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  • Committer: Phil Dennis-Jordan
  • Date: 2017-07-21 08:03:43 UTC
  • mfrom: (1.1.1)
  • Revision ID: phil@philjordan.eu-20170721080343-2yr2vdj7713czahv
New upstream release 2.9.0.

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roms/u-boot/examples/standalone/stubs.c
 
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#include <common.h>
 
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#include <exports.h>
 
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#ifndef GCC_VERSION
 
5
#define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
 
6
#endif /* GCC_VERSION */
 
7
 
 
8
#if defined(CONFIG_X86)
 
9
/*
 
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
 
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 * from flash memory. The global_data address is passed as argv[-1]
 
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 * to the application program.
 
15
 */
 
16
static void **jt;
 
17
gd_t *global_data;
 
18
 
 
19
#define EXPORT_FUNC(x) \
 
20
        asm volatile (                  \
 
21
"       .globl " #x "\n"                \
 
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#x ":\n"                                \
 
23
"       movl    %0, %%eax\n"            \
 
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"       movl    jt, %%ecx\n"            \
 
25
"       jmp     *(%%ecx, %%eax)\n"      \
 
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        : : "i"(XF_ ## x * sizeof(void *)) : "eax", "ecx");
 
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#elif defined(CONFIG_PPC)
 
28
/*
 
29
 * r2 holds the pointer to the global_data, r11 is a call-clobbered
 
30
 * register
 
31
 */
 
32
#define EXPORT_FUNC(x) \
 
33
        asm volatile (                  \
 
34
"       .globl " #x "\n"                \
 
35
#x ":\n"                                \
 
36
"       lwz     %%r11, %0(%%r2)\n"      \
 
37
"       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
#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
 
56
/*
 
57
 * r9 holds the pointer to the global_data, ip is a call-clobbered
 
58
 * register
 
59
 */
 
60
#define EXPORT_FUNC(x) \
 
61
        asm volatile (                  \
 
62
"       .globl " #x "\n"                \
 
63
#x ":\n"                                \
 
64
"       ldr     ip, [r9, %0]\n"         \
 
65
"       ldr     pc, [ip, %1]\n"         \
 
66
        : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "ip");
 
67
#endif
 
68
#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");
 
84
#elif defined(CONFIG_NIOS2)
 
85
/*
 
86
 * gp holds the pointer to the global_data, r8 is call-clobbered
 
87
 */
 
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"     \
 
94
"       add     r8, r8, gp\n"           \
 
95
"       ldw     r8, 0(r8)\n"            \
 
96
"       ldw     r8, %1(r8)\n"           \
 
97
"       jmp     r8\n"                   \
 
98
        : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "gp");
 
99
#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");
 
115
#elif defined(CONFIG_MICROBLAZE)
 
116
/*
 
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");
 
127
#elif defined(CONFIG_BLACKFIN)
 
128
/*
 
129
 * P3 holds the pointer to the global_data, P0 is a call-clobbered
 
130
 * register
 
131
 */
 
132
#define EXPORT_FUNC(x)                  \
 
133
        asm volatile (                  \
 
134
"       .globl _" #x "\n_"              \
 
135
#x ":\n"                                \
 
136
"       P0 = [P3 + %0]\n"               \
 
137
"       P0 = [P0 + %1]\n"               \
 
138
"       JUMP (P0)\n"                    \
 
139
        : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "P0");
 
140
#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");
 
153
#elif defined(CONFIG_SH)
 
154
/*
 
155
 * r13 holds the pointer to the global_data. r1 is a call clobbered.
 
156
 */
 
157
#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"               \
 
164
                "       mov.l @r1, r2\n"        \
 
165
                "       add     %1, r2\n"               \
 
166
                "       mov.l @r2, r1\n"        \
 
167
                "       jmp     @r1\n"                  \
 
168
                "       nop\n"                          \
 
169
                "       nop\n"                          \
 
170
                : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r1", "r2");
 
171
#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"                         \
 
183
"       jmp %%g1\n"                                     \
 
184
"       nop\n"                                          \
 
185
        : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "g1" );
 
186
#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");
 
199
#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");
 
213
#elif defined(CONFIG_ARC)
 
214
/*
 
215
 * r25 holds the pointer to the global_data. r10 is call clobbered.
 
216
  */
 
217
#define EXPORT_FUNC(x) \
 
218
        asm volatile( \
 
219
"       .align 4\n" \
 
220
"       .globl " #x "\n" \
 
221
#x ":\n" \
 
222
"       ld      r10, [r25, %0]\n" \
 
223
"       ld      r10, [r10, %1]\n" \
 
224
"       j       [r10]\n" \
 
225
        : : "i"(offsetof(gd_t, jt)), "i"(XF_ ## x * sizeof(void *)) : "r10");
 
226
#else
 
227
/*"     addi    $sp, $sp, -24\n"        \
 
228
"       br      $r16\n"                 \*/
 
229
 
 
230
#error stubs definition missing for this architecture
 
231
#endif
 
232
 
 
233
/* This function is necessary to prevent the compiler from
 
234
 * generating prologue/epilogue, preparing stack frame etc.
 
235
 * The stub functions are special, they do not use the stack
 
236
 * frame passed to them, but pass it intact to the actual
 
237
 * implementation. On the other hand, asm() statements with
 
238
 * arguments can be used only inside the functions (gcc limitation)
 
239
 */
 
240
#if GCC_VERSION < 3004
 
241
static
 
242
#endif /* GCC_VERSION */
 
243
void __attribute__((unused)) dummy(void)
 
244
{
 
245
#include <_exports.h>
 
246
}
 
247
 
 
248
#include <asm/sections.h>
 
249
 
 
250
void app_startup(char * const *argv)
 
251
{
 
252
        char *cp = __bss_start;
 
253
 
 
254
        /* Zero out BSS */
 
255
        while (cp < _end)
 
256
                *cp++ = 0;
 
257
 
 
258
#if defined(CONFIG_X86)
 
259
        /* x86 does not have a dedicated register for passing global_data */
 
260
        global_data = (gd_t *)argv[-1];
 
261
        jt = global_data->jt;
 
262
#endif
 
263
}
 
264
 
 
265
#undef EXPORT_FUNC