[PATCH v5 09/13] LoongArch: Linux ABI
caiyinyu
caiyinyu@loongson.cn
Tue Jun 7 09:32:15 GMT 2022
+static inline ElfW (Addr) __attribute ((always_inline))
+elf_ifunc_invoke (ElfW (Addr) addr)
+{
+ return ((ElfW (Addr) (*) (void)) (addr)) ();
At least for RISCV, sparc, aarch64, powerpc, arm; the ifunc resolver expects
a unsigned long int begin the hardware capability from kernelk (AT_HWCAP).
AArch64 also extends it by passing both uint64_t and a struct with both
AT_HWCAP and AT_HWCAP2. I am not sure if loongarch will ever use more
than the AT_HWCAP.
*Currently ifuncs (like __memchr_ifunc, __memcpy_ifunc ...) are not used
in loongarch, and we will add these in future.*
*or we can add the following patch (now **AT_HWCAP only) though not woking: ****>>>>>>>>>>>*
diff --git a/sysdeps/loongarch/dl-irel.h b/sysdeps/loongarch/dl-irel.h
index 0dfe78c217..ef248095b9 100644
--- a/sysdeps/loongarch/dl-irel.h
+++ b/sysdeps/loongarch/dl-irel.h
@@ -21,13 +21,18 @@
#include <stdio.h>
#include <unistd.h>
+#include <ldsodefs.h>
+#include <sysdep.h>
#define ELF_MACHINE_IRELA 1
static inline ElfW (Addr) __attribute ((always_inline))
elf_ifunc_invoke (ElfW (Addr) addr)
{
- return ((ElfW (Addr) (*) (void)) (addr)) ();
+ /* The second argument is a void pointer to preserve the extension
+ fexibility. */
+ return ((ElfW(Addr) (*) (uint64_t, void *)) (addr))
+ (GLRO(dl_hwcap), NULL);
}
static inline void __attribute ((always_inline))
*<<<<<<<<<<<<<<<<<<*
在 2022/6/7 上午2:36, Adhemerval Zanella 写道:
> On 31/05/2022 23:18, caiyinyu wrote:
>> ---
>> sysdeps/loongarch/dl-irel.h | 48 +++++++++
>> sysdeps/loongarch/nptl/pthreaddef.h | 32 ++++++
>> .../unix/sysv/linux/loongarch/bits/fcntl.h | 61 +++++++++++
>> .../unix/sysv/linux/loongarch/bits/procfs.h | 52 +++++++++
>> .../linux/loongarch/bits/pthread_stack_min.h | 20 ++++
>> .../unix/sysv/linux/loongarch/bits/sigstack.h | 32 ++++++
>> .../unix/sysv/linux/loongarch/getcontext.S | 59 +++++++++++
>> .../unix/sysv/linux/loongarch/localplt.data | 12 +++
>> .../unix/sysv/linux/loongarch/makecontext.c | 79 ++++++++++++++
>> .../unix/sysv/linux/loongarch/setcontext.S | 100 ++++++++++++++++++
>> .../sysv/linux/loongarch/sigcontextinfo.h | 32 ++++++
>> .../unix/sysv/linux/loongarch/swapcontext.S | 95 +++++++++++++++++
>> .../unix/sysv/linux/loongarch/sys/ucontext.h | 61 +++++++++++
>> sysdeps/unix/sysv/linux/loongarch/sys/user.h | 42 ++++++++
>> .../sysv/linux/loongarch/ucontext-macros.h | 32 ++++++
>> .../unix/sysv/linux/loongarch/ucontext_i.sym | 31 ++++++
>> 16 files changed, 788 insertions(+)
>> create mode 100644 sysdeps/loongarch/dl-irel.h
>> create mode 100644 sysdeps/loongarch/nptl/pthreaddef.h
>> create mode 100644 sysdeps/unix/sysv/linux/loongarch/bits/fcntl.h
>> create mode 100644 sysdeps/unix/sysv/linux/loongarch/bits/procfs.h
>> create mode 100644 sysdeps/unix/sysv/linux/loongarch/bits/pthread_stack_min.h
>> create mode 100644 sysdeps/unix/sysv/linux/loongarch/bits/sigstack.h
>> create mode 100644 sysdeps/unix/sysv/linux/loongarch/getcontext.S
>> create mode 100644 sysdeps/unix/sysv/linux/loongarch/localplt.data
>> create mode 100644 sysdeps/unix/sysv/linux/loongarch/makecontext.c
>> create mode 100644 sysdeps/unix/sysv/linux/loongarch/setcontext.S
>> create mode 100644 sysdeps/unix/sysv/linux/loongarch/sigcontextinfo.h
>> create mode 100644 sysdeps/unix/sysv/linux/loongarch/swapcontext.S
>> create mode 100644 sysdeps/unix/sysv/linux/loongarch/sys/ucontext.h
>> create mode 100644 sysdeps/unix/sysv/linux/loongarch/sys/user.h
>> create mode 100644 sysdeps/unix/sysv/linux/loongarch/ucontext-macros.h
>> create mode 100644 sysdeps/unix/sysv/linux/loongarch/ucontext_i.sym
>>
>> diff --git a/sysdeps/loongarch/dl-irel.h b/sysdeps/loongarch/dl-irel.h
>> new file mode 100644
>> index 0000000000..c94cba702a
>> --- /dev/null
>> +++ b/sysdeps/loongarch/dl-irel.h
>> @@ -0,0 +1,48 @@
>> +/* Machine-dependent ELF indirect relocation inline functions.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library; if not, see
>> +<https://www.gnu.org/licenses/>. */
>> +
>> +#ifndef _DL_IREL_H
>> +#define _DL_IREL_H
>> +
>> +#include <stdio.h>
>> +#include <unistd.h>
>> +
>> +#define ELF_MACHINE_IRELA 1
>> +
>> +static inline ElfW (Addr) __attribute ((always_inline))
>> +elf_ifunc_invoke (ElfW (Addr) addr)
>> +{
>> + return ((ElfW (Addr) (*) (void)) (addr)) ();
> At least for RISCV, sparc, aarch64, powerpc, arm; the ifunc resolver expects
> a unsigned long int begin the hardware capability from kernelk (AT_HWCAP).
>
> AArch64 also extends it by passing both uint64_t and a struct with both
> AT_HWCAP and AT_HWCAP2. I am not sure if loongarch will ever use more
> than the AT_HWCAP.
>
>> +}
>> +
>> +static inline void __attribute ((always_inline))
>> +elf_irela (const ElfW (Rela) * reloc)
>> +{
>> + ElfW (Addr) *const reloc_addr = (void *) reloc->r_offset;
>> + const unsigned long int r_type = ELFW (R_TYPE) (reloc->r_info);
>> +
>> + if (__glibc_likely (r_type == R_LARCH_IRELATIVE))
>> + {
>> + ElfW (Addr) value = elf_ifunc_invoke (reloc->r_addend);
>> + *reloc_addr = value;
>> + }
>> + else
>> + __libc_fatal ("Unexpected reloc type in static binary.\n");
>> +}
>> +
>> +#endif /* dl-irel.h */
>> diff --git a/sysdeps/loongarch/nptl/pthreaddef.h b/sysdeps/loongarch/nptl/pthreaddef.h
>> new file mode 100644
>> index 0000000000..955566cddc
>> --- /dev/null
>> +++ b/sysdeps/loongarch/nptl/pthreaddef.h
>> @@ -0,0 +1,32 @@
>> +/* pthread machine parameter definitions.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> +<https://www.gnu.org/licenses/>. */
>> +
>> +/* Default stack size. */
>> +#define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024)
>> +
>> +/* Minimum guard size. */
>> +#define ARCH_MIN_GUARD_SIZE 0
>> +
>> +/* Required stack pointer alignment at beginning. */
>> +#define STACK_ALIGN 16
>> +
>> +/* Minimal stack size after allocating thread descriptor and guard size. */
>> +#define MINIMAL_REST_STACK 2048
>> +
>> +/* Location of current stack frame. */
>> +#define CURRENT_STACK_FRAME __builtin_frame_address (0)
>> diff --git a/sysdeps/unix/sysv/linux/loongarch/bits/fcntl.h b/sysdeps/unix/sysv/linux/loongarch/bits/fcntl.h
>> new file mode 100644
>> index 0000000000..bf1e254234
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/loongarch/bits/fcntl.h
>> @@ -0,0 +1,61 @@
>> +/* O_*, F_*, FD_* bit values for the generic Linux/LoongArch ABI.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> +<https://www.gnu.org/licenses/>. */
>> +
>> +#ifndef _FCNTL_H
>> +#error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
>> +#endif
>> +
>> +#include <bits/wordsize.h>
>> +
>> +/* In 64-bit ISA files are always with 64bit off_t and F_*LK64 are the same as
>> + non-64-bit versions. It will need to be revised for 128-bit. */
>> +#if __WORDSIZE == 64
>> +#define __O_LARGEFILE 0
>> +
>> +#define F_GETLK64 5 /* Get record locking info. */
>> +#define F_SETLK64 6 /* Set record locking info (non-blocking). */
>> +#define F_SETLKW64 7 /* Set record locking info (blocking). */
>> +#endif
>> +
>> +struct flock
>> +{
>> + short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
>> + short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
>> +#ifndef __USE_FILE_OFFSET64
>> + __off_t l_start; /* Offset where the lock begins. */
>> + __off_t l_len; /* Size of the locked area; zero means until EOF. */
>> +#else
>> + __off64_t l_start; /* Offset where the lock begins. */
>> + __off64_t l_len; /* Size of the locked area; zero means until EOF. */
>> +#endif
>> + __pid_t l_pid; /* Process holding the lock. */
>> +};
>> +
>> +#ifdef __USE_LARGEFILE64
>> +struct flock64
>> +{
>> + short int l_type; /* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK. */
>> + short int l_whence; /* Where `l_start' is relative to (like `lseek'). */
>> + __off64_t l_start; /* Offset where the lock begins. */
>> + __off64_t l_len; /* Size of the locked area; zero means until EOF. */
>> + __pid_t l_pid; /* Process holding the lock. */
>> +};
>> +#endif
>> +
>> +/* Include generic Linux declarations. */
>> +#include <bits/fcntl-linux.h>
>> diff --git a/sysdeps/unix/sysv/linux/loongarch/bits/procfs.h b/sysdeps/unix/sysv/linux/loongarch/bits/procfs.h
>> new file mode 100644
>> index 0000000000..2db777b38c
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/loongarch/bits/procfs.h
>> @@ -0,0 +1,52 @@
>> +/* Types for registers for sys/procfs.h.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> +
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> +<https://www.gnu.org/licenses/>. */
>> +
>> +#ifndef _SYS_PROCFS_H
>> +# error "Never include <bits/procfs.h> directly; use <sys/procfs.h> instead."
>> +#endif
>> +
>> +/* Type for a general-purpose register. */
>> +typedef __uint64_t elf_greg_t;
>> +
>> +/* And the whole bunch of them. We could have used `struct
>> + pt_regs' directly in the typedef, but tradition says that
>> + the register set is an array, which does have some peculiar
>> + semantics, so leave it that way. */
>> +#define ELF_NGREG (sizeof (struct user_regs_struct) / sizeof (elf_greg_t))
>> +typedef elf_greg_t elf_gregset_t[ELF_NGREG];
>> +
>> +#define ELF_NFPREG 34 /* 32 FPRs + 8-byte byte-vec for fcc + 4-byte FCR */
>> +typedef union
>> +{
>> + double d;
>> + float f;
>> +} elf_fpreg_t;
>> +typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
>> +
>> +typedef union
>> +{
>> + double d[2];
>> + float f[4];
>> +} __attribute__ ((__aligned__ (16))) elf_lsxregset_t[32];
>> +
>> +typedef union
>> +{
>> + double d[4];
>> + float f[8];
>> +} __attribute__ ((__aligned__ (32))) elf_lasxregset_t[32];
>> diff --git a/sysdeps/unix/sysv/linux/loongarch/bits/pthread_stack_min.h b/sysdeps/unix/sysv/linux/loongarch/bits/pthread_stack_min.h
>> new file mode 100644
>> index 0000000000..072c2ade42
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/loongarch/bits/pthread_stack_min.h
>> @@ -0,0 +1,20 @@
>> +/* Definition of PTHREAD_STACK_MIN. LoongArch Linux version.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public License as
>> + published by the Free Software Foundation; either version 2.1 of the
>> + License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> +<https://www.gnu.org/licenses/>. */
>> +
>> +/* Minimum size for a thread. At least two pages with 64k pages. */
>> +#define PTHREAD_STACK_MIN 131072
>> diff --git a/sysdeps/unix/sysv/linux/loongarch/bits/sigstack.h b/sysdeps/unix/sysv/linux/loongarch/bits/sigstack.h
>> new file mode 100644
>> index 0000000000..238c1a98e6
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/loongarch/bits/sigstack.h
>> @@ -0,0 +1,32 @@
>> +/* sigstack, sigaltstack definitions.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library; if not, see
>> +<https://www.gnu.org/licenses/>. */
>> +
>> +#ifndef _BITS_SIGSTACK_H
>> +#define _BITS_SIGSTACK_H 1
>> +
>> +#if !defined _SIGNAL_H && !defined _SYS_UCONTEXT_H
>> +# error "Never include this file directly. Use <signal.h> instead"
>> +#endif
>> +
>> +/* Minimum stack size for a signal handler. */
>> +#define MINSIGSTKSZ 4096
>> +
>> +/* System default stack size. */
>> +#define SIGSTKSZ 16384
>> +
>> +#endif /* bits/sigstack.h */
>> diff --git a/sysdeps/unix/sysv/linux/loongarch/getcontext.S b/sysdeps/unix/sysv/linux/loongarch/getcontext.S
>> new file mode 100644
>> index 0000000000..43b95e9715
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/loongarch/getcontext.S
>> @@ -0,0 +1,59 @@
>> +/* Save current context.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> +<https://www.gnu.org/licenses/>. */
>> +
>> +#include "ucontext-macros.h"
>> +
>> +/* int getcontext (ucontext_t *ucp) */
>> +
>> + .text
>> +LEAF (__getcontext)
>> + SAVE_INT_REG (ra, 1, a0)
>> + SAVE_INT_REG (sp, 3, a0)
>> + SAVE_INT_REG (zero, 4, a0) /* return 0 by overwriting a0. */
>> + SAVE_INT_REG (x, 21, a0)
>> + SAVE_INT_REG (fp, 22, a0)
>> + SAVE_INT_REG (s0, 23, a0)
>> + SAVE_INT_REG (s1, 24, a0)
>> + SAVE_INT_REG (s2, 25, a0)
>> + SAVE_INT_REG (s3, 26, a0)
>> + SAVE_INT_REG (s4, 27, a0)
>> + SAVE_INT_REG (s5, 28, a0)
>> + SAVE_INT_REG (s6, 29, a0)
>> + SAVE_INT_REG (s7, 30, a0)
>> + SAVE_INT_REG (s8, 31, a0)
>> + st.d ra, a0, MCONTEXT_PC
>> +
>> +/* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */
>> + li.d a3, _NSIG8
>> + li.d a2, UCONTEXT_SIGMASK
>> + add.d a2, a2, a0
>> + ori a1, zero,0
>> + li.d a0, SIG_BLOCK
>> +
>> + li.d a7, SYS_ify (rt_sigprocmask)
>> + syscall 0
>> + blt a0, zero, 99f
>> +
>> + jirl $r0, $r1, 0
>> +
>> +99:
>> + b __syscall_error
>> +
>> +PSEUDO_END (__getcontext)
>> +
>> +weak_alias (__getcontext, getcontext)
>> diff --git a/sysdeps/unix/sysv/linux/loongarch/localplt.data b/sysdeps/unix/sysv/linux/loongarch/localplt.data
>> new file mode 100644
>> index 0000000000..817ab2659a
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/loongarch/localplt.data
>> @@ -0,0 +1,12 @@
>> +# See scripts/check-localplt.awk for how this file is processed.
>> +# PLT use is required for the malloc family and for matherr because
>> +# users can define their own functions and have library internals call them.
>> +libc.so: calloc
>> +libc.so: free
>> +libc.so: malloc
>> +libc.so: realloc
>> +# The TLS-enabled version of these functions is interposed from libc.so.
>> +ld.so: _dl_signal_error
>> +ld.so: _dl_catch_error
>> +ld.so: _dl_signal_exception
>> +ld.so: _dl_catch_exception
>> diff --git a/sysdeps/unix/sysv/linux/loongarch/makecontext.c b/sysdeps/unix/sysv/linux/loongarch/makecontext.c
>> new file mode 100644
>> index 0000000000..d29c8056cb
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/loongarch/makecontext.c
>> @@ -0,0 +1,79 @@
>> +/* Create new context.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> +
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> +<https://www.gnu.org/licenses/>. */
>> +
>> +#include <sysdep.h>
>> +#include <sys/asm.h>
>> +#include <sys/ucontext.h>
>> +#include <stdarg.h>
>> +#include <assert.h>
>> +
>> +void
>> +__makecontext (ucontext_t *ucp, void (*func) (void), int argc, long int a0,
>> + long int a1, long int a2, long int a3, long int a4, ...)
>> +{
>> + extern void __start_context (void) attribute_hidden;
>> + long int i, sp;
>> +
>> + _Static_assert(LARCH_REG_NARGS == 8,
>> + "__makecontext assumes 8 argument registers");
>> +
>> + /* Set up the stack. */
>> + sp = ((long int) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size) & ALMASK;
>> +
>> + /* Set up the register context.
>> + ra = s0 = 0, terminating the stack for backtracing purposes.
>> + s1 = the function we must call.
>> + s2 = the subsequent context to run. */
>> + ucp->uc_mcontext.__gregs[LARCH_REG_RA] = 0;
>> + ucp->uc_mcontext.__gregs[LARCH_REG_S0] = 0;
>> + ucp->uc_mcontext.__gregs[LARCH_REG_S1] = (long int) func;
>> + ucp->uc_mcontext.__gregs[LARCH_REG_S2] = (long int) ucp->uc_link;
>> + ucp->uc_mcontext.__gregs[LARCH_REG_SP] = sp;
>> + ucp->uc_mcontext.__pc = (long int) &__start_context;
>> +
>> + /* Put args in a0-a7, then put any remaining args on the stack. */
>> + ucp->uc_mcontext.__gregs[LARCH_REG_A0 + 0] = a0;
>> + ucp->uc_mcontext.__gregs[LARCH_REG_A0 + 1] = a1;
>> + ucp->uc_mcontext.__gregs[LARCH_REG_A0 + 2] = a2;
>> + ucp->uc_mcontext.__gregs[LARCH_REG_A0 + 3] = a3;
>> + ucp->uc_mcontext.__gregs[LARCH_REG_A0 + 4] = a4;
>> +
>> + if (__glibc_unlikely (argc > 5))
>> + {
>> + va_list vl;
>> + va_start (vl, a4);
>> +
>> + long reg_args = argc < LARCH_REG_NARGS ? argc : LARCH_REG_NARGS;
>> + for (i = 5; i < reg_args; i++)
>> + ucp->uc_mcontext.__gregs[LARCH_REG_A0 + i] = va_arg (vl, long);
>> +
>> + long int stack_args = argc - reg_args;
>> + if (stack_args > 0)
>> + {
>> + sp = (sp - stack_args * sizeof (long int)) & ALMASK;
>> + ucp->uc_mcontext.__gregs[LARCH_REG_SP] = sp;
>> + for (i = 0; i < stack_args; i++)
>> + ((long int *) sp)[i] = va_arg (vl, long int);
>> + }
>> +
>> + va_end (vl);
>> + }
>> +}
>> +
>> +weak_alias (__makecontext, makecontext)
>> diff --git a/sysdeps/unix/sysv/linux/loongarch/setcontext.S b/sysdeps/unix/sysv/linux/loongarch/setcontext.S
>> new file mode 100644
>> index 0000000000..a1216dad69
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/loongarch/setcontext.S
>> @@ -0,0 +1,100 @@
>> +/* Set current context.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> +<https://www.gnu.org/licenses/>. */
>> +#include "sys/regdef.h"
>> +#include "ucontext-macros.h"
>> +
>> +/* int __setcontext (const ucontext_t *ucp)
>> +
>> + Restores the machine context in UCP and thereby resumes execution
>> + in that context.
>> +
>> + This implementation is intended to be used for *synchronous* context
>> + switches only. Therefore, it does not have to restore anything
>> + other than the PRESERVED state. */
>> +
>> + .text
>> +LEAF (__setcontext)
>> +
>> + addi.d sp, sp, -16
>> + st.d a0, sp, 0 /* Save ucp to stack */
>> +
>> +/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */
>> + li.d a3, _NSIG8
>> + li.d a2, 0
>> + li.d a1, UCONTEXT_SIGMASK
>> + add.d a1, a1, a0
>> + li.d a0, SIG_SETMASK
>> +
>> + li.d a7, SYS_ify (rt_sigprocmask)
>> + syscall 0
>> +
>> + blt a0, $r0, 99f
>> +
>> + ld.d t0, sp, 0 /* Load ucp to t0 */
>> + cfi_def_cfa (12, 0)
>> +
>> +/* Note the contents of argument registers will be random
>> + unless makecontext() has been called. */
>> + RESTORE_INT_REG(ra, 1, t0)
>> + RESTORE_INT_REG(sp, 3, t0)
>> + RESTORE_INT_REG(a0, 4, t0)
>> + RESTORE_INT_REG(a1, 5, t0)
>> + RESTORE_INT_REG(a2, 6, t0)
>> + RESTORE_INT_REG(a3, 7, t0)
>> + RESTORE_INT_REG(a4, 8, t0)
>> + RESTORE_INT_REG(a5, 9, t0)
>> + RESTORE_INT_REG(a6, 10, t0)
>> + RESTORE_INT_REG(a7, 11, t0)
>> + RESTORE_INT_REG(x, 21, t0)
>> + RESTORE_INT_REG(fp, 22, t0)
>> + RESTORE_INT_REG(s0, 23, t0)
>> + RESTORE_INT_REG(s1, 24, t0)
>> + RESTORE_INT_REG(s2, 25, t0)
>> + RESTORE_INT_REG(s3, 26, t0)
>> + RESTORE_INT_REG(s4, 27, t0)
>> + RESTORE_INT_REG(s5, 28, t0)
>> + RESTORE_INT_REG(s6, 29, t0)
>> + RESTORE_INT_REG(s7, 30, t0)
>> + RESTORE_INT_REG(s8, 31, t0)
>> +
>> + ld.d t1, t0, MCONTEXT_PC
>> + jirl $r0,t1,0
>> +
>> +99:
>> + addi.d sp, sp, 16
>> + b __syscall_error
>> +
>> +PSEUDO_END (__setcontext)
>> +weak_alias (__setcontext, setcontext)
>> +
>> +LEAF (__start_context)
>> +
>> + /* Terminate call stack by noting ra == 0. Happily, s0 == 0 here. */
>> + cfi_register (1, 23)
>> +
>> + /* Call the function passed to makecontext. */
>> + jirl $r1,s1,0
>> +
>> + /* Invoke subsequent context if present, else exit(0). */
>> + ori a0, s2, 0
>> + beqz s2, 1f
>> + bl __setcontext
>> +1:
>> + b exit
>> +
>> +PSEUDO_END (__start_context)
>> diff --git a/sysdeps/unix/sysv/linux/loongarch/sigcontextinfo.h b/sysdeps/unix/sysv/linux/loongarch/sigcontextinfo.h
>> new file mode 100644
>> index 0000000000..5e202bc0b4
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/loongarch/sigcontextinfo.h
>> @@ -0,0 +1,32 @@
>> +/* LoongArch definitions for signal handling calling conventions.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> +
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> +<https://www.gnu.org/licenses/>. */
>> +
>> +#ifndef _SIGCONTEXTINFO_H
>> +#define _SIGCONTEXTINFO_H
>> +
>> +#include <stdint.h>
>> +#include <sys/ucontext.h>
>> +
>> +static inline uintptr_t
>> +sigcontext_get_pc (const ucontext_t *ctx)
>> +{
>> + return ctx->uc_mcontext.__pc;
>> +}
>> +
>> +#endif
>> diff --git a/sysdeps/unix/sysv/linux/loongarch/swapcontext.S b/sysdeps/unix/sysv/linux/loongarch/swapcontext.S
>> new file mode 100644
>> index 0000000000..bb22cd2f00
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/loongarch/swapcontext.S
>> @@ -0,0 +1,95 @@
>> +/* Save and set current context.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> +<https://www.gnu.org/licenses/>. */
>> +
>> +#include "ucontext-macros.h"
>> +
>> +/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
>> +
>> +LEAF (__swapcontext)
>> + ori a2, sp, 0 /* Save sp to a2 */
>> + addi.d sp, sp, -16
>> + st.d a1, sp, 0
>> + ori t0, a1, 0
>> +
>> + SAVE_INT_REG (ra, 1, a0)
>> + SAVE_INT_REG (a2, 3, a0) /* Store sp */
>> + SAVE_INT_REG (zero, 4, a0) /* return 0 by overwriting a0 */
>> + SAVE_INT_REG (x, 21, a0)
>> + SAVE_INT_REG (fp, 22, a0)
>> + SAVE_INT_REG (s0, 23, a0)
>> + SAVE_INT_REG (s1, 24, a0)
>> + SAVE_INT_REG (s2, 25, a0)
>> + SAVE_INT_REG (s3, 26, a0)
>> + SAVE_INT_REG (s4, 27, a0)
>> + SAVE_INT_REG (s5, 28, a0)
>> + SAVE_INT_REG (s6, 29, a0)
>> + SAVE_INT_REG (s7, 30, a0)
>> + SAVE_INT_REG (s8, 31, a0)
>> +
>> + st.d ra, a0, MCONTEXT_PC
>> +
>> +/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, _NSIG8) */
>> + li.d a3, _NSIG8
>> + li.d a2, UCONTEXT_SIGMASK
>> + add.d a2, a2, a0
>> + li.d a1, UCONTEXT_SIGMASK
>> + add.d a1, a1, t0
>> + li.d a0, SIG_SETMASK
>> +
>> + li.d a7, SYS_ify (rt_sigprocmask)
>> + syscall 0
>> +
>> + blt a0, zero, 99f
>> +
>> + ld.d t0, sp, 0 /* Load a1 to t0 */
>> +
>> +/* Note the contents of argument registers will be random
>> + unless makecontext() has been called. */
>> + RESTORE_INT_REG (ra, 1, t0)
>> + RESTORE_INT_REG (sp, 3, t0)
>> + RESTORE_INT_REG (a0, 4, t0)
>> + RESTORE_INT_REG (a1, 5, t0)
>> + RESTORE_INT_REG (a2, 6, t0)
>> + RESTORE_INT_REG (a3, 7, t0)
>> + RESTORE_INT_REG (a4, 8, t0)
>> + RESTORE_INT_REG (a5, 9, t0)
>> + RESTORE_INT_REG (a6, 10, t0)
>> + RESTORE_INT_REG (a7, 11, t0)
>> + RESTORE_INT_REG (x, 21, t0)
>> + RESTORE_INT_REG (fp, 22, t0)
>> + RESTORE_INT_REG (s0, 23, t0)
>> + RESTORE_INT_REG (s1, 24, t0)
>> + RESTORE_INT_REG (s2, 25, t0)
>> + RESTORE_INT_REG (s3, 26, t0)
>> + RESTORE_INT_REG (s4, 27, t0)
>> + RESTORE_INT_REG (s5, 28, t0)
>> + RESTORE_INT_REG (s6, 29, t0)
>> + RESTORE_INT_REG (s7, 30, t0)
>> + RESTORE_INT_REG (s8, 31, t0)
>> +
>> + ld.d t1, t0, MCONTEXT_PC
>> + jirl $r0, t1, 0
>> +
>> +
>> +99:
>> + addi.d sp, sp, 16
>> + b __syscall_error
>> +
>> +PSEUDO_END (__swapcontext)
>> +
>> +weak_alias (__swapcontext, swapcontext)
>> diff --git a/sysdeps/unix/sysv/linux/loongarch/sys/ucontext.h b/sysdeps/unix/sysv/linux/loongarch/sys/ucontext.h
>> new file mode 100644
>> index 0000000000..e334a45a44
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/loongarch/sys/ucontext.h
>> @@ -0,0 +1,61 @@
>> +/* struct ucontext definition.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> +
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> +<https://www.gnu.org/licenses/>. */
>> +
>> +/* Don't rely on this, the interface is currently messed up and may need to
>> + be broken to be fixed. */
>> +#ifndef _SYS_UCONTEXT_H
>> +#define _SYS_UCONTEXT_H 1
>> +
>> +#include <features.h>
>> +
>> +#include <bits/types/sigset_t.h>
>> +#include <bits/types/stack_t.h>
>> +
>> +#ifdef __USE_MISC
>> +#define LARCH_NGREG 32
>> +
>> +#define LARCH_REG_RA 1
>> +#define LARCH_REG_SP 3
>> +#define LARCH_REG_S0 23
>> +#define LARCH_REG_S1 24
>> +#define LARCH_REG_A0 4
>> +#define LARCH_REG_S2 25
>> +#define LARCH_REG_NARGS 8
>> +
>> +#endif
>> +
>> +typedef struct mcontext_t
>> +{
>> + unsigned long long __pc;
>> + unsigned long long __gregs[32];
>> + unsigned int __flags;
>> + unsigned long long __extcontext[0] __attribute__((__aligned__(16)));
>> +} mcontext_t;
>> +
>> +/* Userlevel context. */
>> +typedef struct ucontext_t
>> +{
>> + unsigned long int __uc_flags;
>> + struct ucontext_t *uc_link;
>> + stack_t uc_stack;
>> + sigset_t uc_sigmask;
>> + mcontext_t uc_mcontext;
>> +} ucontext_t;
>> +
>> +#endif /* sys/ucontext.h */
>> diff --git a/sysdeps/unix/sysv/linux/loongarch/sys/user.h b/sysdeps/unix/sysv/linux/loongarch/sys/user.h
>> new file mode 100644
>> index 0000000000..55181de816
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/loongarch/sys/user.h
>> @@ -0,0 +1,42 @@
>> +/* struct user_regs_struct definition for LoongArch.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library; if not, see
>> +<https://www.gnu.org/licenses/>. */
>> +
>> +#ifndef _SYS_USER_H
>> +#define _SYS_USER_H 1
>> +
>> +#include <stdint.h>
>> +
>> +struct user_regs_struct
>> +{
>> + /* Saved main processor registers. */
>> + uint64_t regs[32];
>> +
>> + /* Saved special registers. */
>> + uint64_t orig_a0;
>> + uint64_t csr_era;
>> + uint64_t csr_badv;
>> + uint64_t reserved[10];
>> +};
>> +
>> +struct user_fp_struct {
>> + uint64_t fpr[32];
>> + uint64_t fcc;
>> + uint32_t fcsr;
>> +};
>> +
>> +#endif /* _SYS_USER_H */
>> diff --git a/sysdeps/unix/sysv/linux/loongarch/ucontext-macros.h b/sysdeps/unix/sysv/linux/loongarch/ucontext-macros.h
>> new file mode 100644
>> index 0000000000..859eba464b
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/loongarch/ucontext-macros.h
>> @@ -0,0 +1,32 @@
>> +/* Macros for ucontext routines.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> +<https://www.gnu.org/licenses/>. */
>> +
>> +#ifndef _LINUX_LOONGARCH_UCONTEXT_MACROS_H
>> +#define _LINUX_LOONGARCH_UCONTEXT_MACROS_H
>> +
>> +#include <sysdep.h>
>> +#include <sys/asm.h>
>> +#include "ucontext_i.h"
>> +
>> +#define SAVE_INT_REG(name, num, base) \
>> + REG_S name, base, ((num) *SZREG + MCONTEXT_GREGS)
>> +
>> +#define RESTORE_INT_REG(name, num, base) \
>> + REG_L name, base, ((num) *SZREG + MCONTEXT_GREGS)
>> +
>> +#endif /* _LINUX_LOONGARCH_UCONTEXT_MACROS_H */
>> diff --git a/sysdeps/unix/sysv/linux/loongarch/ucontext_i.sym b/sysdeps/unix/sysv/linux/loongarch/ucontext_i.sym
>> new file mode 100644
>> index 0000000000..f27afad56f
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/loongarch/ucontext_i.sym
>> @@ -0,0 +1,31 @@
>> +#include <inttypes.h>
>> +#include <signal.h>
>> +#include <stddef.h>
>> +#include <sys/ucontext.h>
>> +
>> +-- Constants used by the rt_sigprocmask call.
>> +
>> +SIG_BLOCK
>> +SIG_SETMASK
>> +
>> +_NSIG8 (_NSIG / 8)
>> +
>> +-- Offsets of the fields in the ucontext_t structure.
>> +#define ucontext(member) offsetof (ucontext_t, member)
>> +#define stack(member) ucontext (uc_stack.member)
>> +#define mcontext(member) ucontext (uc_mcontext.member)
>> +
>> +UCONTEXT_FLAGS ucontext (__uc_flags)
>> +UCONTEXT_LINK ucontext (uc_link)
>> +UCONTEXT_STACK ucontext (uc_stack)
>> +UCONTEXT_MCONTEXT ucontext (uc_mcontext)
>> +UCONTEXT_SIGMASK ucontext (uc_sigmask)
>> +
>> +STACK_SP stack (ss_sp)
>> +STACK_SIZE stack (ss_size)
>> +STACK_FLAGS stack (ss_flags)
>> +
>> +MCONTEXT_PC mcontext (__pc)
>> +MCONTEXT_GREGS mcontext (__gregs)
>> +
>> +UCONTEXT_SIZE sizeof (ucontext_t)
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