commit 022f5af61bc3cbfa2b74ab355b0d2d30b3dab027

Author: Khem Raj <raj.khem@gmail.com>

Date:   Sat Dec 22 15:28:40 2018 -0800

    tests/amd64: Do not clobber %rsp register

    This is seen with gcc-9.0 compiler now which is fix that gcc community

    did recently

    https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52813

    Signed-off-by: Khem Raj <raj.khem@gmail.com>

diff --git a/none/tests/amd64-linux/bug345887.c b/none/tests/amd64-linux/bug345887.c

index 0f9237d..269bd70 100644

--- a/none/tests/amd64-linux/bug345887.c

+++ b/none/tests/amd64-linux/bug345887.c

@@ -20,13 +20,17 @@ static void inner(void)

       "movq $0x10d, %%r14\n"

       "movq $0x10e, %%r15\n"

       // not %rbp as mdb is then not able to reconstruct stack trace

+      // Do change %rsp (to test a bogus stack pointer),

+      // but don't add %rsp to the clobber list since gcc ignores it

+      // and since gcc >= 9.0 errors about it

+      // see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52813

       "movq $0x10f, %%rsp\n"

       "movq $0x1234, (%%rax)\n"  // should cause SEGV here

       "ud2"                      // should never get here

       : // no output registers

       : // no input registers

       : "memory", "%rax", "%rbx", "%rcx", "%rdx", "%rsi", "%rdi",

-        "%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15", "%rsp");

+        "%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15");

 }

 __attribute__((noinline))