| commit | f9ac778898cb28307e0f91421aba34d43c34b679 | |
| author | Zhuojia Shen <chaosdefinition@hotmail.com> | |
| Tue, 6 Jun 2023 09:19:40 +0000 (6 10:19 +0100) | ||
| committer | Peter Maydell <peter.maydell@linaro.org> | |
| Tue, 6 Jun 2023 09:19:40 +0000 (6 10:19 +0100) | ||
| tree | bb19b404245559a155a6269198417c6dd633250b | treesnapshot (tar.gz zip) |
| parent | c81e4ab370e858550852b052f689a0a721b879d4 | commitdiff |
target/arm: trap DCC access in user mode emulation
Accessing EL0-accessible Debug Communication Channel (DCC) registers in
user mode emulation is currently enabled. However, it does not match
Linux behavior as Linux sets MDSCR_EL1.TDCC on startup to disable EL0
access to DCC (see __cpu_setup() in arch/arm64/mm/proc.S).
This patch fixes access_tdcc() to check MDSCR_EL1.TDCC for EL0 and sets
MDSCR_EL1.TDCC for user mode emulation to match Linux.
Signed-off-by: Zhuojia Shen <chaosdefinition@hotmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: DS7PR12MB630905198DD8E69F6817544CAC4EA@DS7PR12MB6309.namprd12.prod.outlook.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Accessing EL0-accessible Debug Communication Channel (DCC) registers in
user mode emulation is currently enabled. However, it does not match
Linux behavior as Linux sets MDSCR_EL1.TDCC on startup to disable EL0
access to DCC (see __cpu_setup() in arch/arm64/mm/proc.S).
This patch fixes access_tdcc() to check MDSCR_EL1.TDCC for EL0 and sets
MDSCR_EL1.TDCC for user mode emulation to match Linux.
Signed-off-by: Zhuojia Shen <chaosdefinition@hotmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: DS7PR12MB630905198DD8E69F6817544CAC4EA@DS7PR12MB6309.namprd12.prod.outlook.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
| target/arm/cpu.c | diffblobblamehistory | |
| target/arm/debug_helper.c | diffblobblamehistory |