138 lines
4.7 KiB
C++
138 lines
4.7 KiB
C++
//---
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// fxos.target: The target which is being studied
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//---
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#ifndef LIBFXOS_TARGET_H
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#define LIBFXOS_TARGET_H
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#include <fxos/memory.h>
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#include <fxos/util.h>
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#include <vector>
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#include <cstdint>
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namespace FxOS {
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class OS;
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/* A common interface for simulated memory */
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class AbstractMemory
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{
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public:
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/* Checks if an address or interval is simulated */
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virtual bool covers(uint32_t addr, int size=1) const noexcept = 0;
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/* Returns the data located at the provided virtual address. Throws
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std::out_of_range if the interval is not entirely simulated */
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virtual char const *translate(uint32_t addr, int size=1) const = 0;
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/* Read data from the memory. The following methods read data of
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various types. (Not a template because of the restriction about
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template specialization in non-namespaces scopes still in g++.)
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When reading data, provide a virtual address. The addres is saved in
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the returned object for later printing or inspection. The returned
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object Addressable<T> automatically converts to T when used, and
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supports operator & which returns the original address.
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The size parameter is only meaningful for variable-sized types such
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as string, and ignored for fixed-size types such as integers. If the
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desired object is not within the range of the simulated memory,
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throws std::out_of_range. */
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/* Read integers with signed or unsigned extension. These functions do
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not check alignment, because exceptionnally the processor supports
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unaligned operations (eg. movual.l). */
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Addressable<int8_t> read_i8 (uint32_t addr) const;
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Addressable<uint8_t> read_u8 (uint32_t addr) const;
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Addressable<int16_t> read_i16(uint32_t addr) const;
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Addressable<uint16_t> read_u16(uint32_t addr) const;
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Addressable<int32_t> read_i32(uint32_t addr) const;
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Addressable<uint32_t> read_u32(uint32_t addr) const;
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/* Read a non-NUL-terminated string */
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Addressable<std::string> read_str(uint32_t addr, size_t len) const;
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/* Search a binary pattern in the specified area. Returns the virtual
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address of the first occurrence if any is found, [end] otherwise. */
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virtual uint32_t search(uint32_t start, uint32_t end,
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void const *pattern, int size) const = 0;
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};
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/* A binding of a data buffer into a memory region of the target. */
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struct Binding: public AbstractMemory
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{
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/* Constructor from data buffer. An error is raised if the buffer is
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not at least of the size of the region. In this case, a new buffer
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can be constructed with the required size. */
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Binding(MemoryRegion const ®ion, Buffer const &buffer);
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/* Targeted region, might overlap with other bindings */
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MemoryRegion region;
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/* Actual data. This area must have at least [size] bytes */
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void const *data;
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/* Binding size (equal to the region size) */
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uint32_t size;
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/* Checks if an address is covered by the binding */
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bool covers(uint32_t addr, int size=1) const noexcept override;
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/* Returns this process' address (in [data]) corresponding to the
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provided virtual address */
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char const *translate(uint32_t addr, int size=1) const override;
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/* Search a pattern */
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uint32_t search(uint32_t start, uint32_t end, void const *pattern,
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int size) const override;
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};
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/* A composite target where regions can be bound dynamically */
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class Target: public AbstractMemory
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{
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public:
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/* Create an empty target with no regions */
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Target();
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/* Bind an OS. This is used to either disassemble the OS itself, or
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select the OS version for which code is being disassembled (for
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instance for add-ins). */
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void bind_os(OS &os);
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/* Bind a memory region from a buffer. The region can either be
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standard (see <fxos/memory.h>) or custom.
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If several loaded regions overlap on some addresses, *the last
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loaded region will be used*. Thus, new regions can be loaded to
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selectively override parts of the target.
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Generally it is preferable to bind an OS image to the target's ROM
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area using bind_os(), rather than using bind_region(). This is
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because bind_os() which will also enable OS-specific tasks such as
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syscall resolution.
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An error is raised if the buffer is smaller than the region being
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bound. */
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void bind_region(MemoryRegion const ®ion, Buffer const &buffer);
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/* Check if an address is bound */
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bool covers(uint32_t addr, int size=1) const noexcept override;
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/* Returns the data at the provided virtual address */
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char const *translate(uint32_t addr, int size=1) const override;
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/* Search a pattern */
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uint32_t search(uint32_t start, uint32_t end, void const *pattern,
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int size) const override;
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private:
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/* Bound OS image */
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OS *m_os;
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/* Bound regions (in order of binding) */
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std::vector<Binding> m_bindings;
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};
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} /* namespace FxOS */
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#endif /* LIBFXOS_TARGET_H */
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