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Diffstat (limited to 'src/vm/amd64/unixasmhelpers.S')
| -rw-r--r-- | src/vm/amd64/unixasmhelpers.S | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/src/vm/amd64/unixasmhelpers.S b/src/vm/amd64/unixasmhelpers.S new file mode 100644 index 0000000000..3cf69fb649 --- /dev/null +++ b/src/vm/amd64/unixasmhelpers.S @@ -0,0 +1,231 @@ +// Licensed to the .NET Foundation under one or more agreements. +// The .NET Foundation licenses this file to you under the MIT license. +// See the LICENSE file in the project root for more information. + +.intel_syntax noprefix +#include "unixasmmacros.inc" +#include "asmconstants.h" + + +////////////////////////////////////////////////////////////////////////// +// +// PrecodeFixupThunk +// +// The call in fixup precode initally points to this function. +// The pupose of this function is to load the MethodDesc and forward the call the prestub. +// +// EXTERN_C VOID __stdcall PrecodeFixupThunk() +LEAF_ENTRY PrecodeFixupThunk, _TEXT + + pop rax // Pop the return address. It points right after the call instruction in the precode. + + // Inline computation done by FixupPrecode::GetMethodDesc() + movzx r10,byte ptr [rax+2] // m_PrecodeChunkIndex + movzx r11,byte ptr [rax+1] // m_MethodDescChunkIndex + mov rax,qword ptr [rax+r10*8+3] + lea METHODDESC_REGISTER,[rax+r11*8] + + // Tail call to prestub + jmp C_FUNC(ThePreStub) + +LEAF_END PrecodeFixupThunk, _TEXT + +// EXTERN_C int __fastcall HelperMethodFrameRestoreState( +// INDEBUG_COMMA(HelperMethodFrame *pFrame) +// MachState *pState +// ) +LEAF_ENTRY HelperMethodFrameRestoreState, _TEXT + +#ifdef _DEBUG + mov rdi, rsi +#endif + + // Check if the MachState is valid + xor eax, eax + cmp qword ptr [rdi + OFFSETOF__MachState___pRetAddr], rax + jne DoRestore + REPRET +DoRestore: + + // + // If a preserved register were pushed onto the stack between + // the managed caller and the H_M_F, m_pReg will point to its + // location on the stack and it would have been updated on the + // stack by the GC already and it will be popped back into the + // appropriate register when the appropriate epilog is run. + // + // Otherwise, the register is preserved across all the code + // in this HCALL or FCALL, so we need to update those registers + // here because the GC will have updated our copies in the + // frame. + // + // So, if m_pReg points into the MachState, we need to update + // the register here. That's what this macro does. + // +#define RestoreReg(reg, regnum) \ + lea rax, [rdi + OFFSETOF__MachState__m_Capture + 8 * regnum]; \ + mov rdx, [rdi + OFFSETOF__MachState__m_Ptrs + 8 * regnum]; \ + cmp rax, rdx; \ + cmove reg, [rax]; + + // regnum has to match ENUM_CALLEE_SAVED_REGISTERS macro + RestoreReg(R12, 0) + RestoreReg(R13, 1) + RestoreReg(R14, 2) + RestoreReg(R15, 3) + RestoreReg(Rbx, 4) + RestoreReg(Rbp, 5) + + xor eax, eax + ret + +LEAF_END HelperMethodFrameRestoreState, _TEXT + +////////////////////////////////////////////////////////////////////////// +// +// NDirectImportThunk +// +// In addition to being called by the EE, this function can be called +// directly from code generated by JIT64 for CRT optimized direct +// P/Invoke calls. If it is modified, the JIT64 compiler's code +// generation will need to altered accordingly. +// +// EXTERN_C VOID __stdcall NDirectImportThunk()// +NESTED_ENTRY NDirectImportThunk, _TEXT, NoHandler + + // + // Save integer parameter registers. + // Make sure to preserve r11 as well as it is used to pass the stack argument size from JIT + // + PUSH_ARGUMENT_REGISTERS + push_register r11 + + // + // Allocate space for XMM parameter registers + // + alloc_stack 0x80 + + SAVE_FLOAT_ARGUMENT_REGISTERS 0 + + END_PROLOGUE + + // + // Call NDirectImportWorker w/ the NDirectMethodDesc* + // + mov rdi, METHODDESC_REGISTER + call C_FUNC(NDirectImportWorker) + + RESTORE_FLOAT_ARGUMENT_REGISTERS 0 + + // + // epilogue, rax contains the native target address + // + free_stack 0x80 + + // + // Restore integer parameter registers and r11 + // + pop_register r11 + POP_ARGUMENT_REGISTERS + + TAILJMP_RAX +NESTED_END NDirectImportThunk, _TEXT + +// EXTERN_C void moveOWord(LPVOID* src, LPVOID* target); +// <NOTE> +// MOVDQA is not an atomic operation. You need to call this function in a crst. +// </NOTE> +LEAF_ENTRY moveOWord, _TEXT + movdqu xmm0, xmmword ptr [rdi] + movdqu xmmword ptr [rsi], xmm0 + + ret +LEAF_END moveOWord, _TEXT + +//------------------------------------------------ +// JIT_RareDisableHelper +// +// The JIT expects this helper to preserve registers used for return values +// +NESTED_ENTRY JIT_RareDisableHelper, _TEXT, NoHandler + + // First integer return register + push_register rax + // Second integer return register + push_register rdx + alloc_stack 0x28 + END_PROLOGUE + // First float return register + movdqa xmmword ptr [rsp], xmm0 + // Second float return register + movdqa xmmword ptr [rsp+0x10], xmm1 + + call C_FUNC(JIT_RareDisableHelperWorker) + + movdqa xmm0, xmmword ptr [rsp] + movdqa xmm1, xmmword ptr [rsp+0x10] + free_stack 0x28 + pop_register rdx + pop_register rax + ret + +NESTED_END JIT_RareDisableHelper, _TEXT + +#ifdef FEATURE_HIJACK + +//------------------------------------------------ +// OnHijackTripThread +// +NESTED_ENTRY OnHijackTripThread, _TEXT, NoHandler + + // Make room for the real return address (rip) + push_register rax + + PUSH_CALLEE_SAVED_REGISTERS + + push_register rdx + // Push rax again - this is where integer/pointer return values are returned + push_register rax + + mov rdi, rsp + + alloc_stack 0x28 + + // First float return register + movdqa [rsp], xmm0 + // Second float return register + movdqa [rsp+0x10], xmm1 + + END_PROLOGUE + + call C_FUNC(OnHijackWorker) + + movdqa xmm0, [rsp] + movdqa xmm1, [rsp+0x10] + free_stack 0x28 + pop_register rax + pop_register rdx + + POP_CALLEE_SAVED_REGISTERS + ret + +NESTED_END OnHijackTripThread, _TEXT + +#endif // FEATURE_HIJACK + +LEAF_ENTRY SinglecastDelegateInvokeStub, _TEXT + + test rdi, rdi + jz NullObject + + + mov rax, [rdi + OFFSETOF__DelegateObject___methodPtr] + mov rdi, [rdi + OFFSETOF__DelegateObject___target] // replace "this" pointer + + jmp rax + +NullObject: + mov rdi, CORINFO_NullReferenceException_ASM + jmp C_FUNC(JIT_InternalThrow) + +LEAF_END SinglecastDelegateInvokeStub, _TEXT |