diff options
| author | David Cunado <david.cunado@arm.com> | 2017-10-20 11:30:57 +0100 |
|---|---|---|
| committer | David Cunado <david.cunado@arm.com> | 2017-11-15 22:42:05 +0000 |
| commit | 91089f360aaa38408d96a02136456dbde4f34eaf (patch) | |
| tree | 33301c2c73797b1f5ae3582070e314895d2319e1 /docs/firmware-design.rst | |
| parent | e83769c07bb09b7727a36389c9dd92096860637e (diff) | |
Move FPEXC32_EL2 to FP Context
The FPEXC32_EL2 register controls SIMD and FP functionality when the
lower ELs are executing in AArch32 mode. It is architecturally mapped
to AArch32 system register FPEXC.
This patch removes FPEXC32_EL2 register from the System Register context
and adds it to the floating-point context. EL3 only saves / restores the
floating-point context if the build option CTX_INCLUDE_FPREGS is set to 1.
The rationale for this change is that if the Secure world is using FP
functionality and EL3 is not managing the FP context, then the Secure
world will save / restore the appropriate FP registers.
NOTE - this is a break in behaviour in the unlikely case that
CTX_INCLUDE_FPREGS is set to 0 and the platform contains an AArch32
Secure Payload that modifies FPEXC, but does not save and restore
this register
Change-Id: Iab80abcbfe302752d52b323b4abcc334b585c184
Signed-off-by: David Cunado <david.cunado@arm.com>
Diffstat (limited to 'docs/firmware-design.rst')
| -rw-r--r-- | docs/firmware-design.rst | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/docs/firmware-design.rst b/docs/firmware-design.rst index 7cc19709..c0ece0ba 100644 --- a/docs/firmware-design.rst +++ b/docs/firmware-design.rst @@ -1144,7 +1144,6 @@ The sample crash output is shown below. cntv_ctl_el0 :0x0000000000000000 cntv_cval_el0 :0x0000000000000000 cntkctl_el1 :0x0000000000000000 - fpexc32_el2 :0x0000000004000700 sp_el0 :0x0000000004010780 Guidelines for Reset Handlers |