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[PULL,14/16] target/sh4: Return error if CPUClass::get_phys_page_debug() fails

Message ID 20210515100335.1245468-15-laurent@vivier.eu
State New
Headers show
Series [PULL,01/16] backends/tpm: Replace qemu_mutex_lock calls with QEMU_LOCK_GUARD | expand

Commit Message

Laurent Vivier May 15, 2021, 10:03 a.m. UTC 
From: Philippe Mathieu-Daudé <f4bug@amsat.org>

If the get_physical_address() call fails, the SH4 get_phys_page_debug()
handler returns an uninitialized address. Instead return -1, which
correspond to "no page found" (see cpu_get_phys_page_debug() doc
string).

This fixes a warning emitted when building with CFLAGS=-O3
(using GCC 10.2.1 20201125):

  target/sh4/helper.c: In function ‘superh_cpu_get_phys_page_debug’:
  target/sh4/helper.c:446:12: warning: ‘physical’ may be used uninitialized in this function [-Wmaybe-uninitialized]
    446 |     return physical;
        |            ^~~~~~~~

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Message-Id: <20210505161046.1397608-1-f4bug@amsat.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
 target/sh4/helper.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
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Patch

diff --git a/target/sh4/helper.c b/target/sh4/helper.c
index bd8e034f174d..2d622081e85a 100644
--- a/target/sh4/helper.c
+++ b/target/sh4/helper.c
@@ -441,9 +441,12 @@  hwaddr superh_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
     target_ulong physical;
     int prot;
 
-    get_physical_address(&cpu->env, &physical, &prot, addr, MMU_DATA_LOAD);
+    if (get_physical_address(&cpu->env, &physical, &prot, addr, MMU_DATA_LOAD)
+            == MMU_OK) {
+        return physical;
+    }
 
-    return physical;
+    return -1;
 }
 
 void cpu_load_tlb(CPUSH4State * env)