[PUSHED][PATCH v2] gdb: Fix assignment to TYPE_CODE_FLAGS registers

[PUSHED][PATCH v2] gdb: Fix assignment to TYPE_CODE_FLAGS registers

[srinath.parvathaneni]

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Thanks Baris for your review on v1
https://patchwork.sourceware.org/project/gdb/patch/20260713091126.2914903-1-srinath.parvathaneni@arm.com/#236556

There was no specific reason for using gdb_test_multiple here,
I followed the existing tests in aarch64-fpmr.exp.

I've addressed your comments in v2 by switching the newly added
test to gdb_test and removing the unnecessary .*\r\n.* from the
regexp.
----------------

GDB reports "Invalid cast" when assigning small integer literals (32-bit) to
64-bit TYPE_CODE_FLAGS registers. For example, with the existing upstream FPMR
register, set $fpmr = 0x777777777 succeeds, whereas set $fpmr = 0x77 fails with
"Invalid cast" and this patch fixes the issue but makes changes to a generic
function value_cast in gdb/valops.c.

Approved-By: Simon Marchi <simon.marchi@efficios.com>
---
 gdb/testsuite/gdb.arch/aarch64-fpmr.exp | 4 ++++
 gdb/valops.c                            | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)


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diff --git a/gdb/testsuite/gdb.arch/aarch64-fpmr.exp b/gdb/testsuite/gdb.arch/aarch64-fpmr.exp
index 72fd977fc67..aadfb68293e 100644
--- a/gdb/testsuite/gdb.arch/aarch64-fpmr.exp
+++ b/gdb/testsuite/gdb.arch/aarch64-fpmr.exp
@@ -97,3 +97,7 @@ gdb_test_multiple "set \$fpmr=0x3f007f4008" "" {
 	pass "Write to FPMR from GDB"
     }
 }
+
+gdb_test "set \$fpmr=0x1255C041" \
+	 "\\\[ F8S1=E4M3 F8S2=E5M2 F8D=E4M3 OSM=MaxNormal OSC=MaxNormal LSCALE=85 NSCALE=18 LSCALE2=0 \\\]" \
+	 "Write 32-bit value to 64-bit register FPMR"
diff --git a/gdb/valops.c b/gdb/valops.c
index c478bdc3f15..82c796bd254 100644
--- a/gdb/valops.c
+++ b/gdb/valops.c
@@ -562,7 +562,7 @@ value_cast (struct type *type, struct value *arg2)
 	return value_from_longest (to_type, value_as_long (arg2));
     }
   else if ((code1 == TYPE_CODE_INT || code1 == TYPE_CODE_ENUM
-	    || code1 == TYPE_CODE_RANGE)
+	    || code1 == TYPE_CODE_RANGE || code1 == TYPE_CODE_FLAGS)
 	   && (scalar || code2 == TYPE_CODE_PTR
 	       || code2 == TYPE_CODE_MEMBERPTR))
     {