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riscv64: add system call definitions #1615

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Oct 20, 2023
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riscv64: add system call definitions #1615

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86 changes: 86 additions & 0 deletions arch/arch-riscv64.h
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Original file line number Diff line number Diff line change
Expand Up @@ -29,4 +29,90 @@ static inline int arch_init(char *envp[])
return 0;
}

#define __do_syscallM(...) ({ \
__asm__ volatile ( \
"ecall" \
: "=r"(a0) \
: __VA_ARGS__ \
: "memory", "a1"); \
(long) a0; \
})

#define __do_syscallN(...) ({ \
__asm__ volatile ( \
"ecall" \
: "=r"(a0) \
: __VA_ARGS__ \
: "memory"); \
(long) a0; \
})

#define __do_syscall0(__n) ({ \
register long a7 __asm__("a7") = __n; \
register long a0 __asm__("a0"); \
\
__do_syscallM("r" (a7)); \
})

#define __do_syscall1(__n, __a) ({ \
register long a7 __asm__("a7") = __n; \
register __typeof__(__a) a0 __asm__("a0") = __a; \
\
__do_syscallM("r" (a7), "0" (a0)); \
})

#define __do_syscall2(__n, __a, __b) ({ \
register long a7 __asm__("a7") = __n; \
register __typeof__(__a) a0 __asm__("a0") = __a; \
register __typeof__(__b) a1 __asm__("a1") = __b; \
\
__do_syscallN("r" (a7), "0" (a0), "r" (a1)); \
})

#define __do_syscall3(__n, __a, __b, __c) ({ \
register long a7 __asm__("a7") = __n; \
register __typeof__(__a) a0 __asm__("a0") = __a; \
register __typeof__(__b) a1 __asm__("a1") = __b; \
register __typeof__(__c) a2 __asm__("a2") = __c; \
\
__do_syscallN("r" (a7), "0" (a0), "r" (a1), "r" (a2)); \
})

#define __do_syscall4(__n, __a, __b, __c, __d) ({ \
register long a7 __asm__("a7") = __n; \
register __typeof__(__a) a0 __asm__("a0") = __a; \
register __typeof__(__b) a1 __asm__("a1") = __b; \
register __typeof__(__c) a2 __asm__("a2") = __c; \
register __typeof__(__d) a3 __asm__("a3") = __d; \
\
__do_syscallN("r" (a7), "0" (a0), "r" (a1), "r" (a2), "r" (a3));\
})

#define __do_syscall5(__n, __a, __b, __c, __d, __e) ({ \
register long a7 __asm__("a7") = __n; \
register __typeof__(__a) a0 __asm__("a0") = __a; \
register __typeof__(__b) a1 __asm__("a1") = __b; \
register __typeof__(__c) a2 __asm__("a2") = __c; \
register __typeof__(__d) a3 __asm__("a3") = __d; \
register __typeof__(__e) a4 __asm__("a4") = __e; \
\
__do_syscallN("r" (a7), "0" (a0), "r" (a1), "r" (a2), "r" (a3), \
"r"(a4)); \
})

#define __do_syscall6(__n, __a, __b, __c, __d, __e, __f) ({ \
register long a7 __asm__("a7") = __n; \
register __typeof__(__a) a0 __asm__("a0") = __a; \
register __typeof__(__b) a1 __asm__("a1") = __b; \
register __typeof__(__c) a2 __asm__("a2") = __c; \
register __typeof__(__d) a3 __asm__("a3") = __d; \
register __typeof__(__e) a4 __asm__("a4") = __e; \
register __typeof__(__f) a5 __asm__("a5") = __f; \
\
__do_syscallN("r" (a7), "0" (a0), "r" (a1), "r" (a2), "r" (a3), \
"r" (a4), "r"(a5)); \
})

#define FIO_ARCH_HAS_SYSCALL

#endif