#2241: apply lib/context/src/context/asm hotfix changes

Author: stmcgovern

lib/context/src/context/asm/jump_ppc64_sysv_elf_gas.S

@@ -97,7 +97,7 @@ jump_fcontext:
 # endif
 #endif
     # reserve space on stack
-    subi  %r1, %r1, 184
+    subi  %r1, %r1, 192
 
 #if _CALL_ELF != 2
     std  %r2,  0(%r1)  # save TOC
@@ -123,6 +123,7 @@ jump_fcontext:
 #if _CALL_ELF != 2
     std  %r3,  152(%r1)  # save hidden
 #endif
+    stfd  %f31, 184(%r1)  # save F31
 
     # save CR
     mfcr  %r0
@@ -166,6 +167,7 @@ jump_fcontext:
 #if _CALL_ELF != 2
     ld  %r3,  152(%r1)  # restore hidden
 #endif
+    lfd  %f31, 184(%r1)  # restore F31
 
     # restore CR
     ld  %r0, 160(%r1)
@@ -180,7 +182,7 @@ jump_fcontext:
     mtctr  %r12
 
     # adjust stack
-    addi  %r1, %r1, 184
+    addi  %r1, %r1, 192
 
 #if _CALL_ELF == 2
     # copy transfer_t into transfer_fn arg registers

lib/context/src/context/asm/make_ppc64_sysv_elf_gas.S

@@ -105,7 +105,7 @@ make_fcontext:
 
     # reserve space for context-data on context-stack
     # including 64 byte of linkage + parameter area (R1 % 16 == 0)
-    subi  %r3, %r3, 248
+    subi  %r3, %r3, 256
 
     # third arg of make_fcontext() == address of context-function
     # entry point (ELFv2) or descriptor (ELFv1)
@@ -123,7 +123,7 @@ make_fcontext:
 
     # set back-chain to zero
     li   %r0, 0
-    std  %r0, 184(%r3)
+    std  %r0, 192(%r3)
 
 #if _CALL_ELF != 2
     # zero in r3 indicates first jump to context-function

lib/context/src/context/asm/ontop_ppc64_sysv_elf_gas.S

@@ -97,7 +97,7 @@ ontop_fcontext:
 # endif
 #endif
     # reserve space on stack
-    subi  %r1, %r1, 184
+    subi  %r1, %r1, 192
 
 #if _CALL_ELF != 2
     std  %r2,  0(%r1)  # save TOC
@@ -123,6 +123,7 @@ ontop_fcontext:
 #if _CALL_ELF != 2
     std  %r3,  152(%r1)  # save hidden
 #endif
+    stfd  %f31, 184(%r1)  # save F31
 
     # save CR
     mfcr  %r0
@@ -165,6 +166,7 @@ ontop_fcontext:
 #if _CALL_ELF != 2
     ld  %r3,  152(%r1)  # restore hidden
 #endif
+    lfd  %f31, 184(%r1)  # restore F31
 
     # restore CR
     ld  %r0, 160(%r1)
@@ -203,7 +205,7 @@ return_to_ctx:
     mtlr  %r0
 
     # adjust stack
-    addi  %r1, %r1, 184
+    addi  %r1, %r1, 192
 
     # jump to context
     bctr