update sources to v12.2.3

[ceph.git] / ceph / src / boost / libs / context / src / asm / make_x86_64_sysv_elf_gas.S

diff --git a/ceph/src/boost/libs/context/src/asm/make_x86_64_sysv_elf_gas.S b/ceph/src/boost/libs/context/src/asm/make_x86_64_sysv_elf_gas.S
index ca0da327c34dcbbea4b859047a3eeeaac30cc0e3..25a0c00177fc90ab09f0628abb731ac2d14c6ce3 100644 (file)
--- a/ceph/src/boost/libs/context/src/asm/make_x86_64_sysv_elf_gas.S
+++ b/ceph/src/boost/libs/context/src/asm/make_x86_64_sysv_elf_gas.S
@@ -12,14 +12,14 @@
  *  ----------------------------------------------------------------------------------  *
  *  |   0x0   |   0x4   |   0x8   |   0xc   |   0x10   |   0x14  |   0x18  |   0x1c  |  *
  *  ----------------------------------------------------------------------------------  *
- *  |        R12        |         R13       |         R14        |        R15        |  *
+ *  | fc_mxcsr|fc_x87_cw|        R12        |         R13        |        R14        |  *
  *  ----------------------------------------------------------------------------------  *
  *  ----------------------------------------------------------------------------------  *
  *  |    8    |    9    |   10    |   11    |    12    |    13   |    14   |    15   |  *
  *  ----------------------------------------------------------------------------------  *
  *  |   0x20  |   0x24  |   0x28  |  0x2c   |   0x30   |   0x34  |   0x38  |   0x3c  |  *
  *  ----------------------------------------------------------------------------------  *
- *  |        RBX        |         RBP       |         RIP        |       EXIT        |  *
+ *  |        R15        |        RBX        |         RBP        |        RIP        |  *
  *  ----------------------------------------------------------------------------------  *
  *                                                                                      *
  ****************************************************************************************/
@@ -40,16 +40,35 @@ make_fcontext:
     leaq  -0x40(%rax), %rax
 
     /* third arg of make_fcontext() == address of context-function */
-    movq  %rdx, 0x30(%rax)
+    /* stored in RBX */
+    movq  %rdx, 0x28(%rax)
+
+    /* save MMX control- and status-word */
+    stmxcsr  (%rax)
+    /* save x87 control-word */
+    fnstcw   0x4(%rax)
+
+    /* compute abs address of label trampoline */
+    leaq  trampoline(%rip), %rcx
+    /* save address of trampoline as return-address for context-function */
+    /* will be entered after calling jump_fcontext() first time */
+    movq  %rcx, 0x38(%rax)
 
     /* compute abs address of label finish */
     leaq  finish(%rip), %rcx
     /* save address of finish as return-address for context-function */
     /* will be entered after context-function returns */
-    movq  %rcx, 0x38(%rax)
+    movq  %rcx, 0x30(%rax)
 
     ret /* return pointer to context-data */
 
+trampoline:
+    /* store return address on stack */
+    /* fix stack alignment */
+    push %rbp
+    /* jump to context-function */
+    jmp *%rbx
+
 finish:
     /* exit code is zero */
     xorq  %rdi, %rdi