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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)
42/*
43 * r8 holds the pointer to the global_data, ip is a call-clobbered
44 * register
45 */
46#define EXPORT_FUNC(x) \
47 asm volatile ( \
48" .globl " #x "\n" \
49#x ":\n" \
50" ldr ip, [r8, %0]\n" \
51" ldr pc, [ip, %1]\n" \
52 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "ip");
53#elif defined(CONFIG_MIPS)
54/*
55 * k0 ($26) holds the pointer to the global_data; t9 ($25) is a call-
56 * clobbered register that is also used to set gp ($26). Note that the
57 * jr instruction also executes the instruction immediately following
58 * it; however, GCC/mips generates an additional `nop' after each asm
59 * statement
60 */
61#define EXPORT_FUNC(x) \
62 asm volatile ( \
63" .globl " #x "\n" \
64#x ":\n" \
65" lw $25, %0($26)\n" \
66" lw $25, %1($25)\n" \
67" jr $25\n" \
68 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "t9");
wdenk5c952cf2004-10-10 21:27:30 +000069#elif defined(CONFIG_NIOS2)
70/*
Thomas Chou0df01fd2010-05-21 11:08:03 +080071 * gp holds the pointer to the global_data, r8 is call-clobbered
wdenk5c952cf2004-10-10 21:27:30 +000072 */
73#define EXPORT_FUNC(x) \
74 asm volatile ( \
75" .globl " #x "\n" \
76#x ":\n" \
77" movhi r8, %%hi(%0)\n" \
78" ori r8, r0, %%lo(%0)\n" \
Thomas Chou0df01fd2010-05-21 11:08:03 +080079" add r8, r8, gp\n" \
wdenk5c952cf2004-10-10 21:27:30 +000080" ldw r8, 0(r8)\n" \
81" ldw r8, %1(r8)\n" \
82" jmp r8\n" \
Thomas Chou0df01fd2010-05-21 11:08:03 +080083 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "gp");
wdenkbf9e3b32004-02-12 00:47:09 +000084#elif defined(CONFIG_M68K)
85/*
86 * d7 holds the pointer to the global_data, a0 is a call-clobbered
87 * register
88 */
89#define EXPORT_FUNC(x) \
90 asm volatile ( \
91" .globl " #x "\n" \
92#x ":\n" \
93" move.l %%d7, %%a0\n" \
94" adda.l %0, %%a0\n" \
95" move.l (%%a0), %%a0\n" \
96" adda.l %1, %%a0\n" \
97" move.l (%%a0), %%a0\n" \
98" jmp (%%a0)\n" \
99 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "a0");
wdenk857cad32004-07-10 23:48:41 +0000100#elif defined(CONFIG_MICROBLAZE)
wdenk507bbe32004-04-18 21:13:41 +0000101/*
102 * r31 holds the pointer to the global_data. r5 is a call-clobbered.
103 */
104#define EXPORT_FUNC(x) \
105 asm volatile ( \
106" .globl " #x "\n" \
107#x ":\n" \
108" lwi r5, r31, %0\n" \
109" lwi r5, r5, %1\n" \
110" bra r5\n" \
111 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r5");
Wolfgang Denk0afe5192006-03-12 02:10:00 +0100112#elif defined(CONFIG_BLACKFIN)
113/*
Robin Getzc4db3352009-08-17 15:23:02 +0000114 * P3 holds the pointer to the global_data, P0 is a call-clobbered
Wolfgang Denk0afe5192006-03-12 02:10:00 +0100115 * register
116 */
117#define EXPORT_FUNC(x) \
Wolfgang Denk8e7b7032006-03-12 02:55:22 +0100118 asm volatile ( \
Wolfgang Denk61fb15c52007-12-27 01:52:50 +0100119" .globl _" #x "\n_" \
Wolfgang Denk0afe5192006-03-12 02:10:00 +0100120#x ":\n" \
Robin Getzc4db3352009-08-17 15:23:02 +0000121" P0 = [P3 + %0]\n" \
Wolfgang Denk0afe5192006-03-12 02:10:00 +0100122" P0 = [P0 + %1]\n" \
123" JUMP (P0)\n" \
124 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "P0");
Wolfgang Denk7b64fef2006-10-24 14:21:16 +0200125#elif defined(CONFIG_AVR32)
126/*
127 * r6 holds the pointer to the global_data. r8 is call clobbered.
128 */
129#define EXPORT_FUNC(x) \
130 asm volatile( \
131 " .globl\t" #x "\n" \
132 #x ":\n" \
133 " ld.w r8, r6[%0]\n" \
134 " ld.w pc, r8[%1]\n" \
135 : \
136 : "i"(offsetof(gd_t, jt)), "i"(XF_ ##x) \
137 : "r8");
Nobuhiro Iwamatsu0b135cf2007-05-13 20:58:00 +0900138#elif defined(CONFIG_SH)
139/*
140 * r13 holds the pointer to the global_data. r1 is a call clobbered.
141 */
Wolfgang Denk61fb15c52007-12-27 01:52:50 +0100142#define EXPORT_FUNC(x) \
143 asm volatile ( \
144 " .align 2\n" \
145 " .globl " #x "\n" \
146 #x ":\n" \
147 " mov r13, r1\n" \
148 " add %0, r1\n" \
Nobuhiro Iwamatsucae6f902008-10-09 13:54:33 +0900149 " mov.l @r1, r2\n" \
150 " add %1, r2\n" \
151 " mov.l @r2, r1\n" \
Wolfgang Denk61fb15c52007-12-27 01:52:50 +0100152 " jmp @r1\n" \
153 " nop\n" \
154 " nop\n" \
Nobuhiro Iwamatsucae6f902008-10-09 13:54:33 +0900155 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r1", "r2");
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100156#elif defined(CONFIG_SPARC)
157/*
158 * g7 holds the pointer to the global_data. g1 is call clobbered.
159 */
160#define EXPORT_FUNC(x) \
161 asm volatile( \
162" .globl\t" #x "\n" \
163#x ":\n" \
164" set %0, %%g1\n" \
165" or %%g1, %%g7, %%g1\n" \
166" ld [%%g1], %%g1\n" \
167" ld [%%g1 + %1], %%g1\n" \
Sergey Mironov2c0c58b2009-09-23 16:47:38 +0400168" jmp %%g1\n" \
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100169" nop\n" \
Sergey Mironov2c0c58b2009-09-23 16:47:38 +0400170 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "g1" );
Macpaul Lin72c73dd2011-10-11 22:33:20 +0000171#elif defined(CONFIG_NDS32)
172/*
173 * r16 holds the pointer to the global_data. gp is call clobbered.
174 * not support reduced register (16 GPR).
175 */
176#define EXPORT_FUNC(x) \
177 asm volatile ( \
178" .globl " #x "\n" \
179#x ":\n" \
180" lwi $r16, [$gp + (%0)]\n" \
181" lwi $r16, [$r16 + (%1)]\n" \
182" jr $r16\n" \
183 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "$r16");
Stefan Kristiansson35534932011-11-18 19:21:35 +0000184#elif defined(CONFIG_OPENRISC)
185/*
186 * r10 holds the pointer to the global_data, r13 is a call-clobbered
187 * register
188 */
189#define EXPORT_FUNC(x) \
190 asm volatile ( \
191" .globl " #x "\n" \
192#x ":\n" \
193" l.lwz r13, %0(r10)\n" \
194" l.lwz r13, %1(r13)\n" \
195" l.jr r13\n" \
196" l.nop\n" \
197 : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r13");
wdenk27b207f2003-07-24 23:38:38 +0000198#else
Macpaul Lin72c73dd2011-10-11 22:33:20 +0000199/*" addi $sp, $sp, -24\n" \
200" br $r16\n" \*/
201
wdenk27b207f2003-07-24 23:38:38 +0000202#error stubs definition missing for this architecture
203#endif
204
205/* This function is necessary to prevent the compiler from
206 * generating prologue/epilogue, preparing stack frame etc.
207 * The stub functions are special, they do not use the stack
208 * frame passed to them, but pass it intact to the actual
209 * implementation. On the other hand, asm() statements with
210 * arguments can be used only inside the functions (gcc limitation)
211 */
wdenk93f6a672004-07-01 20:28:03 +0000212#if GCC_VERSION < 3004
213static
214#endif /* GCC_VERSION */
215void __attribute__((unused)) dummy(void)
wdenk27b207f2003-07-24 23:38:38 +0000216{
217#include <_exports.h>
218}
219
Wolfgang Denk7ec830d2011-03-29 14:34:50 +0200220extern unsigned long __bss_start, _end;
wdenkd716b122004-04-12 16:12:49 +0000221
Wolfgang Denk54841ab2010-06-28 22:00:46 +0200222void app_startup(char * const *argv)
wdenk27b207f2003-07-24 23:38:38 +0000223{
Woodruff, Richard118978c2008-02-29 17:34:35 -0600224 unsigned char * cp = (unsigned char *) &__bss_start;
wdenkd716b122004-04-12 16:12:49 +0000225
226 /* Zero out BSS */
Wolfgang Denk7ec830d2011-03-29 14:34:50 +0200227 while (cp < (unsigned char *)&_end) {
wdenkd716b122004-04-12 16:12:49 +0000228 *cp++ = 0;
229 }
230
Graeme Russfea25722011-04-13 19:43:28 +1000231#if defined(CONFIG_X86)
wdenk27b207f2003-07-24 23:38:38 +0000232 /* x86 does not have a dedicated register for passing global_data */
wdenk77846742003-07-26 08:08:08 +0000233 global_data = (gd_t *)argv[-1];
234 jt = global_data->jt;
wdenk27b207f2003-07-24 23:38:38 +0000235#endif
236}
237
238#undef EXPORT_FUNC