mirror of
https://github.com/AsahiLinux/u-boot
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282 lines
7.1 KiB
C
282 lines
7.1 KiB
C
#include <common.h>
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#include <exports.h>
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#include <linux/compiler.h>
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#define FO(x) offsetof(struct jt_funcs, x)
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#if defined(CONFIG_X86)
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/*
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* x86 does not have a dedicated register to store the pointer to
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* the global_data. Thus the jump table address is stored in a
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* 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.
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*/
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static struct jt_funcs *jt;
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gd_t *global_data;
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#define EXPORT_FUNC(f, a, x, ...) \
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asm volatile ( \
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" .globl " #x "\n" \
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#x ":\n" \
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" movl %0, %%eax\n" \
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" movl jt, %%ecx\n" \
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" jmp *(%%ecx, %%eax)\n" \
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: : "i"(FO(x)) : "eax", "ecx");
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#elif defined(CONFIG_PPC)
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/*
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* r2 holds the pointer to the global_data, r11 is a call-clobbered
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* register
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*/
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#define EXPORT_FUNC(f, a, x, ...) \
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asm volatile ( \
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" .globl " #x "\n" \
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#x ":\n" \
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" lwz %%r11, %0(%%r2)\n" \
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" lwz %%r11, %1(%%r11)\n" \
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" mtctr %%r11\n" \
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" bctr\n" \
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: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r11");
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#elif defined(CONFIG_ARM)
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#ifdef CONFIG_ARM64
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/*
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* x18 holds the pointer to the global_data, x9 is a call-clobbered
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* register
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*/
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#define EXPORT_FUNC(f, a, x, ...) \
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asm volatile ( \
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" .globl " #x "\n" \
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#x ":\n" \
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" ldr x9, [x18, %0]\n" \
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" ldr x9, [x9, %1]\n" \
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" br x9\n" \
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: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "x9");
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#else
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/*
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* r9 holds the pointer to the global_data, ip is a call-clobbered
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* register
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*/
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#define EXPORT_FUNC(f, a, x, ...) \
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asm volatile ( \
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" .globl " #x "\n" \
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#x ":\n" \
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" ldr ip, [r9, %0]\n" \
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" ldr pc, [ip, %1]\n" \
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: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "ip");
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#endif
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#elif defined(CONFIG_MIPS)
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#ifdef CONFIG_CPU_MIPS64
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/*
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* k0 ($26) holds the pointer to the global_data; t9 ($25) is a call-
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* clobbered register that is also used to set gp ($26). Note that the
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* jr instruction also executes the instruction immediately following
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* it; however, GCC/mips generates an additional `nop' after each asm
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* statement
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*/
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#define EXPORT_FUNC(f, a, x, ...) \
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asm volatile ( \
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" .globl " #x "\n" \
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#x ":\n" \
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" ld $25, %0($26)\n" \
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" ld $25, %1($25)\n" \
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" jr $25\n" \
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: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "t9");
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#else
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/*
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* k0 ($26) holds the pointer to the global_data; t9 ($25) is a call-
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* clobbered register that is also used to set gp ($26). Note that the
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* jr instruction also executes the instruction immediately following
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* it; however, GCC/mips generates an additional `nop' after each asm
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* statement
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*/
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#define EXPORT_FUNC(f, a, x, ...) \
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asm volatile ( \
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" .globl " #x "\n" \
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#x ":\n" \
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" lw $25, %0($26)\n" \
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" lw $25, %1($25)\n" \
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" jr $25\n" \
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: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "t9");
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#endif
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#elif defined(CONFIG_NIOS2)
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/*
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* gp holds the pointer to the global_data, r8 is call-clobbered
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*/
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#define EXPORT_FUNC(f, a, x, ...) \
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asm volatile ( \
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" .globl " #x "\n" \
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#x ":\n" \
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" movhi r8, %%hi(%0)\n" \
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" ori r8, r0, %%lo(%0)\n" \
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" add r8, r8, gp\n" \
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" ldw r8, 0(r8)\n" \
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" ldw r8, %1(r8)\n" \
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" jmp r8\n" \
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: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "gp");
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#elif defined(CONFIG_M68K)
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/*
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* d7 holds the pointer to the global_data, a0 is a call-clobbered
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* register
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*/
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#define EXPORT_FUNC(f, a, x, ...) \
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asm volatile ( \
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" .globl " #x "\n" \
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#x ":\n" \
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" move.l %%d7, %%a0\n" \
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" adda.l %0, %%a0\n" \
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" move.l (%%a0), %%a0\n" \
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" adda.l %1, %%a0\n" \
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" move.l (%%a0), %%a0\n" \
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" jmp (%%a0)\n" \
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: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "a0");
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#elif defined(CONFIG_MICROBLAZE)
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/*
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* r31 holds the pointer to the global_data. r5 is a call-clobbered.
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*/
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#define EXPORT_FUNC(f, a, x, ...) \
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asm volatile ( \
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" .globl " #x "\n" \
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#x ":\n" \
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" lwi r5, r31, %0\n" \
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" lwi r5, r5, %1\n" \
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" bra r5\n" \
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: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r5");
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#elif defined(CONFIG_BLACKFIN)
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/*
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* P3 holds the pointer to the global_data, P0 is a call-clobbered
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* register
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*/
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#define EXPORT_FUNC(f, a, x, ...) \
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asm volatile ( \
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" .globl _" #x "\n_" \
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#x ":\n" \
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" P0 = [P3 + %0]\n" \
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" P0 = [P0 + %1]\n" \
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" JUMP (P0)\n" \
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: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "P0");
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#elif defined(CONFIG_AVR32)
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/*
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* r6 holds the pointer to the global_data. r8 is call clobbered.
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*/
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#define EXPORT_FUNC(f, a, x, ...) \
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asm volatile( \
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" .globl\t" #x "\n" \
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#x ":\n" \
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" ld.w r8, r6[%0]\n" \
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" ld.w pc, r8[%1]\n" \
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: \
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: "i"(offsetof(gd_t, jt)), "i"(FO(x)) \
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: "r8");
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#elif defined(CONFIG_SH)
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/*
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* r13 holds the pointer to the global_data. r1 is a call clobbered.
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*/
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#define EXPORT_FUNC(f, a, x, ...) \
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asm volatile ( \
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" .align 2\n" \
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" .globl " #x "\n" \
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#x ":\n" \
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" mov r13, r1\n" \
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" add %0, r1\n" \
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" mov.l @r1, r2\n" \
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" add %1, r2\n" \
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" mov.l @r2, r1\n" \
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" jmp @r1\n" \
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" nop\n" \
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" nop\n" \
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: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r1", "r2");
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#elif defined(CONFIG_SPARC)
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/*
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* g7 holds the pointer to the global_data. g1 is call clobbered.
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*/
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#define EXPORT_FUNC(f, a, x, ...) \
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asm volatile( \
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" .globl\t" #x "\n" \
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#x ":\n" \
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" set %0, %%g1\n" \
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" or %%g1, %%g7, %%g1\n" \
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" ld [%%g1], %%g1\n" \
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" ld [%%g1 + %1], %%g1\n" \
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" jmp %%g1\n" \
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" nop\n" \
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: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "g1");
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#elif defined(CONFIG_NDS32)
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/*
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* r16 holds the pointer to the global_data. gp is call clobbered.
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* not support reduced register (16 GPR).
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*/
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#define EXPORT_FUNC(f, a, x, ...) \
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asm volatile ( \
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" .globl " #x "\n" \
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#x ":\n" \
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" lwi $r16, [$gp + (%0)]\n" \
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" lwi $r16, [$r16 + (%1)]\n" \
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" jr $r16\n" \
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: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "$r16");
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#elif defined(CONFIG_OPENRISC)
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/*
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* r10 holds the pointer to the global_data, r13 is a call-clobbered
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* register
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*/
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#define EXPORT_FUNC(f, a, x, ...) \
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asm volatile ( \
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" .globl " #x "\n" \
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#x ":\n" \
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" l.lwz r13, %0(r10)\n" \
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" l.lwz r13, %1(r13)\n" \
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" l.jr r13\n" \
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" l.nop\n" \
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: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r13");
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#elif defined(CONFIG_ARC)
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/*
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* r25 holds the pointer to the global_data. r10 is call clobbered.
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*/
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#define EXPORT_FUNC(f, a, x, ...) \
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asm volatile( \
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" .align 4\n" \
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" .globl " #x "\n" \
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#x ":\n" \
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" ld r10, [r25, %0]\n" \
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" ld r10, [r10, %1]\n" \
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" j [r10]\n" \
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: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r10");
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#else
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/*" addi $sp, $sp, -24\n" \
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" br $r16\n" \*/
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#error stubs definition missing for this architecture
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#endif
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/* This function is necessary to prevent the compiler from
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* generating prologue/epilogue, preparing stack frame etc.
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* The stub functions are special, they do not use the stack
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* frame passed to them, but pass it intact to the actual
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* implementation. On the other hand, asm() statements with
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* arguments can be used only inside the functions (gcc limitation)
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*/
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#if GCC_VERSION < 30400
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static
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#endif /* GCC_VERSION */
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void __attribute__((unused)) dummy(void)
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{
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#include <_exports.h>
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}
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#include <asm/sections.h>
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void app_startup(char * const *argv)
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{
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char *cp = __bss_start;
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/* Zero out BSS */
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while (cp < _end)
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*cp++ = 0;
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#if defined(CONFIG_X86)
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/* x86 does not have a dedicated register for passing global_data */
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global_data = (gd_t *)argv[-1];
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jt = global_data->jt;
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#endif
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}
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#undef EXPORT_FUNC
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