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125 lines
3.9 KiB
C++
125 lines
3.9 KiB
C++
#include "platform_macro.h"
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#if defined(TARGET_ARCH_ARM64)
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#include "dobby_internal.h"
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#include "core/modules/assembler/assembler-arm64.h"
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#include "core/modules/codegen/codegen-arm64.h"
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#include "InstructionRelocation/arm64/ARM64InstructionRelocation.h"
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#include "MemoryAllocator/NearMemoryArena.h"
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#include "InterceptRouting/RoutingPlugin/RoutingPlugin.h"
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using namespace zz::arm64;
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CodeBufferBase *GenerateNormalTrampolineBuffer(addr_t from, addr_t to) {
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TurboAssembler turbo_assembler_((void *)from);
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#define _ turbo_assembler_.
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uint64_t distance = llabs((int64_t)(from - to));
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uint64_t adrp_range = ((uint64_t)1 << (2 + 19 + 12 - 1));
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if (distance < adrp_range) {
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// adrp, add, br
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_ AdrpAdd(TMP_REG_0, from, to);
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_ br(TMP_REG_0);
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DLOG(0, "Trampoline use [Adrp, Add, Br] combine");
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} else {
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// ldr, br, branch-address
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CodeGen codegen(&turbo_assembler_);
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codegen.LiteralLdrBranch((uint64_t)to);
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DLOG(0, "Trampoline use [Ldr, Br, Label] combine");
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}
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CodeBufferBase *result = NULL;
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result = turbo_assembler_.GetCodeBuffer()->Copy();
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return result;
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}
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#define ARM64_B_XXX_RANGE ((1 << 25) << 2) // signed
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// If BranchType is B_Branch and the branch_range of `B` is not enough, build the transfer to forward the b branch, if
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static AssemblyCodeChunk *GenerateFastForwardTrampoline(addr_t source_address, addr_t target_address) {
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AssemblyCodeChunk *cchunk = NULL;
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TurboAssembler turbo_assembler_(0);
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// Use adrp + add branch
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cchunk = NearMemoryArena::AllocateCodeChunk((addr_t)source_address, ARM64_B_XXX_RANGE, 3 * 4);
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if (cchunk == nullptr) {
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ERROR_LOG("Can't found near code chunk");
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return NULL;
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}
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// Use adrp + add branch
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uint64_t distance = llabs((int64_t)((addr_t)cchunk->address - target_address));
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uint64_t adrp_range = ((uint64_t)1 << (2 + 19 + 12 - 1));
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if (distance < adrp_range) { // Use adrp + add branch == (3 * 4) trampoline size
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_ AdrpAdd(TMP_REG_0, (addr_t)cchunk->address, target_address);
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_ br(TMP_REG_0);
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DLOG(0, "Forward Trampoline use [Adrp, Add, Br] combine");
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} else {
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delete cchunk;
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cchunk = NULL;
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}
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// Use absolute branch
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if (cchunk == NULL) {
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#if 0
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// Use literal ldr == (4 * 4) trampoline size
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CodeGen codegen(&turbo_assembler_);
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// forward trampoline => target address
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codegen.LiteralLdrBranch(target_address);
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DLOG(0, "Forward Trampoline use [Ldr, Br, Label] combine");
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#else
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// Use mov + br == (4 * 5) trampoline size
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#define _ turbo_assembler_.
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_ Mov(TMP_REG_0, target_address);
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_ br(TMP_REG_0);
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DLOG(0, "Forward Trampoline use [Mov, Br] combine");
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#endif
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size_t tramp_size = turbo_assembler_.GetCodeBuffer()->getSize();
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cchunk = NearMemoryArena::AllocateCodeChunk((addr_t)source_address, ARM64_B_XXX_RANGE, tramp_size);
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if (cchunk == nullptr) {
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ERROR_LOG("Can't found near code chunk");
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return NULL;
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}
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}
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turbo_assembler_.SetRealizedAddress(cchunk->address);
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AssemblyCodeChunk *result = NULL;
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result = AssemblyCodeBuilder::FinalizeFromTurboAssembler(&turbo_assembler_);
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{ // release
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delete cchunk;
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}
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return result;
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}
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CodeBufferBase *GenerateNearTrampolineBuffer(InterceptRouting *routing, addr_t src, addr_t dst) {
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CodeBufferBase *result = NULL;
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TurboAssembler turbo_assembler_((void *)src);
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#define _ turbo_assembler_.
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// branch to trampoline_target directly
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if (llabs((long long)dst - (long long)src) < ARM64_B_XXX_RANGE) {
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_ b(dst - src);
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} else {
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AssemblyCodeChunk *fast_forward_trampoline = NULL;
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fast_forward_trampoline = GenerateFastForwardTrampoline(src, dst);
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if (!fast_forward_trampoline)
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return NULL;
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// trampoline => fast_forward_trampoline
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addr_t fast_forward_trampoline_addr = fast_forward_trampoline->raw_instruction_start();
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_ b(fast_forward_trampoline_addr - src);
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}
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// free the original trampoline
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result = turbo_assembler_.GetCodeBuffer()->Copy();
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return result;
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}
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#endif
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