projects / thirdparty / binutils-gdb.git / blame
| Commit | Line | Data |
|---|---|---|
| 987499b2 KT |
1 | /* Short overview: |
| 2 | There are at the moment three different function entry formats preset. | |
| 3 | The first is the MIPS one. The second version | |
| 4 | is for ARM, PPC, SH3, and SH4 mainly for Windows CE. | |
| 5 | The third is the IA64 and x64 version. Note, the IA64 isn't implemented yet, | |
| 6 | but to find information about it, please see specification about IA64 on | |
| 7 | http://download.intel.com/design/Itanium/Downloads/245358.pdf file. | |
| 8 | ||
| 9 | The first version has just entries in the pdata section: BeginAddress, | |
| 10 | EndAddress, ExceptionHandler, HandlerData, and PrologueEndAddress. Each | |
| 11 | value is a pointer to the corresponding data and has size of 4 bytes. | |
| 12 | ||
| 13 | The second variant has the following entries in the pdata section. | |
| 14 | BeginAddress, PrologueLength (8 bits), EndAddress (22 bits), | |
| 15 | Use-32-bit-instruction (1 bit), and Exception-Handler-Exists (1 bit). | |
| 16 | If the FunctionLength is zero, or the Exception-Handler-Exists bit | |
| 17 | is true, a PDATA_EH block is placed directly before function entry. | |
| 18 | ||
| 19 | The third version has a function entry block of BeginAddress (RVA), | |
| 20 | EndAddress (RVA), and UnwindData (RVA). The description of the | |
| 21 | prologue, excepetion-handler, and additional SEH data is stored | |
| 22 | within the UNWIND_DATA field in the xdata section. | |
| 23 | ||
| 24 | The pseudos: | |
| 25 | .seh_proc <fct_name> | |
| 26 | .seh_endprologue | |
| 27 | .seh_handler <handler>[,<handler-data>]] | |
| 28 | .seh_eh | |
| 29 | .seh_32/.seh_no32 | |
| 30 | .seh_endproc | |
| 31 | .seh_setframe <reg>,<offset> | |
| 32 | .seh_stackalloc | |
| 33 | .seh_pushreg | |
| 34 | .seh_savereg | |
| 35 | .seh_savemm | |
| 36 | .seh_savexmm | |
| 37 | .seh_pushframe | |
| 38 | .seh_scope | |
| 39 | */ | |
| 40 | ||
| 41 | /* architecture specific pdata/xdata handling. */ | |
| 42 | #define SEH_CMDS \ | |
| 43 | {"seh_proc", obj_coff_seh_proc, 0}, \ | |
| 44 | {"seh_endproc", obj_coff_seh_endproc, 0}, \ | |
| 45 | {"seh_pushreg", obj_coff_seh_push, 0}, \ | |
| 46 | {"seh_savereg", obj_coff_seh_save, 0}, \ | |
| 47 | {"seh_savemm", obj_coff_seh_save, 1}, \ | |
| 48 | {"seh_savexmm", obj_coff_seh_save, 2}, \ | |
| 49 | {"seh_pushframe", obj_coff_seh_push, 1}, \ | |
| 50 | {"seh_endprologue", obj_coff_seh_endprologue, 0}, \ | |
| 51 | {"seh_setframe", obj_coff_seh_setframe, 0}, \ | |
| 52 | {"seh_stackalloc", obj_coff_seh_stack_alloc, 0}, \ | |
| 53 | {"seh_handler", obj_coff_seh_handler, 0}, \ | |
| 54 | {"seh_eh", obj_coff_seh_eh, 0}, \ | |
| 55 | {"seh_32", obj_coff_seh_32, 1}, \ | |
| 56 | {"seh_no32", obj_coff_seh_32, 0}, \ | |
| 57 | {"seh_scope", obj_coff_seh_scope, 0}, | |
| 58 | ||
| 59 | /* Type definitions. */ | |
| 60 | ||
| 61 | typedef struct seh_prologue_element | |
| 62 | { | |
| 63 | symbolS *pc_addr; | |
| 64 | char *pc_symbol; | |
| 65 | int kind; | |
| 66 | int reg; | |
| 67 | bfd_vma offset; | |
| 68 | } seh_prologue_element; | |
| 69 | ||
| 70 | typedef struct seh_scope_elem { | |
| 71 | char *begin_addr; | |
| 72 | char *end_addr; | |
| 73 | char *handler_addr; | |
| 74 | char *jump_addr; | |
| 75 | } seh_scope_elem; | |
| 76 | ||
| 77 | typedef struct seh_context | |
| 78 | { | |
| 79 | struct seh_context *next; | |
| 80 | /* Was record alread processed. */ | |
| 81 | int done; | |
| 82 | /* Function name. */ | |
| 83 | char *func_name; | |
| 84 | /* BeginAddress. */ | |
| 85 | char *start_symbol; | |
| 86 | symbolS *start_addr; | |
| 87 | bfd_vma start_offset; | |
| 88 | /* EndAddress. */ | |
| 89 | char *end_symbol; | |
| 90 | symbolS *end_addr; | |
| 91 | bfd_vma end_offset; | |
| 92 | /* PrologueEnd. */ | |
| 93 | char *endprologue_symbol; | |
| 94 | symbolS *endprologue_addr; | |
| 95 | bfd_vma endprologue_offset; | |
| 96 | /* ExceptionHandler. */ | |
| 97 | char *handler_name; | |
| 98 | /* ExceptionHandlerData. */ | |
| 99 | char *handler_data_name; | |
| 100 | int handler_written; | |
| 101 | /* WinCE specific data. */ | |
| 102 | int use_instruction_32; | |
| 103 | ||
| 104 | /* the bfd to store data within. */ | |
| 105 | bfd *abfd; | |
| 106 | /* the current section to generate data within. */ | |
| 107 | asection *section; | |
| 108 | /* Relocations for section. */ | |
| 109 | unsigned int count_reloc; | |
| 110 | /* Symbols within section. */ | |
| 111 | unsigned int count_syms; | |
| 112 | /* Iterator for text lable generation. */ | |
| 113 | unsigned int tlbl_count; | |
| 114 | /* Iterator for xdata lable generation. */ | |
| 115 | unsigned int xlbl_count; | |
| 116 | /* The name of the first xdata label. */ | |
| 117 | char *xdata_first; | |
| 118 | /* FIelds used for x64 generation of chained information. */ | |
| 119 | char **xdata_names; | |
| 120 | char **xdata_pcsyms; | |
| 121 | int *xdata_elm_start; | |
| 122 | /* Size and offset within current generated xdata section. */ | |
| 123 | size_t xdata_sz; | |
| 124 | size_t xdata_offset; | |
| 125 | /* x64 framereg and frame offset information. */ | |
| 126 | int framereg; | |
| 127 | bfd_vma frameoff; | |
| 128 | /* Information about x64 specific unwind data fields. */ | |
| 129 | size_t elems_count; | |
| 130 | size_t elems_max; | |
| 131 | seh_prologue_element *elems; | |
| 132 | size_t scope_max; | |
| 133 | size_t scope_count; | |
| 134 | seh_scope_elem *scopes; | |
| 135 | } seh_context; | |
| 136 | ||
| 137 | typedef enum seh_kind { | |
| 138 | seh_kind_unknown = 0, | |
| 139 | seh_kind_mips = 1, /* Used for MIPS and x86 pdata generation. */ | |
| 140 | seh_kind_arm = 2, /* Used for ARM, PPC, SH3, and SH4 pdata (PDATA_EH) generation. */ | |
| 141 | seh_kind_x64 = 3 /* Used for IA64 and x64 pdata/xdata generation. */ | |
| 142 | } seh_kind; | |
| 143 | ||
| 144 | /* Forward declarations. */ | |
| 145 | static void obj_coff_seh_stack_alloc (int); | |
| 146 | static void obj_coff_seh_setframe (int); | |
| 147 | static void obj_coff_seh_endprologue (int); | |
| 148 | static void obj_coff_seh_save (int); | |
| 149 | static void obj_coff_seh_push (int); | |
| 150 | static void obj_coff_seh_endproc (int); | |
| 151 | static void obj_coff_seh_eh (int); | |
| 152 | static void obj_coff_seh_32 (int); | |
| 153 | static void obj_coff_seh_proc (int); | |
| 154 | static void obj_coff_seh_handler (int); | |
| 155 | static void obj_coff_seh_scope (int); | |
| 156 | static int seh_read_offset (const char *, bfd_vma *); | |
| 157 | static int seh_x64_read_reg (const char *, int, int *); | |
| 158 | static void seh_x64_make_prologue_element (int, int, bfd_vma); | |
| 159 | static void make_function_entry_pdata (seh_context *c); | |
| 160 | ||
| 161 | #define UNDSEC (asection *) &bfd_und_section |