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The RISC-V frame pointer convention is different from that of x86 and ARM. FP is the caller's SP, and the saved FP is at FP[-2] instead of FP[0]. Making Dart frames match the convention of C frames allows stack walkers to continue their traversals through transitions between Dart and C (e.g., for stack dumps or profiling). TEST=ci Change-Id: I463348beba70c1a75bfb0d902b3391be524de0fe Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/235960 Reviewed-by: Daco Harkes <dacoharkes@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>
75 lines
2.9 KiB
C++
75 lines
2.9 KiB
C++
// Copyright (c) 2021, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef RUNTIME_VM_STACK_FRAME_RISCV_H_
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#define RUNTIME_VM_STACK_FRAME_RISCV_H_
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#if !defined(RUNTIME_VM_STACK_FRAME_H_)
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#error Do not include stack_frame_riscv.h directly; use stack_frame.h instead.
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#endif
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namespace dart {
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/* RISC-V Dart Frame Layout
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| | <- TOS
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Callee frame | ... |
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| saved PP |
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| code object |
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| saved FP | (FP of current frame)
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| saved PC | (PC of current frame)
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+--------------------+
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Current frame | ... T| <- SP of current frame
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| first local T|
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| caller's PP T|
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| code object T| (current frame's code object)
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| caller's FP |
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| caller's RA | (PC of caller frame)
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+--------------------+
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Caller frame | last parameter | <- SP of caller frame, FP of current frame
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| ... |
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T against a slot indicates it needs to be traversed during GC.
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*/
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static const int kDartFrameFixedSize = 4; // PP, FP, RA, PC marker.
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static const int kSavedPcSlotFromSp = -1;
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static const int kFirstObjectSlotFromFp = -3; // Used by GC to traverse stack.
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static const int kLastFixedObjectSlotFromFp = -4;
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static const int kFirstLocalSlotFromFp = -5;
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static const int kSavedCallerPpSlotFromFp = -4;
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static const int kPcMarkerSlotFromFp = -3;
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static const int kSavedCallerFpSlotFromFp = -2;
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static const int kSavedCallerPcSlotFromFp = -1;
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static const int kParamEndSlotFromFp = -1; // One slot past last parameter.
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static const int kCallerSpSlotFromFp = 0;
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static const int kLastParamSlotFromEntrySp = 0;
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// Entry and exit frame layout.
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#if defined(TARGET_ARCH_RISCV64)
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static const int kExitLinkSlotFromEntryFp = -30;
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#elif defined(TARGET_ARCH_RISCV32)
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static const int kExitLinkSlotFromEntryFp = -42;
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#endif
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COMPILE_ASSERT(kAbiPreservedCpuRegCount == 11);
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COMPILE_ASSERT(kAbiPreservedFpuRegCount == 12);
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// For FFI native -> Dart callbacks, this is the number of stack slots between
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// arguments passed on stack and arguments saved in callback prologue.
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//
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// 2 = return adddress (1) + saved frame pointer (1).
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//
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// If NativeCallbackTrampolines::Enabled(), then
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// kNativeCallbackTrampolineStackDelta must be added as well.
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constexpr intptr_t kCallbackSlotsBeforeSavedArguments = 2;
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// For FFI calls passing in TypedData, we save it on the stack before entering
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// a Dart frame. This denotes how to get to the backed up typed data.
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static const int kFfiCallerTypedDataSlotFromFp = kCallerSpSlotFromFp;
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} // namespace dart
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#endif // RUNTIME_VM_STACK_FRAME_RISCV_H_
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