash_control *dwcfi_hash; + +/* Build based on segment the derived .debug_... + segment name containing origin segment's postfix name part. */ + +static char * +get_debugseg_name (segT seg, const char *base_name) +{ + const char *name; + + if (!seg) + name = ""; + else + { + const char * dollar; + const char * dot; + + name = bfd_get_section_name (stdoutput, seg); + + dollar = strchr (name, '$'); + dot = strchr (name + 1, '.'); + + if (!dollar && !dot) + name = ""; + else if (!dollar) + name = dot; + else if (!dot) + name = dollar; + else if (dot < dollar) + name = dot; + else + name = dollar; + } + + return concat (base_name, name, NULL); +} + +/* Allocate a dwcfi_seg_list structure. */ + +static struct dwcfi_seg_list * +alloc_debugseg_item (segT seg, int subseg, char *name) +{ + struct dwcfi_seg_list *r; + + r = (struct dwcfi_seg_list *) + xmalloc (sizeof (struct dwcfi_seg_list) + strlen (name)); + r->seg = seg; + r->subseg = subseg; + r->seg_name = name; + return r; +} + +static segT +is_now_linkonce_segment (void) +{ + if ((bfd_get_section_flags (stdoutput, now_seg) + & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD + | SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE + | SEC_LINK_DUPLICATES_SAME_CONTENTS)) != 0) + return now_seg; + return NULL; +} + +/* Generate debug... segment with same linkonce properties + of based segment. */ + +static segT +make_debug_seg (segT cseg, char *name, int sflags) +{ + segT save_seg = now_seg; + int save_subseg = now_subseg; + segT r; + flagword flags; + + r = subseg_new (name, 0); + + /* Check if code segment is marked as linked once. */ + if (!cseg) + flags = 0; + else + flags = bfd_get_section_flags (stdoutput, cseg) + & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES_DISCARD + | SEC_LINK_DUPLICATES_ONE_ONLY | SEC_LINK_DUPLICATES_SAME_SIZE + | SEC_LINK_DUPLICATES_SAME_CONTENTS); + + /* Add standard section flags. */ + flags |= sflags; + + /* Apply possibly linked once flags to new generated segment, too. */ + if (!bfd_set_section_flags (stdoutput, r, flags)) + as_bad (_("bfd_set_section_flags: %s"), + bfd_errmsg (bfd_get_error ())); + + /* Restore to previous segment. */ + if (save_seg != NULL) + subseg_set (save_seg, save_subseg); + return r; +} + +static void +dwcfi_hash_insert (const char *name, struct dwcfi_seg_list *item) +{ + const char *error_string; + + if ((error_string = hash_jam (dwcfi_hash, name, (char *) item))) + as_fatal (_("Inserting \"%s\" into structure table failed: %s"), + name, error_string); +} + +static struct dwcfi_seg_list * +dwcfi_hash_find (char *name) +{ + return (struct dwcfi_seg_list *) hash_find (dwcfi_hash, name); +} + +static struct dwcfi_seg_list * +dwcfi_hash_find_or_make (segT cseg, const char *base_name, int flags) +{ + struct dwcfi_seg_list *item; + char *name; + + /* Initialize dwcfi_hash once. */ + if (!dwcfi_hash) + dwcfi_hash = hash_new (); + + name = get_debugseg_name (cseg, base_name); + + item = dwcfi_hash_find (name); + if (!item) + { + item = alloc_debugseg_item (make_debug_seg (cseg, name, flags), 0, name); + + dwcfi_hash_insert (item->seg_name, item); + } + else + free (name); + + return item; +} + +/* ??? Share this with dwarf2cfg.c. */ +#ifndef TC_DWARF2_EMIT_OFFSET +#define TC_DWARF2_EMIT_OFFSET generic_dwarf2_emit_offset + +/* Create an offset to .dwarf2_*. */ + +static void +generic_dwarf2_emit_offset (symbolS *symbol, unsigned int size) +{ + expressionS exp; + + exp.X_op = O_symbol; + exp.X_add_symbol = symbol; + exp.X_add_number = 0; + emit_expr (&exp, size); +} +#endif + +struct cfi_escape_data +{ + struct cfi_escape_data *next; + expressionS exp; +}; struct cfi_insn_data { struct cfi_insn_data *next; +#if SUPPORT_FRAME_LINKONCE + segT cur_seg; +#endif int insn; - union { - struct { + union + { + struct + { unsigned reg; offsetT offset; } ri; - struct { + struct + { unsigned reg1; unsigned reg2; } rr; @@ -69,40 +292,60 @@ struct cfi_insn_data unsigned r; offsetT i; - struct { + struct + { symbolS *lab1; symbolS *lab2; } ll; - struct cfi_escape_data { - struct cfi_escape_data *next; + struct cfi_escape_data *esc; + + struct + { + unsigned reg, encoding; expressionS exp; - } *esc; + } ea; } u; }; struct fde_entry { struct fde_entry *next; +#if SUPPORT_FRAME_LINKONCE + segT cur_seg; +#endif symbolS *start_address; symbolS *end_address; struct cfi_insn_data *data; struct cfi_insn_data **last; + unsigned char per_encoding; + unsigned char lsda_encoding; + expressionS personality; + expressionS lsda; unsigned int return_column; unsigned int signal_frame; +#if SUPPORT_FRAME_LINKONCE + int handled; +#endif }; struct cie_entry { struct cie_entry *next; +#if SUPPORT_FRAME_LINKONCE + segT cur_seg; +#endif symbolS *start_address; unsigned int return_column; unsigned int signal_frame; + unsigned char per_encoding; + unsigned char lsda_encoding; + expressionS personality; struct cfi_insn_data *first, *last; }; - /* List of FDE entries. */ + static struct fde_entry *all_fde_data; static struct fde_entry **last_fde_data = &all_fde_data; @@ -130,15 +373,20 @@ struct frch_cfi_data static struct fde_entry * alloc_fde_entry (void) { - struct fde_entry *fde = xcalloc (1, sizeof (struct fde_entry)); + struct fde_entry *fde = (struct fde_entry *) + xcalloc (1, sizeof (struct fde_entry)); - frchain_now->frch_cfi_data = xcalloc (1, sizeof (struct frch_cfi_data)); + frchain_now->frch_cfi_data = (struct frch_cfi_data *) + xcalloc (1, sizeof (struct frch_cfi_data)); frchain_now->frch_cfi_data->cur_fde_data = fde; *last_fde_data = fde; last_fde_data = &fde->next; - + SET_CUR_SEG (fde, is_now_linkonce_segment ()); + SET_HANDLED (fde, 0); fde->last = &fde->data; fde->return_column = DWARF2_DEFAULT_RETURN_COLUMN; + fde->per_encoding = DW_EH_PE_omit; + fde->lsda_encoding = DW_EH_PE_omit; return fde; } @@ -152,18 +400,19 @@ alloc_fde_entry (void) static struct cfi_insn_data * alloc_cfi_insn_data (void) { - struct cfi_insn_data *insn = xcalloc (1, sizeof (struct cfi_insn_data)); + struct cfi_insn_data *insn = (struct cfi_insn_data *) + xcalloc (1, sizeof (struct cfi_insn_data)); struct fde_entry *cur_fde_data = frchain_now->frch_cfi_data->cur_fde_data; *cur_fde_data->last = insn; cur_fde_data->last = &insn->next; - + SET_CUR_SEG (insn, is_now_linkonce_segment ()); return insn; } /* Construct a new FDE structure that begins at LABEL. */ -void +void cfi_new_fde (symbolS *label) { struct fde_entry *fde = alloc_fde_entry (); @@ -173,7 +422,7 @@ cfi_new_fde (symbolS *label) /* End the currently open FDE. */ -void +void cfi_end_fde (symbolS *label) { frchain_now->frch_cfi_data->cur_fde_data->end_address = label; @@ -192,7 +441,7 @@ cfi_set_return_column (unsigned regno) /* Universal functions to store new instructions. */ static void -cfi_add_CFA_insn(int insn) +cfi_add_CFA_insn (int insn) { struct cfi_insn_data *insn_ptr = alloc_cfi_insn_data (); @@ -258,7 +507,7 @@ cfi_add_CFA_offset (unsigned regno, offsetT offset) { unsigned int abs_data_align; - assert (DWARF2_CIE_DATA_ALIGNMENT != 0); + gas_assert (DWARF2_CIE_DATA_ALIGNMENT != 0); cfi_add_CFA_insn_reg_offset (DW_CFA_offset, regno, offset); abs_data_align = (DWARF2_CIE_DATA_ALIGNMENT < 0 @@ -326,7 +575,7 @@ cfi_add_CFA_remember_state (void) cfi_add_CFA_insn (DW_CFA_remember_state); - p = xmalloc (sizeof (*p)); + p = (struct cfa_save_data *) xmalloc (sizeof (*p)); p->cfa_offset = frchain_now->frch_cfi_data->cur_cfa_offset; p->next = frchain_now->frch_cfi_data->cfa_save_stack; frchain_now->frch_cfi_data->cfa_save_stack = p; @@ -355,8 +604,12 @@ cfi_add_CFA_restore_state (void) static void dot_cfi (int); static void dot_cfi_escape (int); +static void dot_cfi_sections (int); static void dot_cfi_startproc (int); static void dot_cfi_endproc (int); +static void dot_cfi_personality (int); +static void dot_cfi_lsda (int); +static void dot_cfi_val_encoded_addr (int); /* Fake CFI type; outside the byte range of any real CFI insn. */ #define CFI_adjust_cfa_offset 0x100 @@ -364,9 +617,11 @@ static void dot_cfi_endproc (int); #define CFI_rel_offset 0x102 #define CFI_escape 0x103 #define CFI_signal_frame 0x104 +#define CFI_val_encoded_addr 0x105 const pseudo_typeS cfi_pseudo_table[] = { + { "cfi_sections", dot_cfi_sections, 0 }, { "cfi_startproc", dot_cfi_startproc, 0 }, { "cfi_endproc", dot_cfi_endproc, 0 }, { "cfi_def_cfa", dot_cfi, DW_CFA_def_cfa }, @@ -385,6 +640,9 @@ const pseudo_typeS cfi_pseudo_table[] = { "cfi_window_save", dot_cfi, DW_CFA_GNU_window_save }, { "cfi_escape", dot_cfi_escape, 0 }, { "cfi_signal_frame", dot_cfi, CFI_signal_frame }, + { "cfi_personality", dot_cfi_personality, 0 }, + { "cfi_lsda", dot_cfi_lsda, 0 }, + { "cfi_val_encoded_addr", dot_cfi_val_encoded_addr, 0 }, { NULL, NULL, 0 } }; @@ -398,13 +656,11 @@ cfi_parse_separator (void) as_bad (_("missing separator")); } -static unsigned -cfi_parse_reg (void) +#ifndef tc_parse_to_dw2regnum +static void +tc_parse_to_dw2regnum (expressionS *exp) { - int regno; - expressionS exp; - -#ifdef tc_regname_to_dw2regnum +# ifdef tc_regname_to_dw2regnum SKIP_WHITESPACE (); if (is_name_beginner (*input_line_pointer) || (*input_line_pointer == '%' @@ -415,18 +671,24 @@ cfi_parse_reg (void) name = input_line_pointer; c = get_symbol_end (); - if ((regno = tc_regname_to_dw2regnum (name)) < 0) - { - as_bad (_("bad register expression")); - regno = 0; - } + exp->X_op = O_constant; + exp->X_add_number = tc_regname_to_dw2regnum (name); *input_line_pointer = c; - return regno; } + else +# endif + expression_and_evaluate (exp); +} #endif - expression_and_evaluate (&exp); +static unsigned +cfi_parse_reg (void) +{ + int regno; + expressionS exp; + + tc_parse_to_dw2regnum (&exp); switch (exp.X_op) { case O_register: @@ -435,9 +697,14 @@ cfi_parse_reg (void) break; default: + regno = -1; + break; + } + + if (regno < 0) + { as_bad (_("bad register expression")); regno = 0; - break; } return regno; @@ -594,7 +861,7 @@ dot_cfi_escape (int ignored ATTRIBUTE_UNUSED) tail = &head; do { - e = xmalloc (sizeof (*e)); + e = (struct cfi_escape_data *) xmalloc (sizeof (*e)); do_parse_cons_expression (&e->exp, 1); *tail = e; tail = &e->next; @@ -610,6 +877,264 @@ dot_cfi_escape (int ignored ATTRIBUTE_UNUSED) demand_empty_rest_of_line (); } +static void +dot_cfi_personality (int ignored ATTRIBUTE_UNUSED) +{ + struct fde_entry *fde; + offsetT encoding; + + if (frchain_now->frch_cfi_data == NULL) + { + as_bad (_("CFI instruction used without previous .cfi_startproc")); + ignore_rest_of_line (); + return; + } + + fde = frchain_now->frch_cfi_data->cur_fde_data; + encoding = cfi_parse_const (); + if (encoding == DW_EH_PE_omit) + { + demand_empty_rest_of_line (); + fde->per_encoding = encoding; + return; + } + + if ((encoding & 0xff) != encoding + || ((encoding & 0x70) != 0 +#if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr + && (encoding & 0x70) != DW_EH_PE_pcrel +#endif + ) + /* leb128 can be handled, but does something actually need it? */ + || (encoding & 7) == DW_EH_PE_uleb128 + || (encoding & 7) > DW_EH_PE_udata8) + { + as_bad (_("invalid or unsupported encoding in .cfi_personality")); + ignore_rest_of_line (); + return; + } + + if (*input_line_pointer++ != ',') + { + as_bad (_(".cfi_personality requires encoding and symbol arguments")); + ignore_rest_of_line (); + return; + } + + expression_and_evaluate (&fde->personality); + switch (fde->personality.X_op) + { + case O_symbol: + break; + case O_constant: + if ((encoding & 0x70) == DW_EH_PE_pcrel) + encoding = DW_EH_PE_omit; + break; + default: + encoding = DW_EH_PE_omit; + break; + } + + fde->per_encoding = encoding; + + if (encoding == DW_EH_PE_omit) + { + as_bad (_("wrong second argument to .cfi_personality")); + ignore_rest_of_line (); + return; + } + + demand_empty_rest_of_line (); +} + +static void +dot_cfi_lsda (int ignored ATTRIBUTE_UNUSED) +{ + struct fde_entry *fde; + offsetT encoding; + + if (frchain_now->frch_cfi_data == NULL) + { + as_bad (_("CFI instruction used without previous .cfi_startproc")); + ignore_rest_of_line (); + return; + } + + fde = frchain_now->frch_cfi_data->cur_fde_data; + encoding = cfi_parse_const (); + if (encoding == DW_EH_PE_omit) + { + demand_empty_rest_of_line (); + fde->lsda_encoding = encoding; + return; + } + + if ((encoding & 0xff) != encoding + || ((encoding & 0x70) != 0 +#if CFI_DIFF_LSDA_OK || defined tc_cfi_emit_pcrel_expr + && (encoding & 0x70) != DW_EH_PE_pcrel +#endif + ) + /* leb128 can be handled, but does something actually need it? */ + || (encoding & 7) == DW_EH_PE_uleb128 + || (encoding & 7) > DW_EH_PE_udata8) + { + as_bad (_("invalid or unsupported encoding in .cfi_lsda")); + ignore_rest_of_line (); + return; + } + + if (*input_line_pointer++ != ',') + { + as_bad (_(".cfi_lsda requires encoding and symbol arguments")); + ignore_rest_of_line (); + return; + } + + fde->lsda_encoding = encoding; + + expression_and_evaluate (&fde->lsda); + switch (fde->lsda.X_op) + { + case O_symbol: + break; + case O_constant: + if ((encoding & 0x70) == DW_EH_PE_pcrel) + encoding = DW_EH_PE_omit; + break; + default: + encoding = DW_EH_PE_omit; + break; + } + + fde->lsda_encoding = encoding; + + if (encoding == DW_EH_PE_omit) + { + as_bad (_("wrong second argument to .cfi_lsda")); + ignore_rest_of_line (); + return; + } + + demand_empty_rest_of_line (); +} + +static void +dot_cfi_val_encoded_addr (int ignored ATTRIBUTE_UNUSED) +{ + struct cfi_insn_data *insn_ptr; + offsetT encoding; + + if (frchain_now->frch_cfi_data == NULL) + { + as_bad (_("CFI instruction used without previous .cfi_startproc")); + ignore_rest_of_line (); + return; + } + + /* If the last address was not at the current PC, advance to current. */ + if (symbol_get_frag (frchain_now->frch_cfi_data->last_address) != frag_now + || S_GET_VALUE (frchain_now->frch_cfi_data->last_address) + != frag_now_fix ()) + cfi_add_advance_loc (symbol_temp_new_now ()); + + insn_ptr = alloc_cfi_insn_data (); + insn_ptr->insn = CFI_val_encoded_addr; + + insn_ptr->u.ea.reg = cfi_parse_reg (); + + cfi_parse_separator (); + encoding = cfi_parse_const (); + if ((encoding & 0xff) != encoding + || ((encoding & 0x70) != 0 +#if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr + && (encoding & 0x70) != DW_EH_PE_pcrel +#endif + ) + /* leb128 can be handled, but does something actually need it? */ + || (encoding & 7) == DW_EH_PE_uleb128 + || (encoding & 7) > DW_EH_PE_udata8) + { + as_bad (_("invalid or unsupported encoding in .cfi_lsda")); + encoding = DW_EH_PE_omit; + } + + cfi_parse_separator (); + expression_and_evaluate (&insn_ptr->u.ea.exp); + switch (insn_ptr->u.ea.exp.X_op) + { + case O_symbol: + break; + case O_constant: + if ((encoding & 0x70) != DW_EH_PE_pcrel) + break; + default: + encoding = DW_EH_PE_omit; + break; + } + + insn_ptr->u.ea.encoding = encoding; + if (encoding == DW_EH_PE_omit) + { + as_bad (_("wrong third argument to .cfi_val_encoded_addr")); + ignore_rest_of_line (); + return; + } + + demand_empty_rest_of_line (); +} + +/* By default emit .eh_frame only, not .debug_frame. */ +#define CFI_EMIT_eh_frame (1 << 0) +#define CFI_EMIT_debug_frame (1 << 1) +static int cfi_sections = CFI_EMIT_eh_frame; + +static void +dot_cfi_sections (int ignored ATTRIBUTE_UNUSED) +{ + int sections = 0; + + SKIP_WHITESPACE (); + if (is_name_beginner (*input_line_pointer)) + while (1) + { + char *name, c; + + name = input_line_pointer; + c = get_symbol_end (); + + if (strncmp (name, ".eh_frame", sizeof ".eh_frame") == 0 + && name[9] != '_') + sections |= CFI_EMIT_eh_frame; + else if (strncmp (name, ".debug_frame", sizeof ".debug_frame") == 0) + sections |= CFI_EMIT_debug_frame; + else + { + *input_line_pointer = c; + input_line_pointer = name; + break; + } + + *input_line_pointer = c; + SKIP_WHITESPACE (); + if (*input_line_pointer == ',') + { + name = input_line_pointer++; + SKIP_WHITESPACE (); + if (!is_name_beginner (*input_line_pointer)) + { + input_line_pointer = name; + break; + } + } + else if (is_name_beginner (*input_line_pointer)) + break; + } + + demand_empty_rest_of_line (); + cfi_sections = sections; +} + static void dot_cfi_startproc (int ignored ATTRIBUTE_UNUSED) { @@ -723,20 +1248,20 @@ output_cfi_insn (struct cfi_insn_data *insn) if (scaled <= 0x3F) out_one (DW_CFA_advance_loc + scaled); - else if (delta <= 0xFF) + else if (scaled <= 0xFF) { - out_one (DW_CFA_advance_loc1); - out_one (delta); + out_one (DW_CFA_advance_loc1); + out_one (scaled); } - else if (delta <= 0xFFFF) + else if (scaled <= 0xFFFF) { - out_one (DW_CFA_advance_loc2); - out_two (delta); + out_one (DW_CFA_advance_loc2); + out_two (scaled); } else { - out_one (DW_CFA_advance_loc4); - out_four (delta); + out_one (DW_CFA_advance_loc4); + out_four (scaled); } } else @@ -752,7 +1277,7 @@ output_cfi_insn (struct cfi_insn_data *insn) 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_more (1) = DW_CFA_advance_loc4; frag_var (rs_cfa, 4, 0, DWARF2_LINE_MIN_INSN_LENGTH << 3, make_expr_symbol (&exp), frag_now_fix () - 1, @@ -856,17 +1381,98 @@ output_cfi_insn (struct cfi_insn_data *insn) break; } + case CFI_val_encoded_addr: + { + unsigned encoding = insn->u.ea.encoding; + offsetT encoding_size; + + if (encoding == DW_EH_PE_omit) + break; + out_one (DW_CFA_val_expression); + out_uleb128 (insn->u.ea.reg); + + switch (encoding & 0x7) + { + case DW_EH_PE_absptr: + encoding_size = DWARF2_ADDR_SIZE (stdoutput); + break; + case DW_EH_PE_udata2: + encoding_size = 2; + break; + case DW_EH_PE_udata4: + encoding_size = 4; + break; + case DW_EH_PE_udata8: + encoding_size = 8; + break; + default: + abort (); + } + + /* If the user has requested absolute encoding, + then use the smaller DW_OP_addr encoding. */ + if (insn->u.ea.encoding == DW_EH_PE_absptr) + { + out_uleb128 (1 + encoding_size); + out_one (DW_OP_addr); + } + else + { + out_uleb128 (1 + 1 + encoding_size); + out_one (DW_OP_GNU_encoded_addr); + out_one (encoding); + + if ((encoding & 0x70) == DW_EH_PE_pcrel) + { +#if CFI_DIFF_EXPR_OK + insn->u.ea.exp.X_op = O_subtract; + insn->u.ea.exp.X_op_symbol = symbol_temp_new_now (); +#elif defined (tc_cfi_emit_pcrel_expr) + tc_cfi_emit_pcrel_expr (&insn->u.ea.exp, encoding_size); + break; +#else + abort (); +#endif + } + } + emit_expr (&insn->u.ea.exp, encoding_size); + } + break; + + default: + abort (); + } +} + +static offsetT +encoding_size (unsigned char encoding) +{ + if (encoding == DW_EH_PE_omit) + return 0; + switch (encoding & 0x7) + { + case 0: + return bfd_get_arch_size (stdoutput) == 64 ? 8 : 4; + case DW_EH_PE_udata2: + return 2; + case DW_EH_PE_udata4: + return 4; + case DW_EH_PE_udata8: + return 8; default: abort (); } } static void -output_cie (struct cie_entry *cie) +output_cie (struct cie_entry *cie, bfd_boolean eh_frame, int align) { symbolS *after_size_address, *end_address; expressionS exp; struct cfi_insn_data *i; + offsetT augmentation_size; + int enc; + enum dwarf2_format fmt = DWARF2_FORMAT (now_seg); cie->start_address = symbol_temp_new_now (); after_size_address = symbol_temp_make (); @@ -877,12 +1483,33 @@ output_cie (struct cie_entry *cie) exp.X_op_symbol = after_size_address; exp.X_add_number = 0; - emit_expr (&exp, 4); /* Length. */ + if (eh_frame || fmt == dwarf2_format_32bit) + emit_expr (&exp, 4); /* Length. */ + else + { + if (fmt == dwarf2_format_64bit) + out_four (-1); + emit_expr (&exp, 8); /* Length. */ + } symbol_set_value_now (after_size_address); - out_four (0); /* CIE id. */ + if (eh_frame) + out_four (0); /* CIE id. */ + else + { + out_four (-1); /* CIE id. */ + if (fmt != dwarf2_format_32bit) + out_four (-1); + } out_one (DW_CIE_VERSION); /* Version. */ - out_one ('z'); /* Augmentation. */ - out_one ('R'); + if (eh_frame) + { + out_one ('z'); /* Augmentation. */ + if (cie->per_encoding != DW_EH_PE_omit) + out_one ('P'); + if (cie->lsda_encoding != DW_EH_PE_omit) + out_one ('L'); + out_one ('R'); + } if (cie->signal_frame) out_one ('S'); out_one (0); @@ -892,27 +1519,83 @@ output_cie (struct cie_entry *cie) out_one (cie->return_column); else out_uleb128 (cie->return_column); - out_uleb128 (1); /* Augmentation size. */ -#if defined DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr - out_one (DW_EH_PE_pcrel | DW_EH_PE_sdata4); + if (eh_frame) + { + augmentation_size = 1 + (cie->lsda_encoding != DW_EH_PE_omit); + if (cie->per_encoding != DW_EH_PE_omit) + augmentation_size += 1 + encoding_size (cie->per_encoding); + out_uleb128 (augmentation_size); /* Augmentation size. */ + + if (cie->per_encoding != DW_EH_PE_omit) + { + offsetT size = encoding_size (cie->per_encoding); + out_one (cie->per_encoding); + exp = cie->personality; + if ((cie->per_encoding & 0x70) == DW_EH_PE_pcrel) + { +#if CFI_DIFF_EXPR_OK + exp.X_op = O_subtract; + exp.X_op_symbol = symbol_temp_new_now (); + emit_expr (&exp, size); +#elif defined (tc_cfi_emit_pcrel_expr) + tc_cfi_emit_pcrel_expr (&exp, size); #else - out_one (DW_EH_PE_sdata4); + abort (); +#endif + } + else + emit_expr (&exp, size); + } + + if (cie->lsda_encoding != DW_EH_PE_omit) + out_one (cie->lsda_encoding); + } + + switch (DWARF2_FDE_RELOC_SIZE) + { + case 2: + enc = DW_EH_PE_sdata2; + break; + case 4: + enc = DW_EH_PE_sdata4; + break; + case 8: + enc = DW_EH_PE_sdata8; + break; + default: + abort (); + } +#if CFI_DIFF_EXPR_OK || defined tc_cfi_emit_pcrel_expr + enc |= DW_EH_PE_pcrel; #endif + if (eh_frame) + out_one (enc); if (cie->first) - for (i = cie->first; i != cie->last; i = i->next) - output_cfi_insn (i); + { + for (i = cie->first; i != cie->last; i = i->next) + { + if (CUR_SEG (i) != CUR_SEG (cie)) + continue; + output_cfi_insn (i); + } + } - frag_align (2, DW_CFA_nop, 0); + frag_align (align, DW_CFA_nop, 0); symbol_set_value_now (end_address); } static void output_fde (struct fde_entry *fde, struct cie_entry *cie, - struct cfi_insn_data *first, int align) + bfd_boolean eh_frame, struct cfi_insn_data *first, + int align) { symbolS *after_size_address, *end_address; expressionS exp; + offsetT augmentation_size; + enum dwarf2_format fmt = DWARF2_FORMAT (now_seg); + int offset_size; + int addr_size; after_size_address = symbol_temp_make (); end_address = symbol_temp_make (); @@ -921,53 +1604,132 @@ output_fde (struct fde_entry *fde, struct cie_entry *cie, exp.X_add_symbol = end_address; exp.X_op_symbol = after_size_address; exp.X_add_number = 0; - emit_expr (&exp, 4); /* Length. */ + if (eh_frame || fmt == dwarf2_format_32bit) + offset_size = 4; + else + { + if (fmt == dwarf2_format_64bit) + out_four (-1); + offset_size = 8; + } + emit_expr (&exp, offset_size); /* Length. */ symbol_set_value_now (after_size_address); - exp.X_add_symbol = after_size_address; - exp.X_op_symbol = cie->start_address; - emit_expr (&exp, 4); /* CIE offset. */ + if (eh_frame) + { + exp.X_op = O_subtract; + exp.X_add_symbol = after_size_address; + exp.X_op_symbol = cie->start_address; + exp.X_add_number = 0; + emit_expr (&exp, offset_size); /* CIE offset. */ + } + else + { + TC_DWARF2_EMIT_OFFSET (cie->start_address, offset_size); + } -#ifdef DIFF_EXPR_OK - exp.X_add_symbol = fde->start_address; - exp.X_op_symbol = symbol_temp_new_now (); - emit_expr (&exp, 4); /* Code offset. */ + if (eh_frame) + { + exp.X_op = O_subtract; + exp.X_add_number = 0; +#if CFI_DIFF_EXPR_OK + exp.X_add_symbol = fde->start_address; + exp.X_op_symbol = symbol_temp_new_now (); + emit_expr (&exp, DWARF2_FDE_RELOC_SIZE); /* Code offset. */ #else - exp.X_op = O_symbol; - exp.X_add_symbol = fde->start_address; - exp.X_op_symbol = NULL; + exp.X_op = O_symbol; + exp.X_add_symbol = fde->start_address; #ifdef tc_cfi_emit_pcrel_expr - tc_cfi_emit_pcrel_expr (&exp, 4); /* Code offset. */ + tc_cfi_emit_pcrel_expr (&exp, DWARF2_FDE_RELOC_SIZE); /* Code offset. */ #else - emit_expr (&exp, 4); /* Code offset. */ + emit_expr (&exp, DWARF2_FDE_RELOC_SIZE); /* Code offset. */ #endif - exp.X_op = O_subtract; #endif + addr_size = DWARF2_FDE_RELOC_SIZE; + } + else + { + exp.X_op = O_symbol; + exp.X_add_symbol = fde->start_address; + exp.X_add_number = 0; + addr_size = DWARF2_ADDR_SIZE (stdoutput); + emit_expr (&exp, addr_size); + } + exp.X_op = O_subtract; exp.X_add_symbol = fde->end_address; exp.X_op_symbol = fde->start_address; /* Code length. */ - emit_expr (&exp, 4); + exp.X_add_number = 0; + emit_expr (&exp, addr_size); - out_uleb128 (0); /* Augmentation size. */ + augmentation_size = encoding_size (fde->lsda_encoding); + if (eh_frame) + out_uleb128 (augmentation_size); /* Augmentation size. */ + + if (fde->lsda_encoding != DW_EH_PE_omit) + { + exp = fde->lsda; + if ((fde->lsda_encoding & 0x70) == DW_EH_PE_pcrel) + { +#if CFI_DIFF_LSDA_OK + exp.X_op = O_subtract; + exp.X_op_symbol = symbol_temp_new_now (); + emit_expr (&exp, augmentation_size); +#elif defined (tc_cfi_emit_pcrel_expr) + tc_cfi_emit_pcrel_expr (&exp, augmentation_size); +#else + abort (); +#endif + } + else + emit_expr (&exp, augmentation_size); + } for (; first; first = first->next) - output_cfi_insn (first); + if (CUR_SEG (first) == CUR_SEG (fde)) + output_cfi_insn (first); frag_align (align, DW_CFA_nop, 0); symbol_set_value_now (end_address); } static struct cie_entry * -select_cie_for_fde (struct fde_entry *fde, struct cfi_insn_data **pfirst) +select_cie_for_fde (struct fde_entry *fde, bfd_boolean eh_frame, + struct cfi_insn_data **pfirst, int align) { struct cfi_insn_data *i, *j; struct cie_entry *cie; for (cie = cie_root; cie; cie = cie->next) { + if (CUR_SEG (cie) != CUR_SEG (fde)) + continue; if (cie->return_column != fde->return_column - || cie->signal_frame != fde->signal_frame) + || cie->signal_frame != fde->signal_frame + || cie->per_encoding != fde->per_encoding + || cie->lsda_encoding != fde->lsda_encoding) continue; + if (cie->per_encoding != DW_EH_PE_omit) + { + if (cie->personality.X_op != fde->personality.X_op + || cie->personality.X_add_number + != fde->personality.X_add_number) + continue; + switch (cie->personality.X_op) + { + case O_constant: + if (cie->personality.X_unsigned != fde->personality.X_unsigned) + continue; + break; + case O_symbol: + if (cie->personality.X_add_symbol + != fde->personality.X_add_symbol) + continue; + break; + default: + abort (); + } + } for (i = cie->first, j = fde->data; i != cie->last && j != NULL; i = i->next, j = j->next) @@ -1011,6 +1773,7 @@ select_cie_for_fde (struct fde_entry *fde, struct cfi_insn_data **pfirst) break; case CFI_escape: + case CFI_val_encoded_addr: /* Don't bother matching these for now. */ goto fail; @@ -1026,7 +1789,8 @@ select_cie_for_fde (struct fde_entry *fde, struct cfi_insn_data **pfirst) && (!j || j->insn == DW_CFA_advance_loc || j->insn == DW_CFA_remember_state - || j->insn == CFI_escape)) + || j->insn == CFI_escape + || j->insn == CFI_val_encoded_addr)) { *pfirst = j; return cie; @@ -1035,62 +1799,298 @@ select_cie_for_fde (struct fde_entry *fde, struct cfi_insn_data **pfirst) fail:; } - cie = xmalloc (sizeof (struct cie_entry)); + cie = (struct cie_entry *) xmalloc (sizeof (struct cie_entry)); cie->next = cie_root; cie_root = cie; + SET_CUR_SEG (cie, CUR_SEG (fde)); cie->return_column = fde->return_column; cie->signal_frame = fde->signal_frame; + cie->per_encoding = fde->per_encoding; + cie->lsda_encoding = fde->lsda_encoding; + cie->personality = fde->personality; cie->first = fde->data; for (i = cie->first; i ; i = i->next) if (i->insn == DW_CFA_advance_loc || i->insn == DW_CFA_remember_state - || i->insn == CFI_escape) + || i->insn == CFI_escape + || i->insn == CFI_val_encoded_addr) break; cie->last = i; *pfirst = i; - - output_cie (cie); + + output_cie (cie, eh_frame, align); return cie; } +#ifdef md_reg_eh_frame_to_debug_frame +static void +cfi_change_reg_numbers (struct cfi_insn_data *insn, segT ccseg) +{ + for (; insn; insn = insn->next) + { + if (CUR_SEG (insn) != ccseg) + continue; + switch (insn->insn) + { + case DW_CFA_advance_loc: + case DW_CFA_def_cfa_offset: + case DW_CFA_remember_state: + case DW_CFA_restore_state: + case DW_CFA_GNU_window_save: + case CFI_escape: + break; + + case DW_CFA_def_cfa: + case DW_CFA_offset: + insn->u.ri.reg = md_reg_eh_frame_to_debug_frame (insn->u.ri.reg); + break; + + case DW_CFA_def_cfa_register: + case DW_CFA_undefined: + case DW_CFA_same_value: + case DW_CFA_restore: + insn->u.r = md_reg_eh_frame_to_debug_frame (insn->u.r); + break; + + case DW_CFA_register: + insn->u.rr.reg1 = md_reg_eh_frame_to_debug_frame (insn->u.rr.reg1); + insn->u.rr.reg2 = md_reg_eh_frame_to_debug_frame (insn->u.rr.reg2); + break; + + case CFI_val_encoded_addr: + insn->u.ea.reg = md_reg_eh_frame_to_debug_frame (insn->u.ea.reg); + break; + + default: + abort (); + } + } +} +#else +#define cfi_change_reg_numbers(insn, cseg) do { } while (0) +#endif + +static segT +get_cfi_seg (segT cseg, const char *base, flagword flags, int align) +{ + if (SUPPORT_FRAME_LINKONCE) + { + struct dwcfi_seg_list *l; + + l = dwcfi_hash_find_or_make (cseg, base, flags); + + cseg = l->seg; + subseg_set (cseg, l->subseg); + } + else + { + cseg = subseg_new (base, 0); + bfd_set_section_flags (stdoutput, cseg, flags); + } + record_alignment (cseg, align); + return cseg; +} + void cfi_finish (void) { - segT cfi_seg; + struct cie_entry *cie, *cie_next; + segT cfi_seg, ccseg; struct fde_entry *fde; - int save_flag_traditional_format; + struct cfi_insn_data *first; + int save_flag_traditional_format, seek_next_seg; if (all_fde_data == 0) return; - /* Open .eh_frame section. */ - cfi_seg = subseg_new (".eh_frame", 0); - bfd_set_section_flags (stdoutput, cfi_seg, - SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_READONLY); - subseg_set (cfi_seg, 0); - record_alignment (cfi_seg, EH_FRAME_ALIGNMENT); + if ((cfi_sections & CFI_EMIT_eh_frame) != 0) + { + /* Make sure check_eh_frame doesn't do anything with our output. */ + save_flag_traditional_format = flag_traditional_format; + flag_traditional_format = 1; - /* Make sure check_eh_frame doesn't do anything with our output. */ - save_flag_traditional_format = flag_traditional_format; - flag_traditional_format = 1; + if (!SUPPORT_FRAME_LINKONCE) + { + /* Open .eh_frame section. */ + cfi_seg = get_cfi_seg (NULL, ".eh_frame", + (SEC_ALLOC | SEC_LOAD | SEC_DATA + | DWARF2_EH_FRAME_READ_ONLY), + EH_FRAME_ALIGNMENT); +#ifdef md_fix_up_eh_frame + md_fix_up_eh_frame (cfi_seg); +#else + (void) cfi_seg; +#endif + } + + do + { + ccseg = NULL; + seek_next_seg = 0; + + for (cie = cie_root; cie; cie = cie_next) + { + cie_next = cie->next; + free ((void *) cie); + } + cie_root = NULL; + + for (fde = all_fde_data; fde ; fde = fde->next) + { + if (SUPPORT_FRAME_LINKONCE) + { + if (HANDLED (fde)) + continue; + if (seek_next_seg && CUR_SEG (fde) != ccseg) + { + seek_next_seg = 2; + continue; + } + if (!seek_next_seg) + { + ccseg = CUR_SEG (fde); + /* Open .eh_frame section. */ + cfi_seg = get_cfi_seg (ccseg, ".eh_frame", + (SEC_ALLOC | SEC_LOAD | SEC_DATA + | DWARF2_EH_FRAME_READ_ONLY), + EH_FRAME_ALIGNMENT); +#ifdef md_fix_up_eh_frame + md_fix_up_eh_frame (cfi_seg); +#else + (void) cfi_seg; +#endif + seek_next_seg = 1; + } + SET_HANDLED (fde, 1); + } + + if (fde->end_address == NULL) + { + as_bad (_("open CFI at the end of file; missing .cfi_endproc directive")); + fde->end_address = fde->start_address; + } + + cie = select_cie_for_fde (fde, TRUE, &first, 2); + output_fde (fde, cie, TRUE, first, + fde->next == NULL ? EH_FRAME_ALIGNMENT : 2); + } + } + while (SUPPORT_FRAME_LINKONCE && seek_next_seg == 2); - for (fde = all_fde_data; fde ; fde = fde->next) + if (SUPPORT_FRAME_LINKONCE) + for (fde = all_fde_data; fde ; fde = fde->next) + SET_HANDLED (fde, 0); + + flag_traditional_format = save_flag_traditional_format; + } + + if ((cfi_sections & CFI_EMIT_debug_frame) != 0) { - struct cfi_insn_data *first; - struct cie_entry *cie; + int alignment = ffs (DWARF2_ADDR_SIZE (stdoutput)) - 1; - if (fde->end_address == NULL) - { - as_bad (_("open CFI at the end of file; missing .cfi_endproc directive")); - fde->end_address = fde->start_address; + if (!SUPPORT_FRAME_LINKONCE) + get_cfi_seg (NULL, ".debug_frame", + SEC_READONLY | SEC_DEBUGGING, + alignment); + + do + { + ccseg = NULL; + seek_next_seg = 0; + + for (cie = cie_root; cie; cie = cie_next) + { + cie_next = cie->next; + free ((void *) cie); + } + cie_root = NULL; + + for (fde = all_fde_data; fde ; fde = fde->next) + { + if (SUPPORT_FRAME_LINKONCE) + { + if (HANDLED (fde)) + continue; + if (seek_next_seg && CUR_SEG (fde) != ccseg) + { + seek_next_seg = 2; + continue; + } + if (!seek_next_seg) + { + ccseg = CUR_SEG (fde); + /* Open .debug_frame section. */ + get_cfi_seg (ccseg, ".debug_frame", + SEC_READONLY | SEC_DEBUGGING, + alignment); + seek_next_seg = 1; + } + SET_HANDLED (fde, 1); + } + if (fde->end_address == NULL) + { + as_bad (_("open CFI at the end of file; missing .cfi_endproc directive")); + fde->end_address = fde->start_address; + } + + fde->per_encoding = DW_EH_PE_omit; + fde->lsda_encoding = DW_EH_PE_omit; + cfi_change_reg_numbers (fde->data, ccseg); + cie = select_cie_for_fde (fde, FALSE, &first, alignment); + output_fde (fde, cie, FALSE, first, alignment); + } } + while (SUPPORT_FRAME_LINKONCE && seek_next_seg == 2); - cie = select_cie_for_fde (fde, &first); - output_fde (fde, cie, first, fde->next == NULL ? EH_FRAME_ALIGNMENT : 2); + if (SUPPORT_FRAME_LINKONCE) + for (fde = all_fde_data; fde ; fde = fde->next) + SET_HANDLED (fde, 0); } +} + +#else /* TARGET_USE_CFIPOP */ - flag_traditional_format = save_flag_traditional_format; +/* Emit an intelligible error message for missing support. */ + +static void +dot_cfi_dummy (int ignored ATTRIBUTE_UNUSED) +{ + as_bad (_("CFI is not supported for this target")); + ignore_rest_of_line (); +} + +const pseudo_typeS cfi_pseudo_table[] = + { + { "cfi_sections", dot_cfi_dummy, 0 }, + { "cfi_startproc", dot_cfi_dummy, 0 }, + { "cfi_endproc", dot_cfi_dummy, 0 }, + { "cfi_def_cfa", dot_cfi_dummy, 0 }, + { "cfi_def_cfa_register", dot_cfi_dummy, 0 }, + { "cfi_def_cfa_offset", dot_cfi_dummy, 0 }, + { "cfi_adjust_cfa_offset", dot_cfi_dummy, 0 }, + { "cfi_offset", dot_cfi_dummy, 0 }, + { "cfi_rel_offset", dot_cfi_dummy, 0 }, + { "cfi_register", dot_cfi_dummy, 0 }, + { "cfi_return_column", dot_cfi_dummy, 0 }, + { "cfi_restore", dot_cfi_dummy, 0 }, + { "cfi_undefined", dot_cfi_dummy, 0 }, + { "cfi_same_value", dot_cfi_dummy, 0 }, + { "cfi_remember_state", dot_cfi_dummy, 0 }, + { "cfi_restore_state", dot_cfi_dummy, 0 }, + { "cfi_window_save", dot_cfi_dummy, 0 }, + { "cfi_escape", dot_cfi_dummy, 0 }, + { "cfi_signal_frame", dot_cfi_dummy, 0 }, + { "cfi_personality", dot_cfi_dummy, 0 }, + { "cfi_lsda", dot_cfi_dummy, 0 }, + { "cfi_val_encoded_addr", dot_cfi_dummy, 0 }, + { NULL, NULL, 0 } + }; + +void +cfi_finish (void) +{ } +#endif /* TARGET_USE_CFIPOP */