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Mike Partington0910d0b2010-10-27 10:31:09 +00001#include <common.h>
wdenk27b207f2003-07-24 23:38:38 +00002#include <exports.h>
3
wdenk93f6a672004-07-01 20:28:03 +00004#ifndef GCC_VERSION
5#define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
6#endif /* GCC_VERSION */
7
Graeme Russfea25722011-04-13 19:43:28 +10008#if defined(CONFIG_X86)
wdenk27b207f2003-07-24 23:38:38 +00009/*
10 * x86 does not have a dedicated register to store the pointer to
11 * the global_data. Thus the jump table address is stored in a
12 * global variable, but such approach does not allow for execution
13 * from flash memory. The global_data address is passed as argv[-1]
14 * to the application program.
15 */
16static void **jt;
wdenk77846742003-07-26 08:08:08 +000017gd_t *global_data;
wdenk27b207f2003-07-24 23:38:38 +000018
19#define EXPORT_FUNC(x) \
20 asm volatile ( \
21" .globl " #x "\n" \
22#x ":\n" \
23" movl %0, %%eax\n" \
24" movl jt, %%ecx\n" \
25" jmp *(%%ecx, %%eax)\n" \
26 : : "i"(XF_ ## x * sizeof(void *)) : "eax", "ecx");
27#elif defined(CONFIG_PPC)
28/*
Wolfgang Denke7670f62008-02-14 22:43:22 +010029 * r2 holds the pointer to the global_data, r11 is a call-clobbered
wdenk27b207f2003-07-24 23:38:38 +000030 * register
31 */
32#define EXPORT_FUNC(x) \
33 asm volatile ( \
34" .globl " #x "\n" \
35#x ":\n" \
Wolfgang Denke7670f62008-02-14 22:43:22 +010036" lwz %%r11, %0(%%r2)\n" \
wdenk27b207f2003-07-24 23:38:38 +000037" lwz %%r11, %1(%%r11)\n" \
38" mtctr %%r11\n" \
39" bctr\n" \
40 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r11");
41#elif defined(CONFIG_ARM)
David Feng0ae76532013-12-14 11:47:35 +080042#ifdef CONFIG_ARM64
43/*
44 * x18 holds the pointer to the global_data, x9 is a call-clobbered
45 * register
46 */
47#define EXPORT_FUNC(x) \
48 asm volatile ( \
49" .globl " #x "\n" \
50#x ":\n" \
51" ldr x9, [x18, %0]\n" \
52" ldr x9, [x9, %1]\n" \
53" br x9\n" \
54 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "x9");
55#else
wdenk27b207f2003-07-24 23:38:38 +000056/*
Jeroen Hofsteea5a42ee2013-11-21 22:32:51 +010057 * r9 holds the pointer to the global_data, ip is a call-clobbered
wdenk27b207f2003-07-24 23:38:38 +000058 * register
59 */
60#define EXPORT_FUNC(x) \
61 asm volatile ( \
62" .globl " #x "\n" \
63#x ":\n" \
Jeroen Hofsteea5a42ee2013-11-21 22:32:51 +010064" ldr ip, [r9, %0]\n" \
wdenk27b207f2003-07-24 23:38:38 +000065" ldr pc, [ip, %1]\n" \
66 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "ip");
David Feng0ae76532013-12-14 11:47:35 +080067#endif
wdenk27b207f2003-07-24 23:38:38 +000068#elif defined(CONFIG_MIPS)
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(x) \
77 asm volatile ( \
78" .globl " #x "\n" \
79#x ":\n" \
80" lw $25, %0($26)\n" \
81" lw $25, %1($25)\n" \
82" jr $25\n" \
83 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "t9");
wdenk5c952cf2004-10-10 21:27:30 +000084#elif defined(CONFIG_NIOS2)
85/*
Thomas Chou0df01fd2010-05-21 11:08:03 +080086 * gp holds the pointer to the global_data, r8 is call-clobbered
wdenk5c952cf2004-10-10 21:27:30 +000087 */
88#define EXPORT_FUNC(x) \
89 asm volatile ( \
90" .globl " #x "\n" \
91#x ":\n" \
92" movhi r8, %%hi(%0)\n" \
93" ori r8, r0, %%lo(%0)\n" \
Thomas Chou0df01fd2010-05-21 11:08:03 +080094" add r8, r8, gp\n" \
wdenk5c952cf2004-10-10 21:27:30 +000095" ldw r8, 0(r8)\n" \
96" ldw r8, %1(r8)\n" \
97" jmp r8\n" \
Thomas Chou0df01fd2010-05-21 11:08:03 +080098 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "gp");
wdenkbf9e3b32004-02-12 00:47:09 +000099#elif defined(CONFIG_M68K)
100/*
101 * d7 holds the pointer to the global_data, a0 is a call-clobbered
102 * register
103 */
104#define EXPORT_FUNC(x) \
105 asm volatile ( \
106" .globl " #x "\n" \
107#x ":\n" \
108" move.l %%d7, %%a0\n" \
109" adda.l %0, %%a0\n" \
110" move.l (%%a0), %%a0\n" \
111" adda.l %1, %%a0\n" \
112" move.l (%%a0), %%a0\n" \
113" jmp (%%a0)\n" \
114 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "a0");
wdenk857cad32004-07-10 23:48:41 +0000115#elif defined(CONFIG_MICROBLAZE)
wdenk507bbe32004-04-18 21:13:41 +0000116/*
117 * r31 holds the pointer to the global_data. r5 is a call-clobbered.
118 */
119#define EXPORT_FUNC(x) \
120 asm volatile ( \
121" .globl " #x "\n" \
122#x ":\n" \
123" lwi r5, r31, %0\n" \
124" lwi r5, r5, %1\n" \
125" bra r5\n" \
126 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r5");
Wolfgang Denk0afe5192006-03-12 02:10:00 +0100127#elif defined(CONFIG_BLACKFIN)
128/*
Robin Getzc4db3352009-08-17 15:23:02 +0000129 * P3 holds the pointer to the global_data, P0 is a call-clobbered
Wolfgang Denk0afe5192006-03-12 02:10:00 +0100130 * register
131 */
132#define EXPORT_FUNC(x) \
Wolfgang Denk8e7b7032006-03-12 02:55:22 +0100133 asm volatile ( \
Wolfgang Denk61fb15c52007-12-27 01:52:50 +0100134" .globl _" #x "\n_" \
Wolfgang Denk0afe5192006-03-12 02:10:00 +0100135#x ":\n" \
Robin Getzc4db3352009-08-17 15:23:02 +0000136" P0 = [P3 + %0]\n" \
Wolfgang Denk0afe5192006-03-12 02:10:00 +0100137" P0 = [P0 + %1]\n" \
138" JUMP (P0)\n" \
139 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "P0");
Wolfgang Denk7b64fef2006-10-24 14:21:16 +0200140#elif defined(CONFIG_AVR32)
141/*
142 * r6 holds the pointer to the global_data. r8 is call clobbered.
143 */
144#define EXPORT_FUNC(x) \
145 asm volatile( \
146 " .globl\t" #x "\n" \
147 #x ":\n" \
148 " ld.w r8, r6[%0]\n" \
149 " ld.w pc, r8[%1]\n" \
150 : \
151 : "i"(offsetof(gd_t, jt)), "i"(XF_ ##x) \
152 : "r8");
Nobuhiro Iwamatsu0b135cf2007-05-13 20:58:00 +0900153#elif defined(CONFIG_SH)
154/*
155 * r13 holds the pointer to the global_data. r1 is a call clobbered.
156 */
Wolfgang Denk61fb15c52007-12-27 01:52:50 +0100157#define EXPORT_FUNC(x) \
158 asm volatile ( \
159 " .align 2\n" \
160 " .globl " #x "\n" \
161 #x ":\n" \
162 " mov r13, r1\n" \
163 " add %0, r1\n" \
Nobuhiro Iwamatsucae6f902008-10-09 13:54:33 +0900164 " mov.l @r1, r2\n" \
165 " add %1, r2\n" \
166 " mov.l @r2, r1\n" \
Wolfgang Denk61fb15c52007-12-27 01:52:50 +0100167 " jmp @r1\n" \
168 " nop\n" \
169 " nop\n" \
Nobuhiro Iwamatsucae6f902008-10-09 13:54:33 +0900170 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r1", "r2");
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100171#elif defined(CONFIG_SPARC)
172/*
173 * g7 holds the pointer to the global_data. g1 is call clobbered.
174 */
175#define EXPORT_FUNC(x) \
176 asm volatile( \
177" .globl\t" #x "\n" \
178#x ":\n" \
179" set %0, %%g1\n" \
180" or %%g1, %%g7, %%g1\n" \
181" ld [%%g1], %%g1\n" \
182" ld [%%g1 + %1], %%g1\n" \
Sergey Mironov2c0c58b2009-09-23 16:47:38 +0400183" jmp %%g1\n" \
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100184" nop\n" \
Sergey Mironov2c0c58b2009-09-23 16:47:38 +0400185 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "g1" );
Macpaul Lin72c73dd2011-10-11 22:33:20 +0000186#elif defined(CONFIG_NDS32)
187/*
188 * r16 holds the pointer to the global_data. gp is call clobbered.
189 * not support reduced register (16 GPR).
190 */
191#define EXPORT_FUNC(x) \
192 asm volatile ( \
193" .globl " #x "\n" \
194#x ":\n" \
195" lwi $r16, [$gp + (%0)]\n" \
196" lwi $r16, [$r16 + (%1)]\n" \
197" jr $r16\n" \
198 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "$r16");
Stefan Kristiansson35534932011-11-18 19:21:35 +0000199#elif defined(CONFIG_OPENRISC)
200/*
201 * r10 holds the pointer to the global_data, r13 is a call-clobbered
202 * register
203 */
204#define EXPORT_FUNC(x) \
205 asm volatile ( \
206" .globl " #x "\n" \
207#x ":\n" \
208" l.lwz r13, %0(r10)\n" \
209" l.lwz r13, %1(r13)\n" \
210" l.jr r13\n" \
211" l.nop\n" \
212 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r13");
wdenk27b207f2003-07-24 23:38:38 +0000213#else
Macpaul Lin72c73dd2011-10-11 22:33:20 +0000214/*" addi $sp, $sp, -24\n" \
215" br $r16\n" \*/
216
wdenk27b207f2003-07-24 23:38:38 +0000217#error stubs definition missing for this architecture
218#endif
219
220/* This function is necessary to prevent the compiler from
221 * generating prologue/epilogue, preparing stack frame etc.
222 * The stub functions are special, they do not use the stack
223 * frame passed to them, but pass it intact to the actual
224 * implementation. On the other hand, asm() statements with
225 * arguments can be used only inside the functions (gcc limitation)
226 */
wdenk93f6a672004-07-01 20:28:03 +0000227#if GCC_VERSION < 3004
228static
229#endif /* GCC_VERSION */
230void __attribute__((unused)) dummy(void)
wdenk27b207f2003-07-24 23:38:38 +0000231{
232#include <_exports.h>
233}
234
Simon Glass716cc8c2013-03-05 14:39:39 +0000235#include <asm/sections.h>
wdenkd716b122004-04-12 16:12:49 +0000236
Wolfgang Denk54841ab2010-06-28 22:00:46 +0200237void app_startup(char * const *argv)
wdenk27b207f2003-07-24 23:38:38 +0000238{
Simon Glass716cc8c2013-03-05 14:39:39 +0000239 char *cp = __bss_start;
wdenkd716b122004-04-12 16:12:49 +0000240
241 /* Zero out BSS */
Simon Glass716cc8c2013-03-05 14:39:39 +0000242 while (cp < _end)
wdenkd716b122004-04-12 16:12:49 +0000243 *cp++ = 0;
wdenkd716b122004-04-12 16:12:49 +0000244
Graeme Russfea25722011-04-13 19:43:28 +1000245#if defined(CONFIG_X86)
wdenk27b207f2003-07-24 23:38:38 +0000246 /* x86 does not have a dedicated register for passing global_data */
wdenk77846742003-07-26 08:08:08 +0000247 global_data = (gd_t *)argv[-1];
248 jt = global_data->jt;
wdenk27b207f2003-07-24 23:38:38 +0000249#endif
250}
251
252#undef EXPORT_FUNC