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Ring3: All the same.

This commit is contained in:
Mikhail Krichanov 2024-05-31 12:19:10 +03:00
parent f578ba6730
commit 1e216df7f5
1 changed files with 27 additions and 2 deletions
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29
ArmPkg/Library/ArmExceptionLib/AArch64/ExceptionSupport.S
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@ -12,6 +12,8 @@
#include <AsmMacroIoLibV8.h>
#include <Protocol/DebugSupport.h> // for exception type definitions
.cpu cortex-a76
/*
This is the stack constructed by the exception handler (low address to high address).
X0 to FAR makes up the EFI_SYSTEM_CONTEXT for AArch64.
@ -116,7 +118,24 @@ ASM_PFX(ExceptionHandlersStart):
VECTOR_BASE(ExceptionHandlersStart)
#endif
.macro ExceptionEntry, val
.macro ExceptionEntry, val, sp=SPx
//
// Our backtrace and register dump code is written in C and so it requires
// a stack. This makes it difficult to produce meaningful diagnostics when
// the stack pointer has been corrupted. So in such cases (i.e., when taking
// synchronous exceptions), this macro is expanded with \sp set to SP0, in
// which case we switch to the SP_EL0 stack pointer, which has been
// initialized to point to a buffer that has been set aside for this purpose.
//
// Since 'sp' may no longer refer to the stack frame that was active when
// the exception was taken, we may have to switch back and forth between
// SP_EL0 and SP_ELx to record the correct value for SP in the context struct.
//
.ifnc \sp, SPx
msr SPsel, xzr
msr pan, #0
.endif
// Move the stackpointer so we can reach our structure with the str instruction.
sub sp, sp, #(FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE)
@ -138,7 +157,13 @@ VECTOR_BASE(ExceptionHandlersStart)
stp x28, x29, [sp, #0xe0]
add x28, sp, #(GP_CONTEXT_SIZE + FP_CONTEXT_SIZE + SYS_CONTEXT_SIZE)
.ifnc \sp, SPx
msr SPsel, #1
mov x7, sp
msr SPsel, xzr
.else
mov x7, x28
.endif
stp x30, x7, [sp, #0xf0]
@ -179,7 +204,7 @@ ASM_PFX(SErrorSP0):
//
VECTOR_ENTRY(ExceptionHandlersStart, ARM_VECTOR_CUR_SPX_SYNC)
ASM_PFX(SynchronousExceptionSPx):
ExceptionEntry EXCEPT_AARCH64_SYNCHRONOUS_EXCEPTIONS
ExceptionEntry EXCEPT_AARCH64_SYNCHRONOUS_EXCEPTIONS, SP0
VECTOR_ENTRY(ExceptionHandlersStart, ARM_VECTOR_CUR_SPX_IRQ)
ASM_PFX(IrqSPx):