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ArmPkg/ArmSmcLib: Fixed SMC helper functions

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The SMC helper functions were buggy as they were assuming that
the values in x1-x7 registers were preserved across an SMC call,
which is not the case.  This patch fixes this issue.

It also simplifies the code by providing only 1 version of the SMC
helper function.  We used to have 4 versions depending on the number
of arguments.  The problem with this approach was that the number of
arguments also dictated the number of return values, which is
completely unrelated.  E.g. you can have an SMC call that takes
1 argument but returns 4 values.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15748 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Olivier Martin
2014-08-04 14:18:13 +00:00
committed by oliviermartin
parent 9a9dd4e839
commit b4e53e389d
7 changed files with 102 additions and 221 deletions
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14
ArmPkg/Library/ArmSmcLibNull/AArch64/ArmSmcNull.S
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@@ -1,5 +1,5 @@
//
// Copyright (c) 2012-2013, ARM Limited. All rights reserved.
// Copyright (c) 2012-2014, ARM Limited. All rights reserved.
//
// This program and the accompanying materials
// are licensed and made available under the terms and conditions of the BSD License
@@ -15,18 +15,6 @@
.align 3
GCC_ASM_EXPORT(ArmCallSmc)
GCC_ASM_EXPORT(ArmCallSmcArg1)
GCC_ASM_EXPORT(ArmCallSmcArg2)
GCC_ASM_EXPORT(ArmCallSmcArg3)
ASM_PFX(ArmCallSmc):
ret
ASM_PFX(ArmCallSmcArg1):
ret
ASM_PFX(ArmCallSmcArg2):
ret
ASM_PFX(ArmCallSmcArg3):
ret