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TOMOYO Linux Cross Reference
Linux/scripts/recordmcount.h

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Diff markup

Differences between /scripts/recordmcount.h (Version linux-6.12-rc7) and /scripts/recordmcount.h (Version unix-v6-master)


  1 /* SPDX-License-Identifier: GPL-2.0-only */         1 
  2 /*                                                
  3  * recordmcount.h                                 
  4  *                                                
  5  * This code was taken out of recordmcount.c w    
  6  * Copyright 2009 John F. Reiser <jreiser@BitW    
  7  *                                                
  8  * The original code had the same algorithms f    
  9  * and 64bit ELF files, but the code was dupli    
 10  * the difference in structures that were used    
 11  * file creates a macro of everything that is     
 12  * the 64 and 32 bit code, such that by includ    
 13  * twice we can create both sets of functions     
 14  * header once with RECORD_MCOUNT_64 undefined    
 15  * it defined.                                    
 16  *                                                
 17  * This conversion to macros was done by:         
 18  * Copyright 2010 Steven Rostedt <srostedt@red    
 19  */                                               
 20 #undef append_func                                
 21 #undef is_fake_mcount                             
 22 #undef fn_is_fake_mcount                          
 23 #undef MIPS_is_fake_mcount                        
 24 #undef mcount_adjust                              
 25 #undef sift_rel_mcount                            
 26 #undef nop_mcount                                 
 27 #undef find_secsym_ndx                            
 28 #undef __has_rel_mcount                           
 29 #undef has_rel_mcount                             
 30 #undef tot_relsize                                
 31 #undef get_mcountsym                              
 32 #undef find_symtab                                
 33 #undef get_shnum                                  
 34 #undef set_shnum                                  
 35 #undef get_shstrndx                               
 36 #undef get_symindex                               
 37 #undef get_sym_str_and_relp                       
 38 #undef do_func                                    
 39 #undef Elf_Addr                                   
 40 #undef Elf_Ehdr                                   
 41 #undef Elf_Shdr                                   
 42 #undef Elf_Rel                                    
 43 #undef Elf_Rela                                   
 44 #undef Elf_Sym                                    
 45 #undef ELF_R_SYM                                  
 46 #undef Elf_r_sym                                  
 47 #undef ELF_R_INFO                                 
 48 #undef Elf_r_info                                 
 49 #undef ELF_ST_BIND                                
 50 #undef ELF_ST_TYPE                                
 51 #undef fn_ELF_R_SYM                               
 52 #undef fn_ELF_R_INFO                              
 53 #undef uint_t                                     
 54 #undef _w                                         
 55 #undef _align                                     
 56 #undef _size                                      
 57                                                   
 58 #ifdef RECORD_MCOUNT_64                           
 59 # define append_func            append64          
 60 # define sift_rel_mcount        sift64_rel_mco    
 61 # define nop_mcount             nop_mcount_64     
 62 # define find_secsym_ndx        find64_secsym_    
 63 # define __has_rel_mcount       __has64_rel_mc    
 64 # define has_rel_mcount         has64_rel_mcou    
 65 # define tot_relsize            tot64_relsize     
 66 # define find_symtab            find_symtab64     
 67 # define get_shnum              get_shnum64       
 68 # define set_shnum              set_shnum64       
 69 # define get_shstrndx           get_shstrndx64    
 70 # define get_symindex           get_symindex64    
 71 # define get_sym_str_and_relp   get_sym_str_an    
 72 # define do_func                do64              
 73 # define get_mcountsym          get_mcountsym_    
 74 # define is_fake_mcount         is_fake_mcount    
 75 # define fn_is_fake_mcount      fn_is_fake_mco    
 76 # define MIPS_is_fake_mcount    MIPS64_is_fake    
 77 # define mcount_adjust          mcount_adjust_    
 78 # define Elf_Addr               Elf64_Addr        
 79 # define Elf_Ehdr               Elf64_Ehdr        
 80 # define Elf_Shdr               Elf64_Shdr        
 81 # define Elf_Rel                Elf64_Rel         
 82 # define Elf_Rela               Elf64_Rela        
 83 # define Elf_Sym                Elf64_Sym         
 84 # define ELF_R_SYM              ELF64_R_SYM       
 85 # define Elf_r_sym              Elf64_r_sym       
 86 # define ELF_R_INFO             ELF64_R_INFO      
 87 # define Elf_r_info             Elf64_r_info      
 88 # define ELF_ST_BIND            ELF64_ST_BIND     
 89 # define ELF_ST_TYPE            ELF64_ST_TYPE     
 90 # define fn_ELF_R_SYM           fn_ELF64_R_SYM    
 91 # define fn_ELF_R_INFO          fn_ELF64_R_INF    
 92 # define uint_t                 uint64_t          
 93 # define _w                     w8                
 94 # define _align                 7u                
 95 # define _size                  8                 
 96 #else                                             
 97 # define append_func            append32          
 98 # define sift_rel_mcount        sift32_rel_mco    
 99 # define nop_mcount             nop_mcount_32     
100 # define find_secsym_ndx        find32_secsym_    
101 # define __has_rel_mcount       __has32_rel_mc    
102 # define has_rel_mcount         has32_rel_mcou    
103 # define tot_relsize            tot32_relsize     
104 # define find_symtab            find_symtab32     
105 # define get_shnum              get_shnum32       
106 # define set_shnum              set_shnum32       
107 # define get_shstrndx           get_shstrndx32    
108 # define get_symindex           get_symindex32    
109 # define get_sym_str_and_relp   get_sym_str_an    
110 # define do_func                do32              
111 # define get_mcountsym          get_mcountsym_    
112 # define is_fake_mcount         is_fake_mcount    
113 # define fn_is_fake_mcount      fn_is_fake_mco    
114 # define MIPS_is_fake_mcount    MIPS32_is_fake    
115 # define mcount_adjust          mcount_adjust_    
116 # define Elf_Addr               Elf32_Addr        
117 # define Elf_Ehdr               Elf32_Ehdr        
118 # define Elf_Shdr               Elf32_Shdr        
119 # define Elf_Rel                Elf32_Rel         
120 # define Elf_Rela               Elf32_Rela        
121 # define Elf_Sym                Elf32_Sym         
122 # define ELF_R_SYM              ELF32_R_SYM       
123 # define Elf_r_sym              Elf32_r_sym       
124 # define ELF_R_INFO             ELF32_R_INFO      
125 # define Elf_r_info             Elf32_r_info      
126 # define ELF_ST_BIND            ELF32_ST_BIND     
127 # define ELF_ST_TYPE            ELF32_ST_TYPE     
128 # define fn_ELF_R_SYM           fn_ELF32_R_SYM    
129 # define fn_ELF_R_INFO          fn_ELF32_R_INF    
130 # define uint_t                 uint32_t          
131 # define _w                     w                 
132 # define _align                 3u                
133 # define _size                  4                 
134 #endif                                            
135                                                   
136 /* Functions and pointers that do_file() may o    
137 static int fn_is_fake_mcount(Elf_Rel const *rp    
138 {                                                 
139         return 0;                                 
140 }                                                 
141 static int (*is_fake_mcount)(Elf_Rel const *rp    
142                                                   
143 static uint_t fn_ELF_R_SYM(Elf_Rel const *rp)     
144 {                                                 
145         return ELF_R_SYM(_w(rp->r_info));         
146 }                                                 
147 static uint_t (*Elf_r_sym)(Elf_Rel const *rp)     
148                                                   
149 static void fn_ELF_R_INFO(Elf_Rel *const rp, u    
150 {                                                 
151         rp->r_info = _w(ELF_R_INFO(sym, type))    
152 }                                                 
153 static void (*Elf_r_info)(Elf_Rel *const rp, u    
154                                                   
155 static int mcount_adjust = 0;                     
156                                                   
157 /*                                                
158  * MIPS mcount long call has 2 _mcount symbols    
159  * _mcount symbol is needed for dynamic functi    
160  * tracing(ftrace_make_nop), the instruction i    
161  * the "b label" instruction, to enable tracin    
162  * instruction back. So, here, we set the 2nd     
163  *                                                
164  * c:   3c030000        lui     v1,0x0            
165  *              c: R_MIPS_HI16  _mcount           
166  *              c: R_MIPS_NONE  *ABS*             
167  *              c: R_MIPS_NONE  *ABS*             
168  * 10:  64630000        daddiu  v1,v1,0           
169  *              10: R_MIPS_LO16 _mcount           
170  *              10: R_MIPS_NONE *ABS*             
171  *              10: R_MIPS_NONE *ABS*             
172  * 14:  03e0082d        move    at,ra             
173  * 18:  0060f809        jalr    v1                
174  * label:                                         
175  */                                               
176 #define MIPS_FAKEMCOUNT_OFFSET  4                 
177                                                   
178 static int MIPS_is_fake_mcount(Elf_Rel const *    
179 {                                                 
180         static Elf_Addr old_r_offset = ~(Elf_A    
181         Elf_Addr current_r_offset = _w(rp->r_o    
182         int is_fake;                              
183                                                   
184         is_fake = (old_r_offset != ~(Elf_Addr)    
185                 (current_r_offset - old_r_offs    
186         old_r_offset = current_r_offset;          
187                                                   
188         return is_fake;                           
189 }                                                 
190                                                   
191 static unsigned int get_symindex(Elf_Sym const    
192                                  Elf32_Word co    
193 {                                                 
194         unsigned long offset;                     
195         unsigned short shndx = w2(sym->st_shnd    
196         int index;                                
197                                                   
198         if (shndx > SHN_UNDEF && shndx < SHN_L    
199                 return shndx;                     
200                                                   
201         if (shndx == SHN_XINDEX) {                
202                 offset = (unsigned long)sym -     
203                 index = offset / sizeof(*sym);    
204                                                   
205                 return w(symtab_shndx[index]);    
206         }                                         
207                                                   
208         return 0;                                 
209 }                                                 
210                                                   
211 static unsigned int get_shnum(Elf_Ehdr const *    
212 {                                                 
213         if (shdr0 && !ehdr->e_shnum)              
214                 return w(shdr0->sh_size);         
215                                                   
216         return w2(ehdr->e_shnum);                 
217 }                                                 
218                                                   
219 static void set_shnum(Elf_Ehdr *ehdr, Elf_Shdr    
220 {                                                 
221         if (new_shnum >= SHN_LORESERVE) {         
222                 ehdr->e_shnum = 0;                
223                 shdr0->sh_size = w(new_shnum);    
224         } else                                    
225                 ehdr->e_shnum = w2(new_shnum);    
226 }                                                 
227                                                   
228 static int get_shstrndx(Elf_Ehdr const *ehdr,     
229 {                                                 
230         if (ehdr->e_shstrndx != SHN_XINDEX)       
231                 return w2(ehdr->e_shstrndx);      
232                                                   
233         return w(shdr0->sh_link);                 
234 }                                                 
235                                                   
236 static void find_symtab(Elf_Ehdr *const ehdr,     
237                         unsigned const nhdr, E    
238                         Elf32_Word **symtab_sh    
239 {                                                 
240         Elf_Shdr const *relhdr;                   
241         unsigned k;                               
242                                                   
243         *symtab = NULL;                           
244         *symtab_shndx = NULL;                     
245                                                   
246         for (relhdr = shdr0, k = nhdr; k; --k,    
247                 if (relhdr->sh_type == SHT_SYM    
248                         *symtab = (void *)ehdr    
249                 else if (relhdr->sh_type == SH    
250                         *symtab_shndx = (void     
251                                                   
252                 if (*symtab && *symtab_shndx)     
253                         break;                    
254         }                                         
255 }                                                 
256                                                   
257 /* Append the new shstrtab, Elf_Shdr[], __mcou    
258 static int append_func(Elf_Ehdr *const ehdr,      
259                         Elf_Shdr *const shstr,    
260                         uint_t const *const ml    
261                         uint_t const *const ml    
262                         Elf_Rel const *const m    
263                         Elf_Rel const *const m    
264                         unsigned int const rel    
265                         unsigned int const sym    
266 {                                                 
267         /* Begin constructing output file */      
268         Elf_Shdr mcsec;                           
269         char const *mc_name = (sizeof(Elf_Rela    
270                 ? ".rela__mcount_loc"             
271                 :  ".rel__mcount_loc";            
272         uint_t const old_shoff = _w(ehdr->e_sh    
273         uint_t const old_shstr_sh_size   = _w(    
274         uint_t const old_shstr_sh_offset = _w(    
275         Elf_Shdr *const shdr0 = (Elf_Shdr *)(o    
276         unsigned int const old_shnum = get_shn    
277         unsigned int const new_shnum = 2 + old    
278         uint_t t = 1 + strlen(mc_name) + _w(sh    
279         uint_t new_e_shoff;                       
280                                                   
281         shstr->sh_size = _w(t);                   
282         shstr->sh_offset = _w(sb.st_size);        
283         t += sb.st_size;                          
284         t += (_align & -t);  /* word-byte alig    
285         new_e_shoff = t;                          
286                                                   
287         set_shnum(ehdr, shdr0, new_shnum);        
288                                                   
289         /* body for new shstrtab */               
290         if (ulseek(sb.st_size, SEEK_SET) < 0)     
291                 return -1;                        
292         if (uwrite(old_shstr_sh_offset + (void    
293                 return -1;                        
294         if (uwrite(mc_name, 1 + strlen(mc_name    
295                 return -1;                        
296                                                   
297         /* old(modified) Elf_Shdr table, word-    
298         if (ulseek(t, SEEK_SET) < 0)              
299                 return -1;                        
300         t += sizeof(Elf_Shdr) * old_shnum;        
301         if (uwrite(old_shoff + (void *)ehdr,      
302                sizeof(Elf_Shdr) * old_shnum) <    
303                 return -1;                        
304                                                   
305         /* new sections __mcount_loc and .rel_    
306         t += 2*sizeof(mcsec);                     
307         mcsec.sh_name = w((sizeof(Elf_Rela) ==    
308                 + old_shstr_sh_size);             
309         mcsec.sh_type = w(SHT_PROGBITS);          
310         mcsec.sh_flags = _w(SHF_ALLOC);           
311         mcsec.sh_addr = 0;                        
312         mcsec.sh_offset = _w(t);                  
313         mcsec.sh_size = _w((void *)mlocp - (vo    
314         mcsec.sh_link = 0;                        
315         mcsec.sh_info = 0;                        
316         mcsec.sh_addralign = _w(_size);           
317         mcsec.sh_entsize = _w(_size);             
318         if (uwrite(&mcsec, sizeof(mcsec)) < 0)    
319                 return -1;                        
320                                                   
321         mcsec.sh_name = w(old_shstr_sh_size);     
322         mcsec.sh_type = (sizeof(Elf_Rela) == r    
323                 ? w(SHT_RELA)                     
324                 : w(SHT_REL);                     
325         mcsec.sh_flags = 0;                       
326         mcsec.sh_addr = 0;                        
327         mcsec.sh_offset = _w((void *)mlocp - (    
328         mcsec.sh_size   = _w((void *)mrelp - (    
329         mcsec.sh_link = w(symsec_sh_link);        
330         mcsec.sh_info = w(old_shnum);             
331         mcsec.sh_addralign = _w(_size);           
332         mcsec.sh_entsize = _w(rel_entsize);       
333                                                   
334         if (uwrite(&mcsec, sizeof(mcsec)) < 0)    
335                 return -1;                        
336                                                   
337         if (uwrite(mloc0, (void *)mlocp - (voi    
338                 return -1;                        
339         if (uwrite(mrel0, (void *)mrelp - (voi    
340                 return -1;                        
341                                                   
342         ehdr->e_shoff = _w(new_e_shoff);          
343         if (ulseek(0, SEEK_SET) < 0)              
344                 return -1;                        
345         if (uwrite(ehdr, sizeof(*ehdr)) < 0)      
346                 return -1;                        
347         return 0;                                 
348 }                                                 
349                                                   
350 static unsigned get_mcountsym(Elf_Sym const *c    
351                               Elf_Rel const *r    
352                               char const *cons    
353 {                                                 
354         unsigned mcountsym = 0;                   
355                                                   
356         Elf_Sym const *const symp =               
357                 &sym0[Elf_r_sym(relp)];           
358         char const *symname = &str0[w(symp->st    
359         char const *mcount = gpfx == '_' ? "_m    
360         char const *fentry = "__fentry__";        
361                                                   
362         if (symname[0] == '.')                    
363                 ++symname;  /* ppc64 hack */      
364         if (strcmp(mcount, symname) == 0 ||       
365             (altmcount && strcmp(altmcount, sy    
366             (strcmp(fentry, symname) == 0))       
367                 mcountsym = Elf_r_sym(relp);      
368                                                   
369         return mcountsym;                         
370 }                                                 
371                                                   
372 static void get_sym_str_and_relp(Elf_Shdr cons    
373                                  Elf_Ehdr cons    
374                                  Elf_Sym const    
375                                  char const **    
376                                  Elf_Rel const    
377 {                                                 
378         Elf_Shdr *const shdr0 = (Elf_Shdr *)(_    
379                 + (void *)ehdr);                  
380         unsigned const symsec_sh_link = w(relh    
381         Elf_Shdr const *const symsec = &shdr0[    
382         Elf_Shdr const *const strsec = &shdr0[    
383         Elf_Rel const *const rel0 = (Elf_Rel c    
384                 + (void *)ehdr);                  
385                                                   
386         *sym0 = (Elf_Sym const *)(_w(symsec->s    
387                                   + (void *)eh    
388                                                   
389         *str0 = (char const *)(_w(strsec->sh_o    
390                                + (void *)ehdr)    
391                                                   
392         *relp = rel0;                             
393 }                                                 
394                                                   
395 /*                                                
396  * Look at the relocations in order to find th    
397  * Accumulate the section offsets that are fou    
398  * onto the end of the existing arrays.           
399  */                                               
400 static uint_t *sift_rel_mcount(uint_t *mlocp,     
401                                unsigned const     
402                                Elf_Rel **const    
403                                Elf_Shdr const     
404                                Elf_Ehdr const     
405                                unsigned const     
406                                uint_t const re    
407                                unsigned const     
408 {                                                 
409         uint_t *const mloc0 = mlocp;              
410         Elf_Rel *mrelp = *mrelpp;                 
411         Elf_Sym const *sym0;                      
412         char const *str0;                         
413         Elf_Rel const *relp;                      
414         unsigned rel_entsize = _w(relhdr->sh_e    
415         unsigned const nrel = _w(relhdr->sh_si    
416         unsigned mcountsym = 0;                   
417         unsigned t;                               
418                                                   
419         get_sym_str_and_relp(relhdr, ehdr, &sy    
420                                                   
421         for (t = nrel; t; --t) {                  
422                 if (!mcountsym)                   
423                         mcountsym = get_mcount    
424                                                   
425                 if (mcountsym && mcountsym ==     
426                                 !is_fake_mcoun    
427                         uint_t const addend =     
428                                 _w(_w(relp->r_    
429                         mrelp->r_offset = _w(o    
430                                 + ((void *)mlo    
431                         Elf_r_info(mrelp, recs    
432                         if (rel_entsize == siz    
433                                 ((Elf_Rela *)m    
434                                 *mlocp++ = 0;     
435                         } else                    
436                                 *mlocp++ = add    
437                                                   
438                         mrelp = (Elf_Rel *)(re    
439                 }                                 
440                 relp = (Elf_Rel const *)(rel_e    
441         }                                         
442         *mrelpp = mrelp;                          
443         return mlocp;                             
444 }                                                 
445                                                   
446 /*                                                
447  * Read the relocation table again, but this t    
448  * that are not going to be traced. The mcount    
449  * into nops.                                     
450  */                                               
451 static int nop_mcount(Elf_Shdr const *const re    
452                       Elf_Ehdr const *const eh    
453                       const char *const txtnam    
454 {                                                 
455         Elf_Shdr *const shdr0 = (Elf_Shdr *)(_    
456                 + (void *)ehdr);                  
457         Elf_Sym const *sym0;                      
458         char const *str0;                         
459         Elf_Rel const *relp;                      
460         Elf_Shdr const *const shdr = &shdr0[w(    
461         unsigned rel_entsize = _w(relhdr->sh_e    
462         unsigned const nrel = _w(relhdr->sh_si    
463         unsigned mcountsym = 0;                   
464         unsigned t;                               
465         int once = 0;                             
466                                                   
467         get_sym_str_and_relp(relhdr, ehdr, &sy    
468                                                   
469         for (t = nrel; t; --t) {                  
470                 int ret = -1;                     
471                                                   
472                 if (!mcountsym)                   
473                         mcountsym = get_mcount    
474                                                   
475                 if (mcountsym == Elf_r_sym(rel    
476                         if (make_nop)             
477                                 ret = make_nop    
478                         if (warn_on_notrace_se    
479                                 printf("Sectio    
480                                        txtname    
481                                 once = 1;         
482                                 /* just warn?     
483                                 if (!make_nop)    
484                                         return    
485                         }                         
486                 }                                 
487                                                   
488                 /*                                
489                  * If we successfully removed     
490                  * as a nop (don't do anything    
491                  */                               
492                 if (!ret) {                       
493                         Elf_Rel rel;              
494                         rel = *(Elf_Rel *)relp    
495                         Elf_r_info(&rel, Elf_r    
496                         if (ulseek((void *)rel    
497                                 return -1;        
498                         if (uwrite(&rel, sizeo    
499                                 return -1;        
500                 }                                 
501                 relp = (Elf_Rel const *)(rel_e    
502         }                                         
503         return 0;                                 
504 }                                                 
505                                                   
506 /*                                                
507  * Find a symbol in the given section, to be u    
508  * the table of offsets of calls to mcount.  A    
509  * but avoid a Weak symbol because it may be o    
510  * would invalidate the relocations of the off    
511  * Often the found symbol will be the unnamed     
512  * GNU 'as' for the start of each section.  Fo    
513  *    Num:    Value  Size Type    Bind   Vis      
514  *      2: 00000000     0 SECTION LOCAL  DEFAU    
515  */                                               
516 static int find_secsym_ndx(unsigned const txtn    
517                                 char const *co    
518                                 uint_t *const     
519                                 unsigned int *    
520                                 Elf_Shdr const    
521                                 Elf32_Word con    
522                                 Elf32_Word con    
523                                 Elf_Ehdr const    
524 {                                                 
525         Elf_Sym const *const sym0 = (Elf_Sym c    
526                 + (void *)ehdr);                  
527         unsigned const nsym = _w(symhdr->sh_si    
528         Elf_Sym const *symp;                      
529         unsigned t;                               
530                                                   
531         for (symp = sym0, t = nsym; t; --t, ++    
532                 unsigned int const st_bind = E    
533                                                   
534                 if (txtndx == get_symindex(sym    
535                         /* avoid STB_WEAK */      
536                     && (STB_LOCAL == st_bind |    
537                         /* function symbols on    
538                         if (w2(ehdr->e_machine    
539                             && ELF_ST_TYPE(sym    
540                                 continue;         
541                                                   
542                         *recvalp = _w(symp->st    
543                         *sym_index = symp - sy    
544                         return 0;                 
545                 }                                 
546         }                                         
547         fprintf(stderr, "Cannot find symbol fo    
548                 txtndx, txtname);                 
549         return -1;                                
550 }                                                 
551                                                   
552 /* Evade ISO C restriction: no declaration aft    
553 static char const * __has_rel_mcount(Elf_Shdr     
554                                      Elf_Shdr     
555                                      char cons    
556                                      char cons    
557 {                                                 
558         /* .sh_info depends on .sh_type == SHT    
559         Elf_Shdr const *const txthdr = &shdr0[    
560         char const *const txtname = &shstrtab[    
561                                                   
562         if (strcmp("__mcount_loc", txtname) ==    
563                 fprintf(stderr, "warning: __mc    
564                         fname);                   
565                 return already_has_rel_mcount;    
566         }                                         
567         if (w(txthdr->sh_type) != SHT_PROGBITS    
568             !(_w(txthdr->sh_flags) & SHF_EXECI    
569                 return NULL;                      
570         return txtname;                           
571 }                                                 
572                                                   
573 static char const *has_rel_mcount(Elf_Shdr con    
574                                   Elf_Shdr con    
575                                   char const *    
576                                   char const *    
577 {                                                 
578         if (w(relhdr->sh_type) != SHT_REL && w    
579                 return NULL;                      
580         return __has_rel_mcount(relhdr, shdr0,    
581 }                                                 
582                                                   
583                                                   
584 static unsigned tot_relsize(Elf_Shdr const *co    
585                             unsigned nhdr,        
586                             const char *const     
587                             const char *const     
588 {                                                 
589         unsigned totrelsz = 0;                    
590         Elf_Shdr const *shdrp = shdr0;            
591         char const *txtname;                      
592                                                   
593         for (; nhdr; --nhdr, ++shdrp) {           
594                 txtname = has_rel_mcount(shdrp    
595                 if (txtname == already_has_rel    
596                         totrelsz = 0;             
597                         break;                    
598                 }                                 
599                 if (txtname && is_mcounted_sec    
600                         totrelsz += _w(shdrp->    
601         }                                         
602         return totrelsz;                          
603 }                                                 
604                                                   
605 /* Overall supervision for Elf32 ET_REL file.     
606 static int do_func(Elf_Ehdr *const ehdr, char     
607                    unsigned const reltype)        
608 {                                                 
609         Elf_Shdr *const shdr0 = (Elf_Shdr *)(_    
610                 + (void *)ehdr);                  
611         unsigned const nhdr = get_shnum(ehdr,     
612         Elf_Shdr *const shstr = &shdr0[get_shs    
613         char const *const shstrtab = (char con    
614                 + (void *)ehdr);                  
615                                                   
616         Elf_Shdr const *relhdr;                   
617         unsigned k;                               
618                                                   
619         Elf32_Word *symtab;                       
620         Elf32_Word *symtab_shndx;                 
621                                                   
622         /* Upper bound on space: assume all re    
623         unsigned       totrelsz;                  
624                                                   
625         Elf_Rel *      mrel0;                     
626         Elf_Rel *      mrelp;                     
627                                                   
628         uint_t *      mloc0;                      
629         uint_t *      mlocp;                      
630                                                   
631         unsigned rel_entsize = 0;                 
632         unsigned symsec_sh_link = 0;              
633                                                   
634         int result = 0;                           
635                                                   
636         totrelsz = tot_relsize(shdr0, nhdr, sh    
637         if (totrelsz == 0)                        
638                 return 0;                         
639         mrel0 = umalloc(totrelsz);                
640         mrelp = mrel0;                            
641         if (!mrel0)                               
642                 return -1;                        
643                                                   
644         /* 2*sizeof(address) <= sizeof(Elf_Rel    
645         mloc0 = umalloc(totrelsz>>1);             
646         mlocp = mloc0;                            
647         if (!mloc0) {                             
648                 free(mrel0);                      
649                 return -1;                        
650         }                                         
651                                                   
652         find_symtab(ehdr, shdr0, nhdr, &symtab    
653                                                   
654         for (relhdr = shdr0, k = nhdr; k; --k,    
655                 char const *const txtname = ha    
656                         shstrtab, fname);         
657                 if (txtname == already_has_rel    
658                         result = 0;               
659                         file_updated = 0;         
660                         goto out; /* Nothing t    
661                 }                                 
662                 if (txtname && is_mcounted_sec    
663                         unsigned int recsym;      
664                         uint_t recval = 0;        
665                                                   
666                         symsec_sh_link = w(rel    
667                         result = find_secsym_n    
668                                                   
669                                                   
670                                                   
671                                                   
672                         if (result)               
673                                 goto out;         
674                                                   
675                         rel_entsize = _w(relhd    
676                         mlocp = sift_rel_mcoun    
677                                 (void *)mlocp     
678                                 relhdr, ehdr,     
679                 } else if (txtname && (warn_on    
680                         /*                        
681                          * This section is ign    
682                          * has mcount calls. C    
683                          */                       
684                         if (nop_mcount(relhdr,    
685                                 result = -1;      
686                                 goto out;         
687                         }                         
688                 }                                 
689         }                                         
690         if (!result && mloc0 != mlocp)            
691                 result = append_func(ehdr, shs    
692                                      rel_entsi    
693 out:                                              
694         free(mrel0);                              
695         free(mloc0);                              
696         return result;                            
697 }                                                 
698                                                   

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