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-rw-r--r--libc/sysdeps/linux/xtensa/Makefile.arch3
-rw-r--r--libc/sysdeps/linux/xtensa/__start_context.S104
-rw-r--r--libc/sysdeps/linux/xtensa/bits/elf-fdpic.h117
-rw-r--r--libc/sysdeps/linux/xtensa/bits/fcntl.h2
-rw-r--r--libc/sysdeps/linux/xtensa/bits/stat.h4
-rw-r--r--libc/sysdeps/linux/xtensa/bits/uClibc_arch_features.h3
-rw-r--r--libc/sysdeps/linux/xtensa/bits/xtensa-config.h20
-rw-r--r--libc/sysdeps/linux/xtensa/clone.S6
-rw-r--r--libc/sysdeps/linux/xtensa/crt1.S108
-rw-r--r--libc/sysdeps/linux/xtensa/crti.S10
-rw-r--r--libc/sysdeps/linux/xtensa/crtn.S6
-rw-r--r--libc/sysdeps/linux/xtensa/crtreloc.c105
-rw-r--r--libc/sysdeps/linux/xtensa/getcontext.S100
-rw-r--r--libc/sysdeps/linux/xtensa/makecontext.c184
-rw-r--r--libc/sysdeps/linux/xtensa/setcontext.S117
-rw-r--r--libc/sysdeps/linux/xtensa/setjmp.S3
-rw-r--r--libc/sysdeps/linux/xtensa/swapcontext.S174
-rw-r--r--libc/sysdeps/linux/xtensa/sysdep.h55
-rw-r--r--libc/sysdeps/linux/xtensa/ucontext_i.sym15
19 files changed, 1125 insertions, 11 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..e6ce93347
--- /dev/null
+++ b/libc/sysdeps/linux/xtensa/__start_context.S
@@ -0,0 +1,104 @@
+/* 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 (function descriptor in case of FDPIC)
+ * a13: ucp->uc_link, next context to activate if func returns
+ * a14: func argc
+ * a15: current GOT pointer (in case of FDPIC)
+ */
+ .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:
+ FDPIC_LOAD_FUNCDESC (a12, a12)
+ callx0 a12
+ beqz a13, 1f
+ mov a2, a13
+ movi a4, JUMPTARGET (setcontext)
+ FDPIC_LOAD_JUMPTARGET (a4, a15, a4)
+ callx0 a4
+1:
+ movi a4, JUMPTARGET (_exit)
+ movi a2, 0
+ FDPIC_LOAD_JUMPTARGET (a4, a15, a4)
+ 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/bits/elf-fdpic.h b/libc/sysdeps/linux/xtensa/bits/elf-fdpic.h
new file mode 100644
index 000000000..19bb247b8
--- /dev/null
+++ b/libc/sysdeps/linux/xtensa/bits/elf-fdpic.h
@@ -0,0 +1,117 @@
+/* Copyright 2003, 2004 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.
+
+In addition to the permissions in the GNU Lesser General Public
+License, the Free Software Foundation gives you unlimited
+permission to link the compiled version of this file with other
+programs, and to distribute those programs without any restriction
+coming from the use of this file. (The GNU Lesser General Public
+License restrictions do apply in other respects; for example, they
+cover modification of the file, and distribution when not linked
+into another program.)
+
+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
+Library 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; see the file COPYING.LIB. If
+not, see <http://www.gnu.org/licenses/>. */
+
+#ifndef _BITS_ELF_FDPIC_H
+#define _BITS_ELF_FDPIC_H
+
+/* These data structures are described in the FDPIC ABI extension.
+ The kernel passes a process a memory map, such that for every LOAD
+ segment there is an elf32_fdpic_loadseg entry. A pointer to an
+ elf32_fdpic_loadmap is passed in r7 at start-up, and a pointer to
+ an additional such map is passed in r8 for the interpreter, when
+ there is one. */
+
+#include <elf.h>
+
+/* This data structure represents a PT_LOAD segment. */
+struct elf32_fdpic_loadseg
+{
+ /* Core address to which the segment is mapped. */
+ Elf32_Addr addr;
+ /* VMA recorded in the program header. */
+ Elf32_Addr p_vaddr;
+ /* Size of this segment in memory. */
+ Elf32_Word p_memsz;
+};
+
+struct elf32_fdpic_loadmap {
+ /* Protocol version number, must be zero. */
+ Elf32_Half version;
+ /* Number of segments in this map. */
+ Elf32_Half nsegs;
+ /* The actual memory map. */
+ struct elf32_fdpic_loadseg segs[/*nsegs*/];
+};
+
+struct elf32_fdpic_loadaddr {
+ struct elf32_fdpic_loadmap *map;
+ void *got_value;
+};
+
+/* Map a pointer's VMA to its corresponding address according to the
+ load map. */
+static __always_inline void *
+__reloc_pointer (void *p,
+ const struct elf32_fdpic_loadmap *map)
+{
+ int c;
+
+#if 0
+ if (map->version != 0)
+ /* Crash. */
+ ((void(*)())0)();
+#endif
+
+ /* No special provision is made for NULL. We don't want NULL
+ addresses to go through relocation, so they shouldn't be in
+ .rofixup sections, and, if they're present in dynamic
+ relocations, they shall be mapped to the NULL address without
+ undergoing relocations. */
+
+ for (c = 0;
+ /* Take advantage of the fact that the loadmap is ordered by
+ virtual addresses. In general there will only be 2 entries,
+ so it's not profitable to do a binary search. */
+ c < map->nsegs && p >= (void*)map->segs[c].p_vaddr;
+ c++)
+ {
+ /* This should be computed as part of the pointer comparison
+ above, but we want to use the carry in the comparison, so we
+ can't convert it to an integer type beforehand. */
+ unsigned long offset = (char*)p - (char*)map->segs[c].p_vaddr;
+ /* We only check for one-past-the-end for the last segment,
+ assumed to be the data segment, because other cases are
+ ambiguous in the absence of padding between segments, and
+ rofixup already serves as padding between text and data.
+ Unfortunately, unless we special-case the last segment, we
+ fail to relocate the _end symbol. */
+ if (offset < map->segs[c].p_memsz
+ || (offset == map->segs[c].p_memsz && c + 1 == map->nsegs))
+ return (char*)map->segs[c].addr + offset;
+ }
+
+ /* We might want to crash instead. */
+ return (void*)-1;
+}
+
+# define __RELOC_POINTER(ptr, loadaddr) \
+ (__reloc_pointer ((void*)(ptr), \
+ (loadaddr).map))
+
+void*
+__self_reloc (const struct elf32_fdpic_loadmap *map, void ***p, void ***e);
+
+#endif /* _BITS_ELF_FDPIC_H */
diff --git a/libc/sysdeps/linux/xtensa/bits/fcntl.h b/libc/sysdeps/linux/xtensa/bits/fcntl.h
index 5af9d2124..9bc5fa893 100644
--- a/libc/sysdeps/linux/xtensa/bits/fcntl.h
+++ b/libc/sysdeps/linux/xtensa/bits/fcntl.h
@@ -245,3 +245,5 @@ extern ssize_t tee (int __fdin, int __fdout, size_t __len,
#endif
__END_DECLS
+/* Include generic Linux declarations. */
+#include <bits/fcntl-linux.h>
diff --git a/libc/sysdeps/linux/xtensa/bits/stat.h b/libc/sysdeps/linux/xtensa/bits/stat.h
index 045a017fd..43af825ec 100644
--- a/libc/sysdeps/linux/xtensa/bits/stat.h
+++ b/libc/sysdeps/linux/xtensa/bits/stat.h
@@ -54,7 +54,7 @@ struct stat
unsigned long __pad2;
__blkcnt64_t st_blocks; /* Number 512-byte blocks allocated. */
#endif
-#ifdef __USE_MISC
+#if defined(__USE_MISC) || defined(__USE_XOPEN2K8)
/* Nanosecond resolution timestamps are stored in a format
equivalent to 'struct timespec'. This is the type used
whenever possible but the Unix namespace rules do not allow the
@@ -94,7 +94,7 @@ struct stat64
unsigned long __pad2;
__blkcnt64_t st_blocks; /* Number 512-byte blocks allocated. */
-#ifdef __USE_MISC
+#if defined(__USE_MISC) || defined(__USE_XOPEN2K8)
/* Nanosecond resolution timestamps are stored in a format
equivalent to 'struct timespec'. This is the type used
whenever possible but the Unix namespace rules do not allow the
diff --git a/libc/sysdeps/linux/xtensa/bits/uClibc_arch_features.h b/libc/sysdeps/linux/xtensa/bits/uClibc_arch_features.h
index de9b38983..a15744c2f 100644
--- a/libc/sysdeps/linux/xtensa/bits/uClibc_arch_features.h
+++ b/libc/sysdeps/linux/xtensa/bits/uClibc_arch_features.h
@@ -11,9 +11,6 @@
/* can your target use syscall6() for mmap ? */
#define __UCLIBC_MMAP_HAS_6_ARGS__
-/* does your target use statx */
-#undef __UCLIBC_HAVE_STATX__
-
/* does your target align 64bit values in register pairs ? (32bit arches only) */
#define __UCLIBC_SYSCALL_ALIGN_64BIT__
diff --git a/libc/sysdeps/linux/xtensa/bits/xtensa-config.h b/libc/sysdeps/linux/xtensa/bits/xtensa-config.h
index b99928b1e..bfcd571d2 100644
--- a/libc/sysdeps/linux/xtensa/bits/xtensa-config.h
+++ b/libc/sysdeps/linux/xtensa/bits/xtensa-config.h
@@ -32,21 +32,41 @@
macros. */
#undef XCHAL_HAVE_NSA
+#ifdef __XCHAL_HAVE_NSA
+#define XCHAL_HAVE_NSA __XCHAL_HAVE_NSA
+#else
#define XCHAL_HAVE_NSA 1
+#endif
#undef XCHAL_HAVE_LOOPS
+#ifdef __XCHAL_HAVE_LOOPS
+#define XCHAL_HAVE_LOOPS __XCHAL_HAVE_LOOPS
+#else
#define XCHAL_HAVE_LOOPS 1
+#endif
/* Assume the maximum number of AR registers. This currently only affects
the __window_spill function, and it is always safe to flush extra. */
#undef XCHAL_NUM_AREGS
+#ifdef __XCHAL_NUM_AREGS
+#define XCHAL_NUM_AREGS __XCHAL_NUM_AREGS
+#else
#define XCHAL_NUM_AREGS 64
+#endif
#undef XCHAL_HAVE_S32C1I
+#ifdef __XCHAL_HAVE_S32C1I
+#define XCHAL_HAVE_S32C1I __XCHAL_HAVE_S32C1I
+#else
#define XCHAL_HAVE_S32C1I 1
+#endif
#undef XCHAL_HAVE_EXCLUSIVE
+#ifdef __XCHAL_HAVE_EXCLUSIVE
+#define XCHAL_HAVE_EXCLUSIVE __XCHAL_HAVE_EXCLUSIVE
+#else
#define XCHAL_HAVE_EXCLUSIVE 0
+#endif
#endif /* !XTENSA_CONFIG_H */
diff --git a/libc/sysdeps/linux/xtensa/clone.S b/libc/sysdeps/linux/xtensa/clone.S
index ebfdcc1f6..a11044cd0 100644
--- a/libc/sysdeps/linux/xtensa/clone.S
+++ b/libc/sysdeps/linux/xtensa/clone.S
@@ -81,11 +81,17 @@ ENTRY (__clone)
callx4 a2
#elif defined(__XTENSA_CALL0_ABI__)
mov a2, a9 /* load up the 'arg' parameter */
+#ifdef __FDPIC__
+ mov a12, a11
+ l32i a11, a7, 4
+ l32i a7, a7, 0
+#endif
callx0 a7 /* call the user's function */
/* Call _exit. Note that any return parameter from the user's
function in a2 is seen as inputs to _exit. */
movi a0, JUMPTARGET(_exit)
+ FDPIC_LOAD_JUMPTARGET(a0, a12, a0)
callx0 a0
#else
#error Unsupported Xtensa ABI
diff --git a/libc/sysdeps/linux/xtensa/crt1.S b/libc/sysdeps/linux/xtensa/crt1.S
index efbe264c0..a12f82dd6 100644
--- a/libc/sysdeps/linux/xtensa/crt1.S
+++ b/libc/sysdeps/linux/xtensa/crt1.S
@@ -35,6 +35,86 @@
#include <features.h>
+#if defined(__FDPIC__)
+
+/* This is the canonical entry point, usually the first thing in the text
+ segment. When the entry point runs, most register values are unspecified,
+ except for:
+
+ a6 Address of .dynamic section
+ a5 Interpreter map
+ a4 Executable map
+
+ a2 Contains a function pointer to be registered with `atexit'.
+ This is how the dynamic linker arranges to have DT_FINI
+ functions called for shared libraries that have been loaded
+ before this code runs.
+
+ a1 The stack (i.e., a1+16) contains the arguments and environment:
+ a1+0 argc
+ a1+4 argv[0]
+ ...
+ a1+(4*argc) NULL
+ a1+(4*(argc+1)) envp[0]
+ ...
+ NULL
+ */
+ .text
+ .align 4
+ .literal_position
+ .global _start
+ .type _start, @function
+_start:
+#if defined(__XTENSA_CALL0_ABI__)
+
+ .begin no-transform
+ call0 1f
+2:
+ .end no-transform
+ .align 4
+ .literal_position
+1:
+ movi a15, 2b
+ sub a15, a0, a15
+
+ mov a12, a4
+ mov a13, a5
+ mov a14, a6
+ mov a2, a4
+ movi a3, __ROFIXUP_LIST__
+ add a3, a3, a15
+ movi a4, __ROFIXUP_END__
+ add a4, a4, a15
+ movi a0, __self_reloc
+ add a0, a0, a15
+ callx0 a0
+
+ mov a11, a2
+ movi a2, main@GOTOFFFUNCDESC
+ add a2, a2, a11
+ l32i a3, sp, 0 /* argc */
+ addi a4, sp, 4 /* argv */
+ /* a5 is either 0 when static or set by the RTLD to the rtld_fini */
+ mov a7, a13
+ /* unused stack_end argument is what used to be argc */
+ movi a5, _init@GOTOFFFUNCDESC
+ add a5, a5, a11
+ movi a6, _fini@GOTOFFFUNCDESC
+ add a6, a6, a11
+
+ movi a0, __uClibc_main@GOTOFFFUNCDESC
+ add a0, a0, a11
+ l32i a11, a0, 4
+ l32i a0, a0, 0
+ callx0 a0
+ ill
+
+#else
+#error Unsupported Xtensa ABI
+#endif
+
+#else /* defined(__FDPIC__) */
+
#ifndef __UCLIBC_CTOR_DTOR__
.weak _init
.weak _fini
@@ -76,9 +156,26 @@
.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 +203,18 @@ _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
@@ -146,3 +253,4 @@ __data_start:
.long 0
.weak data_start
data_start = __data_start
+#endif /* defined(__FDPIC__) */
diff --git a/libc/sysdeps/linux/xtensa/crti.S b/libc/sysdeps/linux/xtensa/crti.S
index ba804eb45..2923ff09d 100644
--- a/libc/sysdeps/linux/xtensa/crti.S
+++ b/libc/sysdeps/linux/xtensa/crti.S
@@ -3,6 +3,7 @@
.section .init
.align 4
.global _init
+ .hidden _init
.type _init, @function
_init:
#if defined(__XTENSA_WINDOWED_ABI__)
@@ -10,6 +11,10 @@ _init:
#elif defined(__XTENSA_CALL0_ABI__)
addi sp, sp, -16
s32i a0, sp, 0
+#ifdef __FDPIC__
+ s32i a12, sp, 4
+ mov a12, a11
+#endif
#else
#error Unsupported Xtensa ABI
#endif
@@ -17,6 +22,7 @@ _init:
.section .fini
.align 4
.global _fini
+ .hidden _fini
.type _fini, @function
_fini:
#if defined(__XTENSA_WINDOWED_ABI__)
@@ -24,6 +30,10 @@ _fini:
#elif defined(__XTENSA_CALL0_ABI__)
addi sp, sp, -16
s32i a0, sp, 0
+#ifdef __FDPIC__
+ s32i a12, sp, 4
+ mov a12, a11
+#endif
#else
#error Unsupported Xtensa ABI
#endif
diff --git a/libc/sysdeps/linux/xtensa/crtn.S b/libc/sysdeps/linux/xtensa/crtn.S
index a3598da1a..6f797e8bd 100644
--- a/libc/sysdeps/linux/xtensa/crtn.S
+++ b/libc/sysdeps/linux/xtensa/crtn.S
@@ -4,6 +4,9 @@
#if defined(__XTENSA_WINDOWED_ABI__)
retw
#elif defined(__XTENSA_CALL0_ABI__)
+#ifdef __FDPIC__
+ l32i a12, sp, 4
+#endif
l32i a0, sp, 0
addi sp, sp, 16
ret
@@ -15,6 +18,9 @@
#if defined(__XTENSA_WINDOWED_ABI__)
retw
#elif defined(__XTENSA_CALL0_ABI__)
+#ifdef __FDPIC__
+ l32i a12, sp, 4
+#endif
l32i a0, sp, 0
addi sp, sp, 16
ret
diff --git a/libc/sysdeps/linux/xtensa/crtreloc.c b/libc/sysdeps/linux/xtensa/crtreloc.c
new file mode 100644
index 000000000..697ef91ab
--- /dev/null
+++ b/libc/sysdeps/linux/xtensa/crtreloc.c
@@ -0,0 +1,105 @@
+/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
+ written by Alexandre Oliva <aoliva@redhat.com>
+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.
+
+In addition to the permissions in the GNU Lesser General Public
+License, the Free Software Foundation gives you unlimited
+permission to link the compiled version of this file with other
+programs, and to distribute those programs without any restriction
+coming from the use of this file. (The GNU Lesser General Public
+License restrictions do apply in other respects; for example, they
+cover modification of the file, and distribution when not linked
+into another program.)
+
+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
+Library 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; see the file COPYING.LIB. If
+not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef __FDPIC__
+
+#include <sys/types.h>
+#include <link.h>
+
+/* This file is to be compiled into crt object files, to enable
+ executables to easily self-relocate. */
+
+/* Compute the runtime address of pointer in the range [p,e), and then
+ map the pointer pointed by it. */
+static __always_inline void ***
+reloc_range_indirect (void ***p, void ***e,
+ const struct elf32_fdpic_loadmap *map)
+{
+ while (p < e)
+ {
+ if (*p != (void **)-1)
+ {
+ void *ptr = __reloc_pointer (*p, map);
+
+ if (ptr != (void *)-1)
+ {
+ unsigned long off = ((unsigned long)ptr & 3) * 8;
+ unsigned long *pa = (unsigned long *)((unsigned long)ptr & -4);
+ unsigned long v2;
+ void *pt;
+
+ if (off)
+ {
+ unsigned long v0, v1;
+#ifdef __XTENSA_EB__
+ v0 = pa[1]; v1 = pa[0];
+ v2 = (v1 >> (32 - off)) | (v0 << off);
+#else /* __XTENSA_EL__ */
+ v0 = pa[0]; v1 = pa[1];
+ v2 = (v0 << (32 - off)) | (v1 >> off);
+#endif
+ pt = (void *)((v1 << (32 - off)) | (v0 >> off));
+ }
+ else
+ pt = *(void**)ptr;
+ pt = __reloc_pointer (pt, map);
+ if (off)
+ {
+ unsigned long v = (unsigned long)pt;
+#ifdef __XTENSA_EB__
+ pa[0] = (v2 << (32 - off)) | (v >> off);
+ pa[1] = (v << (32 - off)) | (v2 >> off);
+#else /* __XTENSA_EL__ */
+ pa[0] = (v2 >> (32 - off)) | (v << off);
+ pa[1] = (v >> (32 - off)) | (v2 << off);
+#endif
+ }
+ else
+ *(void**)ptr = pt;
+ }
+ }
+ p++;
+ }
+ return p;
+}
+
+/* Call __reloc_range_indirect for the given range except for the last
+ entry, whose contents are only relocated. It's expected to hold
+ the GOT value. */
+attribute_hidden void*
+__self_reloc (const struct elf32_fdpic_loadmap *map,
+ void ***p, void ***e)
+{
+ p = reloc_range_indirect (p, e-1, map);
+
+ if (p >= e)
+ return (void*)-1;
+
+ return __reloc_pointer (*p, map);
+}
+
+#endif /* __FDPIC__ */
diff --git a/libc/sysdeps/linux/xtensa/getcontext.S b/libc/sysdeps/linux/xtensa/getcontext.S
new file mode 100644
index 000000000..4cc644552
--- /dev/null
+++ b/libc/sysdeps/linux/xtensa/getcontext.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>
+#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)
+ FDPIC_LOAD_JUMPTARGET (a5, a11, a5)
+ 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..0a8f7116f
--- /dev/null
+++ b/libc/sysdeps/linux/xtensa/makecontext.c
@@ -0,0 +1,184 @@
+/* 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;
+
+#ifdef __FDPIC__
+ ucp->uc_mcontext.sc_pc = ((unsigned long *) __start_context)[0];
+ ucp->uc_mcontext.sc_a[15] = ((unsigned long *) __start_context)[1];
+#else
+ ucp->uc_mcontext.sc_pc = (unsigned long) __start_context;
+#endif
+ 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..72915ef8d
--- /dev/null
+++ b/libc/sysdeps/linux/xtensa/setcontext.S
@@ -0,0 +1,117 @@
+/* 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)
+ FDPIC_LOAD_JUMPTARGET (a5, a11, a5)
+ 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/setjmp.S b/libc/sysdeps/linux/xtensa/setjmp.S
index b8152fdd8..d629c11a8 100644
--- a/libc/sysdeps/linux/xtensa/setjmp.S
+++ b/libc/sysdeps/linux/xtensa/setjmp.S
@@ -155,7 +155,8 @@ ENTRY (__sigsetjmp)
s32i a14, a2, 16
s32i a15, a2, 20
mov a12, a2
- movi a0, __sigjmp_save
+ movi a0, JUMPTARGET(__sigjmp_save)
+ FDPIC_LOAD_JUMPTARGET(a0, a11, a0)
callx0 a0
l32i a0, a12, 0
l32i a12, a12, 8
diff --git a/libc/sysdeps/linux/xtensa/swapcontext.S b/libc/sysdeps/linux/xtensa/swapcontext.S
new file mode 100644
index 000000000..40b38e98c
--- /dev/null
+++ b/libc/sysdeps/linux/xtensa/swapcontext.S
@@ -0,0 +1,174 @@
+/* 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)
+ FDPIC_LOAD_JUMPTARGET (a5, a11, a5)
+ 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..d05741027 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) \
@@ -72,13 +75,27 @@
#define LITERAL_POSITION .literal_position
#undef JUMPTARGET
-#ifdef __PIC__
+#if defined(__FDPIC__)
+#define JUMPTARGET(name) name##@GOTOFFFUNCDESC
+#define FDPIC_LOAD_FUNCDESC(call_target, funcdesc) \
+ l32i a11, funcdesc, 4; \
+ l32i call_target, funcdesc, 0
+
+#define FDPIC_LOAD_JUMPTARGET(call_target, got_base, jumptarget)\
+ add call_target, got_base, jumptarget; \
+ FDPIC_LOAD_FUNCDESC(call_target, call_target)
+
+#elif defined(__PIC__)
/* The "@PLT" suffix is currently a no-op for non-shared linking, but
it doesn't hurt to use it conditionally for PIC code in case that
changes someday. */
#define JUMPTARGET(name) name##@PLT
+#define FDPIC_LOAD_FUNCDESC(call_target, funcdesc)
+#define FDPIC_LOAD_JUMPTARGET(call_target, got_base, jumptarget)
#else
#define JUMPTARGET(name) name
+#define FDPIC_LOAD_FUNCDESC(call_target, funcdesc)
+#define FDPIC_LOAD_JUMPTARGET(call_target, got_base, jumptarget)
#endif
#ifndef FRAMESIZE
@@ -150,6 +167,21 @@
#if defined _LIBC_REENTRANT
# if defined USE___THREAD
+#ifdef __FDPIC__
+# define SYSCALL_ERROR_ERRNO errno
+# define SYSCALL_ERROR_HANDLER \
+0: rur a4, THREADPTR; \
+ movi a3, SYSCALL_ERROR_ERRNO@GOTTPOFF; \
+ .reloc ., R_XTENSA_TLS_TPOFF_PTR, SYSCALL_ERROR_ERRNO; \
+ add a3, a3, a11; \
+ .reloc ., R_XTENSA_TLS_TPOFF_LOAD, SYSCALL_ERROR_ERRNO; \
+ l32i a3, a3, 0; \
+ neg a2, a2; \
+ add a4, a4, a3; \
+ s32i a2, a4, 0; \
+ movi a2, -1; \
+ j .Lpseudo_end;
+#else
# define SYSCALL_ERROR_ERRNO errno
# define SYSCALL_ERROR_HANDLER \
0: rur a4, THREADPTR; \
@@ -159,13 +191,14 @@
s32i a2, a4, 0; \
movi a2, -1; \
j .Lpseudo_end;
+#endif
# else /* !USE___THREAD */
#if defined(__XTENSA_WINDOWED_ABI__)
# define SYSCALL_ERROR_HANDLER \
0: neg a2, a2; \
mov a6, a2; \
- movi a4, __errno_location@PLT; \
+ movi a4, JUMPTARGET(__errno_location); \
callx4 a4; \
s32i a2, a6, 0; \
movi a2, -1; \
@@ -176,7 +209,8 @@
addi a1, a1, -16; \
s32i a0, a1, 0; \
s32i a2, a1, 4; \
- movi a0, __errno_location@PLT; \
+ movi a0, JUMPTARGET(__errno_location); \
+ FDPIC_LOAD_JUMPTARGET(a0, a11, a0); \
callx0 a0; \
l32i a0, a1, 0; \
l32i a3, a1, 4; \
@@ -190,12 +224,23 @@
# endif /* !USE___THREAD */
#else /* !_LIBC_REENTRANT */
+#ifdef __FDPIC__
+#define SYSCALL_ERROR_HANDLER \
+0: movi a4, errno@GOT; \
+ add a4, a4, a11; \
+ l32i a4, a4, 0; \
+ neg a2, a2; \
+ s32i a2, a4, 0; \
+ movi a2, -1; \
+ j .Lpseudo_end;
+#else
#define SYSCALL_ERROR_HANDLER \
0: movi a4, errno; \
neg a2, a2; \
s32i a2, a4, 0; \
movi a2, -1; \
j .Lpseudo_end;
+#endif /* __FDPIC__ */
#endif /* _LIBC_REENTRANT */
#endif /* __ASSEMBLER__ */
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 2.46.0) at 2025-10-31 16:22:24 +0000