[binutils-gdb] gdb/arm: Fetch initial sp value prior to compare

[binutils-gdb] gdb/arm: Fetch initial sp value prior to compare

[Yvan Roux]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=fe642a5b1411502000af9d169122522065dff9ca

commit fe642a5b1411502000af9d169122522065dff9ca
Author: Yvan Roux <yvan.roux@foss.st.com>
Date:   Wed Jun 15 16:00:34 2022 +0200

    gdb/arm: Fetch initial sp value prior to compare
    
    For Arm Cortex-M33 with security extensions, there are 4 different
    stack pointers (msp_s, msp_ns, psp_s, psp_ns).  In order to
    identify the active one, compare the values of the different
    stacks. The value of the initial sp register needs to be fetched to
    perform this comparison.
    
    Signed-off-by: Torbjörn SVENSSON <torbjorn.svensson@foss.st.com>
    Signed-off-by: Yvan Roux <yvan.roux@foss.st.com>

Diff:
---
 gdb/arm-tdep.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
index fe62617d4bf..7c36133a091 100644
--- a/gdb/arm-tdep.c
+++ b/gdb/arm-tdep.c
@@ -341,6 +341,7 @@ arm_cache_init (struct arm_prologue_cache *cache, struct frame_info *frame)
   arm_gdbarch_tdep *tdep = (arm_gdbarch_tdep *) gdbarch_tdep (gdbarch);
 
   arm_cache_init (cache, gdbarch);
+  cache->sp = get_frame_register_unsigned (frame, ARM_SP_REGNUM);
 
   if (tdep->have_sec_ext)
     {