https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95411
Bug ID: 95411
Summary: Program compiled with nostdlib crashes if passing
double to variadic function
Product: gcc
Version: 9.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: gcc at namandixit dot net
Target Milestone: ---
Created attachment 48632
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48632&action=edit
Sample program to demonstrate the crash
When compiling a sample program (attached) using the command "gcc -g3 -nostdlib
-ffreestanding -lgcc a.c", if a double is passed to a variadic function, the
program crashes while entering that particular function.
In the attached program, the function `add` is called with a variadic arguement
of type double. When the program enters the function `add`, it executes the
instruction "movaps XMMWORD PTR [rbp-0x70],xmm1" and crashes with SIGSEGV.
$ gcc --version
gcc (GCC) 9.3.1 20200408 (Red Hat 9.3.1-2)
$ uname -a
Linux fedora 5.6.7-200.fc31.x86_64 #1 SMP Thu Apr 23 14:22:57 UTC 2020 x86_64
x86_64 x86_64 GNU/Linux
