Revert contrib/restricted/boost/context to 1.86.0

commit_hash:8f96480a77563db5941dbdc705a2a092cb773a2b

33 files changed, 51 insertions, 98 deletions

diff --git a/contrib/restricted/boost/context/.yandex_meta/devtools.copyrights.report b/contrib/restricted/boost/context/.yandex_meta/devtools.copyrights.report
index 5ab98d2b00..60d046ffec 100644
--- a/contrib/restricted/boost/context/.yandex_meta/devtools.copyrights.report
+++ b/contrib/restricted/boost/context/.yandex_meta/devtools.copyrights.report
@@ -95,16 +95,6 @@ BELONGS ya.make
         src/asm/ontop_x86_64_sysv_macho_gas.S [2:4]
         src/untested.cpp [2:4]
 
-KEEP     COPYRIGHT_SERVICE_LABEL 9ed7b7468c684d33492a4176e9cf31b1
-BELONGS ya.make
-    Note: matched license text is too long. Read it in the source files.
-    Scancode info:
-        Original SPDX id: COPYRIGHT_SERVICE_LABEL
-        Score           : 100.00
-        Match type      : COPYRIGHT
-    Files with this license:
-        src/fcontext.cpp [1:3]
-
 KEEP     COPYRIGHT_SERVICE_LABEL c3ce9643507aa0942a28211fe8f95eff
 BELONGS ya.make
     License text:
diff --git a/contrib/restricted/boost/context/.yandex_meta/devtools.licenses.report b/contrib/restricted/boost/context/.yandex_meta/devtools.licenses.report
index 2259eba708..87fc619612 100644
--- a/contrib/restricted/boost/context/.yandex_meta/devtools.licenses.report
+++ b/contrib/restricted/boost/context/.yandex_meta/devtools.licenses.report
@@ -127,7 +127,6 @@ BELONGS ya.make
         include/boost/context/stack_traits.hpp [3:5]
         include/boost/context/windows/protected_fixedsize_stack.hpp [3:5]
         src/continuation.cpp [3:5]
-        src/fcontext.cpp [2:4]
         src/fiber.cpp [3:5]
         src/posix/stack_traits.cpp [3:5]
         src/untested.cpp [3:5]
diff --git a/contrib/restricted/boost/context/.yandex_meta/licenses.list.txt b/contrib/restricted/boost/context/.yandex_meta/licenses.list.txt
index dbd9323671..6eecddf257 100644
--- a/contrib/restricted/boost/context/.yandex_meta/licenses.list.txt
+++ b/contrib/restricted/boost/context/.yandex_meta/licenses.list.txt
@@ -56,9 +56,3 @@
 //          Copyright Oliver Kowalke 2017.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
-
-
-====================COPYRIGHT====================
-// SPDX-FileCopyrightText: Copyright 2024 Arm Limited and/or its affiliates <open-source-office@arm.com>
-// Distributed under the Boost Software License, Version 1.0.
-//    (See accompanying file LICENSE_1_0.txt or copy at
diff --git a/contrib/restricted/boost/context/fcontext_impl/ya.make b/contrib/restricted/boost/context/fcontext_impl/ya.make
index d0b2bdffa7..da427b0f30 100644
--- a/contrib/restricted/boost/context/fcontext_impl/ya.make
+++ b/contrib/restricted/boost/context/fcontext_impl/ya.make
@@ -4,9 +4,9 @@ LIBRARY()
 
 WITHOUT_LICENSE_TEXTS()
 
-VERSION(1.87.0)
+VERSION(1.86.0)
 
-ORIGINAL_SOURCE(https://github.com/boostorg/context/archive/boost-1.87.0.tar.gz)
+ORIGINAL_SOURCE(https://github.com/boostorg/context/archive/boost-1.86.0.tar.gz)
 
 LICENSE(BSL-1.0)
 
@@ -68,7 +68,6 @@ SRCS(
     src/asm/make_${FCONTEXT_ARCH}_${FCONTEXT_ABI}_${FCONTEXT_FMT}_${FCONTEXT_SUF}
     src/asm/jump_${FCONTEXT_ARCH}_${FCONTEXT_ABI}_${FCONTEXT_FMT}_${FCONTEXT_SUF}
     src/asm/ontop_${FCONTEXT_ARCH}_${FCONTEXT_ABI}_${FCONTEXT_FMT}_${FCONTEXT_SUF}
-    src/fcontext.cpp
 )
 
 END()
diff --git a/contrib/restricted/boost/context/impl_common/ya.make b/contrib/restricted/boost/context/impl_common/ya.make
index 3a9a118a9c..61f7516118 100644
--- a/contrib/restricted/boost/context/impl_common/ya.make
+++ b/contrib/restricted/boost/context/impl_common/ya.make
@@ -4,9 +4,9 @@ LIBRARY()
 
 WITHOUT_LICENSE_TEXTS()
 
-VERSION(1.87.0)
+VERSION(1.86.0)
 
-ORIGINAL_SOURCE(https://github.com/boostorg/context/archive/boost-1.87.0.tar.gz)
+ORIGINAL_SOURCE(https://github.com/boostorg/context/archive/boost-1.86.0.tar.gz)
 
 LICENSE(BSL-1.0)
 
diff --git a/contrib/restricted/boost/context/include/boost/context/detail/fcontext.hpp b/contrib/restricted/boost/context/include/boost/context/detail/fcontext.hpp
index 52be6083af..00cb24d941 100644
--- a/contrib/restricted/boost/context/include/boost/context/detail/fcontext.hpp
+++ b/contrib/restricted/boost/context/include/boost/context/detail/fcontext.hpp
@@ -27,11 +27,14 @@ struct transfer_t {
     void    *   data;
 };
 
-BOOST_CONTEXT_DECL transfer_t jump_fcontext( fcontext_t const to, void * vp);
-BOOST_CONTEXT_DECL fcontext_t make_fcontext( void * sp, std::size_t size, void (* fn)( transfer_t) );
+extern "C" BOOST_CONTEXT_DECL
+transfer_t BOOST_CONTEXT_CALLDECL jump_fcontext( fcontext_t const to, void * vp);
+extern "C" BOOST_CONTEXT_DECL
+fcontext_t BOOST_CONTEXT_CALLDECL make_fcontext( void * sp, std::size_t size, void (* fn)( transfer_t) );
 
 // based on an idea of Giovanni Derreta
-BOOST_CONTEXT_DECL transfer_t ontop_fcontext( fcontext_t const to, void * vp, transfer_t (* fn)( transfer_t) );
+extern "C" BOOST_CONTEXT_DECL
+transfer_t BOOST_CONTEXT_CALLDECL ontop_fcontext( fcontext_t const to, void * vp, transfer_t (* fn)( transfer_t) );
 
 }}}
 
diff --git a/contrib/restricted/boost/context/src/asm/jump_arm64_aapcs_elf_gas.S b/contrib/restricted/boost/context/src/asm/jump_arm64_aapcs_elf_gas.S
index 7c1f075355..cefd1830d7 100644
--- a/contrib/restricted/boost/context/src/asm/jump_arm64_aapcs_elf_gas.S
+++ b/contrib/restricted/boost/context/src/asm/jump_arm64_aapcs_elf_gas.S
@@ -55,7 +55,6 @@
 .text
 .align  2
 .global jump_fcontext
-.hidden jump_fcontext
 .type   jump_fcontext, %function
 jump_fcontext:
     # prepare stack for GP + FPU
diff --git a/contrib/restricted/boost/context/src/asm/jump_arm64_aapcs_macho_gas.S b/contrib/restricted/boost/context/src/asm/jump_arm64_aapcs_macho_gas.S
index 12cc021586..31738f7453 100644
--- a/contrib/restricted/boost/context/src/asm/jump_arm64_aapcs_macho_gas.S
+++ b/contrib/restricted/boost/context/src/asm/jump_arm64_aapcs_macho_gas.S
@@ -52,7 +52,6 @@
  *******************************************************/
 
 .text
-.private_extern _jump_fcontext
 .globl _jump_fcontext
 .balign 16
 _jump_fcontext:
diff --git a/contrib/restricted/boost/context/src/asm/jump_arm_aapcs_elf_gas.S b/contrib/restricted/boost/context/src/asm/jump_arm_aapcs_elf_gas.S
index 9934c0897c..86efe9d821 100644
--- a/contrib/restricted/boost/context/src/asm/jump_arm_aapcs_elf_gas.S
+++ b/contrib/restricted/boost/context/src/asm/jump_arm_aapcs_elf_gas.S
@@ -41,7 +41,6 @@
 .file "jump_arm_aapcs_elf_gas.S"
 .text
 .globl jump_fcontext
-.hidden jump_fcontext
 .align 2
 .type jump_fcontext,%function
 .syntax unified
diff --git a/contrib/restricted/boost/context/src/asm/jump_arm_aapcs_macho_gas.S b/contrib/restricted/boost/context/src/asm/jump_arm_aapcs_macho_gas.S
index 44e7f2a422..077c36409e 100644
--- a/contrib/restricted/boost/context/src/asm/jump_arm_aapcs_macho_gas.S
+++ b/contrib/restricted/boost/context/src/asm/jump_arm_aapcs_macho_gas.S
@@ -39,7 +39,6 @@
  *******************************************************/
 
 .text
-.private_extern _jump_fcontext
 .globl _jump_fcontext
 .align 2
 _jump_fcontext:
diff --git a/contrib/restricted/boost/context/src/asm/jump_i386_sysv_elf_gas.S b/contrib/restricted/boost/context/src/asm/jump_i386_sysv_elf_gas.S
index d00ac4fffd..ed83717ce2 100644
--- a/contrib/restricted/boost/context/src/asm/jump_i386_sysv_elf_gas.S
+++ b/contrib/restricted/boost/context/src/asm/jump_i386_sysv_elf_gas.S
@@ -31,7 +31,6 @@
 .file "jump_i386_sysv_elf_gas.S"
 .text
 .globl jump_fcontext
-.hidden jump_fcontext
 .align 2
 .type jump_fcontext,@function
 jump_fcontext:
diff --git a/contrib/restricted/boost/context/src/asm/jump_i386_sysv_macho_gas.S b/contrib/restricted/boost/context/src/asm/jump_i386_sysv_macho_gas.S
index 12aa702be9..8ab7c6f29c 100644
--- a/contrib/restricted/boost/context/src/asm/jump_i386_sysv_macho_gas.S
+++ b/contrib/restricted/boost/context/src/asm/jump_i386_sysv_macho_gas.S
@@ -25,7 +25,6 @@
  ****************************************************************************************/
 
 .text
-.private_extern _jump_fcontext
 .globl _jump_fcontext
 .align 2
 _jump_fcontext:
diff --git a/contrib/restricted/boost/context/src/asm/jump_x86_64_sysv_elf_gas.S b/contrib/restricted/boost/context/src/asm/jump_x86_64_sysv_elf_gas.S
index 2eff59a380..be264bdc2e 100644
--- a/contrib/restricted/boost/context/src/asm/jump_x86_64_sysv_elf_gas.S
+++ b/contrib/restricted/boost/context/src/asm/jump_x86_64_sysv_elf_gas.S
@@ -44,7 +44,6 @@
 .file "jump_x86_64_sysv_elf_gas.S"
 .text
 .globl jump_fcontext
-.hidden jump_fcontext
 .type jump_fcontext,@function
 .align 16
 jump_fcontext:
@@ -74,6 +73,14 @@ jump_fcontext:
     /* read the current SSP and store it */
     rdsspq  %rcx
     movq  %rcx, (%rsp)
+#endif
+
+#if BOOST_CONTEXT_SHADOW_STACK
+    /* grow the stack to reserve space for shadow stack pointer(SSP) */
+    leaq  -0x8(%rsp), %rsp
+    /* read the current SSP and store it */
+    rdsspq  %rcx
+    movq  %rcx, (%rsp)
 # endif
 
     /* store RSP (pointing to context-data) in RAX */
diff --git a/contrib/restricted/boost/context/src/asm/jump_x86_64_sysv_macho_gas.S b/contrib/restricted/boost/context/src/asm/jump_x86_64_sysv_macho_gas.S
index 673daa61df..afc3e5c126 100644
--- a/contrib/restricted/boost/context/src/asm/jump_x86_64_sysv_macho_gas.S
+++ b/contrib/restricted/boost/context/src/asm/jump_x86_64_sysv_macho_gas.S
@@ -25,7 +25,6 @@
  ****************************************************************************************/
 
 .text
-.private_extern _jump_fcontext
 .globl _jump_fcontext
 .align 8
 _jump_fcontext:
diff --git a/contrib/restricted/boost/context/src/asm/make_arm64_aapcs_elf_gas.S b/contrib/restricted/boost/context/src/asm/make_arm64_aapcs_elf_gas.S
index 8ac825bf54..66cfb2da17 100644
--- a/contrib/restricted/boost/context/src/asm/make_arm64_aapcs_elf_gas.S
+++ b/contrib/restricted/boost/context/src/asm/make_arm64_aapcs_elf_gas.S
@@ -55,7 +55,6 @@
 .text
 .align  2
 .global make_fcontext
-.hidden make_fcontext
 .type   make_fcontext, %function
 make_fcontext:
     # shift address in x0 (allocated stack) to lower 16 byte boundary
diff --git a/contrib/restricted/boost/context/src/asm/make_arm64_aapcs_macho_gas.S b/contrib/restricted/boost/context/src/asm/make_arm64_aapcs_macho_gas.S
index a6a1314c0d..b30b1e3e5b 100644
--- a/contrib/restricted/boost/context/src/asm/make_arm64_aapcs_macho_gas.S
+++ b/contrib/restricted/boost/context/src/asm/make_arm64_aapcs_macho_gas.S
@@ -52,7 +52,6 @@
  *******************************************************/
 
 .text
-.private_extern _make_fcontext
 .globl _make_fcontext
 .balign 16
 
diff --git a/contrib/restricted/boost/context/src/asm/make_arm_aapcs_elf_gas.S b/contrib/restricted/boost/context/src/asm/make_arm_aapcs_elf_gas.S
index 9616e566af..98ae64b43f 100644
--- a/contrib/restricted/boost/context/src/asm/make_arm_aapcs_elf_gas.S
+++ b/contrib/restricted/boost/context/src/asm/make_arm_aapcs_elf_gas.S
@@ -41,7 +41,6 @@
 .file "make_arm_aapcs_elf_gas.S"
 .text
 .globl make_fcontext
-.hidden make_fcontext
 .align 2
 .type make_fcontext,%function
 .syntax unified
diff --git a/contrib/restricted/boost/context/src/asm/make_arm_aapcs_macho_gas.S b/contrib/restricted/boost/context/src/asm/make_arm_aapcs_macho_gas.S
index de934075d2..c909ae9d43 100644
--- a/contrib/restricted/boost/context/src/asm/make_arm_aapcs_macho_gas.S
+++ b/contrib/restricted/boost/context/src/asm/make_arm_aapcs_macho_gas.S
@@ -39,7 +39,6 @@
  *******************************************************/
 
 .text
-.private_extern _make_fcontext
 .globl _make_fcontext
 .align 2
 _make_fcontext:
diff --git a/contrib/restricted/boost/context/src/asm/make_i386_sysv_elf_gas.S b/contrib/restricted/boost/context/src/asm/make_i386_sysv_elf_gas.S
index 992bae019a..c6e0b36558 100644
--- a/contrib/restricted/boost/context/src/asm/make_i386_sysv_elf_gas.S
+++ b/contrib/restricted/boost/context/src/asm/make_i386_sysv_elf_gas.S
@@ -31,7 +31,6 @@
 .file "make_i386_sysv_elf_gas.S"
 .text
 .globl make_fcontext
-.hidden make_fcontext
 .align 2
 .type make_fcontext,@function
 make_fcontext:
diff --git a/contrib/restricted/boost/context/src/asm/make_i386_sysv_macho_gas.S b/contrib/restricted/boost/context/src/asm/make_i386_sysv_macho_gas.S
index a5890d75f6..519e406248 100644
--- a/contrib/restricted/boost/context/src/asm/make_i386_sysv_macho_gas.S
+++ b/contrib/restricted/boost/context/src/asm/make_i386_sysv_macho_gas.S
@@ -25,7 +25,6 @@
  ****************************************************************************************/
 
 .text
-.private_extern _make_fcontext
 .globl _make_fcontext
 .align 2
 _make_fcontext:
diff --git a/contrib/restricted/boost/context/src/asm/make_x86_64_sysv_elf_gas.S b/contrib/restricted/boost/context/src/asm/make_x86_64_sysv_elf_gas.S
index 7561c0896b..b0d0c0341e 100644
--- a/contrib/restricted/boost/context/src/asm/make_x86_64_sysv_elf_gas.S
+++ b/contrib/restricted/boost/context/src/asm/make_x86_64_sysv_elf_gas.S
@@ -44,7 +44,6 @@
 .file "make_x86_64_sysv_elf_gas.S"
 .text
 .globl make_fcontext
-.hidden make_fcontext
 .type make_fcontext,@function
 .align 16
 make_fcontext:
@@ -93,6 +92,35 @@ make_fcontext:
     movq  %rcx, 0x38(%rax)
 
 #if BOOST_CONTEXT_SHADOW_STACK
+    /* Populate the shadow stack and normal stack */
+    /* get original SSP */
+    rdsspq  %r8
+    /* restore new shadow stack */
+    rstorssp  -0x8(%r9)
+    /* save the restore token on the original shadow stack */
+    saveprevssp
+    /* push the address of "jmp trampoline" to the new shadow stack */
+    /* as well as the stack */
+    call  1f
+    jmp  trampoline
+1:
+    /* save address of "jmp trampoline" as return-address */
+    /* for context-function */
+    pop 0x38(%rax)
+    /* Get the new SSP.  */
+    rdsspq  %r9
+    /* restore original shadow stack */
+    rstorssp  -0x8(%r8)
+    /* save the restore token on the new shadow stack.  */
+    saveprevssp
+
+    /* reserve space for the new SSP */
+    leaq  -0x8(%rax), %rax
+    /* save the new SSP to this fcontext */
+    movq  %r9, (%rax)
+#endif
+
+#if BOOST_CONTEXT_SHADOW_STACK
     /* Populate the shadow stack */
 
     /* get original SSP */
diff --git a/contrib/restricted/boost/context/src/asm/make_x86_64_sysv_macho_gas.S b/contrib/restricted/boost/context/src/asm/make_x86_64_sysv_macho_gas.S
index 06357f678a..5d6c5431c5 100644
--- a/contrib/restricted/boost/context/src/asm/make_x86_64_sysv_macho_gas.S
+++ b/contrib/restricted/boost/context/src/asm/make_x86_64_sysv_macho_gas.S
@@ -25,7 +25,6 @@
  ****************************************************************************************/
 
 .text
-.private_extern _make_fcontext
 .globl _make_fcontext
 .align 8
 _make_fcontext:
diff --git a/contrib/restricted/boost/context/src/asm/ontop_arm64_aapcs_elf_gas.S b/contrib/restricted/boost/context/src/asm/ontop_arm64_aapcs_elf_gas.S
index 8e40fc7d36..665ca5a2c1 100644
--- a/contrib/restricted/boost/context/src/asm/ontop_arm64_aapcs_elf_gas.S
+++ b/contrib/restricted/boost/context/src/asm/ontop_arm64_aapcs_elf_gas.S
@@ -55,7 +55,6 @@
 .text
 .align  2
 .global ontop_fcontext
-.hidden ontop_fcontext
 .type   ontop_fcontext, %function
 ontop_fcontext:
     # prepare stack for GP + FPU
diff --git a/contrib/restricted/boost/context/src/asm/ontop_arm64_aapcs_macho_gas.S b/contrib/restricted/boost/context/src/asm/ontop_arm64_aapcs_macho_gas.S
index 8babe47023..a387d06dd2 100644
--- a/contrib/restricted/boost/context/src/asm/ontop_arm64_aapcs_macho_gas.S
+++ b/contrib/restricted/boost/context/src/asm/ontop_arm64_aapcs_macho_gas.S
@@ -52,7 +52,6 @@
  *******************************************************/
 
 .text
-.private_extern _ontop_fcontext
 .global _ontop_fcontext
 .balign 16
 _ontop_fcontext:
diff --git a/contrib/restricted/boost/context/src/asm/ontop_arm_aapcs_elf_gas.S b/contrib/restricted/boost/context/src/asm/ontop_arm_aapcs_elf_gas.S
index 8c6c9020de..59ad5ca9ce 100644
--- a/contrib/restricted/boost/context/src/asm/ontop_arm_aapcs_elf_gas.S
+++ b/contrib/restricted/boost/context/src/asm/ontop_arm_aapcs_elf_gas.S
@@ -41,7 +41,6 @@
 .file "ontop_arm_aapcs_elf_gas.S"
 .text
 .globl ontop_fcontext
-.hidden ontop_fcontext
 .align 2
 .type ontop_fcontext,%function
 .syntax unified
diff --git a/contrib/restricted/boost/context/src/asm/ontop_arm_aapcs_macho_gas.S b/contrib/restricted/boost/context/src/asm/ontop_arm_aapcs_macho_gas.S
index 07e63fb24f..3633aca641 100644
--- a/contrib/restricted/boost/context/src/asm/ontop_arm_aapcs_macho_gas.S
+++ b/contrib/restricted/boost/context/src/asm/ontop_arm_aapcs_macho_gas.S
@@ -39,7 +39,6 @@
  *******************************************************/
 
 .text
-.private_extern _ontop_fcontext
 .globl _ontop_fcontext
 .align 2
 _ontop_fcontext:
diff --git a/contrib/restricted/boost/context/src/asm/ontop_i386_sysv_elf_gas.S b/contrib/restricted/boost/context/src/asm/ontop_i386_sysv_elf_gas.S
index ea7a75b90f..0cb6168fab 100644
--- a/contrib/restricted/boost/context/src/asm/ontop_i386_sysv_elf_gas.S
+++ b/contrib/restricted/boost/context/src/asm/ontop_i386_sysv_elf_gas.S
@@ -24,14 +24,9 @@
  *                                                                                      *
  ****************************************************************************************/
 
-#ifdef __x86_64__
-#include "ontop_x86_64_sysv_elf_gas.S"
-#else
-
 .file "ontop_i386_sysv_elf_gas.S"
 .text
 .globl ontop_fcontext
-.hidden ontop_fcontext
 .align 2
 .type ontop_fcontext,@function
 ontop_fcontext:
@@ -103,5 +98,3 @@ ontop_fcontext:
 
 /* Mark that we don't need executable stack.  */
 .section .note.GNU-stack,"",%progbits
-
-#endif
diff --git a/contrib/restricted/boost/context/src/asm/ontop_i386_sysv_macho_gas.S b/contrib/restricted/boost/context/src/asm/ontop_i386_sysv_macho_gas.S
index c129e8e0c7..3a88372b3a 100644
--- a/contrib/restricted/boost/context/src/asm/ontop_i386_sysv_macho_gas.S
+++ b/contrib/restricted/boost/context/src/asm/ontop_i386_sysv_macho_gas.S
@@ -25,7 +25,6 @@
  ****************************************************************************************/
 
 .text
-.private_extern _ontop_fcontext
 .globl _ontop_fcontext
 .align 2
 _ontop_fcontext:
diff --git a/contrib/restricted/boost/context/src/asm/ontop_x86_64_sysv_elf_gas.S b/contrib/restricted/boost/context/src/asm/ontop_x86_64_sysv_elf_gas.S
index e3e4bdf870..c3892b8ba0 100644
--- a/contrib/restricted/boost/context/src/asm/ontop_x86_64_sysv_elf_gas.S
+++ b/contrib/restricted/boost/context/src/asm/ontop_x86_64_sysv_elf_gas.S
@@ -40,7 +40,6 @@
 .file "ontop_x86_64_sysv_elf_gas.S"
 .text
 .globl ontop_fcontext
-.hidden ontop_fcontext
 .type ontop_fcontext,@function
 .align 16
 ontop_fcontext:
diff --git a/contrib/restricted/boost/context/src/asm/ontop_x86_64_sysv_macho_gas.S b/contrib/restricted/boost/context/src/asm/ontop_x86_64_sysv_macho_gas.S
index 7d15b5ba24..49755c69b0 100644
--- a/contrib/restricted/boost/context/src/asm/ontop_x86_64_sysv_macho_gas.S
+++ b/contrib/restricted/boost/context/src/asm/ontop_x86_64_sysv_macho_gas.S
@@ -25,7 +25,6 @@
  ****************************************************************************************/
 
 .text
-.private_extern _ontop_fcontext
 .globl _ontop_fcontext
 .align 8
 _ontop_fcontext:
diff --git a/contrib/restricted/boost/context/src/fcontext.cpp b/contrib/restricted/boost/context/src/fcontext.cpp
deleted file mode 100644
index 9fe0a4892d..0000000000
--- a/contrib/restricted/boost/context/src/fcontext.cpp
+++ /dev/null
@@ -1,39 +0,0 @@
-// SPDX-FileCopyrightText: Copyright 2024 Arm Limited and/or its affiliates <open-source-office@arm.com>
-// Distributed under the Boost Software License, Version 1.0.
-//    (See accompanying file LICENSE_1_0.txt or copy at
-//          http://www.boost.org/LICENSE_1_0.txt)
-
-// This code wraps the plain C asm symbols into properly
-// namespaced and mangled C++ symbols that are safe to
-// export from a library.
-
-#include <boost/context/detail/fcontext.hpp>
-
-extern "C"
-boost::context::detail::transfer_t BOOST_CONTEXT_CALLDECL jump_fcontext( boost::context::detail::fcontext_t const to, void * vp);
-extern "C"
-boost::context::detail::fcontext_t BOOST_CONTEXT_CALLDECL make_fcontext( void * sp, std::size_t size, void (* fn)( boost::context::detail::transfer_t) );
-
-// based on an idea of Giovanni Derreta
-extern "C"
-boost::context::detail::transfer_t BOOST_CONTEXT_CALLDECL ontop_fcontext( boost::context::detail::fcontext_t const to, void * vp, boost::context::detail::transfer_t (* fn)( boost::context::detail::transfer_t) );
-
-namespace boost {
-namespace context {
-namespace detail {
-
-transfer_t jump_fcontext( fcontext_t const to, void * vp)
-{
-    return ::jump_fcontext(to, vp);
-}
-
-fcontext_t make_fcontext( void * sp, std::size_t size, void (* fn)( transfer_t) )
-{
-    return ::make_fcontext(sp, size, fn);
-}
-
-transfer_t ontop_fcontext( fcontext_t const to, void * vp, transfer_t (* fn)( transfer_t) )
-{
-    return ::ontop_fcontext(to, vp, fn);
-}
-}}}
diff --git a/contrib/restricted/boost/context/ucontext_impl/ya.make b/contrib/restricted/boost/context/ucontext_impl/ya.make
index 8c9ce98e9b..61ba1464c0 100644
--- a/contrib/restricted/boost/context/ucontext_impl/ya.make
+++ b/contrib/restricted/boost/context/ucontext_impl/ya.make
@@ -4,9 +4,9 @@ LIBRARY()
 
 WITHOUT_LICENSE_TEXTS()
 
-VERSION(1.87.0)
+VERSION(1.86.0)
 
-ORIGINAL_SOURCE(https://github.com/boostorg/context/archive/boost-1.87.0.tar.gz)
+ORIGINAL_SOURCE(https://github.com/boostorg/context/archive/boost-1.86.0.tar.gz)
 
 LICENSE(BSL-1.0)
 
diff --git a/contrib/restricted/boost/context/ya.make b/contrib/restricted/boost/context/ya.make
index d3c74aa986..f70cdc034c 100644
--- a/contrib/restricted/boost/context/ya.make
+++ b/contrib/restricted/boost/context/ya.make
@@ -6,9 +6,9 @@ LICENSE(BSL-1.0)
 
 LICENSE_TEXTS(.yandex_meta/licenses.list.txt)
 
-VERSION(1.87.0)
+VERSION(1.86.0)
 
-ORIGINAL_SOURCE(https://github.com/boostorg/context/archive/boost-1.87.0.tar.gz)
+ORIGINAL_SOURCE(https://github.com/boostorg/context/archive/boost-1.86.0.tar.gz)
 
 IF (SANITIZER_TYPE)
     PEERDIR(