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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>
Masahiro Yamada2d5db192014-09-04 02:40:59 +09003#include <linux/compiler.h>
wdenk93f6a672004-07-01 20:28:03 +00004
Martin Dorwig49cad542015-01-26 15:22:54 -07005#define FO(x) offsetof(struct jt_funcs, x)
6
Graeme Russfea25722011-04-13 19:43:28 +10007#if defined(CONFIG_X86)
wdenk27b207f2003-07-24 23:38:38 +00008/*
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 */
Martin Dorwig49cad542015-01-26 15:22:54 -070015static struct jt_funcs *jt;
wdenk77846742003-07-26 08:08:08 +000016gd_t *global_data;
wdenk27b207f2003-07-24 23:38:38 +000017
Martin Dorwig49cad542015-01-26 15:22:54 -070018#define EXPORT_FUNC(f, a, x, ...) \
wdenk27b207f2003-07-24 23:38:38 +000019 asm volatile ( \
20" .globl " #x "\n" \
21#x ":\n" \
22" movl %0, %%eax\n" \
23" movl jt, %%ecx\n" \
24" jmp *(%%ecx, %%eax)\n" \
Martin Dorwig49cad542015-01-26 15:22:54 -070025 : : "i"(FO(x)) : "eax", "ecx");
wdenk27b207f2003-07-24 23:38:38 +000026#elif defined(CONFIG_PPC)
27/*
Wolfgang Denke7670f62008-02-14 22:43:22 +010028 * r2 holds the pointer to the global_data, r11 is a call-clobbered
wdenk27b207f2003-07-24 23:38:38 +000029 * register
30 */
Martin Dorwig49cad542015-01-26 15:22:54 -070031#define EXPORT_FUNC(f, a, x, ...) \
wdenk27b207f2003-07-24 23:38:38 +000032 asm volatile ( \
33" .globl " #x "\n" \
34#x ":\n" \
Wolfgang Denke7670f62008-02-14 22:43:22 +010035" lwz %%r11, %0(%%r2)\n" \
wdenk27b207f2003-07-24 23:38:38 +000036" lwz %%r11, %1(%%r11)\n" \
37" mtctr %%r11\n" \
38" bctr\n" \
Martin Dorwig49cad542015-01-26 15:22:54 -070039 : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r11");
wdenk27b207f2003-07-24 23:38:38 +000040#elif defined(CONFIG_ARM)
David Feng0ae76532013-12-14 11:47:35 +080041#ifdef CONFIG_ARM64
42/*
43 * x18 holds the pointer to the global_data, x9 is a call-clobbered
44 * register
45 */
Martin Dorwig49cad542015-01-26 15:22:54 -070046#define EXPORT_FUNC(f, a, x, ...) \
David Feng0ae76532013-12-14 11:47:35 +080047 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" \
Martin Dorwig49cad542015-01-26 15:22:54 -070053 : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "x9");
David Feng0ae76532013-12-14 11:47:35 +080054#else
wdenk27b207f2003-07-24 23:38:38 +000055/*
Jeroen Hofsteea5a42ee2013-11-21 22:32:51 +010056 * r9 holds the pointer to the global_data, ip is a call-clobbered
wdenk27b207f2003-07-24 23:38:38 +000057 * register
58 */
Martin Dorwig49cad542015-01-26 15:22:54 -070059#define EXPORT_FUNC(f, a, x, ...) \
wdenk27b207f2003-07-24 23:38:38 +000060 asm volatile ( \
61" .globl " #x "\n" \
62#x ":\n" \
Jeroen Hofsteea5a42ee2013-11-21 22:32:51 +010063" ldr ip, [r9, %0]\n" \
wdenk27b207f2003-07-24 23:38:38 +000064" ldr pc, [ip, %1]\n" \
Martin Dorwig49cad542015-01-26 15:22:54 -070065 : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "ip");
David Feng0ae76532013-12-14 11:47:35 +080066#endif
wdenk27b207f2003-07-24 23:38:38 +000067#elif defined(CONFIG_MIPS)
68/*
69 * k0 ($26) holds the pointer to the global_data; t9 ($25) is a call-
70 * clobbered register that is also used to set gp ($26). Note that the
71 * jr instruction also executes the instruction immediately following
72 * it; however, GCC/mips generates an additional `nop' after each asm
73 * statement
74 */
Martin Dorwig49cad542015-01-26 15:22:54 -070075#define EXPORT_FUNC(f, a, x, ...) \
wdenk27b207f2003-07-24 23:38:38 +000076 asm volatile ( \
77" .globl " #x "\n" \
78#x ":\n" \
79" lw $25, %0($26)\n" \
80" lw $25, %1($25)\n" \
81" jr $25\n" \
Martin Dorwig49cad542015-01-26 15:22:54 -070082 : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "t9");
wdenk5c952cf2004-10-10 21:27:30 +000083#elif defined(CONFIG_NIOS2)
84/*
Thomas Chou0df01fd32010-05-21 11:08:03 +080085 * gp holds the pointer to the global_data, r8 is call-clobbered
wdenk5c952cf2004-10-10 21:27:30 +000086 */
Martin Dorwig49cad542015-01-26 15:22:54 -070087#define EXPORT_FUNC(f, a, x, ...) \
wdenk5c952cf2004-10-10 21:27:30 +000088 asm volatile ( \
89" .globl " #x "\n" \
90#x ":\n" \
91" movhi r8, %%hi(%0)\n" \
92" ori r8, r0, %%lo(%0)\n" \
Thomas Chou0df01fd32010-05-21 11:08:03 +080093" add r8, r8, gp\n" \
wdenk5c952cf2004-10-10 21:27:30 +000094" ldw r8, 0(r8)\n" \
95" ldw r8, %1(r8)\n" \
96" jmp r8\n" \
Martin Dorwig49cad542015-01-26 15:22:54 -070097 : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "gp");
wdenkbf9e3b32004-02-12 00:47:09 +000098#elif defined(CONFIG_M68K)
99/*
100 * d7 holds the pointer to the global_data, a0 is a call-clobbered
101 * register
102 */
Martin Dorwig49cad542015-01-26 15:22:54 -0700103#define EXPORT_FUNC(f, a, x, ...) \
wdenkbf9e3b32004-02-12 00:47:09 +0000104 asm volatile ( \
105" .globl " #x "\n" \
106#x ":\n" \
107" move.l %%d7, %%a0\n" \
108" adda.l %0, %%a0\n" \
109" move.l (%%a0), %%a0\n" \
110" adda.l %1, %%a0\n" \
111" move.l (%%a0), %%a0\n" \
112" jmp (%%a0)\n" \
Martin Dorwig49cad542015-01-26 15:22:54 -0700113 : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "a0");
wdenk857cad32004-07-10 23:48:41 +0000114#elif defined(CONFIG_MICROBLAZE)
wdenk507bbe32004-04-18 21:13:41 +0000115/*
116 * r31 holds the pointer to the global_data. r5 is a call-clobbered.
117 */
Martin Dorwig49cad542015-01-26 15:22:54 -0700118#define EXPORT_FUNC(f, a, x, ...) \
wdenk507bbe32004-04-18 21:13:41 +0000119 asm volatile ( \
120" .globl " #x "\n" \
121#x ":\n" \
122" lwi r5, r31, %0\n" \
123" lwi r5, r5, %1\n" \
124" bra r5\n" \
Martin Dorwig49cad542015-01-26 15:22:54 -0700125 : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r5");
Wolfgang Denk0afe5192006-03-12 02:10:00 +0100126#elif defined(CONFIG_BLACKFIN)
127/*
Robin Getzc4db3352009-08-17 15:23:02 +0000128 * P3 holds the pointer to the global_data, P0 is a call-clobbered
Wolfgang Denk0afe5192006-03-12 02:10:00 +0100129 * register
130 */
Martin Dorwig49cad542015-01-26 15:22:54 -0700131#define EXPORT_FUNC(f, a, x, ...) \
Wolfgang Denk8e7b7032006-03-12 02:55:22 +0100132 asm volatile ( \
Wolfgang Denk61fb15c52007-12-27 01:52:50 +0100133" .globl _" #x "\n_" \
Wolfgang Denk0afe5192006-03-12 02:10:00 +0100134#x ":\n" \
Robin Getzc4db3352009-08-17 15:23:02 +0000135" P0 = [P3 + %0]\n" \
Wolfgang Denk0afe5192006-03-12 02:10:00 +0100136" P0 = [P0 + %1]\n" \
137" JUMP (P0)\n" \
Martin Dorwig49cad542015-01-26 15:22:54 -0700138 : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "P0");
Wolfgang Denk7b64fef2006-10-24 14:21:16 +0200139#elif defined(CONFIG_AVR32)
140/*
141 * r6 holds the pointer to the global_data. r8 is call clobbered.
142 */
Martin Dorwig49cad542015-01-26 15:22:54 -0700143#define EXPORT_FUNC(f, a, x, ...) \
Wolfgang Denk7b64fef2006-10-24 14:21:16 +0200144 asm volatile( \
145 " .globl\t" #x "\n" \
146 #x ":\n" \
147 " ld.w r8, r6[%0]\n" \
148 " ld.w pc, r8[%1]\n" \
149 : \
Martin Dorwig49cad542015-01-26 15:22:54 -0700150 : "i"(offsetof(gd_t, jt)), "i"(FO(x)) \
Wolfgang Denk7b64fef2006-10-24 14:21:16 +0200151 : "r8");
Nobuhiro Iwamatsu0b135cf2007-05-13 20:58:00 +0900152#elif defined(CONFIG_SH)
153/*
154 * r13 holds the pointer to the global_data. r1 is a call clobbered.
155 */
Martin Dorwig49cad542015-01-26 15:22:54 -0700156#define EXPORT_FUNC(f, a, x, ...) \
Wolfgang Denk61fb15c52007-12-27 01:52:50 +0100157 asm volatile ( \
158 " .align 2\n" \
159 " .globl " #x "\n" \
160 #x ":\n" \
161 " mov r13, r1\n" \
162 " add %0, r1\n" \
Nobuhiro Iwamatsucae6f902008-10-09 13:54:33 +0900163 " mov.l @r1, r2\n" \
164 " add %1, r2\n" \
165 " mov.l @r2, r1\n" \
Wolfgang Denk61fb15c52007-12-27 01:52:50 +0100166 " jmp @r1\n" \
167 " nop\n" \
168 " nop\n" \
Martin Dorwig49cad542015-01-26 15:22:54 -0700169 : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r1", "r2");
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100170#elif defined(CONFIG_SPARC)
171/*
172 * g7 holds the pointer to the global_data. g1 is call clobbered.
173 */
Martin Dorwig49cad542015-01-26 15:22:54 -0700174#define EXPORT_FUNC(f, a, x, ...) \
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100175 asm volatile( \
176" .globl\t" #x "\n" \
177#x ":\n" \
178" set %0, %%g1\n" \
179" or %%g1, %%g7, %%g1\n" \
180" ld [%%g1], %%g1\n" \
181" ld [%%g1 + %1], %%g1\n" \
Sergey Mironov2c0c58b2009-09-23 16:47:38 +0400182" jmp %%g1\n" \
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100183" nop\n" \
Martin Dorwig49cad542015-01-26 15:22:54 -0700184 : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "g1");
Macpaul Lin72c73dd2011-10-11 22:33:20 +0000185#elif defined(CONFIG_NDS32)
186/*
187 * r16 holds the pointer to the global_data. gp is call clobbered.
188 * not support reduced register (16 GPR).
189 */
Martin Dorwig49cad542015-01-26 15:22:54 -0700190#define EXPORT_FUNC(f, a, x, ...) \
Macpaul Lin72c73dd2011-10-11 22:33:20 +0000191 asm volatile ( \
192" .globl " #x "\n" \
193#x ":\n" \
194" lwi $r16, [$gp + (%0)]\n" \
195" lwi $r16, [$r16 + (%1)]\n" \
196" jr $r16\n" \
Martin Dorwig49cad542015-01-26 15:22:54 -0700197 : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "$r16");
Stefan Kristiansson35534932011-11-18 19:21:35 +0000198#elif defined(CONFIG_OPENRISC)
199/*
200 * r10 holds the pointer to the global_data, r13 is a call-clobbered
201 * register
202 */
Martin Dorwig49cad542015-01-26 15:22:54 -0700203#define EXPORT_FUNC(f, a, x, ...) \
Stefan Kristiansson35534932011-11-18 19:21:35 +0000204 asm volatile ( \
205" .globl " #x "\n" \
206#x ":\n" \
207" l.lwz r13, %0(r10)\n" \
208" l.lwz r13, %1(r13)\n" \
209" l.jr r13\n" \
210" l.nop\n" \
Martin Dorwig49cad542015-01-26 15:22:54 -0700211 : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r13");
Alexey Brodkin794ab572014-02-04 12:56:17 +0400212#elif defined(CONFIG_ARC)
213/*
214 * r25 holds the pointer to the global_data. r10 is call clobbered.
215 */
Martin Dorwig49cad542015-01-26 15:22:54 -0700216#define EXPORT_FUNC(f, a, x, ...) \
Alexey Brodkin794ab572014-02-04 12:56:17 +0400217 asm volatile( \
218" .align 4\n" \
219" .globl " #x "\n" \
220#x ":\n" \
221" ld r10, [r25, %0]\n" \
222" ld r10, [r10, %1]\n" \
223" j [r10]\n" \
Martin Dorwig49cad542015-01-26 15:22:54 -0700224 : : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r10");
wdenk27b207f2003-07-24 23:38:38 +0000225#else
Macpaul Lin72c73dd2011-10-11 22:33:20 +0000226/*" addi $sp, $sp, -24\n" \
227" br $r16\n" \*/
228
wdenk27b207f2003-07-24 23:38:38 +0000229#error stubs definition missing for this architecture
230#endif
231
232/* This function is necessary to prevent the compiler from
233 * generating prologue/epilogue, preparing stack frame etc.
234 * The stub functions are special, they do not use the stack
235 * frame passed to them, but pass it intact to the actual
236 * implementation. On the other hand, asm() statements with
237 * arguments can be used only inside the functions (gcc limitation)
238 */
Masahiro Yamada2d5db192014-09-04 02:40:59 +0900239#if GCC_VERSION < 30400
wdenk93f6a672004-07-01 20:28:03 +0000240static
241#endif /* GCC_VERSION */
242void __attribute__((unused)) dummy(void)
wdenk27b207f2003-07-24 23:38:38 +0000243{
244#include <_exports.h>
245}
246
Simon Glass716cc8c2013-03-05 14:39:39 +0000247#include <asm/sections.h>
wdenkd716b122004-04-12 16:12:49 +0000248
Wolfgang Denk54841ab2010-06-28 22:00:46 +0200249void app_startup(char * const *argv)
wdenk27b207f2003-07-24 23:38:38 +0000250{
Simon Glass716cc8c2013-03-05 14:39:39 +0000251 char *cp = __bss_start;
wdenkd716b122004-04-12 16:12:49 +0000252
253 /* Zero out BSS */
Simon Glass716cc8c2013-03-05 14:39:39 +0000254 while (cp < _end)
wdenkd716b122004-04-12 16:12:49 +0000255 *cp++ = 0;
wdenkd716b122004-04-12 16:12:49 +0000256
Graeme Russfea25722011-04-13 19:43:28 +1000257#if defined(CONFIG_X86)
wdenk27b207f2003-07-24 23:38:38 +0000258 /* x86 does not have a dedicated register for passing global_data */
wdenk77846742003-07-26 08:08:08 +0000259 global_data = (gd_t *)argv[-1];
260 jt = global_data->jt;
wdenk27b207f2003-07-24 23:38:38 +0000261#endif
262}
263
264#undef EXPORT_FUNC