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Re: [PATCH] target/sh4: Return error if CPUClass::get_phys_page_debug()
From: |
Philippe Mathieu-Daudé |
Subject: |
Re: [PATCH] target/sh4: Return error if CPUClass::get_phys_page_debug() fails |
Date: |
Thu, 13 May 2021 19:05:38 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 |
Cc'ing qemu-trivial@
On 5/5/21 6:10 PM, Philippe Mathieu-Daudé wrote:
> 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>
> ---
> target/sh4/helper.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/target/sh4/helper.c b/target/sh4/helper.c
> index bd8e034f174..2d622081e85 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)
>