[Stable-8.2.9 03/45] hw/intc/loongarch_extioi: Use set_bit32() and clear_bit32() for s->isr

[Michael Tokarev]

In extioi_setirq() we try to operate on a bit array stored as an
array of uint32_t using the set_bit() and clear_bit() functions
by casting the pointer to 'unsigned long *'.
This has two problems:
 * the alignment of 'uint32_t' is less than that of 'unsigned long'
   so we pass an insufficiently aligned pointer, which is
   undefined behaviour
 * on big-endian hosts the 64-bit 'unsigned long' will have
   its two halves the wrong way around, and we will produce
   incorrect results

The undefined behaviour is shown by the clang undefined-behaviour
sanitizer when running the loongarch64-virt functional test:

/mnt/nvmedisk/linaro/qemu-from-laptop/qemu/include/qemu/bitops.h:41:5: runtime 
error: store to misaligned address 0x555559745d9c for type 'unsigned long', 
which requires 8 byte alignment
0x555559745d9c: note: pointer points here
  ff ff ff ff 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 
00 00 00 00 00 00 00
              ^
    #0 0x555556fb81c4 in set_bit 
/mnt/nvmedisk/linaro/qemu-from-laptop/qemu/include/qemu/bitops.h:41:9
    #1 0x555556fb81c4 in extioi_setirq 
/mnt/nvmedisk/linaro/qemu-from-laptop/qemu/build/clang/../../hw/intc/loongarch_extioi.c:65:9
    #2 0x555556fb6e90 in pch_pic_irq_handler 
/mnt/nvmedisk/linaro/qemu-from-laptop/qemu/build/clang/../../hw/intc/loongarch_pch_pic.c:75:5
    #3 0x555556710265 in serial_ioport_write 
/mnt/nvmedisk/linaro/qemu-from-laptop/qemu/build/clang/../../hw/char/serial.c

Fix these problems by using set_bit32() and clear_bit32(),
which work with bit arrays stored as an array of uint32_t.

Cc: qemu-stable@nongnu.org
Fixes: cbff2db1e92f8759 ("hw/intc: Add LoongArch extioi interrupt 
controller(EIOINTC)")
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Message-id: 20241108135514.4006953-4-peter.maydell@linaro.org
(cherry picked from commit 335be5bc44aa6800a9e3ba5859ea3833cfe5a7bc)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
(Mjt: drop hunk in hw/intc/loongarch_extioi.c:extioi_update_sw_coremap()
 due to missing v8.2.0-548-g428a6ef4396a "hw/intc/loongarch_extioi: Add vmstate 
post_load support")

diff --git a/hw/intc/loongarch_extioi.c b/hw/intc/loongarch_extioi.c
index 24fb3af8cc..332286be5b 100644
--- a/hw/intc/loongarch_extioi.c
+++ b/hw/intc/loongarch_extioi.c
@@ -56,14 +56,9 @@ static void extioi_setirq(void *opaque, int irq, int level)
     LoongArchExtIOI *s = LOONGARCH_EXTIOI(opaque);
     trace_loongarch_extioi_setirq(irq, level);
     if (level) {
-        /*
-         * s->isr should be used in vmstate structure,
-         * but it not support 'unsigned long',
-         * so we have to switch it.
-         */
-        set_bit(irq, (unsigned long *)s->isr);
+        set_bit32(irq, s->isr);
     } else {
-        clear_bit(irq, (unsigned long *)s->isr);
+        clear_bit32(irq, s->isr);
     }
     extioi_update_irq(s, irq, level);
 }
-- 
2.39.5