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[Qemu-devel] [PATCH] disas/libvixl: Update to upstream VIXL 1.5
|
From: |
Peter Maydell |
|
Subject: |
[Qemu-devel] [PATCH] disas/libvixl: Update to upstream VIXL 1.5 |
|
Date: |
Mon, 4 Aug 2014 15:36:27 +0100 |
Update our copy of libvixl to upstream's 1.5 release.
This includes the upstream versions of the fixes we
were carrying locally (commit ffebe899).
Signed-off-by: Peter Maydell <address@hidden>
---
Another VIXL update. RTH will be pleased to know that this
includes support for ADRP...
disas/libvixl/README | 2 +-
disas/libvixl/a64/assembler-a64.h | 363 ++++++++++++++++++++++++++++++----
disas/libvixl/a64/constants-a64.h | 68 ++++++-
disas/libvixl/a64/cpu-a64.h | 27 +++
disas/libvixl/a64/decoder-a64.cc | 15 +-
disas/libvixl/a64/decoder-a64.h | 1 +
disas/libvixl/a64/disasm-a64.cc | 88 +++++++--
disas/libvixl/a64/disasm-a64.h | 2 +-
disas/libvixl/a64/instructions-a64.cc | 25 ++-
disas/libvixl/a64/instructions-a64.h | 10 +
disas/libvixl/platform.h | 8 +-
disas/libvixl/utils.cc | 10 +
disas/libvixl/utils.h | 32 ++-
13 files changed, 558 insertions(+), 93 deletions(-)
diff --git a/disas/libvixl/README b/disas/libvixl/README
index a0ecac3..8301996 100644
--- a/disas/libvixl/README
+++ b/disas/libvixl/README
@@ -2,7 +2,7 @@
The code in this directory is a subset of libvixl:
https://github.com/armvixl/vixl
(specifically, it is the set of files needed for disassembly only,
-taken from libvixl 1.4).
+taken from libvixl 1.5).
Bugfixes should preferably be sent upstream initially.
The disassembler does not currently support the entire A64 instruction
diff --git a/disas/libvixl/a64/assembler-a64.h
b/disas/libvixl/a64/assembler-a64.h
index 1e2947b..cc0b758 100644
--- a/disas/libvixl/a64/assembler-a64.h
+++ b/disas/libvixl/a64/assembler-a64.h
@@ -28,6 +28,7 @@
#define VIXL_A64_ASSEMBLER_A64_H_
#include <list>
+#include <stack>
#include "globals.h"
#include "utils.h"
@@ -574,34 +575,107 @@ class MemOperand {
class Label {
public:
- Label() : is_bound_(false), link_(NULL), target_(NULL) {}
+ Label() : location_(kLocationUnbound) {}
~Label() {
// If the label has been linked to, it needs to be bound to a target.
VIXL_ASSERT(!IsLinked() || IsBound());
}
- inline Instruction* link() const { return link_; }
- inline Instruction* target() const { return target_; }
+ inline bool IsBound() const { return location_ >= 0; }
+ inline bool IsLinked() const { return !links_.empty(); }
- inline bool IsBound() const { return is_bound_; }
- inline bool IsLinked() const { return link_ != NULL; }
+ private:
+ // The list of linked instructions is stored in a stack-like structure. We
+ // don't use std::stack directly because it's slow for the common case where
+ // only one or two instructions refer to a label, and labels themselves are
+ // short-lived. This class behaves like std::stack, but the first few links
+ // are preallocated (configured by kPreallocatedLinks).
+ //
+ // If more than N links are required, this falls back to std::stack.
+ class LinksStack {
+ public:
+ LinksStack() : size_(0), links_extended_(NULL) {}
+ ~LinksStack() {
+ delete links_extended_;
+ }
- inline void set_link(Instruction* new_link) { link_ = new_link; }
+ size_t size() const {
+ return size_;
+ }
- static const int kEndOfChain = 0;
+ bool empty() const {
+ return size_ == 0;
+ }
- private:
- // Indicates if the label has been bound, ie its location is fixed.
- bool is_bound_;
- // Branches instructions branching to this label form a chained list, with
- // their offset indicating where the next instruction is located.
- // link_ points to the latest branch instruction generated branching to this
- // branch.
- // If link_ is not NULL, the label has been linked to.
- Instruction* link_;
+ void push(ptrdiff_t value) {
+ if (size_ < kPreallocatedLinks) {
+ links_[size_] = value;
+ } else {
+ if (links_extended_ == NULL) {
+ links_extended_ = new std::stack<ptrdiff_t>();
+ }
+ VIXL_ASSERT(size_ == (links_extended_->size() + kPreallocatedLinks));
+ links_extended_->push(value);
+ }
+ size_++;
+ }
+
+ ptrdiff_t top() const {
+ return (size_ <= kPreallocatedLinks) ? links_[size_ - 1]
+ : links_extended_->top();
+ }
+
+ void pop() {
+ size_--;
+ if (size_ >= kPreallocatedLinks) {
+ links_extended_->pop();
+ VIXL_ASSERT(size_ == (links_extended_->size() + kPreallocatedLinks));
+ }
+ }
+
+ private:
+ static const size_t kPreallocatedLinks = 4;
+
+ size_t size_;
+ ptrdiff_t links_[kPreallocatedLinks];
+ std::stack<ptrdiff_t> * links_extended_;
+ };
+
+ inline ptrdiff_t location() const { return location_; }
+
+ inline void Bind(ptrdiff_t location) {
+ // Labels can only be bound once.
+ VIXL_ASSERT(!IsBound());
+ location_ = location;
+ }
+
+ inline void AddLink(ptrdiff_t instruction) {
+ // If a label is bound, the assembler already has the information it needs
+ // to write the instruction, so there is no need to add it to links_.
+ VIXL_ASSERT(!IsBound());
+ links_.push(instruction);
+ }
+
+ inline ptrdiff_t GetAndRemoveNextLink() {
+ VIXL_ASSERT(IsLinked());
+ ptrdiff_t link = links_.top();
+ links_.pop();
+ return link;
+ }
+
+ // The offsets of the instructions that have linked to this label.
+ LinksStack links_;
// The label location.
- Instruction* target_;
+ ptrdiff_t location_;
+ static const ptrdiff_t kLocationUnbound = -1;
+
+ // It is not safe to copy labels, so disable the copy constructor by
declaring
+ // it private (without an implementation).
+ Label(const Label&);
+
+ // The Assembler class is responsible for binding and linking labels, since
+ // the stored offsets need to be consistent with the Assembler's buffer.
friend class Assembler;
};
@@ -635,10 +709,49 @@ class Literal {
};
+// Control whether or not position-independent code should be emitted.
+enum PositionIndependentCodeOption {
+ // All code generated will be position-independent; all branches and
+ // references to labels generated with the Label class will use PC-relative
+ // addressing.
+ PositionIndependentCode,
+
+ // Allow VIXL to generate code that refers to absolute addresses. With this
+ // option, it will not be possible to copy the code buffer and run it from a
+ // different address; code must be generated in its final location.
+ PositionDependentCode,
+
+ // Allow VIXL to assume that the bottom 12 bits of the address will be
+ // constant, but that the top 48 bits may change. This allows `adrp` to
+ // function in systems which copy code between pages, but otherwise maintain
+ // 4KB page alignment.
+ PageOffsetDependentCode
+};
+
+
+// Control how scaled- and unscaled-offset loads and stores are generated.
+enum LoadStoreScalingOption {
+ // Prefer scaled-immediate-offset instructions, but emit unscaled-offset,
+ // register-offset, pre-index or post-index instructions if necessary.
+ PreferScaledOffset,
+
+ // Prefer unscaled-immediate-offset instructions, but emit scaled-offset,
+ // register-offset, pre-index or post-index instructions if necessary.
+ PreferUnscaledOffset,
+
+ // Require scaled-immediate-offset instructions.
+ RequireScaledOffset,
+
+ // Require unscaled-immediate-offset instructions.
+ RequireUnscaledOffset
+};
+
+
// Assembler.
class Assembler {
public:
- Assembler(byte* buffer, unsigned buffer_size);
+ Assembler(byte* buffer, unsigned buffer_size,
+ PositionIndependentCodeOption pic = PositionIndependentCode);
// The destructor asserts that one of the following is true:
// * The Assembler object has not been used.
@@ -662,12 +775,15 @@ class Assembler {
// Label.
// Bind a label to the current PC.
void bind(Label* label);
- int UpdateAndGetByteOffsetTo(Label* label);
- inline int UpdateAndGetInstructionOffsetTo(Label* label) {
- VIXL_ASSERT(Label::kEndOfChain == 0);
- return UpdateAndGetByteOffsetTo(label) >> kInstructionSizeLog2;
- }
+ // Return the address of a bound label.
+ template <typename T>
+ inline T GetLabelAddress(const Label * label) {
+ VIXL_ASSERT(label->IsBound());
+ VIXL_STATIC_ASSERT(sizeof(T) >= sizeof(uintptr_t));
+ VIXL_STATIC_ASSERT(sizeof(*buffer_) == 1);
+ return reinterpret_cast<T>(buffer_ + label->location());
+ }
// Instruction set functions.
@@ -733,6 +849,12 @@ class Assembler {
// Calculate the address of a PC offset.
void adr(const Register& rd, int imm21);
+ // Calculate the page address of a label.
+ void adrp(const Register& rd, Label* label);
+
+ // Calculate the page address of a PC offset.
+ void adrp(const Register& rd, int imm21);
+
// Data Processing instructions.
// Add.
void add(const Register& rd,
@@ -1112,31 +1234,76 @@ class Assembler {
// Memory instructions.
// Load integer or FP register.
- void ldr(const CPURegister& rt, const MemOperand& src);
+ void ldr(const CPURegister& rt, const MemOperand& src,
+ LoadStoreScalingOption option = PreferScaledOffset);
// Store integer or FP register.
- void str(const CPURegister& rt, const MemOperand& dst);
+ void str(const CPURegister& rt, const MemOperand& dst,
+ LoadStoreScalingOption option = PreferScaledOffset);
// Load word with sign extension.
- void ldrsw(const Register& rt, const MemOperand& src);
+ void ldrsw(const Register& rt, const MemOperand& src,
+ LoadStoreScalingOption option = PreferScaledOffset);
// Load byte.
- void ldrb(const Register& rt, const MemOperand& src);
+ void ldrb(const Register& rt, const MemOperand& src,
+ LoadStoreScalingOption option = PreferScaledOffset);
// Store byte.
- void strb(const Register& rt, const MemOperand& dst);
+ void strb(const Register& rt, const MemOperand& dst,
+ LoadStoreScalingOption option = PreferScaledOffset);
// Load byte with sign extension.
- void ldrsb(const Register& rt, const MemOperand& src);
+ void ldrsb(const Register& rt, const MemOperand& src,
+ LoadStoreScalingOption option = PreferScaledOffset);
// Load half-word.
- void ldrh(const Register& rt, const MemOperand& src);
+ void ldrh(const Register& rt, const MemOperand& src,
+ LoadStoreScalingOption option = PreferScaledOffset);
// Store half-word.
- void strh(const Register& rt, const MemOperand& dst);
+ void strh(const Register& rt, const MemOperand& dst,
+ LoadStoreScalingOption option = PreferScaledOffset);
// Load half-word with sign extension.
- void ldrsh(const Register& rt, const MemOperand& src);
+ void ldrsh(const Register& rt, const MemOperand& src,
+ LoadStoreScalingOption option = PreferScaledOffset);
+
+ // Load integer or FP register (with unscaled offset).
+ void ldur(const CPURegister& rt, const MemOperand& src,
+ LoadStoreScalingOption option = PreferUnscaledOffset);
+
+ // Store integer or FP register (with unscaled offset).
+ void stur(const CPURegister& rt, const MemOperand& src,
+ LoadStoreScalingOption option = PreferUnscaledOffset);
+
+ // Load word with sign extension.
+ void ldursw(const Register& rt, const MemOperand& src,
+ LoadStoreScalingOption option = PreferUnscaledOffset);
+
+ // Load byte (with unscaled offset).
+ void ldurb(const Register& rt, const MemOperand& src,
+ LoadStoreScalingOption option = PreferUnscaledOffset);
+
+ // Store byte (with unscaled offset).
+ void sturb(const Register& rt, const MemOperand& dst,
+ LoadStoreScalingOption option = PreferUnscaledOffset);
+
+ // Load byte with sign extension (and unscaled offset).
+ void ldursb(const Register& rt, const MemOperand& src,
+ LoadStoreScalingOption option = PreferUnscaledOffset);
+
+ // Load half-word (with unscaled offset).
+ void ldurh(const Register& rt, const MemOperand& src,
+ LoadStoreScalingOption option = PreferUnscaledOffset);
+
+ // Store half-word (with unscaled offset).
+ void sturh(const Register& rt, const MemOperand& dst,
+ LoadStoreScalingOption option = PreferUnscaledOffset);
+
+ // Load half-word with sign extension (and unscaled offset).
+ void ldursh(const Register& rt, const MemOperand& src,
+ LoadStoreScalingOption option = PreferUnscaledOffset);
// Load integer or FP register pair.
void ldp(const CPURegister& rt, const CPURegister& rt2,
@@ -1166,6 +1333,79 @@ class Assembler {
// Load single precision floating point literal to FP register.
void ldr(const FPRegister& ft, float imm);
+ // Store exclusive byte.
+ void stxrb(const Register& rs, const Register& rt, const MemOperand& dst);
+
+ // Store exclusive half-word.
+ void stxrh(const Register& rs, const Register& rt, const MemOperand& dst);
+
+ // Store exclusive register.
+ void stxr(const Register& rs, const Register& rt, const MemOperand& dst);
+
+ // Load exclusive byte.
+ void ldxrb(const Register& rt, const MemOperand& src);
+
+ // Load exclusive half-word.
+ void ldxrh(const Register& rt, const MemOperand& src);
+
+ // Load exclusive register.
+ void ldxr(const Register& rt, const MemOperand& src);
+
+ // Store exclusive register pair.
+ void stxp(const Register& rs,
+ const Register& rt,
+ const Register& rt2,
+ const MemOperand& dst);
+
+ // Load exclusive register pair.
+ void ldxp(const Register& rt, const Register& rt2, const MemOperand& src);
+
+ // Store-release exclusive byte.
+ void stlxrb(const Register& rs, const Register& rt, const MemOperand& dst);
+
+ // Store-release exclusive half-word.
+ void stlxrh(const Register& rs, const Register& rt, const MemOperand& dst);
+
+ // Store-release exclusive register.
+ void stlxr(const Register& rs, const Register& rt, const MemOperand& dst);
+
+ // Load-acquire exclusive byte.
+ void ldaxrb(const Register& rt, const MemOperand& src);
+
+ // Load-acquire exclusive half-word.
+ void ldaxrh(const Register& rt, const MemOperand& src);
+
+ // Load-acquire exclusive register.
+ void ldaxr(const Register& rt, const MemOperand& src);
+
+ // Store-release exclusive register pair.
+ void stlxp(const Register& rs,
+ const Register& rt,
+ const Register& rt2,
+ const MemOperand& dst);
+
+ // Load-acquire exclusive register pair.
+ void ldaxp(const Register& rt, const Register& rt2, const MemOperand& src);
+
+ // Store-release byte.
+ void stlrb(const Register& rt, const MemOperand& dst);
+
+ // Store-release half-word.
+ void stlrh(const Register& rt, const MemOperand& dst);
+
+ // Store-release register.
+ void stlr(const Register& rt, const MemOperand& dst);
+
+ // Load-acquire byte.
+ void ldarb(const Register& rt, const MemOperand& src);
+
+ // Load-acquire half-word.
+ void ldarh(const Register& rt, const MemOperand& src);
+
+ // Load-acquire register.
+ void ldar(const Register& rt, const MemOperand& src);
+
+
// Move instructions. The default shift of -1 indicates that the move
// instruction will calculate an appropriate 16-bit immediate and left shift
// that is equal to the 64-bit immediate argument. If an explicit left shift
@@ -1214,6 +1454,9 @@ class Assembler {
// System hint.
void hint(SystemHint code);
+ // Clear exclusive monitor.
+ void clrex(int imm4 = 0xf);
+
// Data memory barrier.
void dmb(BarrierDomain domain, BarrierType type);
@@ -1429,6 +1672,11 @@ class Assembler {
return rt2.code() << Rt2_offset;
}
+ static Instr Rs(CPURegister rs) {
+ VIXL_ASSERT(rs.code() != kSPRegInternalCode);
+ return rs.code() << Rs_offset;
+ }
+
// These encoding functions allow the stack pointer to be encoded, and
// disallow the zero register.
static Instr RdSP(Register rd) {
@@ -1619,6 +1867,11 @@ class Assembler {
return imm7 << ImmHint_offset;
}
+ static Instr CRm(int imm4) {
+ VIXL_ASSERT(is_uint4(imm4));
+ return imm4 << CRm_offset;
+ }
+
static Instr ImmBarrierDomain(int imm2) {
VIXL_ASSERT(is_uint2(imm2));
return imm2 << ImmBarrierDomain_offset;
@@ -1660,16 +1913,20 @@ class Assembler {
}
// Size of the code generated in bytes
- uint64_t SizeOfCodeGenerated() const {
+ size_t SizeOfCodeGenerated() const {
VIXL_ASSERT((pc_ >= buffer_) && (pc_ < (buffer_ + buffer_size_)));
return pc_ - buffer_;
}
// Size of the code generated since label to the current position.
- uint64_t SizeOfCodeGeneratedSince(Label* label) const {
+ size_t SizeOfCodeGeneratedSince(Label* label) const {
+ size_t pc_offset = SizeOfCodeGenerated();
+
VIXL_ASSERT(label->IsBound());
- VIXL_ASSERT((pc_ >= label->target()) && (pc_ < (buffer_ + buffer_size_)));
- return pc_ - label->target();
+ VIXL_ASSERT(pc_offset >= static_cast<size_t>(label->location()));
+ VIXL_ASSERT(pc_offset < buffer_size_);
+
+ return pc_offset - label->location();
}
@@ -1693,6 +1950,15 @@ class Assembler {
void EmitLiteralPool(LiteralPoolEmitOption option = NoJumpRequired);
size_t LiteralPoolSize();
+ inline PositionIndependentCodeOption pic() {
+ return pic_;
+ }
+
+ inline bool AllowPageOffsetDependentCode() {
+ return (pic() == PageOffsetDependentCode) ||
+ (pic() == PositionDependentCode);
+ }
+
protected:
inline const Register& AppropriateZeroRegFor(const CPURegister& reg) const {
return reg.Is64Bits() ? xzr : wzr;
@@ -1701,7 +1967,8 @@ class Assembler {
void LoadStore(const CPURegister& rt,
const MemOperand& addr,
- LoadStoreOp op);
+ LoadStoreOp op,
+ LoadStoreScalingOption option = PreferScaledOffset);
static bool IsImmLSUnscaled(ptrdiff_t offset);
static bool IsImmLSScaled(ptrdiff_t offset, LSDataSize size);
@@ -1717,9 +1984,9 @@ class Assembler {
LogicalOp op);
static bool IsImmLogical(uint64_t value,
unsigned width,
- unsigned* n,
- unsigned* imm_s,
- unsigned* imm_r);
+ unsigned* n = NULL,
+ unsigned* imm_s = NULL,
+ unsigned* imm_r = NULL);
void ConditionalCompare(const Register& rn,
const Operand& operand,
@@ -1823,6 +2090,17 @@ class Assembler {
void RecordLiteral(int64_t imm, unsigned size);
+ // Link the current (not-yet-emitted) instruction to the specified label,
then
+ // return an offset to be encoded in the instruction. If the label is not yet
+ // bound, an offset of 0 is returned.
+ ptrdiff_t LinkAndGetByteOffsetTo(Label * label);
+ ptrdiff_t LinkAndGetInstructionOffsetTo(Label * label);
+ ptrdiff_t LinkAndGetPageOffsetTo(Label * label);
+
+ // A common implementation for the LinkAndGet<Type>OffsetTo helpers.
+ template <int element_size>
+ ptrdiff_t LinkAndGetOffsetTo(Label* label);
+
// Emit the instruction at pc_.
void Emit(Instr instruction) {
VIXL_STATIC_ASSERT(sizeof(*pc_) == 1);
@@ -1864,12 +2142,15 @@ class Assembler {
// The buffer into which code and relocation info are generated.
Instruction* buffer_;
// Buffer size, in bytes.
- unsigned buffer_size_;
+ size_t buffer_size_;
Instruction* pc_;
std::list<Literal*> literals_;
Instruction* next_literal_pool_check_;
unsigned literal_pool_monitor_;
+ PositionIndependentCodeOption pic_;
+
+ friend class Label;
friend class BlockLiteralPoolScope;
#ifdef DEBUG
diff --git a/disas/libvixl/a64/constants-a64.h
b/disas/libvixl/a64/constants-a64.h
index 99677c1..7a14f85 100644
--- a/disas/libvixl/a64/constants-a64.h
+++ b/disas/libvixl/a64/constants-a64.h
@@ -46,13 +46,13 @@ R(24) R(25) R(26) R(27) R(28) R(29) R(30) R(31)
#define INSTRUCTION_FIELDS_LIST(V_)
\
/* Register fields */
\
-V_(Rd, 4, 0, Bits) /* Destination register. */
\
-V_(Rn, 9, 5, Bits) /* First source register. */
\
-V_(Rm, 20, 16, Bits) /* Second source register. */
\
-V_(Ra, 14, 10, Bits) /* Third source register. */
\
-V_(Rt, 4, 0, Bits) /* Load dest / store source. */
\
-V_(Rt2, 14, 10, Bits) /* Load second dest / */
\
- /* store second source. */
\
+V_(Rd, 4, 0, Bits) /* Destination register. */
\
+V_(Rn, 9, 5, Bits) /* First source register. */
\
+V_(Rm, 20, 16, Bits) /* Second source register. */
\
+V_(Ra, 14, 10, Bits) /* Third source register. */
\
+V_(Rt, 4, 0, Bits) /* Load/store register. */
\
+V_(Rt2, 14, 10, Bits) /* Load/store second register. */
\
+V_(Rs, 20, 16, Bits) /* Exclusive access status. */
\
V_(PrefetchMode, 4, 0, Bits)
\
\
/* Common bits */
\
@@ -126,6 +126,13 @@ V_(SysOp1, 18, 16, Bits)
\
V_(SysOp2, 7, 5, Bits)
\
V_(CRn, 15, 12, Bits)
\
V_(CRm, 11, 8, Bits)
\
+
\
+/* Load-/store-exclusive */
\
+V_(LdStXLoad, 22, 22, Bits)
\
+V_(LdStXNotExclusive, 23, 23, Bits)
\
+V_(LdStXAcquireRelease, 15, 15, Bits)
\
+V_(LdStXSizeLog2, 31, 30, Bits)
\
+V_(LdStXPair, 21, 21, Bits)
\
#define SYSTEM_REGISTER_FIELDS_LIST(V_, M_)
\
@@ -585,6 +592,13 @@ enum MemBarrierOp {
ISB = MemBarrierFixed | 0x00000040
};
+enum SystemExclusiveMonitorOp {
+ SystemExclusiveMonitorFixed = 0xD503305F,
+ SystemExclusiveMonitorFMask = 0xFFFFF0FF,
+ SystemExclusiveMonitorMask = 0xFFFFF0FF,
+ CLREX = SystemExclusiveMonitorFixed
+};
+
// Any load or store.
enum LoadStoreAnyOp {
LoadStoreAnyFMask = 0x0a000000,
@@ -702,7 +716,7 @@ enum LoadStoreUnscaledOffsetOp {
// Load/store (post, pre, offset and unsigned.)
enum LoadStoreOp {
- LoadStoreOpMask = 0xC4C00000,
+ LoadStoreOpMask = 0xC4C00000,
#define LOAD_STORE(A, B, C, D) \
A##B##_##C = D
LOAD_STORE_OP_LIST(LOAD_STORE),
@@ -756,6 +770,44 @@ enum LoadStoreRegisterOffset {
#undef LOAD_STORE_REGISTER_OFFSET
};
+enum LoadStoreExclusive {
+ LoadStoreExclusiveFixed = 0x08000000,
+ LoadStoreExclusiveFMask = 0x3F000000,
+ LoadStoreExclusiveMask = 0xFFE08000,
+ STXRB_w = LoadStoreExclusiveFixed | 0x00000000,
+ STXRH_w = LoadStoreExclusiveFixed | 0x40000000,
+ STXR_w = LoadStoreExclusiveFixed | 0x80000000,
+ STXR_x = LoadStoreExclusiveFixed | 0xC0000000,
+ LDXRB_w = LoadStoreExclusiveFixed | 0x00400000,
+ LDXRH_w = LoadStoreExclusiveFixed | 0x40400000,
+ LDXR_w = LoadStoreExclusiveFixed | 0x80400000,
+ LDXR_x = LoadStoreExclusiveFixed | 0xC0400000,
+ STXP_w = LoadStoreExclusiveFixed | 0x80200000,
+ STXP_x = LoadStoreExclusiveFixed | 0xC0200000,
+ LDXP_w = LoadStoreExclusiveFixed | 0x80600000,
+ LDXP_x = LoadStoreExclusiveFixed | 0xC0600000,
+ STLXRB_w = LoadStoreExclusiveFixed | 0x00008000,
+ STLXRH_w = LoadStoreExclusiveFixed | 0x40008000,
+ STLXR_w = LoadStoreExclusiveFixed | 0x80008000,
+ STLXR_x = LoadStoreExclusiveFixed | 0xC0008000,
+ LDAXRB_w = LoadStoreExclusiveFixed | 0x00408000,
+ LDAXRH_w = LoadStoreExclusiveFixed | 0x40408000,
+ LDAXR_w = LoadStoreExclusiveFixed | 0x80408000,
+ LDAXR_x = LoadStoreExclusiveFixed | 0xC0408000,
+ STLXP_w = LoadStoreExclusiveFixed | 0x80208000,
+ STLXP_x = LoadStoreExclusiveFixed | 0xC0208000,
+ LDAXP_w = LoadStoreExclusiveFixed | 0x80608000,
+ LDAXP_x = LoadStoreExclusiveFixed | 0xC0608000,
+ STLRB_w = LoadStoreExclusiveFixed | 0x00808000,
+ STLRH_w = LoadStoreExclusiveFixed | 0x40808000,
+ STLR_w = LoadStoreExclusiveFixed | 0x80808000,
+ STLR_x = LoadStoreExclusiveFixed | 0xC0808000,
+ LDARB_w = LoadStoreExclusiveFixed | 0x00C08000,
+ LDARH_w = LoadStoreExclusiveFixed | 0x40C08000,
+ LDAR_w = LoadStoreExclusiveFixed | 0x80C08000,
+ LDAR_x = LoadStoreExclusiveFixed | 0xC0C08000
+};
+
// Conditional compare.
enum ConditionalCompareOp {
ConditionalCompareMask = 0x60000000,
diff --git a/disas/libvixl/a64/cpu-a64.h b/disas/libvixl/a64/cpu-a64.h
index dfd8f01..59b7974 100644
--- a/disas/libvixl/a64/cpu-a64.h
+++ b/disas/libvixl/a64/cpu-a64.h
@@ -28,6 +28,7 @@
#define VIXL_CPU_A64_H
#include "globals.h"
+#include "instructions-a64.h"
namespace vixl {
@@ -42,6 +43,32 @@ class CPU {
// safely run.
static void EnsureIAndDCacheCoherency(void *address, size_t length);
+ // Handle tagged pointers.
+ template <typename T>
+ static T SetPointerTag(T pointer, uint64_t tag) {
+ VIXL_ASSERT(is_uintn(kAddressTagWidth, tag));
+
+ // Use C-style casts to get static_cast behaviour for integral types (T),
+ // and reinterpret_cast behaviour for other types.
+
+ uint64_t raw = (uint64_t)pointer;
+ VIXL_STATIC_ASSERT(sizeof(pointer) == sizeof(raw));
+
+ raw = (raw & ~kAddressTagMask) | (tag << kAddressTagOffset);
+ return (T)raw;
+ }
+
+ template <typename T>
+ static uint64_t GetPointerTag(T pointer) {
+ // Use C-style casts to get static_cast behaviour for integral types (T),
+ // and reinterpret_cast behaviour for other types.
+
+ uint64_t raw = (uint64_t)pointer;
+ VIXL_STATIC_ASSERT(sizeof(pointer) == sizeof(raw));
+
+ return (raw & kAddressTagMask) >> kAddressTagOffset;
+ }
+
private:
// Return the content of the cache type register.
static uint32_t GetCacheType();
diff --git a/disas/libvixl/a64/decoder-a64.cc b/disas/libvixl/a64/decoder-a64.cc
index 8450eb3..5831b73 100644
--- a/disas/libvixl/a64/decoder-a64.cc
+++ b/disas/libvixl/a64/decoder-a64.cc
@@ -171,9 +171,9 @@ void Decoder::DecodePCRelAddressing(Instruction* instr) {
void Decoder::DecodeBranchSystemException(Instruction* instr) {
VIXL_ASSERT((instr->Bits(27, 24) == 0x4) ||
- (instr->Bits(27, 24) == 0x5) ||
- (instr->Bits(27, 24) == 0x6) ||
- (instr->Bits(27, 24) == 0x7) );
+ (instr->Bits(27, 24) == 0x5) ||
+ (instr->Bits(27, 24) == 0x6) ||
+ (instr->Bits(27, 24) == 0x7) );
switch (instr->Bits(31, 29)) {
case 0:
@@ -272,16 +272,15 @@ void Decoder::DecodeBranchSystemException(Instruction*
instr) {
void Decoder::DecodeLoadStore(Instruction* instr) {
VIXL_ASSERT((instr->Bits(27, 24) == 0x8) ||
- (instr->Bits(27, 24) == 0x9) ||
- (instr->Bits(27, 24) == 0xC) ||
- (instr->Bits(27, 24) == 0xD) );
+ (instr->Bits(27, 24) == 0x9) ||
+ (instr->Bits(27, 24) == 0xC) ||
+ (instr->Bits(27, 24) == 0xD) );
if (instr->Bit(24) == 0) {
if (instr->Bit(28) == 0) {
if (instr->Bit(29) == 0) {
if (instr->Bit(26) == 0) {
- // TODO: VisitLoadStoreExclusive.
- VisitUnimplemented(instr);
+ VisitLoadStoreExclusive(instr);
} else {
DecodeAdvSIMDLoadStore(instr);
}
diff --git a/disas/libvixl/a64/decoder-a64.h b/disas/libvixl/a64/decoder-a64.h
index bbbbd81..72c1519 100644
--- a/disas/libvixl/a64/decoder-a64.h
+++ b/disas/libvixl/a64/decoder-a64.h
@@ -59,6 +59,7 @@
V(LoadStorePreIndex) \
V(LoadStoreRegisterOffset) \
V(LoadStoreUnsignedOffset) \
+ V(LoadStoreExclusive) \
V(LogicalShifted) \
V(AddSubShifted) \
V(AddSubExtended) \
diff --git a/disas/libvixl/a64/disasm-a64.cc b/disas/libvixl/a64/disasm-a64.cc
index f81ce4b..248ebfd 100644
--- a/disas/libvixl/a64/disasm-a64.cc
+++ b/disas/libvixl/a64/disasm-a64.cc
@@ -24,6 +24,7 @@
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#include <cstdlib>
#include "a64/disasm-a64.h"
namespace vixl {
@@ -529,7 +530,7 @@ void Disassembler::VisitExtract(Instruction* instr) {
void Disassembler::VisitPCRelAddressing(Instruction* instr) {
switch (instr->Mask(PCRelAddressingMask)) {
case ADR: Format(instr, "adr", "'Xd, 'AddrPCRelByte"); break;
- // ADRP is not implemented.
+ case ADRP: Format(instr, "adrp", "'Xd, 'AddrPCRelPage"); break;
default: Format(instr, "unimplemented", "(PCRelAddressing)");
}
}
@@ -943,6 +944,49 @@ void
Disassembler::VisitLoadStorePairNonTemporal(Instruction* instr) {
}
+void Disassembler::VisitLoadStoreExclusive(Instruction* instr) {
+ const char *mnemonic = "unimplemented";
+ const char *form;
+
+ switch (instr->Mask(LoadStoreExclusiveMask)) {
+ case STXRB_w: mnemonic = "stxrb"; form = "'Ws, 'Wt, ['Xns]"; break;
+ case STXRH_w: mnemonic = "stxrh"; form = "'Ws, 'Wt, ['Xns]"; break;
+ case STXR_w: mnemonic = "stxr"; form = "'Ws, 'Wt, ['Xns]"; break;
+ case STXR_x: mnemonic = "stxr"; form = "'Ws, 'Xt, ['Xns]"; break;
+ case LDXRB_w: mnemonic = "ldxrb"; form = "'Wt, ['Xns]"; break;
+ case LDXRH_w: mnemonic = "ldxrh"; form = "'Wt, ['Xns]"; break;
+ case LDXR_w: mnemonic = "ldxr"; form = "'Wt, ['Xns]"; break;
+ case LDXR_x: mnemonic = "ldxr"; form = "'Xt, ['Xns]"; break;
+ case STXP_w: mnemonic = "stxp"; form = "'Ws, 'Wt, 'Wt2, ['Xns]"; break;
+ case STXP_x: mnemonic = "stxp"; form = "'Ws, 'Xt, 'Xt2, ['Xns]"; break;
+ case LDXP_w: mnemonic = "ldxp"; form = "'Wt, 'Wt2, ['Xns]"; break;
+ case LDXP_x: mnemonic = "ldxp"; form = "'Xt, 'Xt2, ['Xns]"; break;
+ case STLXRB_w: mnemonic = "stlxrb"; form = "'Ws, 'Wt, ['Xns]"; break;
+ case STLXRH_w: mnemonic = "stlxrh"; form = "'Ws, 'Wt, ['Xns]"; break;
+ case STLXR_w: mnemonic = "stlxr"; form = "'Ws, 'Wt, ['Xns]"; break;
+ case STLXR_x: mnemonic = "stlxr"; form = "'Ws, 'Xt, ['Xns]"; break;
+ case LDAXRB_w: mnemonic = "ldaxrb"; form = "'Wt, ['Xns]"; break;
+ case LDAXRH_w: mnemonic = "ldaxrh"; form = "'Wt, ['Xns]"; break;
+ case LDAXR_w: mnemonic = "ldaxr"; form = "'Wt, ['Xns]"; break;
+ case LDAXR_x: mnemonic = "ldaxr"; form = "'Xt, ['Xns]"; break;
+ case STLXP_w: mnemonic = "stlxp"; form = "'Ws, 'Wt, 'Wt2, ['Xns]"; break;
+ case STLXP_x: mnemonic = "stlxp"; form = "'Ws, 'Xt, 'Xt2, ['Xns]"; break;
+ case LDAXP_w: mnemonic = "ldaxp"; form = "'Wt, 'Wt2, ['Xns]"; break;
+ case LDAXP_x: mnemonic = "ldaxp"; form = "'Xt, 'Xt2, ['Xns]"; break;
+ case STLRB_w: mnemonic = "stlrb"; form = "'Wt, ['Xns]"; break;
+ case STLRH_w: mnemonic = "stlrh"; form = "'Wt, ['Xns]"; break;
+ case STLR_w: mnemonic = "stlr"; form = "'Wt, ['Xns]"; break;
+ case STLR_x: mnemonic = "stlr"; form = "'Xt, ['Xns]"; break;
+ case LDARB_w: mnemonic = "ldarb"; form = "'Wt, ['Xns]"; break;
+ case LDARH_w: mnemonic = "ldarh"; form = "'Wt, ['Xns]"; break;
+ case LDAR_w: mnemonic = "ldar"; form = "'Wt, ['Xns]"; break;
+ case LDAR_x: mnemonic = "ldar"; form = "'Xt, ['Xns]"; break;
+ default: form = "(LoadStoreExclusive)";
+ }
+ Format(instr, mnemonic, form);
+}
+
+
void Disassembler::VisitFPCompare(Instruction* instr) {
const char *mnemonic = "unimplemented";
const char *form = "'Fn, 'Fm";
@@ -1162,7 +1206,15 @@ void Disassembler::VisitSystem(Instruction* instr) {
const char *mnemonic = "unimplemented";
const char *form = "(System)";
- if (instr->Mask(SystemSysRegFMask) == SystemSysRegFixed) {
+ if (instr->Mask(SystemExclusiveMonitorFMask) == SystemExclusiveMonitorFixed)
{
+ switch (instr->Mask(SystemExclusiveMonitorMask)) {
+ case CLREX: {
+ mnemonic = "clrex";
+ form = (instr->CRm() == 0xf) ? NULL : "'IX";
+ break;
+ }
+ }
+ } else if (instr->Mask(SystemSysRegFMask) == SystemSysRegFixed) {
switch (instr->Mask(SystemSysRegMask)) {
case MRS: {
mnemonic = "mrs";
@@ -1184,7 +1236,6 @@ void Disassembler::VisitSystem(Instruction* instr) {
}
}
} else if (instr->Mask(SystemHintFMask) == SystemHintFixed) {
- VIXL_ASSERT(instr->Mask(SystemHintMask) == HINT);
switch (instr->ImmHint()) {
case NOP: {
mnemonic = "nop";
@@ -1312,6 +1363,7 @@ int Disassembler::SubstituteRegisterField(Instruction*
instr,
case 'n': reg_num = instr->Rn(); break;
case 'm': reg_num = instr->Rm(); break;
case 'a': reg_num = instr->Ra(); break;
+ case 's': reg_num = instr->Rs(); break;
case 't': {
if (format[2] == '2') {
reg_num = instr->Rt2();
@@ -1458,6 +1510,10 @@ int Disassembler::SubstituteImmediateField(Instruction*
instr,
AppendToOutput("#0x%" PRIx64, instr->ImmException());
return 6;
}
+ case 'X': { // IX - CLREX instruction.
+ AppendToOutput("#0x%" PRIx64, instr->CRm());
+ return 2;
+ }
default: {
VIXL_UNIMPLEMENTED();
return 0;
@@ -1564,21 +1620,20 @@ int Disassembler::SubstituteConditionField(Instruction*
instr,
int Disassembler::SubstitutePCRelAddressField(Instruction* instr,
const char* format) {
- USE(format);
- VIXL_ASSERT(strncmp(format, "AddrPCRel", 9) == 0);
+ VIXL_ASSERT((strcmp(format, "AddrPCRelByte") == 0) || // Used by `adr`.
+ (strcmp(format, "AddrPCRelPage") == 0)); // Used by `adrp`.
- int offset = instr->ImmPCRel();
+ int64_t offset = instr->ImmPCRel();
+ Instruction * base = instr;
- // Only ADR (AddrPCRelByte) is supported.
- VIXL_ASSERT(strcmp(format, "AddrPCRelByte") == 0);
-
- char sign = '+';
- if (offset < 0) {
- offset = -offset;
- sign = '-';
+ if (format[9] == 'P') {
+ offset *= kPageSize;
+ base = AlignDown(base, kPageSize);
}
- VIXL_STATIC_ASSERT(sizeof(*instr) == 1);
- AppendToOutput("#%c0x%x (addr %p)", sign, offset, instr + offset);
+
+ char sign = (offset < 0) ? '-' : '+';
+ void * target = reinterpret_cast<void *>(base + offset);
+ AppendToOutput("#%c0x%" PRIx64 " (addr %p)", sign, std::abs(offset), target);
return 13;
}
@@ -1606,7 +1661,8 @@ int
Disassembler::SubstituteBranchTargetField(Instruction* instr,
sign = '-';
}
VIXL_STATIC_ASSERT(sizeof(*instr) == 1);
- AppendToOutput("#%c0x%" PRIx64 " (addr %p)", sign, offset, instr + offset);
+ void * address = reinterpret_cast<void *>(instr + offset);
+ AppendToOutput("#%c0x%" PRIx64 " (addr %p)", sign, offset, address);
return 8;
}
diff --git a/disas/libvixl/a64/disasm-a64.h b/disas/libvixl/a64/disasm-a64.h
index 3a56e15..06ee43f 100644
--- a/disas/libvixl/a64/disasm-a64.h
+++ b/disas/libvixl/a64/disasm-a64.h
@@ -85,7 +85,7 @@ class Disassembler: public DecoderVisitor {
bool IsMovzMovnImm(unsigned reg_size, uint64_t value);
void ResetOutput();
- void AppendToOutput(const char* string, ...);
+ void AppendToOutput(const char* string, ...) PRINTF_CHECK(2, 3);
char* buffer_;
uint32_t buffer_pos_;
diff --git a/disas/libvixl/a64/instructions-a64.cc
b/disas/libvixl/a64/instructions-a64.cc
index c4eb7c4..e9caceb 100644
--- a/disas/libvixl/a64/instructions-a64.cc
+++ b/disas/libvixl/a64/instructions-a64.cc
@@ -149,17 +149,24 @@ LSDataSize CalcLSPairDataSize(LoadStorePairOp op) {
Instruction* Instruction::ImmPCOffsetTarget() {
+ Instruction * base = this;
ptrdiff_t offset;
if (IsPCRelAddressing()) {
- // PC-relative addressing. Only ADR is supported.
+ // ADR and ADRP.
offset = ImmPCRel();
+ if (Mask(PCRelAddressingMask) == ADRP) {
+ base = AlignDown(base, kPageSize);
+ offset *= kPageSize;
+ } else {
+ VIXL_ASSERT(Mask(PCRelAddressingMask) == ADR);
+ }
} else {
// All PC-relative branches.
VIXL_ASSERT(BranchType() != UnknownBranchType);
// Relative branch offsets are instruction-size-aligned.
offset = ImmBranch() << kInstructionSizeLog2;
}
- return this + offset;
+ return base + offset;
}
@@ -185,10 +192,16 @@ void Instruction::SetImmPCOffsetTarget(Instruction*
target) {
void Instruction::SetPCRelImmTarget(Instruction* target) {
- // ADRP is not supported, so 'this' must point to an ADR instruction.
- VIXL_ASSERT(Mask(PCRelAddressingMask) == ADR);
-
- Instr imm = Assembler::ImmPCRelAddress(target - this);
+ int32_t imm21;
+ if ((Mask(PCRelAddressingMask) == ADR)) {
+ imm21 = target - this;
+ } else {
+ VIXL_ASSERT(Mask(PCRelAddressingMask) == ADRP);
+ uintptr_t this_page = reinterpret_cast<uintptr_t>(this) / kPageSize;
+ uintptr_t target_page = reinterpret_cast<uintptr_t>(target) / kPageSize;
+ imm21 = target_page - this_page;
+ }
+ Instr imm = Assembler::ImmPCRelAddress(imm21);
SetInstructionBits(Mask(~ImmPCRel_mask) | imm);
}
diff --git a/disas/libvixl/a64/instructions-a64.h
b/disas/libvixl/a64/instructions-a64.h
index a4240d7..d5b90c5 100644
--- a/disas/libvixl/a64/instructions-a64.h
+++ b/disas/libvixl/a64/instructions-a64.h
@@ -41,6 +41,10 @@ const unsigned kLiteralEntrySize = 4;
const unsigned kLiteralEntrySizeLog2 = 2;
const unsigned kMaxLoadLiteralRange = 1 * MBytes;
+// This is the nominal page size (as used by the adrp instruction); the actual
+// size of the memory pages allocated by the kernel is likely to differ.
+const unsigned kPageSize = 4 * KBytes;
+
const unsigned kWRegSize = 32;
const unsigned kWRegSizeLog2 = 5;
const unsigned kWRegSizeInBytes = kWRegSize / 8;
@@ -79,6 +83,12 @@ const unsigned kZeroRegCode = 31;
const unsigned kSPRegInternalCode = 63;
const unsigned kRegCodeMask = 0x1f;
+const unsigned kAddressTagOffset = 56;
+const unsigned kAddressTagWidth = 8;
+const uint64_t kAddressTagMask =
+ ((UINT64_C(1) << kAddressTagWidth) - 1) << kAddressTagOffset;
+VIXL_STATIC_ASSERT(kAddressTagMask == UINT64_C(0xff00000000000000));
+
// AArch64 floating-point specifics. These match IEEE-754.
const unsigned kDoubleMantissaBits = 52;
const unsigned kDoubleExponentBits = 11;
diff --git a/disas/libvixl/platform.h b/disas/libvixl/platform.h
index b5c2085..de2b110 100644
--- a/disas/libvixl/platform.h
+++ b/disas/libvixl/platform.h
@@ -28,14 +28,10 @@
#define PLATFORM_H
// Define platform specific functionalities.
+#include <signal.h>
namespace vixl {
-#ifdef USE_SIMULATOR
-// Currently we assume running the simulator implies running on x86 hardware.
-inline void HostBreakpoint() { asm("int3"); }
-#else
-inline void HostBreakpoint() { asm("brk"); }
-#endif
+inline void HostBreakpoint() { raise(SIGINT); }
} // namespace vixl
#endif
diff --git a/disas/libvixl/utils.cc b/disas/libvixl/utils.cc
index c9c05d1..4d4fcbd 100644
--- a/disas/libvixl/utils.cc
+++ b/disas/libvixl/utils.cc
@@ -124,4 +124,14 @@ int CountSetBits(uint64_t value, int width) {
return value;
}
+
+
+uint64_t LowestSetBit(uint64_t value) {
+ return value & -value;
+}
+
+
+bool IsPowerOf2(int64_t value) {
+ return (value != 0) && ((value & (value - 1)) == 0);
+}
} // namespace vixl
diff --git a/disas/libvixl/utils.h b/disas/libvixl/utils.h
index 83c928c..b472f0e 100644
--- a/disas/libvixl/utils.h
+++ b/disas/libvixl/utils.h
@@ -33,6 +33,14 @@
namespace vixl {
+// Macros for compile-time format checking.
+#if defined(__GNUC__)
+#define PRINTF_CHECK(format_index, varargs_index) \
+ __attribute__((format(printf, format_index, varargs_index)))
+#else
+#define PRINTF_CHECK(format_index, varargs_index)
+#endif
+
// Check number width.
inline bool is_intn(unsigned n, int64_t x) {
VIXL_ASSERT((0 < n) && (n < 64));
@@ -155,6 +163,8 @@ int CountLeadingZeros(uint64_t value, int width);
int CountLeadingSignBits(int64_t value, int width);
int CountTrailingZeros(uint64_t value, int width);
int CountSetBits(uint64_t value, int width);
+uint64_t LowestSetBit(uint64_t value);
+bool IsPowerOf2(int64_t value);
// Pointer alignment
// TODO: rename/refactor to make it specific to instructions.
@@ -167,21 +177,31 @@ bool IsWordAligned(T pointer) {
// Increment a pointer until it has the specified alignment.
template<class T>
T AlignUp(T pointer, size_t alignment) {
- VIXL_STATIC_ASSERT(sizeof(pointer) == sizeof(uintptr_t));
- uintptr_t pointer_raw = reinterpret_cast<uintptr_t>(pointer);
+ // Use C-style casts to get static_cast behaviour for integral types (T), and
+ // reinterpret_cast behaviour for other types.
+
+ uintptr_t pointer_raw = (uintptr_t)pointer;
+ VIXL_STATIC_ASSERT(sizeof(pointer) == sizeof(pointer_raw));
+
size_t align_step = (alignment - pointer_raw) % alignment;
VIXL_ASSERT((pointer_raw + align_step) % alignment == 0);
- return reinterpret_cast<T>(pointer_raw + align_step);
+
+ return (T)(pointer_raw + align_step);
}
// Decrement a pointer until it has the specified alignment.
template<class T>
T AlignDown(T pointer, size_t alignment) {
- VIXL_STATIC_ASSERT(sizeof(pointer) == sizeof(uintptr_t));
- uintptr_t pointer_raw = reinterpret_cast<uintptr_t>(pointer);
+ // Use C-style casts to get static_cast behaviour for integral types (T), and
+ // reinterpret_cast behaviour for other types.
+
+ uintptr_t pointer_raw = (uintptr_t)pointer;
+ VIXL_STATIC_ASSERT(sizeof(pointer) == sizeof(pointer_raw));
+
size_t align_step = pointer_raw % alignment;
VIXL_ASSERT((pointer_raw - align_step) % alignment == 0);
- return reinterpret_cast<T>(pointer_raw - align_step);
+
+ return (T)(pointer_raw - align_step);
}
--
1.9.1
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- [Qemu-devel] [PATCH] disas/libvixl: Update to upstream VIXL 1.5,
Peter Maydell <=