diff options
Diffstat (limited to 'ArmPkg/Library/ArmSmcLib/AArch64/ArmSmc.S')
| -rw-r--r-- | ArmPkg/Library/ArmSmcLib/AArch64/ArmSmc.S | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/ArmPkg/Library/ArmSmcLib/AArch64/ArmSmc.S b/ArmPkg/Library/ArmSmcLib/AArch64/ArmSmc.S index f73c98cfc3..46c17674c1 100644 --- a/ArmPkg/Library/ArmSmcLib/AArch64/ArmSmc.S +++ b/ArmPkg/Library/ArmSmcLib/AArch64/ArmSmc.S @@ -17,8 +17,8 @@ GCC_ASM_EXPORT(ArmCallSmc)
ASM_PFX(ArmCallSmc):
- // Push x0 on the stack
- str x0, [sp, #-8]!
+ // Push x0 on the stack - The stack must always be quad-word aligned
+ str x0, [sp, #-16]!
// Load the SMC arguments values into the appropriate registers
ldp x6, x7, [x0, #48]
@@ -29,9 +29,9 @@ ASM_PFX(ArmCallSmc): smc #0
// Pop the ARM_SMC_ARGS structure address from the stack into x9
- ldr x9, [sp], #8
+ ldr x9, [sp], #16
- // Store the SMC returned values into the appropriate registers
+ // Store the SMC returned values into the ARM_SMC_ARGS structure.
// A SMC call can return up to 4 values - we do not need to store back x4-x7.
stp x2, x3, [x9, #16]
stp x0, x1, [x9, #0]
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