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Linux/arch/powerpc/boot/addnote.c

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  1 /*
  2  * Program to hack in a PT_NOTE program header entry in an ELF file.
  3  * This is needed for OF on RS/6000s to load an image correctly.
  4  * Note that OF needs a program header entry for the note, not an
  5  * ELF section.
  6  *
  7  * Copyright 2000 Paul Mackerras.
  8  *
  9  * This program is free software; you can redistribute it and/or
 10  * modify it under the terms of the GNU General Public License
 11  * as published by the Free Software Foundation; either version
 12  * 2 of the License, or (at your option) any later version.
 13  *
 14  * Usage: addnote zImage
 15  */
 16 #include <stdio.h>
 17 #include <stdlib.h>
 18 #include <fcntl.h>
 19 #include <unistd.h>
 20 #include <string.h>
 21 
 22 /* CHRP note section */
 23 static const char arch[] = "PowerPC";
 24 
 25 #define N_DESCR 6
 26 unsigned int descr[N_DESCR] = {
 27         0xffffffff,             /* real-mode = true */
 28         0x02000000,             /* real-base, i.e. where we expect OF to be */
 29         0xffffffff,             /* real-size */
 30         0xffffffff,             /* virt-base */
 31         0xffffffff,             /* virt-size */
 32         0x4000,                 /* load-base */
 33 };
 34 
 35 /* RPA note section */
 36 static const char rpaname[] = "IBM,RPA-Client-Config";
 37 
 38 /*
 39  * Note: setting ignore_my_client_config *should* mean that OF ignores
 40  * all the other fields, but there is a firmware bug which means that
 41  * it looks at the splpar field at least.  So these values need to be
 42  * reasonable.
 43  */
 44 #define N_RPA_DESCR     8
 45 unsigned int rpanote[N_RPA_DESCR] = {
 46         0,                      /* lparaffinity */
 47         64,                     /* min_rmo_size */
 48         0,                      /* min_rmo_percent */
 49         40,                     /* max_pft_size */
 50         1,                      /* splpar */
 51         -1,                     /* min_load */
 52         0,                      /* new_mem_def */
 53         1,                      /* ignore_my_client_config */
 54 };
 55 
 56 #define ROUNDUP(len)    (((len) + 3) & ~3)
 57 
 58 unsigned char buf[512];
 59 
 60 #define GET_16BE(off)   ((buf[off] << 8) + (buf[(off)+1]))
 61 #define GET_32BE(off)   ((GET_16BE(off) << 16) + GET_16BE((off)+2))
 62 
 63 #define PUT_16BE(off, v)        (buf[off] = ((v) >> 8) & 0xff, \
 64                                  buf[(off) + 1] = (v) & 0xff)
 65 #define PUT_32BE(off, v)        (PUT_16BE((off), (v) >> 16), \
 66                                  PUT_16BE((off) + 2, (v)))
 67 
 68 /* Structure of an ELF file */
 69 #define E_IDENT         0       /* ELF header */
 70 #define E_PHOFF         28
 71 #define E_PHENTSIZE     42
 72 #define E_PHNUM         44
 73 #define E_HSIZE         52      /* size of ELF header */
 74 
 75 #define EI_MAGIC        0       /* offsets in E_IDENT area */
 76 #define EI_CLASS        4
 77 #define EI_DATA         5
 78 
 79 #define PH_TYPE         0       /* ELF program header */
 80 #define PH_OFFSET       4
 81 #define PH_FILESZ       16
 82 #define PH_HSIZE        32      /* size of program header */
 83 
 84 #define PT_NOTE         4       /* Program header type = note */
 85 
 86 #define ELFCLASS32      1
 87 #define ELFDATA2MSB     2
 88 
 89 unsigned char elf_magic[4] = { 0x7f, 'E', 'L', 'F' };
 90 
 91 int
 92 main(int ac, char **av)
 93 {
 94         int fd, n, i;
 95         int ph, ps, np;
 96         int nnote, nnote2, ns;
 97 
 98         if (ac != 2) {
 99                 fprintf(stderr, "Usage: %s elf-file\n", av[0]);
100                 exit(1);
101         }
102         fd = open(av[1], O_RDWR);
103         if (fd < 0) {
104                 perror(av[1]);
105                 exit(1);
106         }
107 
108         nnote = 12 + ROUNDUP(strlen(arch) + 1) + sizeof(descr);
109         nnote2 = 12 + ROUNDUP(strlen(rpaname) + 1) + sizeof(rpanote);
110 
111         n = read(fd, buf, sizeof(buf));
112         if (n < 0) {
113                 perror("read");
114                 exit(1);
115         }
116 
117         if (n < E_HSIZE || memcmp(&buf[E_IDENT+EI_MAGIC], elf_magic, 4) != 0)
118                 goto notelf;
119 
120         if (buf[E_IDENT+EI_CLASS] != ELFCLASS32
121             || buf[E_IDENT+EI_DATA] != ELFDATA2MSB) {
122                 fprintf(stderr, "%s is not a big-endian 32-bit ELF image\n",
123                         av[1]);
124                 exit(1);
125         }
126 
127         ph = GET_32BE(E_PHOFF);
128         ps = GET_16BE(E_PHENTSIZE);
129         np = GET_16BE(E_PHNUM);
130         if (ph < E_HSIZE || ps < PH_HSIZE || np < 1)
131                 goto notelf;
132         if (ph + (np + 2) * ps + nnote + nnote2 > n)
133                 goto nospace;
134 
135         for (i = 0; i < np; ++i) {
136                 if (GET_32BE(ph + PH_TYPE) == PT_NOTE) {
137                         fprintf(stderr, "%s already has a note entry\n",
138                                 av[1]);
139                         exit(0);
140                 }
141                 ph += ps;
142         }
143 
144         /* XXX check that the area we want to use is all zeroes */
145         for (i = 0; i < 2 * ps + nnote + nnote2; ++i)
146                 if (buf[ph + i] != 0)
147                         goto nospace;
148 
149         /* fill in the program header entry */
150         ns = ph + 2 * ps;
151         PUT_32BE(ph + PH_TYPE, PT_NOTE);
152         PUT_32BE(ph + PH_OFFSET, ns);
153         PUT_32BE(ph + PH_FILESZ, nnote);
154 
155         /* fill in the note area we point to */
156         /* XXX we should probably make this a proper section */
157         PUT_32BE(ns, strlen(arch) + 1);
158         PUT_32BE(ns + 4, N_DESCR * 4);
159         PUT_32BE(ns + 8, 0x1275);
160         strcpy((char *) &buf[ns + 12], arch);
161         ns += 12 + strlen(arch) + 1;
162         for (i = 0; i < N_DESCR; ++i, ns += 4)
163                 PUT_32BE(ns, descr[i]);
164 
165         /* fill in the second program header entry and the RPA note area */
166         ph += ps;
167         PUT_32BE(ph + PH_TYPE, PT_NOTE);
168         PUT_32BE(ph + PH_OFFSET, ns);
169         PUT_32BE(ph + PH_FILESZ, nnote2);
170 
171         /* fill in the note area we point to */
172         PUT_32BE(ns, strlen(rpaname) + 1);
173         PUT_32BE(ns + 4, sizeof(rpanote));
174         PUT_32BE(ns + 8, 0x12759999);
175         strcpy((char *) &buf[ns + 12], rpaname);
176         ns += 12 + ROUNDUP(strlen(rpaname) + 1);
177         for (i = 0; i < N_RPA_DESCR; ++i, ns += 4)
178                 PUT_32BE(ns, rpanote[i]);
179 
180         /* Update the number of program headers */
181         PUT_16BE(E_PHNUM, np + 2);
182 
183         /* write back */
184         lseek(fd, (long) 0, SEEK_SET);
185         i = write(fd, buf, n);
186         if (i < 0) {
187                 perror("write");
188                 exit(1);
189         }
190         if (i < n) {
191                 fprintf(stderr, "%s: write truncated\n", av[1]);
192                 exit(1);
193         }
194 
195         exit(0);
196 
197  notelf:
198         fprintf(stderr, "%s does not appear to be an ELF file\n", av[1]);
199         exit(1);
200 
201  nospace:
202         fprintf(stderr, "sorry, I can't find space in %s to put the note\n",
203                 av[1]);
204         exit(1);
205 }
206 

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