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riscv: support standalone applications on RV64I systems

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Add an implementation of EXPORT_FUNC() for RV64I systems to support them
in standalone applications.

Signed-off-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Lukas Auer 2019-01-04 01:37:33 +01:00 committed by Andes
parent cbb860f2c8
commit 7eb792970e
1 changed files with 11 additions and 0 deletions
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11
examples/standalone/stubs.c
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@ -176,6 +176,16 @@ gd_t *global_data;
/*
* gp holds the pointer to the global_data. t0 is call clobbered.
*/
#ifdef CONFIG_ARCH_RV64I
#define EXPORT_FUNC(f, a, x, ...) \
asm volatile ( \
" .globl " #x "\n" \
#x ":\n" \
" ld t0, %0(gp)\n" \
" ld t0, %1(t0)\n" \
" jr t0\n" \
: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "t0");
#else
#define EXPORT_FUNC(f, a, x, ...) \
asm volatile ( \
" .globl " #x "\n" \
@ -184,6 +194,7 @@ gd_t *global_data;
" lw t0, %1(t0)\n" \
" jr t0\n" \
: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "t0");
#endif
#elif defined(CONFIG_ARC)
/*
* r25 holds the pointer to the global_data. r10 is call clobbered.