tool headers nolibc: add RISCV support (582e84f7) · Commits · 戴 / test

tools/include/nolibc/nolibc.h

+194 −0

Original line number	Diff line number	Diff line
		@@ -1243,6 +1243,200 @@ struct sys_stat_struct {
		long st_pad4[14];
		};

		#elif defined(__riscv)

		#if __riscv_xlen == 64
		#define PTRLOG "3"
		#define SZREG "8"
		#elif __riscv_xlen == 32
		#define PTRLOG "2"
		#define SZREG "4"
		#endif

		/* Syscalls for RISCV :
		* - stack is 16-byte aligned
		* - syscall number is passed in a7
		* - arguments are in a0, a1, a2, a3, a4, a5
		* - the system call is performed by calling ecall
		* - syscall return comes in a0
		* - the arguments are cast to long and assigned into the target
		* registers which are then simply passed as registers to the asm code,
		* so that we don't have to experience issues with register constraints.
		*/

		#define my_syscall0(num) \
		({ \
		register long _num asm("a7") = (num); \
		register long _arg1 asm("a0"); \
		\
		asm volatile ( \
		"ecall\n\t" \
		: "=r"(_arg1) \
		: "r"(_num) \
		: "memory", "cc" \
		); \
		_arg1; \
		})

		#define my_syscall1(num, arg1) \
		({ \
		register long _num asm("a7") = (num); \
		register long _arg1 asm("a0") = (long)(arg1); \
		\
		asm volatile ( \
		"ecall\n" \
		: "+r"(_arg1) \
		: "r"(_num) \
		: "memory", "cc" \
		); \
		_arg1; \
		})

		#define my_syscall2(num, arg1, arg2) \
		({ \
		register long _num asm("a7") = (num); \
		register long _arg1 asm("a0") = (long)(arg1); \
		register long _arg2 asm("a1") = (long)(arg2); \
		\
		asm volatile ( \
		"ecall\n" \
		: "+r"(_arg1) \
		: "r"(_arg2), \
		"r"(_num) \
		: "memory", "cc" \
		); \
		_arg1; \
		})

		#define my_syscall3(num, arg1, arg2, arg3) \
		({ \
		register long _num asm("a7") = (num); \
		register long _arg1 asm("a0") = (long)(arg1); \
		register long _arg2 asm("a1") = (long)(arg2); \
		register long _arg3 asm("a2") = (long)(arg3); \
		\
		asm volatile ( \
		"ecall\n\t" \
		: "+r"(_arg1) \
		: "r"(_arg2), "r"(_arg3), \
		"r"(_num) \
		: "memory", "cc" \
		); \
		_arg1; \
		})

		#define my_syscall4(num, arg1, arg2, arg3, arg4) \
		({ \
		register long _num asm("a7") = (num); \
		register long _arg1 asm("a0") = (long)(arg1); \
		register long _arg2 asm("a1") = (long)(arg2); \
		register long _arg3 asm("a2") = (long)(arg3); \
		register long _arg4 asm("a3") = (long)(arg4); \
		\
		asm volatile ( \
		"ecall\n" \
		: "+r"(_arg1) \
		: "r"(_arg2), "r"(_arg3), "r"(_arg4), \
		"r"(_num) \
		: "memory", "cc" \
		); \
		_arg1; \
		})

		#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
		({ \
		register long _num asm("a7") = (num); \
		register long _arg1 asm("a0") = (long)(arg1); \
		register long _arg2 asm("a1") = (long)(arg2); \
		register long _arg3 asm("a2") = (long)(arg3); \
		register long _arg4 asm("a3") = (long)(arg4); \
		register long _arg5 asm("a4") = (long)(arg5); \
		\
		asm volatile ( \
		"ecall\n" \
		: "+r"(_arg1) \
		: "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \
		"r"(_num) \
		: "memory", "cc" \
		); \
		_arg1; \
		})

		#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
		({ \
		register long _num asm("a7") = (num); \
		register long _arg1 asm("a0") = (long)(arg1); \
		register long _arg2 asm("a1") = (long)(arg2); \
		register long _arg3 asm("a2") = (long)(arg3); \
		register long _arg4 asm("a3") = (long)(arg4); \
		register long _arg5 asm("a4") = (long)(arg5); \
		register long _arg6 asm("a5") = (long)(arg6); \
		\
		asm volatile ( \
		"ecall\n" \
		: "+r"(_arg1) \
		: "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), "r"(_arg6), \
		"r"(_num) \
		: "memory", "cc" \
		); \
		_arg1; \
		})

		/* startup code */
		asm(".section .text\n"
		".global _start\n"
		"_start:\n"
		".option push\n"
		".option norelax\n"
		"lla gp, __global_pointer$\n"
		".option pop\n"
		"ld a0, 0(sp)\n" // argc (a0) was in the stack
		"add a1, sp, "SZREG"\n" // argv (a1) = sp
		"slli a2, a0, "PTRLOG"\n" // envp (a2) = SZREG*argc ...
		"add a2, a2, "SZREG"\n" // + SZREG (skip null)
		"add a2,a2,a1\n" // + argv
		"andi sp,a1,-16\n" // sp must be 16-byte aligned
		"call main\n" // main() returns the status code, we'll exit with it.
		"andi a0, a0, 0xff\n" // limit exit code to 8 bits
		"li a7, 93\n" // NR_exit == 93
		"ecall\n"
		"");

		/* fcntl / open */
		#define O_RDONLY 0
		#define O_WRONLY 1
		#define O_RDWR 2
		#define O_CREAT 0x100
		#define O_EXCL 0x200
		#define O_NOCTTY 0x400
		#define O_TRUNC 0x1000
		#define O_APPEND 0x2000
		#define O_NONBLOCK 0x4000
		#define O_DIRECTORY 0x200000

		struct sys_stat_struct {
		unsigned long st_dev; /* Device. */
		unsigned long st_ino; /* File serial number. */
		unsigned int st_mode; /* File mode. */
		unsigned int st_nlink; /* Link count. */
		unsigned int st_uid; /* User ID of the file's owner. */
		unsigned int st_gid; /* Group ID of the file's group. */
		unsigned long st_rdev; /* Device number, if device. */
		unsigned long __pad1;
		long st_size; /* Size of file, in bytes. */
		int st_blksize; /* Optimal block size for I/O. */
		int __pad2;
		long st_blocks; /* Number 512-byte blocks allocated. */
		long st_atime; /* Time of last access. */
		unsigned long st_atime_nsec;
		long st_mtime; /* Time of last modification. */
		unsigned long st_mtime_nsec;
		long st_ctime; /* Time of last status change. */
		unsigned long st_ctime_nsec;
		unsigned int __unused4;
		unsigned int __unused5;
		};

		#endif

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