Commit | Line | Data |
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1136f72d | 1 | /* |
27b6ced7 | 2 | * $Id: md.c,v 1.3 1993/11/22 19:05:30 jkh Exp $ |
1136f72d PR |
3 | */ |
4 | ||
5 | #include <sys/param.h> | |
6 | #include <stdio.h> | |
7 | #include <stdlib.h> | |
8 | #include <sys/types.h> | |
9 | #include <fcntl.h> | |
10 | #include <a.out.h> | |
11 | #include <stab.h> | |
12 | #include <string.h> | |
13 | ||
14 | #include "ld.h" | |
15 | ||
16 | /* | |
17 | * Relocation masks and sizes for the Sparc architecture. | |
18 | * | |
19 | * Note that these are very dependent on the order of the enums in | |
20 | * enum reloc_type (in a.out.h); if they change the following must be | |
21 | * changed. | |
22 | * Also, note that RELOC_RELATIVE is handled as if it were a RELOC_HI22. | |
23 | * This should work provided that relocations values have zeroes in their | |
24 | * least significant 10 bits. As RELOC_RELATIVE is used only to relocate | |
25 | * with load address values - which are page aligned - this condition is | |
26 | * fulfilled as long as the system's page size is > 1024 (and a power of 2). | |
27 | */ | |
28 | static int reloc_target_rightshift[] = { | |
29 | 0, 0, 0, /* RELOC_8, _16, _32 */ | |
30 | 0, 0, 0, 2, 2, /* DISP8, DISP16, DISP32, WDISP30, WDISP22 */ | |
31 | 10, 0, /* HI22, _22 */ | |
32 | 0, 0, /* RELOC_13, _LO10 */ | |
33 | 0, 0, /* _SFA_BASE, _SFA_OFF13 */ | |
34 | 0, 0, 10, /* _BASE10, _BASE13, _BASE22 */ | |
35 | 0, 10, /* _PC10, _PC22 */ | |
36 | 2, 0, /* _JMP_TBL, _SEGOFF16 */ | |
37 | 0, 0, 0 /* _GLOB_DAT, JMP_SLOT, _RELATIVE */ | |
38 | }; | |
39 | static int reloc_target_size[] = { | |
40 | 0, 1, 2, /* RELOC_8, _16, _32 */ | |
41 | 0, 1, 2, 2, 2, /* DISP8, DISP16, DISP32, WDISP30, WDISP22 */ | |
42 | 2, 2, /* HI22, _22 */ | |
43 | 2, 2, /* RELOC_13, _LO10 */ | |
44 | 2, 2, /* _SFA_BASE, _SFA_OFF13 */ | |
45 | 2, 2, 2, /* _BASE10, _BASE13, _BASE22 */ | |
46 | 2, 2, /* _PC10, _PC22 */ | |
47 | 2, 0, /* _JMP_TBL, _SEGOFF16 */ | |
48 | 2, 0, 2 /* _GLOB_DAT, JMP_SLOT, _RELATIVE */ | |
49 | }; | |
50 | static int reloc_target_bitsize[] = { | |
51 | 8, 16, 32, /* RELOC_8, _16, _32 */ | |
52 | 8, 16, 32, 30, 22, /* DISP8, DISP16, DISP32, WDISP30, WDISP22 */ | |
53 | 22, 22, /* HI22, _22 */ | |
54 | 13, 10, /* RELOC_13, _LO10 */ | |
55 | 32, 32, /* _SFA_BASE, _SFA_OFF13 */ | |
56 | 10, 13, 22, /* _BASE10, _BASE13, _BASE22 */ | |
57 | 10, 22, /* _PC10, _PC22 */ | |
58 | 30, 0, /* _JMP_TBL, _SEGOFF16 */ | |
59 | 32, 0, 22 /* _GLOB_DAT, JMP_SLOT, _RELATIVE */ | |
60 | }; | |
61 | ||
62 | ||
63 | /* | |
64 | * Get relocation addend corresponding to relocation record RP | |
65 | * ADDR unused by SPARC impl. | |
66 | */ | |
67 | long | |
68 | md_get_addend(r, addr) | |
69 | struct relocation_info *r; | |
70 | unsigned char *addr; | |
71 | { | |
72 | return r->r_addend; | |
73 | } | |
74 | ||
75 | void | |
76 | md_relocate(r, relocation, addr, relocatable_output) | |
77 | struct relocation_info *r; | |
78 | long relocation; | |
79 | unsigned char *addr; | |
80 | int relocatable_output; | |
81 | { | |
82 | register unsigned long mask; | |
83 | ||
84 | if (relocatable_output) { | |
85 | /* | |
86 | * Non-PC relative relocations which are absolute or | |
87 | * which have become non-external now have fixed | |
88 | * relocations. Set the ADD_EXTRA of this relocation | |
89 | * to be the relocation we have now determined. | |
90 | */ | |
91 | if (!RELOC_PCREL_P(r)) { | |
92 | if ((int) r->r_type <= RELOC_32 | |
93 | || RELOC_EXTERN_P(r) == 0) | |
94 | RELOC_ADD_EXTRA(r) = relocation; | |
95 | } else if (RELOC_EXTERN_P(r)) | |
96 | /* | |
97 | * External PC-relative relocations continue | |
98 | * to move around; update their relocations | |
99 | * by the amount they have moved so far. | |
100 | */ | |
101 | RELOC_ADD_EXTRA(r) -= pc_relocation; | |
102 | return; | |
103 | } | |
104 | ||
105 | relocation >>= RELOC_VALUE_RIGHTSHIFT(r); | |
106 | ||
107 | /* Unshifted mask for relocation */ | |
108 | mask = 1 << RELOC_TARGET_BITSIZE(r) - 1; | |
109 | mask |= mask - 1; | |
110 | relocation &= mask; | |
111 | ||
112 | /* Shift everything up to where it's going to be used */ | |
113 | relocation <<= RELOC_TARGET_BITPOS(r); | |
114 | mask <<= RELOC_TARGET_BITPOS(r); | |
115 | ||
116 | switch (RELOC_TARGET_SIZE(r)) { | |
117 | case 0: | |
118 | if (RELOC_MEMORY_ADD_P(r)) | |
119 | relocation += (mask & *(u_char *) (addr)); | |
120 | *(u_char *) (addr) &= ~mask; | |
121 | *(u_char *) (addr) |= relocation; | |
122 | break; | |
123 | ||
124 | case 1: | |
125 | if (RELOC_MEMORY_ADD_P(r)) | |
126 | relocation += (mask & *(u_short *) (addr)); | |
127 | *(u_short *) (addr) &= ~mask; | |
128 | *(u_short *) (addr) |= relocation; | |
129 | break; | |
130 | ||
131 | case 2: | |
132 | if (RELOC_MEMORY_ADD_P(r)) | |
133 | relocation += (mask & *(u_long *) (addr)); | |
134 | *(u_long *) (addr) &= ~mask; | |
135 | *(u_long *) (addr) |= relocation; | |
136 | break; | |
137 | default: | |
138 | fatal( "Unimplemented relocation field length in"); | |
139 | } | |
140 | } | |
141 | ||
142 | /* | |
143 | * Initialize (output) exec header such that useful values are | |
144 | * obtained from subsequent N_*() macro evaluations. | |
145 | */ | |
146 | void | |
147 | md_init_header(hp, magic, flags) | |
148 | struct exec *hp; | |
149 | int magic, flags; | |
150 | { | |
7fc7155d PR |
151 | #ifdef NetBSD |
152 | N_SETMAGIC((*hp), magic, MID_MACHINE, flags); | |
153 | ||
154 | /* TEXT_START depends on the value of outheader.a_entry. */ | |
155 | if (!(link_mode & SHAREABLE)) /*WAS: if (entry_symbol) */ | |
156 | hp->a_entry = PAGSIZ; | |
157 | #else | |
1136f72d PR |
158 | hp->a_magic = magic; |
159 | hp->a_machtype = M_SPARC; | |
160 | hp->a_toolversion = 1; | |
161 | hp->a_dynamic = ((flags) & EX_DYNAMIC); | |
162 | ||
163 | /* SunOS 4.1 N_TXTADDR depends on the value of outheader.a_entry. */ | |
164 | if (!(link_mode & SHAREABLE)) /*WAS: if (entry_symbol) */ | |
165 | hp->a_entry = N_PAGSIZ(*hp); | |
7fc7155d | 166 | #endif |
1136f72d PR |
167 | } |
168 | ||
169 | /* | |
170 | * Machine dependent part of claim_rrs_reloc(). | |
171 | * On the Sparc the relocation offsets are stored in the r_addend member. | |
172 | */ | |
173 | int | |
174 | md_make_reloc(rp, r, type) | |
175 | struct relocation_info *rp, *r; | |
176 | int type; | |
177 | { | |
178 | r->r_type = rp->r_type; | |
179 | r->r_addend = rp->r_addend; | |
180 | ||
181 | #if 1 | |
182 | /* | |
183 | * This wouldn't be strictly necessary - we could record the | |
184 | * location value "in situ" in stead of in the r_addend field - | |
185 | * but we are being Sun compatible here. Besides, Sun's ld.so | |
186 | * has a bug that prevents it from handling this alternate method | |
187 | */ | |
188 | if (RELOC_PCREL_P(rp)) | |
189 | r->r_addend -= pc_relocation; | |
190 | #endif | |
191 | ||
192 | return 1; | |
193 | } | |
194 | ||
195 | /* | |
196 | * Set up a transfer from jmpslot at OFFSET (relative to the PLT table) | |
197 | * to the binder slot (which is at offset 0 of the PLT). | |
198 | */ | |
199 | void | |
200 | md_make_jmpslot(sp, offset, index) | |
201 | jmpslot_t *sp; | |
202 | long offset; | |
203 | long index; | |
204 | { | |
205 | u_long fudge = (u_long) -(sizeof(sp->opcode1) + offset); | |
206 | sp->opcode1 = SAVE; | |
207 | /* The following is a RELOC_WDISP30 relocation */ | |
208 | sp->opcode2 = CALL | ((fudge >> 2) & 0x3fffffff); | |
209 | sp->reloc_index = NOP | index; | |
210 | } | |
211 | ||
212 | /* | |
213 | * Set up a "direct" transfer (ie. not through the run-time binder) from | |
214 | * jmpslot at OFFSET to ADDR. Used by `ld' when the SYMBOLIC flag is on, | |
215 | * and by `ld.so' after resolving the symbol. | |
216 | * On the i386, we use the JMP instruction which is PC relative, so no | |
217 | * further RRS relocations will be necessary for such a jmpslot. | |
218 | * | |
219 | * OFFSET unused on Sparc. | |
220 | */ | |
221 | void | |
222 | md_fix_jmpslot(sp, offset, addr) | |
223 | jmpslot_t *sp; | |
224 | long offset; | |
225 | u_long addr; | |
226 | { | |
227 | /* | |
228 | * Here comes a RELOC_{LO10,HI22} relocation pair | |
229 | * The resulting code is: | |
230 | * sethi %hi(addr), %g1 | |
231 | * jmp %g1+%lo(addr) | |
232 | * nop ! delay slot | |
233 | */ | |
234 | sp->opcode1 = SETHI | ((addr >> 10) & 0x003fffff); | |
235 | sp->opcode2 = JMP | (addr & 0x000003ff); | |
236 | sp->reloc_index = NOP; | |
237 | } | |
238 | ||
239 | /* | |
240 | * Update the relocation record for a jmpslot. | |
241 | */ | |
242 | void | |
243 | md_make_jmpreloc(rp, r, type) | |
244 | struct relocation_info *rp, *r; | |
245 | int type; | |
246 | { | |
247 | if (type & RELTYPE_RELATIVE) | |
248 | r->r_type = RELOC_RELATIVE; | |
249 | else | |
250 | r->r_type = RELOC_JMP_SLOT; | |
251 | ||
252 | r->r_addend = rp->r_addend; | |
253 | } | |
254 | ||
255 | /* | |
256 | * Set relocation type for a GOT RRS relocation. | |
257 | */ | |
258 | void | |
259 | md_make_gotreloc(rp, r, type) | |
260 | struct relocation_info *rp, *r; | |
261 | int type; | |
262 | { | |
263 | /* | |
264 | * GOT value resolved (symbolic or entry point): R_32 | |
265 | * GOT not resolved: GLOB_DAT | |
266 | * | |
267 | * NOTE: I don't think it makes a difference. | |
268 | */ | |
269 | if (type & RELTYPE_RELATIVE) | |
270 | r->r_type = RELOC_32; | |
271 | else | |
272 | r->r_type = RELOC_GLOB_DAT; | |
273 | ||
274 | r->r_addend = 0; | |
275 | } | |
276 | ||
277 | /* | |
278 | * Set relocation type for a RRS copy operation. | |
279 | */ | |
280 | void | |
281 | md_make_cpyreloc(rp, r) | |
282 | struct relocation_info *rp, *r; | |
283 | { | |
284 | r->r_type = RELOC_COPY_DAT; | |
285 | r->r_addend = 0; | |
286 | } | |
287 | ||
80f25b52 JH |
288 | void |
289 | md_set_breakpoint(where, savep) | |
290 | long where; | |
291 | long *savep; | |
292 | { | |
293 | *savep = *(long *)where; | |
27b6ced7 | 294 | *(long *)where = TRAP; |
80f25b52 JH |
295 | } |
296 |