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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"); |
7b64fef3 WD |
144 | #elif defined(CONFIG_AVR32) |
145 | /* | |
146 | * r6 holds the pointer to the global_data. r8 is call clobbered. | |
147 | */ | |
49cad547 | 148 | #define EXPORT_FUNC(f, a, x, ...) \ |
7b64fef3 WD |
149 | asm volatile( \ |
150 | " .globl\t" #x "\n" \ | |
151 | #x ":\n" \ | |
152 | " ld.w r8, r6[%0]\n" \ | |
153 | " ld.w pc, r8[%1]\n" \ | |
154 | : \ | |
49cad547 | 155 | : "i"(offsetof(gd_t, jt)), "i"(FO(x)) \ |
7b64fef3 | 156 | : "r8"); |
0b135cfc NI |
157 | #elif defined(CONFIG_SH) |
158 | /* | |
159 | * r13 holds the pointer to the global_data. r1 is a call clobbered. | |
160 | */ | |
49cad547 | 161 | #define EXPORT_FUNC(f, a, x, ...) \ |
61fb15c5 WD |
162 | asm volatile ( \ |
163 | " .align 2\n" \ | |
164 | " .globl " #x "\n" \ | |
165 | #x ":\n" \ | |
166 | " mov r13, r1\n" \ | |
167 | " add %0, r1\n" \ | |
cae6f909 NI |
168 | " mov.l @r1, r2\n" \ |
169 | " add %1, r2\n" \ | |
170 | " mov.l @r2, r1\n" \ | |
61fb15c5 WD |
171 | " jmp @r1\n" \ |
172 | " nop\n" \ | |
173 | " nop\n" \ | |
49cad547 | 174 | : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r1", "r2"); |
72c73dde ML |
175 | #elif defined(CONFIG_NDS32) |
176 | /* | |
177 | * r16 holds the pointer to the global_data. gp is call clobbered. | |
178 | * not support reduced register (16 GPR). | |
179 | */ | |
49cad547 | 180 | #define EXPORT_FUNC(f, a, x, ...) \ |
72c73dde ML |
181 | asm volatile ( \ |
182 | " .globl " #x "\n" \ | |
183 | #x ":\n" \ | |
184 | " lwi $r16, [$gp + (%0)]\n" \ | |
185 | " lwi $r16, [$r16 + (%1)]\n" \ | |
186 | " jr $r16\n" \ | |
49cad547 | 187 | : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "$r16"); |
3553493d SK |
188 | #elif defined(CONFIG_OPENRISC) |
189 | /* | |
190 | * r10 holds the pointer to the global_data, r13 is a call-clobbered | |
191 | * register | |
192 | */ | |
49cad547 | 193 | #define EXPORT_FUNC(f, a, x, ...) \ |
3553493d SK |
194 | asm volatile ( \ |
195 | " .globl " #x "\n" \ | |
196 | #x ":\n" \ | |
197 | " l.lwz r13, %0(r10)\n" \ | |
198 | " l.lwz r13, %1(r13)\n" \ | |
199 | " l.jr r13\n" \ | |
200 | " l.nop\n" \ | |
49cad547 | 201 | : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r13"); |
794ab574 AB |
202 | #elif defined(CONFIG_ARC) |
203 | /* | |
204 | * r25 holds the pointer to the global_data. r10 is call clobbered. | |
205 | */ | |
49cad547 | 206 | #define EXPORT_FUNC(f, a, x, ...) \ |
794ab574 AB |
207 | asm volatile( \ |
208 | " .align 4\n" \ | |
209 | " .globl " #x "\n" \ | |
210 | #x ":\n" \ | |
211 | " ld r10, [r25, %0]\n" \ | |
212 | " ld r10, [r10, %1]\n" \ | |
213 | " j [r10]\n" \ | |
49cad547 | 214 | : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r10"); |
de5e5cea CZ |
215 | #elif defined(CONFIG_XTENSA) |
216 | /* | |
217 | * Global data ptr is in global_data, jump table ptr is in jt. | |
218 | * Windowed ABI: Jump just past 'entry' in target and adjust stack frame | |
219 | * (extract stack frame size from target 'entry' instruction). | |
220 | */ | |
221 | ||
222 | static void **jt; | |
223 | ||
224 | #if defined(__XTENSA_CALL0_ABI__) | |
225 | #define EXPORT_FUNC(f, a, x, ...) \ | |
226 | asm volatile ( \ | |
227 | " .extern jt\n" \ | |
228 | " .globl " #x "\n" \ | |
229 | " .align 4\n" \ | |
230 | #x ":\n" \ | |
231 | " l32i a8, %0, 0\n" \ | |
232 | " l32i a8, a8, %1\n" \ | |
233 | " jx a8\n" \ | |
234 | : : "r"(jt), "i" (FO(x)) : "a8"); | |
235 | #elif defined(__XTENSA_WINDOWED_ABI__) | |
236 | #if XCHAL_HAVE_BE | |
237 | # define SFT "8" | |
238 | #else | |
239 | # define SFT "12" | |
240 | #endif | |
241 | #define EXPORT_FUNC(f, a, x, ...) \ | |
242 | asm volatile ( \ | |
243 | " .extern jt\n" \ | |
244 | " .globl " #x "\n" \ | |
245 | " .align 4\n" \ | |
246 | #x ":\n" \ | |
247 | " entry sp, 16\n" \ | |
248 | " l32i a8, %0, 0\n" \ | |
249 | " l32i a8, a8, %1\n" \ | |
250 | " l32i a9, a8, 0\n" \ | |
251 | " extui a9, a9, " SFT ", 12\n" \ | |
252 | " subx8 a9, a9, sp\n" \ | |
253 | " movi a10, 16\n" \ | |
254 | " sub a9, a10, a9\n" \ | |
255 | " movsp sp, a9\n" \ | |
256 | " addi a8, a8, 3\n" \ | |
257 | " jx a8\n" \ | |
258 | : : "r"(jt), "i" (FO(x)) : "a8", "a9", "a10"); | |
259 | #else | |
260 | #error Unsupported Xtensa ABI | |
261 | #endif | |
27b207fd | 262 | #else |
72c73dde ML |
263 | /*" addi $sp, $sp, -24\n" \ |
264 | " br $r16\n" \*/ | |
265 | ||
27b207fd WD |
266 | #error stubs definition missing for this architecture |
267 | #endif | |
268 | ||
269 | /* This function is necessary to prevent the compiler from | |
270 | * generating prologue/epilogue, preparing stack frame etc. | |
271 | * The stub functions are special, they do not use the stack | |
272 | * frame passed to them, but pass it intact to the actual | |
273 | * implementation. On the other hand, asm() statements with | |
274 | * arguments can be used only inside the functions (gcc limitation) | |
275 | */ | |
2d5db193 | 276 | #if GCC_VERSION < 30400 |
93f6a677 WD |
277 | static |
278 | #endif /* GCC_VERSION */ | |
279 | void __attribute__((unused)) dummy(void) | |
27b207fd WD |
280 | { |
281 | #include <_exports.h> | |
282 | } | |
283 | ||
716cc8cc | 284 | #include <asm/sections.h> |
d716b126 | 285 | |
54841ab5 | 286 | void app_startup(char * const *argv) |
27b207fd | 287 | { |
716cc8cc | 288 | char *cp = __bss_start; |
d716b126 WD |
289 | |
290 | /* Zero out BSS */ | |
716cc8cc | 291 | while (cp < _end) |
d716b126 | 292 | *cp++ = 0; |
d716b126 | 293 | |
fea25720 | 294 | #if defined(CONFIG_X86) |
27b207fd | 295 | /* x86 does not have a dedicated register for passing global_data */ |
77846748 WD |
296 | global_data = (gd_t *)argv[-1]; |
297 | jt = global_data->jt; | |
27b207fd WD |
298 | #endif |
299 | } | |
300 | ||
301 | #undef EXPORT_FUNC |