add loongarch64 architecture support

Author: xiaojuanZhai <zhaixiaojuan@loongson.cn>
Author: meidanLi <limeidan@loongson.cn>
Author: guoqiChen <chenguoqi@loongson.cn>
Author: xiaolinZhao <zhaoxiaolin@loongson.cn>
Author: Fanpeng <fanpeng@loongson.cn>
Author: jiantaoShan <shanjiantao@loongson.cn>
Author: xuhuiQiang <qiangxuhui@loongson.cn>
Author: jingyunHua <huajingyun@loongson.cn>

  This port has involved the work of many people. I have tried to
ensure that everyone with substantial contributions have been
credited above; if any omissions are found they will be noted later
in an update to the authors/contributors list in the COPYRIGHT file.

Signed-off-by: zhaixiaojuan <zhaixiaojuan@loongson.cn>

arch/loongarch64/atomic_arch.h

@@ -0,0 +1,52 @@
+#define LLSC_M "m"
+
+#define a_ll a_ll
+static inline int a_ll(volatile int *p)
+{
+	int v;
+	__asm__ __volatile__ (
+		"ll.w %0, %1"
+		: "=r"(v) : LLSC_M(*p));
+	return v;
+}
+
+#define a_sc a_sc
+static inline int a_sc(volatile int *p, int v)
+{
+	int r;
+	__asm__ __volatile__ (
+		"sc.w %0, %1"
+		: "=r"(r), "="LLSC_M(*p) : "0"(v) : "memory");
+	return r;
+}
+
+#define a_ll_p a_ll_p
+static inline void *a_ll_p(volatile void *p)
+{
+	void *v;
+	__asm__ __volatile__ (
+		"ll.d %0, %1"
+		: "=r"(v) : LLSC_M(*(void *volatile *)p));
+	return v;
+}
+
+#define a_sc_p a_sc_p
+static inline int a_sc_p(volatile void *p, void *v)
+{
+	long r;
+	__asm__ __volatile__ (
+		"sc.d %0, %1"
+		: "=r"(r), "="LLSC_M(*(void *volatile *)p) : "0"(v) : "memory");
+	return r;
+}
+
+#define a_barrier a_barrier
+static inline void a_barrier()
+{
+	__asm__ __volatile__ ("dbar 0" : : : "memory");
+}
+
+#define a_pre_llsc a_barrier
+#define a_post_llsc a_barrier
+
+#undef LLSC_M

arch/loongarch64/bits/alltypes.h.in

@@ -0,0 +1,20 @@
+#define _Addr long
+#define _Int64 long
+#define _Reg long
+
+#define __BYTE_ORDER 1234
+#define __LONG_MAX 0x7fffffffffffffffL
+
+TYPEDEF __builtin_va_list va_list;
+TYPEDEF __builtin_va_list __isoc_va_list;
+
+#ifndef __cplusplus
+TYPEDEF int wchar_t;
+#endif
+
+TYPEDEF float float_t;
+TYPEDEF double double_t;
+
+TYPEDEF struct { long long __ll; long double __ld; } max_align_t;
+
+TYPEDEF unsigned nlink_t;

arch/loongarch64/bits/fcntl.h

@@ -0,0 +1,40 @@
+#define O_CREAT        0100
+#define O_EXCL         0200
+#define O_NOCTTY       0400
+#define O_TRUNC       01000
+#define O_APPEND      02000
+#define O_NONBLOCK    04000
+#define O_DSYNC      010000
+#define O_SYNC     04010000
+#define O_RSYNC    04010000
+#define O_DIRECTORY 0200000
+#define O_NOFOLLOW  0400000
+#define O_CLOEXEC  02000000
+
+#define O_ASYNC      020000
+#define O_DIRECT     040000
+#define O_LARGEFILE 0100000
+#define O_NOATIME  01000000
+#define O_PATH    010000000
+#define O_TMPFILE 020000000
+#define O_NDELAY O_NONBLOCK
+
+#define F_DUPFD  0
+#define F_GETFD  1
+#define F_SETFD  2
+#define F_GETFL  3
+#define F_SETFL  4
+
+#define F_SETOWN 8
+#define F_GETOWN 9
+#define F_SETSIG 10
+#define F_GETSIG 11
+
+#define F_GETLK  5
+#define F_SETLK  6
+#define F_SETLKW 7
+
+#define F_SETOWN_EX 15
+#define F_GETOWN_EX 16
+
+#define F_GETOWNER_UIDS 17

arch/loongarch64/bits/fenv.h

@@ -0,0 +1,25 @@
+#ifdef __loongarch_soft_float
+#define FE_ALL_EXCEPT 0
+#define FE_TONEAREST  0
+#else
+#define FE_INEXACT    0x010000
+#define FE_UNDERFLOW  0x020000
+#define FE_OVERFLOW   0x040000
+#define FE_DIVBYZERO  0x080000
+#define FE_INVALID    0x100000
+
+#define FE_ALL_EXCEPT 0x1F0000
+
+#define FE_TONEAREST  0x000
+#define FE_TOWARDZERO 0x100
+#define FE_UPWARD     0x200
+#define FE_DOWNWARD   0x300
+#endif
+
+typedef unsigned fexcept_t;
+
+typedef struct {
+	unsigned __cw;
+} fenv_t;
+
+#define FE_DFL_ENV ((const fenv_t *) -1)

arch/loongarch64/bits/float.h

@@ -0,0 +1,16 @@
+#define FLT_EVAL_METHOD 0
+
+#define LDBL_TRUE_MIN 6.47517511943802511092443895822764655e-4966L
+#define LDBL_MIN 3.36210314311209350626267781732175260e-4932L
+#define LDBL_MAX 1.18973149535723176508575932662800702e+4932L
+#define LDBL_EPSILON 1.92592994438723585305597794258492732e-34L
+
+#define LDBL_MANT_DIG 113
+#define LDBL_MIN_EXP (-16381)
+#define LDBL_MAX_EXP 16384
+
+#define LDBL_DIG 33
+#define LDBL_MIN_10_EXP (-4931)
+#define LDBL_MAX_10_EXP 4932
+
+#define DECIMAL_DIG 36

arch/loongarch64/bits/hwcap.h

@@ -0,0 +1,15 @@
+/* HWCAP - Hardware Capabilities
+ * Hardware information is not clear at present, leave it blank. 
+ */
+#define HWCAP_LOONGARCH_CPUCFG	(1 << 0)
+#define HWCAP_LOONGARCH_FPU	(1 << 1)
+#define HWCAP_LOONGARCH_LSX	(1 << 2)  /* support 128bit vectors*/
+#define HWCAP_LOONGARCH_LASX	(1 << 3)  /* support 256bit vectors*/
+#define HWCAP_LOONGARCH_LBT	(1 << 4)  /* support LBT*/
+#define HWCAP_LOONGARCH_LVZ	(1 << 5)  /* support virtualization expansion*/
+#define HWCAP_LOONGARCH_CRC32	(1 << 7)  /* support CRC32 check*/
+#define HWCAP_LOONGARCH_AES	(1 << 6)
+#define HWCAP_LOONGARCH_SHA1	(1 << 8)
+#define HWCAP_LOONGARCH_SHA2	(1 << 9)
+#define HWCAP_LOONGARCH_SHA3	(1 << 10)
+

arch/loongarch64/bits/posix.h

@@ -0,0 +1,2 @@
+#define _POSIX_V6_LP64_OFF64 1
+#define _POSIX_V7_LP64_OFF64 1

arch/loongarch64/bits/ptrace.h

@@ -0,0 +1,4 @@
+#define PTRACE_GET_THREAD_AREA	25
+#define PTRACE_SET_THREAD_AREA	26
+#define PTRACE_GET_WATCH_REGS	0xd0
+#define PTRACE_SET_WATCH_REGS	0xd1

arch/loongarch64/bits/reg.h

@@ -0,0 +1,66 @@
+#undef __WORDSIZE
+#define __WORDSIZE 64
+#define LOONGARCH64_EF_R0   0
+#define LOONGARCH64_EF_R1   1
+#define LOONGARCH64_EF_R2   2
+#define LOONGARCH64_EF_R3   3
+#define LOONGARCH64_EF_R4   4
+#define LOONGARCH64_EF_R5   5
+#define LOONGARCH64_EF_R6   6
+#define LOONGARCH64_EF_R7   7
+#define LOONGARCH64_EF_R8   8
+#define LOONGARCH64_EF_R9   9
+#define LOONGARCH64_EF_R10    10
+#define LOONGARCH64_EF_R11    11
+#define LOONGARCH64_EF_R12    12
+#define LOONGARCH64_EF_R13    13
+#define LOONGARCH64_EF_R14    14
+#define LOONGARCH64_EF_R15    15
+#define LOONGARCH64_EF_R16    16
+#define LOONGARCH64_EF_R17    17
+#define LOONGARCH64_EF_R18    18
+#define LOONGARCH64_EF_R19    19
+#define LOONGARCH64_EF_R20    20
+#define LOONGARCH64_EF_R21    21
+#define LOONGARCH64_EF_R22    22
+#define LOONGARCH64_EF_R23    23
+#define LOONGARCH64_EF_R24    24
+#define LOONGARCH64_EF_R25    25
+#define LOONGARCH64_EF_R26    26
+#define LOONGARCH64_EF_R27    27
+#define LOONGARCH64_EF_R28    28
+#define LOONGARCH64_EF_R29    29
+#define LOONGARCH64_EF_R30    30
+#define LOONGARCH64_EF_R31    31
+
+#define LOONGARCH64_EF_SIZE   304 /* size in bytes */
+
+#define EF_R0     LOONGARCH64_EF_R0
+#define EF_R1     LOONGARCH64_EF_R1
+#define EF_R2     LOONGARCH64_EF_R2
+#define EF_R3     LOONGARCH64_EF_R3
+#define EF_R4     LOONGARCH64_EF_R4
+#define EF_R5     LOONGARCH64_EF_R5
+#define EF_R6     LOONGARCH64_EF_R6
+#define EF_R7     LOONGARCH64_EF_R7
+#define EF_R8     LOONGARCH64_EF_R8
+#define EF_R9     LOONGARCH64_EF_R9
+#define EF_R10      LOONGARCH64_EF_R10
+#define EF_R11      LOONGARCH64_EF_R11
+#define EF_R12      LOONGARCH64_EF_R12
+#define EF_R13      LOONGARCH64_EF_R13
+#define EF_R14      LOONGARCH64_EF_R14
+#define EF_R15      LOONGARCH64_EF_R15
+#define EF_R16      LOONGARCH64_EF_R16
+#define EF_R17      LOONGARCH64_EF_R17
+#define EF_R18      LOONGARCH64_EF_R18
+#define EF_R19      LOONGARCH64_EF_R19
+#define EF_R20      LOONGARCH64_EF_R20
+#define EF_R21      LOONGARCH64_EF_R21
+#define EF_R22      LOONGARCH64_EF_R22
+#define EF_R23      LOONGARCH64_EF_R23
+#define EF_R24      LOONGARCH64_EF_R24
+#define EF_R25      LOONGARCH64_EF_R25
+#define EF_R26      LOONGARCH64_EF_R26
+#define EF_R27      LOONGARCH64_EF_R27
+#define EF_R28      LOONGARCH64_EF_R28

arch/loongarch64/bits/resource.h

@@ -0,0 +1,5 @@
+#define RLIMIT_NOFILE  7 /* num of file limit, able to open file */
+#define RLIMIT_AS      9 /* address space limit */
+#define RLIMIT_RSS     5 /* max resident set size */
+#define RLIMIT_NPROC   6 /* max number of processes */
+#define RLIMIT_MEMLOCK 8 /* max locked-in-memory address space */

arch/loongarch64/bits/setjmp.h

@@ -0,0 +1 @@
+typedef unsigned long long __jmp_buf[22];