[Stable-9.1.2 26/58] target/arm: Fix arithmetic underflow in SETM instruction

[Michael Tokarev]

From: Ido Plat <ido.plat1@ibm.com>

Pass the stage size to step function callback, otherwise do_setm
would hang when size is larger then page size because stage size
would underflow.  This fix changes do_setm to be more inline with
do_setp.

Cc: qemu-stable@nongnu.org
Fixes: 0e92818887dee ("target/arm: Implement the SET* instructions")
Signed-off-by: Ido Plat <ido.plat1@ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241025024909.799989-1-ido.plat1@ibm.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
(cherry picked from commit bab209af35037b33f7eb1b8a3737085935bec3a3)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/target/arm/tcg/helper-a64.c b/target/arm/tcg/helper-a64.c
index 21a9abd90a..0cd9006e40 100644
--- a/target/arm/tcg/helper-a64.c
+++ b/target/arm/tcg/helper-a64.c
@@ -1348,7 +1348,7 @@ static void do_setm(CPUARMState *env, uint32_t syndrome, 
uint32_t mtedesc,
     /* Do the actual memset: we leave the last partial page to SETE */
     stagesetsize = setsize & TARGET_PAGE_MASK;
     while (stagesetsize > 0) {
-        step = stepfn(env, toaddr, setsize, data, memidx, &mtedesc, ra);
+        step = stepfn(env, toaddr, stagesetsize, data, memidx, &mtedesc, ra);
         toaddr += step;
         setsize -= step;
         stagesetsize -= step;
-- 
2.39.5