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Commit | Line | Data |
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0910d0bc | 1 | #include <common.h> |
27b207fd | 2 | #include <exports.h> |
2d5db193 | 3 | #include <linux/compiler.h> |
93f6a677 | 4 | |
49cad547 MD |
5 | #define FO(x) offsetof(struct jt_funcs, x) |
6 | ||
fea25720 | 7 | #if defined(CONFIG_X86) |
27b207fd WD |
8 | /* |
9 | * x86 does not have a dedicated register to store the pointer to | |
10 | * the global_data. Thus the jump table address is stored in a | |
11 | * global variable, but such approach does not allow for execution | |
12 | * from flash memory. The global_data address is passed as argv[-1] | |
13 | * to the application program. | |
14 | */ | |
49cad547 | 15 | static struct jt_funcs *jt; |
77846748 | 16 | gd_t *global_data; |
27b207fd | 17 | |
49cad547 | 18 | #define EXPORT_FUNC(f, a, x, ...) \ |
27b207fd WD |
19 | asm volatile ( \ |
20 | " .globl " #x "\n" \ | |
21 | #x ":\n" \ | |
22 | " movl %0, %%eax\n" \ | |
23 | " movl jt, %%ecx\n" \ | |
24 | " jmp *(%%ecx, %%eax)\n" \ | |
49cad547 | 25 | : : "i"(FO(x)) : "eax", "ecx"); |
27b207fd WD |
26 | #elif defined(CONFIG_PPC) |
27 | /* | |
e7670f6c | 28 | * r2 holds the pointer to the global_data, r11 is a call-clobbered |
27b207fd WD |
29 | * register |
30 | */ | |
49cad547 | 31 | #define EXPORT_FUNC(f, a, x, ...) \ |
27b207fd WD |
32 | asm volatile ( \ |
33 | " .globl " #x "\n" \ | |
34 | #x ":\n" \ | |
e7670f6c | 35 | " lwz %%r11, %0(%%r2)\n" \ |
27b207fd WD |
36 | " lwz %%r11, %1(%%r11)\n" \ |
37 | " mtctr %%r11\n" \ | |
38 | " bctr\n" \ | |
49cad547 | 39 | : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r11"); |
27b207fd | 40 | #elif defined(CONFIG_ARM) |
0ae76531 DF |
41 | #ifdef CONFIG_ARM64 |
42 | /* | |
43 | * x18 holds the pointer to the global_data, x9 is a call-clobbered | |
44 | * register | |
45 | */ | |
49cad547 | 46 | #define EXPORT_FUNC(f, a, x, ...) \ |
0ae76531 DF |
47 | asm volatile ( \ |
48 | " .globl " #x "\n" \ | |
49 | #x ":\n" \ | |
50 | " ldr x9, [x18, %0]\n" \ | |
51 | " ldr x9, [x9, %1]\n" \ | |
52 | " br x9\n" \ | |
49cad547 | 53 | : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "x9"); |
0ae76531 | 54 | #else |
27b207fd | 55 | /* |
a5a42eec | 56 | * r9 holds the pointer to the global_data, ip is a call-clobbered |
27b207fd WD |
57 | * register |
58 | */ | |
49cad547 | 59 | #define EXPORT_FUNC(f, a, x, ...) \ |
27b207fd WD |
60 | asm volatile ( \ |
61 | " .globl " #x "\n" \ | |
62 | #x ":\n" \ | |
a5a42eec | 63 | " ldr ip, [r9, %0]\n" \ |
27b207fd | 64 | " ldr pc, [ip, %1]\n" \ |
49cad547 | 65 | : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "ip"); |
0ae76531 | 66 | #endif |
27b207fd | 67 | #elif defined(CONFIG_MIPS) |
4a48cfc4 SG |
68 | #ifdef CONFIG_CPU_MIPS64 |
69 | /* | |
70 | * k0 ($26) holds the pointer to the global_data; t9 ($25) is a call- | |
71 | * clobbered register that is also used to set gp ($26). Note that the | |
72 | * jr instruction also executes the instruction immediately following | |
73 | * it; however, GCC/mips generates an additional `nop' after each asm | |
74 | * statement | |
75 | */ | |
76 | #define EXPORT_FUNC(f, a, x, ...) \ | |
77 | asm volatile ( \ | |
78 | " .globl " #x "\n" \ | |
79 | #x ":\n" \ | |
80 | " ld $25, %0($26)\n" \ | |
81 | " ld $25, %1($25)\n" \ | |
82 | " jr $25\n" \ | |
83 | : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "t9"); | |
84 | #else | |
27b207fd WD |
85 | /* |
86 | * k0 ($26) holds the pointer to the global_data; t9 ($25) is a call- | |
87 | * clobbered register that is also used to set gp ($26). Note that the | |
88 | * jr instruction also executes the instruction immediately following | |
89 | * it; however, GCC/mips generates an additional `nop' after each asm | |
90 | * statement | |
91 | */ | |
49cad547 | 92 | #define EXPORT_FUNC(f, a, x, ...) \ |
27b207fd WD |
93 | asm volatile ( \ |
94 | " .globl " #x "\n" \ | |
95 | #x ":\n" \ | |
96 | " lw $25, %0($26)\n" \ | |
97 | " lw $25, %1($25)\n" \ | |
98 | " jr $25\n" \ | |
49cad547 | 99 | : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "t9"); |
4a48cfc4 | 100 | #endif |
5c952cf0 WD |
101 | #elif defined(CONFIG_NIOS2) |
102 | /* | |
0df01fd3 | 103 | * gp holds the pointer to the global_data, r8 is call-clobbered |
5c952cf0 | 104 | */ |
49cad547 | 105 | #define EXPORT_FUNC(f, a, x, ...) \ |
5c952cf0 WD |
106 | asm volatile ( \ |
107 | " .globl " #x "\n" \ | |
108 | #x ":\n" \ | |
109 | " movhi r8, %%hi(%0)\n" \ | |
110 | " ori r8, r0, %%lo(%0)\n" \ | |
0df01fd3 | 111 | " add r8, r8, gp\n" \ |
5c952cf0 WD |
112 | " ldw r8, 0(r8)\n" \ |
113 | " ldw r8, %1(r8)\n" \ | |
114 | " jmp r8\n" \ | |
49cad547 | 115 | : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "gp"); |
bf9e3b38 WD |
116 | #elif defined(CONFIG_M68K) |
117 | /* | |
118 | * d7 holds the pointer to the global_data, a0 is a call-clobbered | |
119 | * register | |
120 | */ | |
49cad547 | 121 | #define EXPORT_FUNC(f, a, x, ...) \ |
bf9e3b38 WD |
122 | asm volatile ( \ |
123 | " .globl " #x "\n" \ | |
124 | #x ":\n" \ | |
125 | " move.l %%d7, %%a0\n" \ | |
126 | " adda.l %0, %%a0\n" \ | |
127 | " move.l (%%a0), %%a0\n" \ | |
128 | " adda.l %1, %%a0\n" \ | |
129 | " move.l (%%a0), %%a0\n" \ | |
130 | " jmp (%%a0)\n" \ | |
49cad547 | 131 | : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "a0"); |
857cad37 | 132 | #elif defined(CONFIG_MICROBLAZE) |
507bbe3e WD |
133 | /* |
134 | * r31 holds the pointer to the global_data. r5 is a call-clobbered. | |
135 | */ | |
49cad547 | 136 | #define EXPORT_FUNC(f, a, x, ...) \ |
507bbe3e WD |
137 | asm volatile ( \ |
138 | " .globl " #x "\n" \ | |
139 | #x ":\n" \ | |
140 | " lwi r5, r31, %0\n" \ | |
141 | " lwi r5, r5, %1\n" \ | |
142 | " bra r5\n" \ | |
49cad547 | 143 | : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r5"); |
0afe519a WD |
144 | #elif defined(CONFIG_BLACKFIN) |
145 | /* | |
c4db335c | 146 | * P3 holds the pointer to the global_data, P0 is a call-clobbered |
0afe519a WD |
147 | * register |
148 | */ | |
49cad547 | 149 | #define EXPORT_FUNC(f, a, x, ...) \ |
8e7b703a | 150 | asm volatile ( \ |
61fb15c5 | 151 | " .globl _" #x "\n_" \ |
0afe519a | 152 | #x ":\n" \ |
c4db335c | 153 | " P0 = [P3 + %0]\n" \ |
0afe519a WD |
154 | " P0 = [P0 + %1]\n" \ |
155 | " JUMP (P0)\n" \ | |
49cad547 | 156 | : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "P0"); |
7b64fef3 WD |
157 | #elif defined(CONFIG_AVR32) |
158 | /* | |
159 | * r6 holds the pointer to the global_data. r8 is call clobbered. | |
160 | */ | |
49cad547 | 161 | #define EXPORT_FUNC(f, a, x, ...) \ |
7b64fef3 WD |
162 | asm volatile( \ |
163 | " .globl\t" #x "\n" \ | |
164 | #x ":\n" \ | |
165 | " ld.w r8, r6[%0]\n" \ | |
166 | " ld.w pc, r8[%1]\n" \ | |
167 | : \ | |
49cad547 | 168 | : "i"(offsetof(gd_t, jt)), "i"(FO(x)) \ |
7b64fef3 | 169 | : "r8"); |
0b135cfc NI |
170 | #elif defined(CONFIG_SH) |
171 | /* | |
172 | * r13 holds the pointer to the global_data. r1 is a call clobbered. | |
173 | */ | |
49cad547 | 174 | #define EXPORT_FUNC(f, a, x, ...) \ |
61fb15c5 WD |
175 | asm volatile ( \ |
176 | " .align 2\n" \ | |
177 | " .globl " #x "\n" \ | |
178 | #x ":\n" \ | |
179 | " mov r13, r1\n" \ | |
180 | " add %0, r1\n" \ | |
cae6f909 NI |
181 | " mov.l @r1, r2\n" \ |
182 | " add %1, r2\n" \ | |
183 | " mov.l @r2, r1\n" \ | |
61fb15c5 WD |
184 | " jmp @r1\n" \ |
185 | " nop\n" \ | |
186 | " nop\n" \ | |
49cad547 | 187 | : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r1", "r2"); |
c2f02da2 DH |
188 | #elif defined(CONFIG_SPARC) |
189 | /* | |
190 | * g7 holds the pointer to the global_data. g1 is call clobbered. | |
191 | */ | |
49cad547 | 192 | #define EXPORT_FUNC(f, a, x, ...) \ |
c2f02da2 DH |
193 | asm volatile( \ |
194 | " .globl\t" #x "\n" \ | |
195 | #x ":\n" \ | |
196 | " set %0, %%g1\n" \ | |
197 | " or %%g1, %%g7, %%g1\n" \ | |
198 | " ld [%%g1], %%g1\n" \ | |
199 | " ld [%%g1 + %1], %%g1\n" \ | |
2c0c58b9 | 200 | " jmp %%g1\n" \ |
c2f02da2 | 201 | " nop\n" \ |
49cad547 | 202 | : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "g1"); |
72c73dde ML |
203 | #elif defined(CONFIG_NDS32) |
204 | /* | |
205 | * r16 holds the pointer to the global_data. gp is call clobbered. | |
206 | * not support reduced register (16 GPR). | |
207 | */ | |
49cad547 | 208 | #define EXPORT_FUNC(f, a, x, ...) \ |
72c73dde ML |
209 | asm volatile ( \ |
210 | " .globl " #x "\n" \ | |
211 | #x ":\n" \ | |
212 | " lwi $r16, [$gp + (%0)]\n" \ | |
213 | " lwi $r16, [$r16 + (%1)]\n" \ | |
214 | " jr $r16\n" \ | |
49cad547 | 215 | : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "$r16"); |
3553493d SK |
216 | #elif defined(CONFIG_OPENRISC) |
217 | /* | |
218 | * r10 holds the pointer to the global_data, r13 is a call-clobbered | |
219 | * register | |
220 | */ | |
49cad547 | 221 | #define EXPORT_FUNC(f, a, x, ...) \ |
3553493d SK |
222 | asm volatile ( \ |
223 | " .globl " #x "\n" \ | |
224 | #x ":\n" \ | |
225 | " l.lwz r13, %0(r10)\n" \ | |
226 | " l.lwz r13, %1(r13)\n" \ | |
227 | " l.jr r13\n" \ | |
228 | " l.nop\n" \ | |
49cad547 | 229 | : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r13"); |
794ab574 AB |
230 | #elif defined(CONFIG_ARC) |
231 | /* | |
232 | * r25 holds the pointer to the global_data. r10 is call clobbered. | |
233 | */ | |
49cad547 | 234 | #define EXPORT_FUNC(f, a, x, ...) \ |
794ab574 AB |
235 | asm volatile( \ |
236 | " .align 4\n" \ | |
237 | " .globl " #x "\n" \ | |
238 | #x ":\n" \ | |
239 | " ld r10, [r25, %0]\n" \ | |
240 | " ld r10, [r10, %1]\n" \ | |
241 | " j [r10]\n" \ | |
49cad547 | 242 | : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r10"); |
de5e5cea CZ |
243 | #elif defined(CONFIG_XTENSA) |
244 | /* | |
245 | * Global data ptr is in global_data, jump table ptr is in jt. | |
246 | * Windowed ABI: Jump just past 'entry' in target and adjust stack frame | |
247 | * (extract stack frame size from target 'entry' instruction). | |
248 | */ | |
249 | ||
250 | static void **jt; | |
251 | ||
252 | #if defined(__XTENSA_CALL0_ABI__) | |
253 | #define EXPORT_FUNC(f, a, x, ...) \ | |
254 | asm volatile ( \ | |
255 | " .extern jt\n" \ | |
256 | " .globl " #x "\n" \ | |
257 | " .align 4\n" \ | |
258 | #x ":\n" \ | |
259 | " l32i a8, %0, 0\n" \ | |
260 | " l32i a8, a8, %1\n" \ | |
261 | " jx a8\n" \ | |
262 | : : "r"(jt), "i" (FO(x)) : "a8"); | |
263 | #elif defined(__XTENSA_WINDOWED_ABI__) | |
264 | #if XCHAL_HAVE_BE | |
265 | # define SFT "8" | |
266 | #else | |
267 | # define SFT "12" | |
268 | #endif | |
269 | #define EXPORT_FUNC(f, a, x, ...) \ | |
270 | asm volatile ( \ | |
271 | " .extern jt\n" \ | |
272 | " .globl " #x "\n" \ | |
273 | " .align 4\n" \ | |
274 | #x ":\n" \ | |
275 | " entry sp, 16\n" \ | |
276 | " l32i a8, %0, 0\n" \ | |
277 | " l32i a8, a8, %1\n" \ | |
278 | " l32i a9, a8, 0\n" \ | |
279 | " extui a9, a9, " SFT ", 12\n" \ | |
280 | " subx8 a9, a9, sp\n" \ | |
281 | " movi a10, 16\n" \ | |
282 | " sub a9, a10, a9\n" \ | |
283 | " movsp sp, a9\n" \ | |
284 | " addi a8, a8, 3\n" \ | |
285 | " jx a8\n" \ | |
286 | : : "r"(jt), "i" (FO(x)) : "a8", "a9", "a10"); | |
287 | #else | |
288 | #error Unsupported Xtensa ABI | |
289 | #endif | |
27b207fd | 290 | #else |
72c73dde ML |
291 | /*" addi $sp, $sp, -24\n" \ |
292 | " br $r16\n" \*/ | |
293 | ||
27b207fd WD |
294 | #error stubs definition missing for this architecture |
295 | #endif | |
296 | ||
297 | /* This function is necessary to prevent the compiler from | |
298 | * generating prologue/epilogue, preparing stack frame etc. | |
299 | * The stub functions are special, they do not use the stack | |
300 | * frame passed to them, but pass it intact to the actual | |
301 | * implementation. On the other hand, asm() statements with | |
302 | * arguments can be used only inside the functions (gcc limitation) | |
303 | */ | |
2d5db193 | 304 | #if GCC_VERSION < 30400 |
93f6a677 WD |
305 | static |
306 | #endif /* GCC_VERSION */ | |
307 | void __attribute__((unused)) dummy(void) | |
27b207fd WD |
308 | { |
309 | #include <_exports.h> | |
310 | } | |
311 | ||
716cc8cc | 312 | #include <asm/sections.h> |
d716b126 | 313 | |
54841ab5 | 314 | void app_startup(char * const *argv) |
27b207fd | 315 | { |
716cc8cc | 316 | char *cp = __bss_start; |
d716b126 WD |
317 | |
318 | /* Zero out BSS */ | |
716cc8cc | 319 | while (cp < _end) |
d716b126 | 320 | *cp++ = 0; |
d716b126 | 321 | |
fea25720 | 322 | #if defined(CONFIG_X86) |
27b207fd | 323 | /* x86 does not have a dedicated register for passing global_data */ |
77846748 WD |
324 | global_data = (gd_t *)argv[-1]; |
325 | jt = global_data->jt; | |
27b207fd WD |
326 | #endif |
327 | } | |
328 | ||
329 | #undef EXPORT_FUNC |