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-rw-r--r--libc/sysdeps/linux/xtensa/Makefile.arch3
-rw-r--r--libc/sysdeps/linux/xtensa/__start_context.S100
-rw-r--r--libc/sysdeps/linux/xtensa/__syscall_error.c4
-rw-r--r--libc/sysdeps/linux/xtensa/bits/atomic.h177
-rw-r--r--libc/sysdeps/linux/xtensa/bits/fcntl.h7
-rw-r--r--libc/sysdeps/linux/xtensa/bits/ipc.h4
-rw-r--r--libc/sysdeps/linux/xtensa/bits/kernel_stat.h6
-rw-r--r--libc/sysdeps/linux/xtensa/bits/msq.h16
-rw-r--r--libc/sysdeps/linux/xtensa/bits/shm.h24
-rw-r--r--libc/sysdeps/linux/xtensa/bits/stat.h8
-rw-r--r--libc/sysdeps/linux/xtensa/bits/xtensa-config.h6
-rw-r--r--libc/sysdeps/linux/xtensa/crt1.S27
-rw-r--r--libc/sysdeps/linux/xtensa/getcontext.S99
-rw-r--r--libc/sysdeps/linux/xtensa/makecontext.c179
-rw-r--r--libc/sysdeps/linux/xtensa/setcontext.S116
-rw-r--r--libc/sysdeps/linux/xtensa/swapcontext.S173
-rw-r--r--libc/sysdeps/linux/xtensa/sysdep.h7
-rw-r--r--libc/sysdeps/linux/xtensa/ucontext_i.sym15
18 files changed, 911 insertions, 60 deletions
diff --git a/libc/sysdeps/linux/xtensa/Makefile.arch b/libc/sysdeps/linux/xtensa/Makefile.arch
index 23cd08ee5..f3a93caaa 100644
--- a/libc/sysdeps/linux/xtensa/Makefile.arch
+++ b/libc/sysdeps/linux/xtensa/Makefile.arch
@@ -10,3 +10,6 @@ SSRC-y := bsd-_setjmp.S bsd-setjmp.S setjmp.S clone.S \
sigrestorer.S syscall.S mmap.S windowspill.S __longjmp.S vfork.S
CSRC-$(if $(UCLIBC_HAS_THREADS_NATIVE),,y) += fork.c
+
+CSRC-$(UCLIBC_HAS_CONTEXT_FUNCS) += makecontext.c
+SSRC-$(UCLIBC_HAS_CONTEXT_FUNCS) += setcontext.S getcontext.S swapcontext.S __start_context.S
diff --git a/libc/sysdeps/linux/xtensa/__start_context.S b/libc/sysdeps/linux/xtensa/__start_context.S
new file mode 100644
index 000000000..a30d7b618
--- /dev/null
+++ b/libc/sysdeps/linux/xtensa/__start_context.S
@@ -0,0 +1,100 @@
+/* Copyright (C) 2018 - 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+
+#if defined(__XTENSA_CALL0_ABI__)
+/*
+ * There's no entry instruction, makecontext sets up ucontext_t as if
+ * getcontext was called above and is about to return here.
+ * Registers on entry to this function:
+ * a12: func to call
+ * a13: ucp->uc_link, next context to activate if func returns
+ * a14: func argc
+ */
+ .literal_position
+
+ENTRY_PREFIX(__start_context)
+
+ beqz a14, 1f
+
+ /* load func arguments 0..1 from stack and free that space */
+ l32i a2, a1, 8
+ l32i a3, a1, 12
+ addi a1, a1, 16
+ bltui a14, 3, 1f
+
+ /* load func arguments 2..5 from stack and free that space */
+ l32i a4, a1, 0
+ l32i a5, a1, 4
+ l32i a6, a1, 8
+ l32i a7, a1, 12
+ addi a1, a1, 16
+ /* func arguments 6..argc - 1 are now at the top of the stack */
+1:
+ callx0 a12
+ beqz a13, 1f
+ mov a2, a13
+ movi a4, JUMPTARGET (setcontext)
+ callx0 a4
+1:
+ movi a4, JUMPTARGET (_exit)
+ movi a2, 0
+ callx0 a4
+ ill
+END(__start_context)
+#elif defined(__XTENSA_WINDOWED_ABI__)
+/*
+ * There's no entry instruction, makecontext sets up ucontext_t as if
+ * getcontext was called above and is about to return here.
+ * Registers on entry to this function:
+ * a2: func to call
+ * a3: ucp->uc_link, next context to activate if func returns
+ * a4: func argc
+ * a5..a7: func arguments 0..2
+ */
+ .literal_position
+
+ENTRY_PREFIX(__start_context)
+
+ mov a10, a5
+ mov a11, a6
+ mov a12, a7
+ bltui a4, 4, 1f
+
+ /* load func arguments 3..5 from stack and free that space */
+ l32i a13, a1, 4
+ l32i a14, a1, 8
+ l32i a15, a1, 12
+ addi a5, a1, 16
+ movsp a1, a5
+ /* func arguments 6..argc - 1 are now at the top of the stack */
+1:
+ callx8 a2
+ beqz a3, 1f
+ mov a6, a3
+ movi a4, JUMPTARGET (setcontext)
+ callx4 a4
+1:
+ movi a4, JUMPTARGET (_exit)
+ movi a6, 0
+ callx4 a4
+ ill
+END(__start_context)
+#else
+#error Unsupported Xtensa ABI
+#endif
diff --git a/libc/sysdeps/linux/xtensa/__syscall_error.c b/libc/sysdeps/linux/xtensa/__syscall_error.c
index 2b642e816..c682aae49 100644
--- a/libc/sysdeps/linux/xtensa/__syscall_error.c
+++ b/libc/sysdeps/linux/xtensa/__syscall_error.c
@@ -10,8 +10,8 @@
/* This routine is jumped to by all the syscall handlers, to stash
* an error number into errno. */
-int __syscall_error(int err_no) attribute_hidden;
-int __syscall_error(int err_no)
+long __syscall_error(int err_no) attribute_hidden;
+long __syscall_error(int err_no)
{
__set_errno(-err_no);
return -1;
diff --git a/libc/sysdeps/linux/xtensa/bits/atomic.h b/libc/sysdeps/linux/xtensa/bits/atomic.h
index b2be547f0..18b809998 100644
--- a/libc/sysdeps/linux/xtensa/bits/atomic.h
+++ b/libc/sysdeps/linux/xtensa/bits/atomic.h
@@ -18,6 +18,7 @@
#ifndef _BITS_ATOMIC_H
#define _BITS_ATOMIC_H 1
+#include <bits/xtensa-config.h>
#include <inttypes.h>
typedef int32_t atomic32_t;
@@ -50,22 +51,144 @@ typedef uintmax_t uatomic_max_t;
#define __arch_compare_and_exchange_bool_16_rel(mem, newval, oldval) \
(abort (), 0)
+#if XCHAL_HAVE_EXCLUSIVE
+
+/* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
+ Return the old *MEM value. */
+
+#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
+ ({__typeof__(*(mem)) __tmp, __value; \
+ __asm__ __volatile__( \
+ " memw \n" \
+ "1: l32ex %0, %2 \n" \
+ " bne %0, %4, 2f \n" \
+ " mov %1, %3 \n" \
+ " s32ex %1, %2 \n" \
+ " getex %1 \n" \
+ " beqz %1, 1b \n" \
+ " memw \n" \
+ "2: \n" \
+ : "=&a" (__value), "=&a" (__tmp) \
+ : "a" (mem), "a" (newval), "a" (oldval) \
+ : "memory" ); \
+ __value; \
+ })
+
+/* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
+ Return zero if *MEM was changed or non-zero if no exchange happened. */
+
+#define __arch_compare_and_exchange_bool_32_acq(mem, newval, oldval) \
+ ({__typeof__(*(mem)) __tmp, __value; \
+ __asm__ __volatile__( \
+ " memw \n" \
+ "1: l32ex %0, %2 \n" \
+ " sub %0, %4, %0 \n" \
+ " bnez %0, 2f \n" \
+ " mov %1, %3 \n" \
+ " s32ex %1, %2 \n" \
+ " getex %1 \n" \
+ " beqz %1, 1b \n" \
+ " movi %0, 0 \n" \
+ " memw \n" \
+ "2: \n" \
+ : "=&a" (__value), "=&a" (__tmp) \
+ : "a" (mem), "a" (newval), "a" (oldval) \
+ : "memory" ); \
+ __value != 0; \
+ })
+
+/* Store NEWVALUE in *MEM and return the old value. */
+
+#define __arch_exchange_32_acq(mem, newval) \
+ ({__typeof__(*(mem)) __tmp, __value; \
+ __asm__ __volatile__( \
+ " memw \n" \
+ "1: l32ex %0, %2 \n" \
+ " mov %1, %3 \n" \
+ " s32ex %1, %2 \n" \
+ " getex %1 \n" \
+ " beqz %1, 1b \n" \
+ " memw \n" \
+ : "=&a" (__value), "=&a" (__tmp) \
+ : "a" (mem), "a" (newval) \
+ : "memory" ); \
+ __value; \
+ })
+
+/* Add VALUE to *MEM and return the old value of *MEM. */
+
+#define __arch_atomic_exchange_and_add_32(mem, value) \
+ ({__typeof__(*(mem)) __tmp, __value; \
+ __asm__ __volatile__( \
+ " memw \n" \
+ "1: l32ex %0, %2 \n" \
+ " add %1, %0, %3 \n" \
+ " s32ex %1, %2 \n" \
+ " getex %1 \n" \
+ " beqz %1, 1b \n" \
+ " memw \n" \
+ : "=&a" (__value), "=&a" (__tmp) \
+ : "a" (mem), "a" (value) \
+ : "memory" ); \
+ __value; \
+ })
+
+/* Subtract VALUE from *MEM and return the old value of *MEM. */
+
+#define __arch_atomic_exchange_and_sub_32(mem, value) \
+ ({__typeof__(*(mem)) __tmp, __value; \
+ __asm__ __volatile__( \
+ " memw \n" \
+ "1: l32ex %0, %2 \n" \
+ " sub %1, %0, %3 \n" \
+ " s32ex %1, %2 \n" \
+ " getex %1 \n" \
+ " beqz %1, 1b \n" \
+ " memw \n" \
+ : "=&a" (__value), "=&a" (__tmp) \
+ : "a" (mem), "a" (value) \
+ : "memory" ); \
+ __tmp; \
+ })
+
+/* Decrement *MEM if it is > 0, and return the old value. */
+
+#define __arch_atomic_decrement_if_positive_32(mem) \
+ ({__typeof__(*(mem)) __tmp, __value; \
+ __asm__ __volatile__( \
+ " memw \n" \
+ "1: l32ex %0, %2 \n" \
+ " blti %0, 1, 2f \n" \
+ " addi %1, %0, -1 \n" \
+ " s32ex %1, %2 \n" \
+ " getex %1 \n" \
+ " beqz %1, 1b \n" \
+ " memw \n" \
+ "2: \n" \
+ : "=&a" (__value), "=&a" (__tmp) \
+ : "a" (mem) \
+ : "memory" ); \
+ __value; \
+ })
+
+#elif XCHAL_HAVE_S32C1I
+
/* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
Return the old *MEM value. */
#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
({__typeof__(*(mem)) __tmp, __value; \
__asm__ __volatile__( \
- "1: l32i %1, %2, 0 \n" \
+ "1: l32i %1, %2 \n" \
" bne %1, %4, 2f \n" \
" wsr %1, SCOMPARE1 \n" \
" mov %0, %1 \n" \
" mov %1, %3 \n" \
- " s32c1i %1, %2, 0 \n" \
+ " s32c1i %1, %2 \n" \
" bne %0, %1, 1b \n" \
"2: \n" \
- : "=&a" (__value), "=&a" (__tmp) \
- : "a" (mem), "a" (newval), "a" (oldval) \
+ : "=&a" (__value), "=&a" (__tmp), "+m" (*(mem)) \
+ : "a" (newval), "a" (oldval) \
: "memory" ); \
__tmp; \
})
@@ -76,17 +199,17 @@ typedef uintmax_t uatomic_max_t;
#define __arch_compare_and_exchange_bool_32_acq(mem, newval, oldval) \
({__typeof__(*(mem)) __tmp, __value; \
__asm__ __volatile__( \
- "1: l32i %0, %2, 0 \n" \
+ "1: l32i %0, %2 \n" \
" sub %1, %4, %0 \n" \
" bnez %1, 2f \n" \
" wsr %0, SCOMPARE1 \n" \
" mov %1, %3 \n" \
- " s32c1i %1, %2, 0 \n" \
+ " s32c1i %1, %2 \n" \
" bne %0, %1, 1b \n" \
" movi %1, 0 \n" \
"2: \n" \
- : "=&a" (__value), "=&a" (__tmp) \
- : "a" (mem), "a" (newval), "a" (oldval) \
+ : "=&a" (__value), "=&a" (__tmp), "+m" (*(mem)) \
+ : "a" (newval), "a" (oldval) \
: "memory" ); \
__tmp != 0; \
})
@@ -96,13 +219,13 @@ typedef uintmax_t uatomic_max_t;
#define __arch_exchange_32_acq(mem, newval) \
({__typeof__(*(mem)) __tmp, __value; \
__asm__ __volatile__( \
- "1: l32i %0, %2, 0 \n" \
+ "1: l32i %0, %2 \n" \
" wsr %0, SCOMPARE1 \n" \
" mov %1, %3 \n" \
- " s32c1i %1, %2, 0 \n" \
+ " s32c1i %1, %2 \n" \
" bne %0, %1, 1b \n" \
- : "=&a" (__value), "=&a" (__tmp) \
- : "a" (mem), "a" (newval) \
+ : "=&a" (__value), "=&a" (__tmp), "+m" (*(mem)) \
+ : "a" (newval) \
: "memory" ); \
__tmp; \
})
@@ -112,13 +235,13 @@ typedef uintmax_t uatomic_max_t;
#define __arch_atomic_exchange_and_add_32(mem, value) \
({__typeof__(*(mem)) __tmp, __value; \
__asm__ __volatile__( \
- "1: l32i %0, %2, 0 \n" \
+ "1: l32i %0, %2 \n" \
" wsr %0, SCOMPARE1 \n" \
" add %1, %0, %3 \n" \
- " s32c1i %1, %2, 0 \n" \
+ " s32c1i %1, %2 \n" \
" bne %0, %1, 1b \n" \
- : "=&a" (__value), "=&a" (__tmp) \
- : "a" (mem), "a" (value) \
+ : "=&a" (__value), "=&a" (__tmp), "+m" (*(mem)) \
+ : "a" (value) \
: "memory" ); \
__tmp; \
})
@@ -128,13 +251,13 @@ typedef uintmax_t uatomic_max_t;
#define __arch_atomic_exchange_and_sub_32(mem, value) \
({__typeof__(*(mem)) __tmp, __value; \
__asm__ __volatile__( \
- "1: l32i %0, %2, 0 \n" \
+ "1: l32i %0, %2 \n" \
" wsr %0, SCOMPARE1 \n" \
" sub %1, %0, %3 \n" \
- " s32c1i %1, %2, 0 \n" \
+ " s32c1i %1, %2 \n" \
" bne %0, %1, 1b \n" \
- : "=&a" (__value), "=&a" (__tmp) \
- : "a" (mem), "a" (value) \
+ : "=&a" (__value), "=&a" (__tmp), "+m" (*(mem)) \
+ : "a" (value) \
: "memory" ); \
__tmp; \
})
@@ -144,19 +267,23 @@ typedef uintmax_t uatomic_max_t;
#define __arch_atomic_decrement_if_positive_32(mem) \
({__typeof__(*(mem)) __tmp, __value; \
__asm__ __volatile__( \
- "1: l32i %0, %2, 0 \n" \
+ "1: l32i %0, %2 \n" \
" blti %0, 1, 2f \n" \
" wsr %0, SCOMPARE1 \n" \
" addi %1, %0, -1 \n" \
- " s32c1i %1, %2, 0 \n" \
+ " s32c1i %1, %2 \n" \
" bne %0, %1, 1b \n" \
"2: \n" \
- : "=&a" (__value), "=&a" (__tmp) \
- : "a" (mem) \
- : "memory" ); \
+ : "=&a" (__value), "=&a" (__tmp), "+m" (*(mem)) \
+ :: "memory" ); \
__value; \
})
+#else
+
+#error No hardware atomic operations
+
+#endif
/* These are the preferred public interfaces: */
diff --git a/libc/sysdeps/linux/xtensa/bits/fcntl.h b/libc/sysdeps/linux/xtensa/bits/fcntl.h
index f8ae40ca7..5af9d2124 100644
--- a/libc/sysdeps/linux/xtensa/bits/fcntl.h
+++ b/libc/sysdeps/linux/xtensa/bits/fcntl.h
@@ -54,6 +54,7 @@
# define O_DIRECT 040000 /* Direct disk access. */
# define O_NOATIME 01000000 /* Do not set atime. */
# define O_PATH 010000000 /* Resolve pathname but do not open file. */
+# define O_TMPFILE 020200000 /* Atomically create nameless file. */
#endif
/* For now Linux has synchronisity options for data and read operations.
@@ -101,11 +102,13 @@
# define F_SETLEASE 1024 /* Set a lease. */
# define F_GETLEASE 1025 /* Enquire what lease is active. */
# define F_NOTIFY 1026 /* Request notfications on a directory. */
-# define F_DUPFD_CLOEXEC 1030 /* Duplicate file descriptor with
- close-on-exit set on new fd. */
# define F_SETPIPE_SZ 1031 /* Set pipe page size array. */
# define F_GETPIPE_SZ 1032 /* Get pipe page size array. */
#endif
+#if defined __USE_XOPEN2K8 || defined __USE_GNU
+# define F_DUPFD_CLOEXEC 1030 /* Duplicate file descriptor with
+ close-on-exit set on new fd. */
+#endif
/* For F_[GET|SET]FD. */
#define FD_CLOEXEC 1 /* actually anything with low bit set goes */
diff --git a/libc/sysdeps/linux/xtensa/bits/ipc.h b/libc/sysdeps/linux/xtensa/bits/ipc.h
index 2ad5fc0a2..f4222de8c 100644
--- a/libc/sysdeps/linux/xtensa/bits/ipc.h
+++ b/libc/sysdeps/linux/xtensa/bits/ipc.h
@@ -48,6 +48,6 @@ struct ipc_perm
__gid_t cgid; /* Creator's group ID. */
unsigned int mode; /* Read/write permission. */
unsigned int __seq; /* Sequence number. */
- unsigned long int __unused1;
- unsigned long int __unused2;
+ unsigned long int __uclibc_unused1;
+ unsigned long int __uclibc_unused2;
};
diff --git a/libc/sysdeps/linux/xtensa/bits/kernel_stat.h b/libc/sysdeps/linux/xtensa/bits/kernel_stat.h
index 5e4f5c4e5..d884344d3 100644
--- a/libc/sysdeps/linux/xtensa/bits/kernel_stat.h
+++ b/libc/sysdeps/linux/xtensa/bits/kernel_stat.h
@@ -33,13 +33,13 @@ struct kernel_stat64 {
unsigned long long st_rdev; /* Device number, if device. */
long long st_size; /* Size of file, in bytes. */
unsigned long st_blksize; /* Optimal block size for I/O. */
- unsigned long __unused2;
+ unsigned long __uclibc_unused2;
unsigned long long st_blocks; /* Number 512-byte blocks allocated. */
struct timespec st_atim; /* Time of last access. */
struct timespec st_mtim; /* Time of last modification. */
struct timespec st_ctim; /* Time of last status change. */
- unsigned long __unused4;
- unsigned long __unused5;
+ unsigned long __uclibc_unused4;
+ unsigned long __uclibc_unused5;
};
#endif /* _BITS_STAT_STRUCT_H */
diff --git a/libc/sysdeps/linux/xtensa/bits/msq.h b/libc/sysdeps/linux/xtensa/bits/msq.h
index e4f3fa317..0f65b4274 100644
--- a/libc/sysdeps/linux/xtensa/bits/msq.h
+++ b/libc/sysdeps/linux/xtensa/bits/msq.h
@@ -38,19 +38,19 @@ struct msqid_ds
{
struct ipc_perm msg_perm; /* structure describing operation permission */
#if defined (__XTENSA_EB__)
- unsigned long int __unused1;
+ unsigned long int __uclibc_unused1;
__time_t msg_stime; /* time of last msgsnd command */
- unsigned long int __unused2;
+ unsigned long int __uclibc_unused2;
__time_t msg_rtime; /* time of last msgrcv command */
- unsigned long int __unused3;
+ unsigned long int __uclibc_unused3;
__time_t msg_ctime; /* time of last change */
#elif defined (__XTENSA_EL__)
__time_t msg_stime; /* time of last msgsnd command */
- unsigned long int __unused1;
+ unsigned long int __uclibc_unused1;
__time_t msg_rtime; /* time of last msgrcv command */
- unsigned long int __unused2;
+ unsigned long int __uclibc_unused2;
__time_t msg_ctime; /* time of last change */
- unsigned long int __unused3;
+ unsigned long int __uclibc_unused3;
#else
# error endian order not defined
#endif
@@ -59,8 +59,8 @@ struct msqid_ds
msglen_t msg_qbytes; /* max number of bytes allowed on queue */
__pid_t msg_lspid; /* pid of last msgsnd() */
__pid_t msg_lrpid; /* pid of last msgrcv() */
- unsigned long int __unused4;
- unsigned long int __unused5;
+ unsigned long int __uclibc_unused4;
+ unsigned long int __uclibc_unused5;
};
#ifdef __USE_MISC
diff --git a/libc/sysdeps/linux/xtensa/bits/shm.h b/libc/sysdeps/linux/xtensa/bits/shm.h
index d288a1cca..d1e13cb49 100644
--- a/libc/sysdeps/linux/xtensa/bits/shm.h
+++ b/libc/sysdeps/linux/xtensa/bits/shm.h
@@ -52,17 +52,17 @@ struct shmid_ds
size_t shm_segsz; /* size of segment in bytes */
#if defined (__XTENSA_EL__)
__time_t shm_atime; /* time of last shmat() */
- unsigned long int __unused1;
+ unsigned long int __uclibc_unused1;
__time_t shm_dtime; /* time of last shmdt() */
- unsigned long int __unused2;
+ unsigned long int __uclibc_unused2;
__time_t shm_ctime; /* time of last change by shmctl() */
- unsigned long int __unused3;
+ unsigned long int __uclibc_unused3;
#elif defined (__XTENSA_EB__)
- unsigned long int __unused1;
+ unsigned long int __uclibc_unused1;
__time_t shm_atime; /* time of last shmat() */
- unsigned long int __unused2;
+ unsigned long int __uclibc_unused2;
__time_t shm_dtime; /* time of last shmdt() */
- unsigned long int __unused3;
+ unsigned long int __uclibc_unused3;
__time_t shm_ctime; /* time of last change by shmctl() */
#else
# error endian order not defined
@@ -70,8 +70,8 @@ struct shmid_ds
__pid_t shm_cpid; /* pid of creator */
__pid_t shm_lpid; /* pid of last shmop */
shmatt_t shm_nattch; /* number of current attaches */
- unsigned long int __unused4;
- unsigned long int __unused5;
+ unsigned long int __uclibc_unused4;
+ unsigned long int __uclibc_unused5;
};
#ifdef __USE_MISC
@@ -93,10 +93,10 @@ struct shminfo
unsigned long int shmmni;
unsigned long int shmseg;
unsigned long int shmall;
- unsigned long int __unused1;
- unsigned long int __unused2;
- unsigned long int __unused3;
- unsigned long int __unused4;
+ unsigned long int __uclibc_unused1;
+ unsigned long int __uclibc_unused2;
+ unsigned long int __uclibc_unused3;
+ unsigned long int __uclibc_unused4;
};
struct shm_info
diff --git a/libc/sysdeps/linux/xtensa/bits/stat.h b/libc/sysdeps/linux/xtensa/bits/stat.h
index c61b188b7..045a017fd 100644
--- a/libc/sysdeps/linux/xtensa/bits/stat.h
+++ b/libc/sysdeps/linux/xtensa/bits/stat.h
@@ -75,8 +75,8 @@ struct stat
__time_t st_ctime; /* Time of last status change. */
unsigned long int st_ctimensec; /* Nsecs of last status change. */
#endif
- unsigned long int __unused4;
- unsigned long int __unused5;
+ unsigned long int __uclibc_unused4;
+ unsigned long int __uclibc_unused5;
};
#ifdef __USE_LARGEFILE64
@@ -112,8 +112,8 @@ struct stat64
__time_t st_ctime; /* Time of last status change. */
unsigned long int st_ctimensec; /* Nsecs of last status change. */
#endif
- unsigned long __unused4;
- unsigned long __unused5;
+ unsigned long __uclibc_unused4;
+ unsigned long __uclibc_unused5;
};
#endif
diff --git a/libc/sysdeps/linux/xtensa/bits/xtensa-config.h b/libc/sysdeps/linux/xtensa/bits/xtensa-config.h
index 2e60af936..b99928b1e 100644
--- a/libc/sysdeps/linux/xtensa/bits/xtensa-config.h
+++ b/libc/sysdeps/linux/xtensa/bits/xtensa-config.h
@@ -43,4 +43,10 @@
#undef XCHAL_NUM_AREGS
#define XCHAL_NUM_AREGS 64
+#undef XCHAL_HAVE_S32C1I
+#define XCHAL_HAVE_S32C1I 1
+
+#undef XCHAL_HAVE_EXCLUSIVE
+#define XCHAL_HAVE_EXCLUSIVE 0
+
#endif /* !XTENSA_CONFIG_H */
diff --git a/libc/sysdeps/linux/xtensa/crt1.S b/libc/sysdeps/linux/xtensa/crt1.S
index efbe264c0..3fa14ae58 100644
--- a/libc/sysdeps/linux/xtensa/crt1.S
+++ b/libc/sysdeps/linux/xtensa/crt1.S
@@ -76,9 +76,26 @@
.global _start
.type _start, @function
_start:
+#ifdef L_rcrt1
+ .begin no-transform
+ call0 1f
+.Lret_addr:
+ .end no-transform
+ .align 4
+1:
+#endif
#if defined(__XTENSA_WINDOWED_ABI__)
+#ifdef L_rcrt1
+ movi a6, .Lret_addr
+ sub a6, a0, a6
+ movi a0, 0
+ movi a4, reloc_static_pie
+ add a4, a4, a6
+ callx4 a4
+#else
/* Clear a0 to obviously mark the outermost frame. */
movi a0, 0
+#endif
/* Load up the user's main function. */
movi a6, main
@@ -106,8 +123,18 @@ _start:
movi a4, __uClibc_main
callx4 a4
#elif defined(__XTENSA_CALL0_ABI__)
+#ifdef L_rcrt1
+ mov a12, a2
+ movi a2, .Lret_addr
+ sub a2, a0, a2
+ movi a0, reloc_static_pie
+ add a0, a0, a2
+ callx0 a0
+ mov a7, a12
+#else
/* Setup the shared library termination function. */
mov a7, a2
+#endif
/* Load up the user's main function. */
movi a2, main
diff --git a/libc/sysdeps/linux/xtensa/getcontext.S b/libc/sysdeps/linux/xtensa/getcontext.S
new file mode 100644
index 000000000..7588a91b3
--- /dev/null
+++ b/libc/sysdeps/linux/xtensa/getcontext.S
@@ -0,0 +1,99 @@
+/* Copyright (C) 2018 - 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include "ucontext_i.h"
+
+#if defined(__XTENSA_CALL0_ABI__)
+ENTRY(__getcontext)
+ s32i a0, a2, MCONTEXT_SC_PC
+ s32i a1, a2, MCONTEXT_SC_A_0 + 4
+
+ /* save callee-saved registers in the context */
+ s32i a12, a2, MCONTEXT_SC_A_0 + 48
+ s32i a13, a2, MCONTEXT_SC_A_0 + 52
+ s32i a14, a2, MCONTEXT_SC_A_0 + 56
+ s32i a15, a2, MCONTEXT_SC_A_0 + 60
+
+ movi a3, 0
+ addi a4, a2, UCONTEXT_SIGMASK
+ movi a2, SIG_BLOCK
+ movi a5, JUMPTARGET (sigprocmask)
+ jx a5
+END(__getcontext)
+#elif defined(__XTENSA_WINDOWED_ABI__)
+ENTRY(__getcontext)
+ movi a4, __window_spill
+ callx4 a4
+ s32i a0, a2, MCONTEXT_SC_PC
+
+ /* copy registers a0..a3 from spill area */
+ addi a3, a1, -16
+ l32i a4, a3, 0
+ l32i a5, a3, 4
+ l32i a6, a3, 8
+ l32i a7, a3, 12
+ s32i a4, a2, MCONTEXT_SC_A_0 + 0
+ s32i a5, a2, MCONTEXT_SC_A_0 + 4
+ s32i a6, a2, MCONTEXT_SC_A_0 + 8
+ s32i a7, a2, MCONTEXT_SC_A_0 + 12
+
+ /* if it was call4 then register saving is done */
+ extui a4, a0, 30, 2
+ bltui a4, 2, 1f
+
+ /* otherwise load spill overflow area address into a3 */
+ addi a3, a5, -16
+ l32i a3, a3, 4
+ addi a3, a3, -32
+ beqi a4, 2, 2f
+
+ /* copy registers a8..a11 from spill overflow area */
+ addi a3, a3, -16
+ l32i a4, a3, 16
+ l32i a5, a3, 20
+ l32i a6, a3, 24
+ l32i a7, a3, 28
+ s32i a4, a2, MCONTEXT_SC_A_0 + 32
+ s32i a5, a2, MCONTEXT_SC_A_0 + 36
+ s32i a6, a2, MCONTEXT_SC_A_0 + 40
+ s32i a7, a2, MCONTEXT_SC_A_0 + 44
+
+ /* copy registers a4..a7 from spill overflow area */
+2:
+ l32i a4, a3, 0
+ l32i a5, a3, 4
+ l32i a6, a3, 8
+ l32i a7, a3, 12
+ s32i a4, a2, MCONTEXT_SC_A_0 + 16
+ s32i a5, a2, MCONTEXT_SC_A_0 + 20
+ s32i a6, a2, MCONTEXT_SC_A_0 + 24
+ s32i a7, a2, MCONTEXT_SC_A_0 + 28
+1:
+ movi a6, SIG_BLOCK
+ movi a7, 0
+ addi a8, a2, UCONTEXT_SIGMASK
+ movi a4, JUMPTARGET (sigprocmask)
+ callx4 a4
+ mov a2, a6
+ retw
+END(__getcontext)
+#else
+#error Unsupported Xtensa ABI
+#endif
+
+weak_alias (__getcontext, getcontext)
diff --git a/libc/sysdeps/linux/xtensa/makecontext.c b/libc/sysdeps/linux/xtensa/makecontext.c
new file mode 100644
index 000000000..da26a0130
--- /dev/null
+++ b/libc/sysdeps/linux/xtensa/makecontext.c
@@ -0,0 +1,179 @@
+/* Copyright (C) 2018 - 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <string.h>
+#include <ucontext.h>
+
+extern void __start_context (void);
+
+#if defined(__XTENSA_CALL0_ABI__)
+/*
+ * makecontext sets up new stack like this:
+ *
+ * +------------------ stack top (uc_stack.ss_sp + uc_stack.ss_size)
+ * | optional alignment
+ * +------------------ CFA of __start_context, initial sp points here
+ * | optional padding
+ * +------------------ Optional arguments 6..argc - 1
+ * | func arg argc - 1
+ * | func arg argc - 2
+ * | ...
+ * | func arg 6
+ * +------------------ Optional arguments 2..5
+ * | func arg 5
+ * 16 | func arg 4
+ * | func arg 3
+ * | func arg 2
+ * +------------------ Optional arguments 0..1
+ * | func arg 1
+ * 16 | func arg 0
+ * | padding
+ * | padding
+ * +------------------ CFA of pseudo getcontext
+ * |
+ * +------------------ stack bottom (uc_stack.ss_sp)
+ *
+ * When argc is 0 arguments areas are not allocated,
+ * when 1 <= argc < 3 only area for arguments 0..1 is allocated,
+ * when 3 <= argc < 7 areas for arguments 0..1 and 2..5 is allocated,
+ * when argc >= 7 all three arguments areas are allocated.
+ * Arguments 0..5 area is deallocated by the __start_context after
+ * arguments are loaded into registers.
+ * uc_mcontext registers are set as if __start_context made call0
+ * to getcontext, sp points to that pseudo getcontext CFA.
+ * setcontext/swapcontext will arrange for restoring regiters
+ * a1, a12..a15 of __start_context.
+ */
+
+void
+__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
+{
+ unsigned long sp = ((unsigned long) ucp->uc_stack.ss_sp
+ + ucp->uc_stack.ss_size) & -16;
+ int i;
+
+ if (argc > 0)
+ sp -= 4 * (argc + 2);
+ sp &= -16;
+
+ ucp->uc_mcontext.sc_pc = (unsigned long) __start_context;
+ ucp->uc_mcontext.sc_a[1] = sp;
+ ucp->uc_mcontext.sc_a[12] = (unsigned long) func;
+ ucp->uc_mcontext.sc_a[13] = (unsigned long) ucp->uc_link;
+ ucp->uc_mcontext.sc_a[14] = argc;
+
+ if (argc)
+ {
+ va_list ap;
+
+ va_start (ap, argc);
+ for (i = 0; i < argc; ++i)
+ ((int *) sp)[i + 2] = va_arg (ap, int);
+ va_end (ap);
+ }
+}
+#elif defined(__XTENSA_WINDOWED_ABI__)
+/*
+ * makecontext sets up new stack like this:
+ *
+ * +------------------ stack top (uc_stack.ss_sp + uc_stack.ss_size)
+ * | optional alignment
+ * +------------------ CFA of __start_context
+ * 16 | Outermost caller spill area
+ * +------------------
+ * 16 | __start_context overflow area
+ * +------------------ initial sp points here
+ * | optional padding
+ * +------------------ Optional arguments 6..argc - 1
+ * | func arg argc - 1
+ * | func arg argc - 2
+ * | ...
+ * | func arg 6
+ * +------------------ Optional arguments 3..5
+ * | func arg 5
+ * 16 | func arg 4
+ * | func arg 3
+ * | padding
+ * +------------------ CFA of pseudo getcontext
+ * 16 | __start_context caller spill area
+ * +------------------
+ * |
+ * +------------------ stack bottom (uc_stack.ss_sp)
+ *
+ * When argc < 4 both arguments areas are not allocated,
+ * when 4 <= argc < 7 only area for arguments 3..5 is allocated,
+ * when argc >= 7 both arguments areas are allocated.
+ * Arguments 3..5 area is deallocated by the __start_context after
+ * arguments are loaded into registers.
+ * uc_mcontext registers are set as if __start_context made call8
+ * to getcontext, sp points to that pseudo getcontext CFA, spill
+ * area under that sp has a1 pointing to the __start_context CFA
+ * at the top of the stack. setcontext/swapcontext will arrange for
+ * restoring regiters a0..a7 of __start_context.
+ */
+
+void
+__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
+{
+ unsigned long sp = ((unsigned long) ucp->uc_stack.ss_sp
+ + ucp->uc_stack.ss_size - 32) & -16;
+ unsigned long spill0[4] =
+ {
+ 0, sp + 32, 0, 0,
+ };
+ int i;
+
+ memset ((void *) sp, 0, 32);
+
+ if (argc > 2)
+ sp -= 4 * (argc - 2);
+ sp &= -16;
+
+ ucp->uc_mcontext.sc_pc =
+ ((unsigned long) __start_context & 0x3fffffff) + 0x80000000;
+ ucp->uc_mcontext.sc_a[0] = 0;
+ ucp->uc_mcontext.sc_a[1] = sp;
+ ucp->uc_mcontext.sc_a[2] = (unsigned long) func;
+ ucp->uc_mcontext.sc_a[3] = (unsigned long) ucp->uc_link;
+ ucp->uc_mcontext.sc_a[4] = argc;
+
+ if (argc)
+ {
+ va_list ap;
+
+ va_start (ap, argc);
+ for (i = 0; i < argc; ++i)
+ {
+ if (i < 3)
+ ucp->uc_mcontext.sc_a[5 + i] = va_arg (ap, int);
+ else
+ ((int *) sp)[i - 2] = va_arg (ap, int);
+ }
+ va_end (ap);
+ }
+
+ sp -= 16;
+ memcpy ((void *) sp, spill0, sizeof (spill0));
+}
+#else
+#error Unsupported Xtensa ABI
+#endif
+
+weak_alias (__makecontext, makecontext)
diff --git a/libc/sysdeps/linux/xtensa/setcontext.S b/libc/sysdeps/linux/xtensa/setcontext.S
new file mode 100644
index 000000000..4df7cc049
--- /dev/null
+++ b/libc/sysdeps/linux/xtensa/setcontext.S
@@ -0,0 +1,116 @@
+/* Copyright (C) 2018 - 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include "ucontext_i.h"
+
+#if defined(__XTENSA_CALL0_ABI__)
+ENTRY(__setcontext)
+ addi sp, sp, -16
+ s32i a0, sp, 0
+ s32i a2, sp, 4
+
+ addi a3, a2, UCONTEXT_SIGMASK
+ movi a4, 0
+ movi a2, SIG_SETMASK
+ movi a5, JUMPTARGET (sigprocmask)
+ callx0 a5
+ bnez a2, .Lerror
+
+ l32i a2, sp, 4
+ l32i a0, a2, MCONTEXT_SC_PC
+ l32i a1, a2, MCONTEXT_SC_A_0 + 4
+
+ /* load callee-saved registers from the context */
+ l32i a12, a2, MCONTEXT_SC_A_0 + 48
+ l32i a13, a2, MCONTEXT_SC_A_0 + 52
+ l32i a14, a2, MCONTEXT_SC_A_0 + 56
+ l32i a15, a2, MCONTEXT_SC_A_0 + 60
+ movi a2, 0
+ ret
+.Lerror:
+ l32i a0, sp, 0
+ addi sp, sp, 16
+ ret
+END(__setcontext)
+#elif defined(__XTENSA_WINDOWED_ABI__)
+ENTRY(__setcontext)
+ movi a6, SIG_SETMASK
+ addi a7, a2, UCONTEXT_SIGMASK
+ movi a8, 0
+ movi a4, JUMPTARGET (sigprocmask)
+ callx4 a4
+ bnez a6, .Lerror
+ movi a4, __window_spill
+ callx4 a4
+
+ l32i a0, a2, MCONTEXT_SC_PC
+
+ /* copy registers a0..a3 to spill area */
+ addi a3, a1, -16
+ l32i a4, a2, MCONTEXT_SC_A_0 + 0
+ l32i a5, a2, MCONTEXT_SC_A_0 + 4
+ l32i a6, a2, MCONTEXT_SC_A_0 + 8
+ l32i a7, a2, MCONTEXT_SC_A_0 + 12
+ s32i a4, a3, 0
+ s32i a5, a3, 4
+ s32i a6, a3, 8
+ s32i a7, a3, 12
+
+ /* if it was call4 then register setup is done */
+ extui a4, a0, 30, 2
+ bltui a4, 2, 1f
+
+ /* otherwise load spill overflow area address into a3 */
+ addi a3, a5, -16
+ l32i a3, a3, 4
+ addi a3, a3, -32
+ beqi a4, 2, 2f
+
+ /* copy registers a8..a11 to spill overflow area */
+ addi a3, a3, -16
+ l32i a4, a2, MCONTEXT_SC_A_0 + 32
+ l32i a5, a2, MCONTEXT_SC_A_0 + 36
+ l32i a6, a2, MCONTEXT_SC_A_0 + 40
+ l32i a7, a2, MCONTEXT_SC_A_0 + 44
+ s32i a4, a3, 16
+ s32i a5, a3, 20
+ s32i a6, a3, 24
+ s32i a7, a3, 28
+
+ /* copy registers a4..a7 to spill overflow area */
+2:
+ l32i a4, a2, MCONTEXT_SC_A_0 + 16
+ l32i a5, a2, MCONTEXT_SC_A_0 + 20
+ l32i a6, a2, MCONTEXT_SC_A_0 + 24
+ l32i a7, a2, MCONTEXT_SC_A_0 + 28
+ s32i a4, a3, 0
+ s32i a5, a3, 4
+ s32i a6, a3, 8
+ s32i a7, a3, 12
+1:
+ movi a2, 0
+ retw
+.Lerror:
+ mov a2, a6
+ retw
+END(__setcontext)
+#else
+#error Unsupported Xtensa ABI
+#endif
+
+weak_alias (__setcontext, setcontext)
diff --git a/libc/sysdeps/linux/xtensa/swapcontext.S b/libc/sysdeps/linux/xtensa/swapcontext.S
new file mode 100644
index 000000000..a215edc6d
--- /dev/null
+++ b/libc/sysdeps/linux/xtensa/swapcontext.S
@@ -0,0 +1,173 @@
+/* Copyright (C) 2018 - 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include "ucontext_i.h"
+
+#if defined(__XTENSA_CALL0_ABI__)
+ENTRY(__swapcontext)
+ s32i a0, a2, MCONTEXT_SC_PC
+ s32i a1, a2, MCONTEXT_SC_A_0 + 4
+
+ /* save callee-saved registers in the context */
+ s32i a12, a2, MCONTEXT_SC_A_0 + 48
+ s32i a13, a2, MCONTEXT_SC_A_0 + 52
+ s32i a14, a2, MCONTEXT_SC_A_0 + 56
+ s32i a15, a2, MCONTEXT_SC_A_0 + 60
+
+ mov a12, a3
+ mov a13, a2
+
+ addi a3, a3, UCONTEXT_SIGMASK
+ addi a4, a2, UCONTEXT_SIGMASK
+ movi a2, SIG_SETMASK
+ movi a5, JUMPTARGET (sigprocmask)
+ callx0 a5
+ bnez a2, .Lerror
+
+ mov a2, a12
+ l32i a0, a2, MCONTEXT_SC_PC
+ l32i a1, a2, MCONTEXT_SC_A_0 + 4
+
+ /* load callee-saved registers from the context */
+ l32i a12, a2, MCONTEXT_SC_A_0 + 48
+ l32i a13, a2, MCONTEXT_SC_A_0 + 52
+ l32i a14, a2, MCONTEXT_SC_A_0 + 56
+ l32i a15, a2, MCONTEXT_SC_A_0 + 60
+
+ movi a2, 0
+ ret
+.Lerror:
+ l32i a0, a13, MCONTEXT_SC_PC
+ l32i a12, a13, MCONTEXT_SC_A_0 + 48
+ l32i a13, a13, MCONTEXT_SC_A_0 + 52
+ ret
+END(__swapcontext)
+#elif defined(__XTENSA_WINDOWED_ABI__)
+ENTRY(__swapcontext)
+ movi a4, __window_spill
+ callx4 a4
+ mov a9, a3
+ s32i a0, a2, MCONTEXT_SC_PC
+
+ /* copy registers a0..a3 from spill area */
+ addi a3, a1, -16
+ l32i a4, a3, 0
+ l32i a5, a3, 4
+ l32i a6, a3, 8
+ l32i a7, a3, 12
+ s32i a4, a2, MCONTEXT_SC_A_0 + 0
+ s32i a5, a2, MCONTEXT_SC_A_0 + 4
+ s32i a6, a2, MCONTEXT_SC_A_0 + 8
+ s32i a7, a2, MCONTEXT_SC_A_0 + 12
+
+ /* if it was call4 then register saving is done */
+ extui a4, a0, 30, 2
+ bltui a4, 2, 1f
+
+ /* otherwise load spill overflow area address into a3 */
+ addi a3, a5, -16
+ l32i a3, a3, 4
+ addi a3, a3, -32
+ beqi a4, 2, 2f
+
+ /* copy registers a8..a11 from spill overflow area */
+ addi a3, a3, -16
+ l32i a4, a3, 16
+ l32i a5, a3, 20
+ l32i a6, a3, 24
+ l32i a7, a3, 28
+ s32i a4, a2, MCONTEXT_SC_A_0 + 32
+ s32i a5, a2, MCONTEXT_SC_A_0 + 36
+ s32i a6, a2, MCONTEXT_SC_A_0 + 40
+ s32i a7, a2, MCONTEXT_SC_A_0 + 44
+
+ /* copy registers a4..a7 from spill overflow area */
+2:
+ l32i a4, a3, 0
+ l32i a5, a3, 4
+ l32i a6, a3, 8
+ l32i a7, a3, 12
+ s32i a4, a2, MCONTEXT_SC_A_0 + 16
+ s32i a5, a2, MCONTEXT_SC_A_0 + 20
+ s32i a6, a2, MCONTEXT_SC_A_0 + 24
+ s32i a7, a2, MCONTEXT_SC_A_0 + 28
+1:
+ movi a6, SIG_SETMASK
+ addi a7, a9, UCONTEXT_SIGMASK
+ addi a8, a2, UCONTEXT_SIGMASK
+ mov a2, a9
+ movi a4, JUMPTARGET (sigprocmask)
+ callx4 a4
+ bnez a6, .Lerror
+
+ l32i a0, a2, MCONTEXT_SC_PC
+
+ /* copy registers a0..a3 to spill area */
+ addi a3, a1, -16
+ l32i a4, a2, MCONTEXT_SC_A_0 + 0
+ l32i a5, a2, MCONTEXT_SC_A_0 + 4
+ l32i a6, a2, MCONTEXT_SC_A_0 + 8
+ l32i a7, a2, MCONTEXT_SC_A_0 + 12
+ s32i a4, a3, 0
+ s32i a5, a3, 4
+ s32i a6, a3, 8
+ s32i a7, a3, 12
+
+ /* if it was call4 then register setup is done */
+ extui a4, a0, 30, 2
+ bltui a4, 2, 1f
+
+ /* otherwise load spill overflow area address into a3 */
+ addi a3, a5, -16
+ l32i a3, a3, 4
+ addi a3, a3, -32
+ beqi a4, 2, 2f
+
+ /* copy registers a8..a11 to spill overflow area */
+ addi a3, a3, -16
+ l32i a4, a2, MCONTEXT_SC_A_0 + 32
+ l32i a5, a2, MCONTEXT_SC_A_0 + 36
+ l32i a6, a2, MCONTEXT_SC_A_0 + 40
+ l32i a7, a2, MCONTEXT_SC_A_0 + 44
+ s32i a4, a3, 16
+ s32i a5, a3, 20
+ s32i a6, a3, 24
+ s32i a7, a3, 28
+
+ /* copy registers a4..a7 to spill overflow area */
+2:
+ l32i a4, a2, MCONTEXT_SC_A_0 + 16
+ l32i a5, a2, MCONTEXT_SC_A_0 + 20
+ l32i a6, a2, MCONTEXT_SC_A_0 + 24
+ l32i a7, a2, MCONTEXT_SC_A_0 + 28
+ s32i a4, a3, 0
+ s32i a5, a3, 4
+ s32i a6, a3, 8
+ s32i a7, a3, 12
+1:
+ movi a2, 0
+ retw
+.Lerror:
+ mov a2, a6
+ retw
+END(__swapcontext)
+#else
+#error Unsupported Xtensa ABI
+#endif
+
+weak_alias (__swapcontext, swapcontext)
diff --git a/libc/sysdeps/linux/xtensa/sysdep.h b/libc/sysdeps/linux/xtensa/sysdep.h
index 0671f0783..80b3f30fc 100644
--- a/libc/sysdeps/linux/xtensa/sysdep.h
+++ b/libc/sysdeps/linux/xtensa/sysdep.h
@@ -39,12 +39,15 @@
#endif
-#define ENTRY(name) \
+#define ENTRY_PREFIX(name) \
.globl C_SYMBOL_NAME(name); \
ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name), @function); \
.align ALIGNARG(2); \
LITERAL_POSITION; \
- C_LABEL(name) \
+ C_LABEL(name)
+
+#define ENTRY(name) \
+ ENTRY_PREFIX(name) \
abi_entry(sp, FRAMESIZE);
#define HIDDEN_ENTRY(name) \
diff --git a/libc/sysdeps/linux/xtensa/ucontext_i.sym b/libc/sysdeps/linux/xtensa/ucontext_i.sym
new file mode 100644
index 000000000..4770c36c9
--- /dev/null
+++ b/libc/sysdeps/linux/xtensa/ucontext_i.sym
@@ -0,0 +1,15 @@
+#include <inttypes.h>
+#include <signal.h>
+#include <stddef.h>
+#include <sys/ucontext.h>
+
+SIG_BLOCK
+SIG_SETMASK
+
+-- Offsets of the fields in the ucontext_t structure.
+#define ucontext(member) offsetof (ucontext_t, member)
+#define mcontext(member) ucontext (uc_mcontext.member)
+
+UCONTEXT_SIGMASK ucontext (uc_sigmask)
+MCONTEXT_SC_A_0 mcontext (sc_a[0])
+MCONTEXT_SC_PC mcontext (sc_pc)
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-17 21:55:06 +0000