diff options
Diffstat (limited to 'src/pal/src/arch/arm64/exceptionhelper.S')
| -rw-r--r-- | src/pal/src/arch/arm64/exceptionhelper.S | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/src/pal/src/arch/arm64/exceptionhelper.S b/src/pal/src/arch/arm64/exceptionhelper.S index 4fdcfc5eb1..480846eb61 100644 --- a/src/pal/src/arch/arm64/exceptionhelper.S +++ b/src/pal/src/arch/arm64/exceptionhelper.S @@ -3,7 +3,30 @@ // See the LICENSE file in the project root for more information. #include "unixasmmacros.inc" +#include "asmconstants.h" +////////////////////////////////////////////////////////////////////////// +// +// This function creates a stack frame right below the target frame, restores all callee +// saved registers, SP, and LR from the passed in context. +// Then it uses the ThrowExceptionHelper to throw the passed in exception from that context. +// EXTERN_C void ThrowExceptionFromContextInternal(CONTEXT* context, PAL_SEHException* ex); LEAF_ENTRY ThrowExceptionFromContextInternal, _TEXT - EMIT_BREAKPOINT + // Save the FP & LR to the stack so that the unwind can work at the instruction after + // loading the FP from the context, but before loading the SP from the context. + stp fp, lr, [sp, -16]! + + ldp x19,x20, [x0, #(CONTEXT_X19)] + ldp x21,x22, [x0, #(CONTEXT_X21)] + ldp x23,x24, [x0, #(CONTEXT_X23)] + ldp x24,x25, [x0, #(CONTEXT_X24)] + ldp x26,x27, [x0, #(CONTEXT_X26)] + ldp x28,fp, [x0, #(CONTEXT_X28)] + ldr lr, [x0, #(CONTEXT_Pc)] + ldr x2, [x0, #(CONTEXT_Sp)] + mov sp, x2 + + // The PAL_SEHException pointer + mov x0, x1 + b EXTERNAL_C_FUNC(ThrowExceptionHelper) LEAF_END ThrowExceptionFromContextInternal, _TEXT |