Remove deprecated use of ldm/stm in ARM setjmp.

ARM deprecates using the SP register in the register lists for ldm
and stm, which LLVM emits a warning for.

Bug: http://b/25017080
Change-Id: Ib427e3dfd5740e251f1ad91ebb66534e0d7b72a9

diff --git a/libc/arch-arm/bionic/setjmp.S b/libc/arch-arm/bionic/setjmp.S
index a119529..464f7d8 100644 (file)
--- a/libc/arch-arm/bionic/setjmp.S
+++ b/libc/arch-arm/bionic/setjmp.S
@@ -151,7 +151,10 @@ ENTRY(sigsetjmp)
   // Save core registers.
   add r1, r0, #(_JB_CORE_BASE * 4)
   m_mangle_registers r2
-  stmia r1, {r4-r14}
+
+  // ARM deprecates using sp in the register list for stmia.
+  stmia r1, {r4-r12, lr}
+  str sp, [r1, #(10 * 4)]
   m_unmangle_registers r2
 
   // Save floating-point registers.
@@ -204,7 +207,10 @@ ENTRY(siglongjmp)
   ldr r3, [r0, #(_JB_SIGFLAG * 4)]
   bic r3, r3, #1
   add r2, r0, #(_JB_CORE_BASE * 4)
-  ldmia r2, {r4-r14}
+
+  // ARM deprecates using sp in the register list for ldmia.
+  ldmia r2, {r4-r12, lr}
+  ldr sp, [r2, #(10 * 4)]
   m_unmangle_registers r3
 
   // Save the return value/address and check the setjmp cookie.