218 lines
7.9 KiB
Plaintext
Executable File
218 lines
7.9 KiB
Plaintext
Executable File
README-instrumentation
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To use instrumentation features in bochs, you must compile in support for it.
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You should build a custom instrumentation library in a separate directory in
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the "instrument/" directory. To tell configure which instrumentation library
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you want to use, use the "--enable-instrumentation" option. The default
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library consists of a set of stubs, and the following are equivalent:
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./configure [...] --enable-instrumentation
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./configure [...] --enable-instrumentation="instrument/stubs"
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You could make a separate directory with your custom library, for example
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"instrument/myinstrument", copy the contents of the "instrument/stubs"
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directory to it, then customize it. Use:
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./configure [...] --enable-instrumentation="instrument/myinstrument"
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-----------------------------------------------------------------------------
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BOCHS instrumentation callbacks
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void bx_instr_init(unsigned cpu);
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The callback is called each time, when Bochs initializes the CPU object. It
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can be used for initialization of user's data, dynamic memory allocation and
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etc.
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void bx_instr_shutdown(unsigned cpu);
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The callback is called each time, when Bochs destructs the CPU object. It can
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be used for destruction of user's data, allocated by bx_instr_init callback.
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void bx_instr_reset(unsigned cpu);
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The callback is called each time, when Bochs resets the CPU object. It would
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be executed once at the start of simulation and each time that user presses
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RESET BUTTON on the simulator's control panel.
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void bx_instr_new_instruction(unsigned cpu);
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The callback is called each time, when Bochs completes (commits) already
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finished instruction and starts a new one.
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void bx_instr_cnear_branch_taken(unsigned cpu, bx_address new_eip);
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The callback is called each time, when currently executed instruction is a
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conditional near branch and it is taken.
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void bx_instr_cnear_branch_not_taken(unsigned cpu);
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The callback is called each time, when currently executed instruction is a
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conditional near branch and it is not taken.
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void bx_instr_ucnear_branch(unsigned cpu, unsigned what, bx_address new_eip);
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The callback is called each time, when currently executed instruction is an
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unconditional near branch (always taken).
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void bx_instr_far_branch(unsigned cpu, unsigned what, Bit16u new_cs, bx_address new_eip);
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The callback is called each time, when currently executed instruction is an
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unconditional far branch (always taken).
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void bx_instr_opcode(unsigned cpu, Bit8u *opcode, unsigned len, Boolean is32);
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The callback is called each time, when Bochs starts to decode a new
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instruction. Through this callback function Bochs could provide an opcode of
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the instruction, opcode length and an execution mode (16/32).
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void bx_instr_fetch_decode_completed(unsigned cpu, bxInstruction_c *i);
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The callback is called each time, when Bochs finishes decoding of new
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instruction. Through this callback function Bochs could provide decoding
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information of the instruction. The bxInstruction_c argument of the callbacks
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it is a Bochs internal structure that holds all necessary information about
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currently executed instruction, such as sib/modrm bytes, execution pointer and
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etc.
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void bx_instr_prefix_as(unsigned cpu);
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void bx_instr_prefix_os(unsigned cpu);
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void bx_instr_prefix_rep(unsigned cpu);
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void bx_instr_prefix_repne(unsigned cpu);
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void bx_instr_prefix_lock(unsigned cpu);
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void bx_instr_prefix_cs(unsigned cpu);
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void bx_instr_prefix_ss(unsigned cpu);
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void bx_instr_prefix_ds(unsigned cpu);
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void bx_instr_prefix_es(unsigned cpu);
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void bx_instr_prefix_fs(unsigned cpu);
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void bx_instr_prefix_gs(unsigned cpu);
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These callback functions are called by Bochs decoding stage each time, when
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corresponding prefix was decoded.
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void bx_instr_interrupt(unsigned cpu, unsigned vector);
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The callback is called each time, when Bochs simulator executes an interrupt
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(software interrupt, hardware interrupt or an exception).
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void bx_instr_exception(unsigned cpu, unsigned vector);
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The callback is called each time, when Bochs simulator executes an exception.
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void bx_instr_hwinterrupt(unsigned cpu, unsigned vector, Bit16u cs, bx_address eip);
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The callback is called each time, when Bochs simulator executes a hardware
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interrupt.
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void bx_instr_tlb_cntrl(unsigned cpu, unsigned what, Bit32u newval);
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void bx_instr_cache_cntrl(unsigned cpu, unsigned what);
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The callback is called each time, when Bochs simulator executes a cache/tlb
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control instruction.
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Possible instruction types, passed through bx_instr_tlb_cntrl:
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#define BX_INSTR_MOV_CR3 10
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#define BX_INSTR_INVLPG 11
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#define BX_INSTR_TASKSWITCH 12
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Possible instruction types, passed through bx_instr_cache_cntrl:
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#define BX_INSTR_INVD 20
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#define BX_INSTR_WBINVD 21
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void bx_instr_prefetch_hint(unsigned cpu, unsigned what, unsigned seg, bx_address offset);
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The callback is called each time, when Bochs simulator executes a PREFETCH
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instruction.
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Possible PREFETCH types:
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#define BX_INSTR_PREFETCH_NTA 00
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#define BX_INSTR_PREFETCH_T0 01
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#define BX_INSTR_PREFETCH_T1 02
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#define BX_INSTR_PREFETCH_T2 03
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The seg/offset arguments indicate the address of the requested prefetch.
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void bx_instr_repeat_iteration(unsigned cpu);
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The callback is called each time, when Bochs simulator starts a new repeat
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iteration.
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void bx_instr_mem_code(unsigned cpu, bx_address linear, unsigned len);
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void bx_instr_mem_data(unsigned cpu, bx_address linear, unsigned len, unsigned rw);
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The callback is called each time, when Bochs simulator executes code or data
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memory access. Possible access types are: BX_READ, BX_WRITE and BX_RW.
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void bx_instr_lin_read(unsigned cpu, bx_address lin, bx_address phy, unsigned len);
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void bx_instr_lin_write(unsigned cpu, bx_address lin, bx_address phy, unsigned len);
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The callback is called each time, when Bochs simulator executes a memory
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access. Note that no page split accesses will be generated because Bochs
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splits page split accesses to two different memory accesses during its
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execution flow.
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Currently the callbacks are not supported in case of guest-to-host-tlb feature
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enabled.
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void bx_instr_phy_read(unsigned cpu, bx_address addr, unsigned len);
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void bx_instr_phy_write(unsigned cpu, bx_address addr, unsigned len);
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These callback functions are a feedback from external memory system.
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void bx_instr_inp(Bit16u addr, unsigned len);
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void bx_instr_outp(Bit16u addr, unsigned len);
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void bx_instr_inp2(Bit16u addr, unsigned len, unsigned val);
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void bx_instr_outp2(Bit16u addr, unsigned len, unsigned val);
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These callback functions are a feedback from various system devices.
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-----------------------------------------------------------------------------
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Known problems:
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1. BX_INSTR_MEM_CODE never called from Bochs's code.
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2. BX_INSTR_LIN_READ doesn't work when Guest-To-Host-TLB feature is enabled.
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3. BX_INSTR_LIN_WRITE doesn't work when Guest-To-Host-TLB feature is enabled.
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4.
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While using Bochs as a reference model for simulations, the simulator needs
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information about what loads/stores are taking place with each instruction.
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Presumably, that is what the BX_INSTR_MEM_DATA() instrumentation macros
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cover (which is the place where our simulator hooks up).
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The RETnear_xxx() functions call access_linear() directly, rather than call
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read_virtual_xxx() functions. This is a problem for code making use of the
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BX_INSTR_MEM_DATA() hook because it does not get called for these
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instructions. Should this be changed along with some other instructions
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that exhibit this?
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Brian Slechta
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Feature requests:
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1. BX_INSTR_CNEAR_BRANCH_NOT_TAKEN callback should have an additional
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'not taken' new_EIP parameter.
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2. BX_INSTR_WRMSR callback
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