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authorPeter Maydell <peter.maydell@linaro.org>2014-02-20 10:35:52 +0000
committerPeter Maydell <peter.maydell@linaro.org>2014-02-20 10:35:52 +0000
commitf59df3f2354982ee0381b87d1ce561f1eb0ed505 (patch)
treedb6f983aec846a0a8a6856b7453c12f2c4997fcb /target-arm/helper.h
parente508a92b621c7160122e99d3754e568f2b8e255e (diff)
target-arm: Split cpreg access checks out from read/write functions
Several of the system registers handled via the ARMCPRegInfo mechanism have access trap control bits controlling whether the registers are accessible to lower privilege levels. Replace the existing mechanism (allowing the read and write functions to return EXCP_UDEF if access is denied) with a dedicated "check access rights" function pointer in the ARMCPRegInfo. This will allow us to simplify some of the register definitions, which no longer need read/write functions purely to handle the access checks. We take the opportunity to define the return value from the access checking function in a way that allows us to set the correct exception syndrome information for exceptions taken to AArch64 (which may need to distinguish access failures due to a configurable trap or enable from other kinds of access failure). This commit defines the new mechanism but does not move any of the registers across to use it. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Diffstat (limited to 'target-arm/helper.h')
-rw-r--r--target-arm/helper.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/target-arm/helper.h b/target-arm/helper.h
index 7c60121b1f..19bd620532 100644
--- a/target-arm/helper.h
+++ b/target-arm/helper.h
@@ -57,6 +57,7 @@ DEF_HELPER_1(cpsr_read, i32, env)
DEF_HELPER_3(v7m_msr, void, env, i32, i32)
DEF_HELPER_2(v7m_mrs, i32, env, i32)
+DEF_HELPER_2(access_check_cp_reg, void, env, ptr)
DEF_HELPER_3(set_cp_reg, void, env, ptr, i32)
DEF_HELPER_2(get_cp_reg, i32, env, ptr)
DEF_HELPER_3(set_cp_reg64, void, env, ptr, i64)