52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
#include <exports.h>
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#ifndef GCC_VERSION
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#define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
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#endif /* GCC_VERSION */
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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(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"(XF_ ## x * sizeof(void *)) : "t9");
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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 < 3004
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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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#if 0
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extern unsigned long __bss_start, _end;
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void app_startup(char **argv)
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{
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unsigned long * 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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}
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}
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#endif
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#undef EXPORT_FUNC
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