[PATCH for-7.0 v2] target/mips: Fix address space range declaration on n32

[PATCH for-7.0 v2] target/mips: Fix address space range declaration on n32

[WANG Xuerui]

This bug is probably lurking there for so long, I cannot even git-blame
my way to the commit first introducing it.

Anyway, because n32 is also TARGET_MIPS64, the address space range
cannot be determined by looking at TARGET_MIPS64 alone. Fix this by only
declaring 48-bit address spaces for n64, or the n32 user emulation will
happily hand out memory ranges beyond the 31-bit limit and crash.

Confirmed to make the minimal reproducing example in the linked issue
behave.

Closes: https://gitlab.com/qemu-project/qemu/-/issues/939
Signed-off-by: WANG Xuerui <xen0n@gentoo.org>
Cc: Philippe Mathieu-Daudé <f4bug@amsat.org>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Aleksandar Rikalo <aleksandar.rikalo@syrmia.com>
Tested-by: Andreas K. Huettel <dilfridge@gentoo.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---

v2:
- Collect tags
- Make it clear this patch is for 7.0

 target/mips/cpu-param.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/mips/cpu-param.h b/target/mips/cpu-param.h
index 9c4a6ea45e2..1aebd01df9c 100644
--- a/target/mips/cpu-param.h
+++ b/target/mips/cpu-param.h
@@ -12,7 +12,7 @@
 #else
 # define TARGET_LONG_BITS 32
 #endif
-#ifdef TARGET_MIPS64
+#ifdef TARGET_ABI_MIPSN64
 #define TARGET_PHYS_ADDR_SPACE_BITS 48
 #define TARGET_VIRT_ADDR_SPACE_BITS 48
 #else
-- 
2.35.1

Re: [PATCH for-7.0 v2] target/mips: Fix address space range declaration on n32

[Philippe Mathieu-Daudé]

On 28/3/22 05:59, WANG Xuerui wrote:
> This bug is probably lurking there for so long, I cannot even git-blame
> my way to the commit first introducing it.
> 
> Anyway, because n32 is also TARGET_MIPS64, the address space range
> cannot be determined by looking at TARGET_MIPS64 alone. Fix this by only
> declaring 48-bit address spaces for n64, or the n32 user emulation will
> happily hand out memory ranges beyond the 31-bit limit and crash.
> 
> Confirmed to make the minimal reproducing example in the linked issue
> behave.
> 
> Closes: https://gitlab.com/qemu-project/qemu/-/issues/939
> Signed-off-by: WANG Xuerui <xen0n@gentoo.org>
> Cc: Philippe Mathieu-Daudé <f4bug@amsat.org>
> Cc: Aurelien Jarno <aurelien@aurel32.net>
> Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
> Cc: Aleksandar Rikalo <aleksandar.rikalo@syrmia.com>
> Tested-by: Andreas K. Huettel <dilfridge@gentoo.org>
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
> ---
> 
> v2:
> - Collect tags
> - Make it clear this patch is for 7.0
> 
>   target/mips/cpu-param.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

And queued to mips-fixes, thanks.