-/* Parameters for execution on a Hewlett-Packard PA-RISC machine, running
- HPUX or BSD.
- Copyright (C) 1986, 1987, 1989, 1990, 1991 Free Software Foundation, Inc.
-
- Contributed by the Center for Software Science at the
- University of Utah (pa-gdb-bugs@cs.utah.edu).
-
-This file is part of GDB.
-
-GDB is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 1, or (at your option)
-any later version.
-
-GDB is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GDB; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-
-/* Get at various relevent fields of an instruction word. */
-
-#define MASK_5 0x1f
-#define MASK_11 0x7ff
-#define MASK_14 0x3fff
-#define MASK_21 0x1fffff
-
-/* This macro gets bit fields using HP's numbering (MSB = 0) */
-
-#define GET_FIELD(X, FROM, TO) \
- ((X) >> 31 - (TO) & (1 << ((TO) - (FROM) + 1)) - 1)
-
-/* Watch out for NaNs */
-
-#define IEEE_FLOAT
-
-/* Groan */
-
-#define ARGS_GROW_DOWN
-
-/* Get rid of any system-imposed stack limit if possible. */
-
-
-
-/* Define this if the C compiler puts an underscore at the front
- of external names before giving them to the linker. */
-
-/* #define NAMES_HAVE_UNDERSCORE */
-
-/* Debugger information will be in DBX format. */
-
-#define READ_DBX_FORMAT
-
-/* Offset from address of function to start of its code.
- Zero on most machines. */
-
-#define FUNCTION_START_OFFSET 0
-
-/* Advance PC across any function entry prologue instructions
- to reach some "real" code. */
-
-/* skip (stw rp, -20(0,sp)); copy 4,1; copy sp, 4; stwm 1,framesize(sp)
- for gcc, or (stw rp, -20(0,sp); stwm 1, framesize(sp) for hcc */
-
-#define SKIP_PROLOGUE(pc) \
-{ if (read_memory_integer ((pc), 4) == 0x6BC23FD9) \
- { if (read_memory_integer ((pc) + 4, 4) == 0x8040241) \
- (pc) += 16; \
- else if ((read_memory_integer (pc + 4, 4) & ~MASK_14) == 0x68810000) \
- (pc) += 8;} \
- else if (read_memory_integer ((pc), 4) == 0x8040241) \
- (pc) += 12; \
- else if ((read_memory_integer (pc, 4) & ~MASK_14) == 0x68810000) \
- (pc) += 4;}
-
-/* Immediately after a function call, return the saved pc.
- Can't go through the frames for this because on some machines
- the new frame is not set up until the new function executes
- some instructions. */
-
-
-#define SAVED_PC_AFTER_CALL(frame) \
- ((get_frame_pc (frame) >= millicode_start \
- && get_frame_pc (frame) < millicode_end) ? \
- read_register (31) & ~3 \
- : read_register (RP_REGNUM) & ~3)
-
-/* Address of end of stack space. Who knows. */
-
-#define STACK_END_ADDR 0x80000000
-
-/* Stack grows upward */
-
-#define INNER_THAN >
-
-
-/* Sequence of bytes for breakpoint instruction. */
-
-/*#define BREAKPOINT {0x00, 0x00, 0x00, 0x00}*/
-#ifdef KERNELDEBUG /* XXX */
-#define BREAKPOINT {0x00, 0x00, 0xa0, 0x00}
-#else
-#define BREAKPOINT {0x00, 0x01, 0x00, 0x04}
-#endif
-
-/* Amount PC must be decremented by after a breakpoint.
- This is often the number of bytes in BREAKPOINT
- but not always.
-
- Not on the PA-RISC */
-
-#define DECR_PC_AFTER_BREAK 0
-
-/* return instruction is bv r0(rp) */
-
-#define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 4) == 0xE840C000)
-
-/* Return 1 if P points to an invalid floating point value. */
-
-#define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */
-
-/* Largest integer type */
-#define LONGEST long
-
-/* Name of the builtin type for the LONGEST type above. */
-#define BUILTIN_TYPE_LONGEST builtin_type_long
-
-/* Say how long (ordinary) registers are. */
-
-#define REGISTER_TYPE long
-
-/* Number of machine registers */
-
-#define NUM_REGS 100
-
-/* Initializer for an array of names of registers.
- There should be NUM_REGS strings in this initializer. */
-
-#define REGISTER_NAMES \
- {"flags", "r1", "rp", "r3", "r4", "r5", "r6", "r7", "r8", "r9", \
- "r10", "r11", "r12", "r13", "r14", "r15", "r16", "r17", "r18", "r19", \
- "r20", "r21", "r22", "arg3", "arg2", "arg1", "arg0", "dp", "ret0", "ret1", \
- "sp", "r31", "sar", "pcoqh", "pcsqh", "pcoqt", "pcsqt", \
- "eiem", "iir", "isr", "ior", "ipsw", "goto", "sr4", "sr0", "sr1", "sr2", \
- "sr3", "sr5", "sr6", "sr7", "cr0", "cr8", "cr9", "ccr", "cr12", "cr13", \
- "cr24", "cr25", "cr26", "mpsfu_high", "mpsfu_low", "mpsfu_ovflo", "pad", \
- "fpsr", "fpe1", "fpe2", "fpe3", "fpe4", "fpe5", "fpe6", "fpe7", \
- "fp4", "fp5", "fp6", "fp7", "fp8", \
- "fp9", "fp10", "fp11", "fp12", "fp13", "fp14", "fp15", \
- "fp16", "fp17", "fp18", "fp19", "fp20", "fp21", "fp22", "fp23", \
- "fp24", "fp25", "fp26", "fp27", "fp28", "fp29", "fp30", "fp31"}
-
-
-
-/* Register numbers of various important registers.
- Note that some of these values are "real" register numbers,
- and correspond to the general registers of the machine,
- and some are "phony" register numbers which are too large
- to be actual register numbers as far as the user is concerned
- but do serve to get the desired values when passed to read_register. */
-
-#define RP_REGNUM 2 /* return pointer */
-#define FP_REGNUM 4 /* Contains address of executing stack */
- /* frame */
-#define SP_REGNUM 30 /* Contains address of top of stack */
-#define SAR_REGNUM 32 /* shift amount register */
-#define IPSW_REGNUM 41 /* processor status word. ? */
-#define PCOQ_HEAD_REGNUM 33 /* instruction offset queue head */
-#define PCSQ_HEAD_REGNUM 34 /* instruction space queue head */
-#define PCOQ_TAIL_REGNUM 35 /* instruction offset queue tail */
-#define PCSQ_TAIL_REGNUM 36 /* instruction space queue tail */
-#define FP0_REGNUM 64 /* floating point reg. 0 */
-#define FP4_REGNUM 72
-
-/* compatibility with the rest of gdb. */
-#define PC_REGNUM PCOQ_HEAD_REGNUM
-#define NPC_REGNUM PCOQ_TAIL_REGNUM
-
-/* Define DO_REGISTERS_INFO() to do machine-specific formatting
- of register dumps. */
-
-#define DO_REGISTERS_INFO(_regnum, fp) pa_do_registers_info (_regnum, fp)
-
-/* PA specific macro to see if the current instruction is nullified. */
-#define INSTRUCTION_NULLIFIED ((int)read_register (IPSW_REGNUM) & 0x00200000)
-
-/* Total amount of space needed to store our copies of the machine's
- register state, the array `registers'. */
-#define REGISTER_BYTES (32 * 4 + 11 * 4 + 8 * 4 + 12 * 4 + 4 + 32 * 8)
-
-/* Index within `registers' of the first byte of the space for
- register N. */
-
-#define REGISTER_BYTE(N) \
- ((N) >= FP4_REGNUM ? ((N) - FP4_REGNUM) * 8 + 288 : (N) * 4)
-
-/* Number of bytes of storage in the actual machine representation
- for register N. On the PA-RISC, all regs are 4 bytes
- except the floating point regs which are 8 bytes. */
-
-#define REGISTER_RAW_SIZE(N) ((N) < FP4_REGNUM ? 4 : 8)
-
-/* Number of bytes of storage in the program's representation
- for register N. */
-
-#define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
-
-/* Largest value REGISTER_RAW_SIZE can have. */
-
-#define MAX_REGISTER_RAW_SIZE 8
-
-/* Largest value REGISTER_VIRTUAL_SIZE can have. */
-
-#define MAX_REGISTER_VIRTUAL_SIZE 8
-
-/* Nonzero if register N requires conversion
- from raw format to virtual format. */
-
-#define REGISTER_CONVERTIBLE(N) 0
-
-/* Convert data from raw format for register REGNUM
- to virtual format for register REGNUM. */
-
-#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
-{ bcopy ((FROM), (TO), (REGNUM) < FP4_REGNUM ? 4 : 8); }
-
-/* Convert data from virtual format for register REGNUM
- to raw format for register REGNUM. */
-
-#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
-{ bcopy ((FROM), (TO), (REGNUM) < FP4_REGNUM ? 4 : 8); }
-
-/* Return the GDB type object for the "standard" data type
- of data in register N. */
-
-#define REGISTER_VIRTUAL_TYPE(N) \
- ((N) < FP4_REGNUM ? builtin_type_int : builtin_type_double)
-
-/* Store the address of the place in which to copy the structure the
- subroutine will return. This is called from call_function. */
-
-#define STORE_STRUCT_RETURN(ADDR, SP) {write_register (28, (ADDR)); }
-
-/* Extract from an array REGBUF containing the (raw) register state
- a function return value of type TYPE, and copy that, in virtual format,
- into VALBUF. */
-
-#define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
- bcopy ((REGBUF) + REGISTER_BYTE(TYPE_LENGTH(TYPE) > 4 ? \
- FP4_REGNUM :28), VALBUF, TYPE_LENGTH (TYPE))
-
-/* Write into appropriate registers a function return value
- of type TYPE, given in virtual format. */
-
-#define STORE_RETURN_VALUE(TYPE,VALBUF) \
- write_register_bytes (TYPE_LENGTH(TYPE) > 4 ? FP4_REGNUM :28, \
- VALBUF, TYPE_LENGTH (TYPE))
-
-/* Extract from an array REGBUF containing the (raw) register state
- the address in which a function should return its structure value,
- as a CORE_ADDR (or an expression that can be used as one). */
-
-#define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)((REGBUF) + 28))
-
-/* This is a piece of magic that is given a register number REGNO
- and as BLOCKEND the address in the system of the end of the user structure
- and stores in ADDR the address in the kernel or core dump
- of that register. */
-
-
-/* Describe the pointer in each stack frame to the previous stack frame
- (its caller). */
-
-/* FRAME_CHAIN takes a frame's nominal address
- and produces the frame's chain-pointer.
-
- FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
- and produces the nominal address of the caller frame.
-
- However, if FRAME_CHAIN_VALID returns zero,
- it means the given frame is the outermost one and has no caller.
- In that case, FRAME_CHAIN_COMBINE is not used. */
-
-/* In the case of the PA-RISC, the frame's nominal address
- is the address of a 4-byte word containing the calling frame's
- address (previous FP). */
-
-#define FRAME_CHAIN(thisframe) \
- (inside_entry_file ((thisframe)->pc) ? \
- read_memory_integer ((thisframe)->frame, 4) :\
- 0)
-
-#define FRAME_CHAIN_VALID(chain, thisframe) \
- frame_chain_valid (chain, thisframe)
-
-#define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
-
-/* Define other aspects of the stack frame. */
-
-/* A macro that tells us whether the function invocation represented
- by FI does not have a frame on the stack associated with it. If it
- does not, FRAMELESS is set to 1, else 0. */
-#define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
- (FRAMELESS) = frameless_look_for_prologue(FI)
-
-#define FRAME_SAVED_PC(FRAME) frame_saved_pc (FRAME)
-
-#define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
-
-#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
-/* Set VAL to the number of args passed to frame described by FI.
- Can set VAL to -1, meaning no way to tell. */
-
-/* We can't tell how many args there are
- now that the C compiler delays popping them. */
-#define FRAME_NUM_ARGS(val,fi) (val = -1)
-
-/* Return number of bytes at start of arglist that are not really args. */
-
-#define FRAME_ARGS_SKIP 0
-
-/* Put here the code to store, into a struct frame_saved_regs,
- the addresses of the saved registers of frame described by FRAME_INFO.
- This includes special registers such as pc and fp saved in special
- ways in the stack frame. sp is even more special:
- the address we return for it IS the sp for the next frame. */
-
-/* Deal with dummy functions later. */
-
-#define STW_P(INSN) (((INSN) & 0xfc000000) == 0x68000000)
-#define ADDIL_P(INSN) (((INSN) & 0xfc000000) == 0x28000000)
-#define LDO_P(INSN) (((INSN) & 0xfc00c000) == 0x34000000)
-
-int millicode_start, millicode_end;
-
-#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
-{ register int regnum; \
- register CORE_ADDR next_addr; \
- register CORE_ADDR pc; \
- unsigned this_insn; \
- unsigned address; \
- \
- bzero (&frame_saved_regs, sizeof frame_saved_regs); \
- if ((frame_info)->pc <= ((frame_info)->frame - CALL_DUMMY_LENGTH - \
- FP_REGNUM * 4 - 16 * 8) \
- && (frame_info)->pc > (frame_info)->frame) \
- find_dummy_frame_regs ((frame_info), &(frame_saved_regs)); \
- else \
- { pc = get_pc_function_start ((frame_info)->pc); \
- if (read_memory_integer (pc, 4) == 0x6BC23FD9) \
- { (frame_saved_regs).regs[RP_REGNUM] = (frame_info)->frame - 20;\
- pc = pc + 4; \
- } \
- if (read_memory_integer (pc, 4) != 0x8040241) goto lose; \
- pc += 8; /* skip "copy 4,1; copy 30, 4" */ \
- /* skip either "stw 1,0(4);addil L'fsize,30;ldo R'fsize(1),30" \
- or "stwm 1,fsize(30)" */ \
- if ((read_memory_integer (pc, 4) & ~MASK_14) == 0x68810000) \
- pc += 12; \
- else \
- pc += 4; \
- while (1) \
- { this_insn = read_memory_integer(pc, 4); \
- if (STW_P (this_insn)) /* stw */ \
- { regnum = GET_FIELD (this_insn, 11, 15); \
- if (!regnum) goto lose; \
- (frame_saved_regs).regs[regnum] = (frame_info)->frame + \
- extract_14 (this_insn); \
- pc += 4; \
- } \
- else if (ADDIL_P (this_insn)) /* addil */ \
- { int next_insn; \
- next_insn = read_memory_integer(pc + 4, 4); \
- if (STW_P (next_insn)) /* stw */ \
- { regnum = GET_FIELD (this_insn, 6, 10); \
- if (!regnum) goto lose; \
- (frame_saved_regs).regs[regnum] = (frame_info)->frame +\
- (extract_21 (this_insn) << 11) + extract_14 (next_insn);\
- pc += 8; \
- } \
- else \
- break; \
- } \
- else \
- { pc += 4; \
- break; \
- } \
- } \
- this_insn = read_memory_integer (pc, 4); \
- if (LDO_P (this_insn)) \
- { next_addr = (frame_info)->frame + extract_14 (this_insn); \
- pc += 4; \
- } \
- else if (ADDIL_P (this_insn)) \
- { next_addr = (frame_info)->frame + (extract_21 (this_insn) << 11)\
- + extract_14 (read_memory_integer (pc + 4, 4)); \
- pc += 8; \
- } \
- while (1) \
- { this_insn = read_memory_integer (pc, 4); \
- if ((this_insn & 0xfc001fe0) == 0x2c001220) /* fstds,ma */ \
- { regnum = GET_FIELD (this_insn, 27, 31); \
- (frame_saved_regs).regs[regnum + FP0_REGNUM] = next_addr; \
- next_addr += 8; \
- } \
- else \
- break; \
- } \
- lose: \
- (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame; \
- (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame -4; \
- }}
-\f
-/* Things needed for making the inferior call functions. */
-
-/* Push an empty stack frame, to record the current PC, etc. */
-
-#define PUSH_DUMMY_FRAME \
-{ register CORE_ADDR sp = read_register (SP_REGNUM); \
- register int regnum; \
- int int_buffer; \
- double freg_buffer; \
- /* Space for "arguments"; the RP goes in here. */ \
- sp += 48; \
- int_buffer = read_register (RP_REGNUM) | 0x3; \
- write_memory (sp - 20, &int_buffer, 4); \
- int_buffer = read_register (FP_REGNUM); \
- write_memory (sp, &int_buffer, 4); \
- write_register (FP_REGNUM, sp); \
- sp += 4; \
- for (regnum = 1; regnum < 31; regnum++) \
- if (regnum != RP_REGNUM && regnum != FP_REGNUM) \
- sp = push_word (sp, read_register (regnum)); \
- for (regnum = FP0_REGNUM; regnum < NUM_REGS; regnum++) \
- { read_register_bytes (REGISTER_BYTE (regnum), &freg_buffer, 8); \
- sp = push_bytes (sp, &freg_buffer, 8);} \
- sp = push_word (sp, read_register (IPSW_REGNUM)); \
- sp = push_word (sp, read_register (SAR_REGNUM)); \
- sp = push_word (sp, read_register (PCOQ_TAIL_REGNUM)); \
- sp = push_word (sp, read_register (PCSQ_TAIL_REGNUM)); \
- write_register (SP_REGNUM, sp);}
-
-/* Discard from the stack the innermost frame,
- restoring all saved registers. */
-#define POP_FRAME \
-{ register FRAME frame = get_current_frame (); \
- register CORE_ADDR fp; \
- register int regnum; \
- struct frame_saved_regs fsr; \
- struct frame_info *fi; \
- double freg_buffer; \
- fi = get_frame_info (frame); \
- fp = fi->frame; \
- get_frame_saved_regs (fi, &fsr); \
- for (regnum = 31; regnum > 0; regnum--) \
- if (fsr.regs[regnum]) \
- write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
- for (regnum = NUM_REGS - 1; regnum >= FP0_REGNUM ; regnum--) \
- if (fsr.regs[regnum]) \
- { read_memory (fsr.regs[regnum], &freg_buffer, 8); \
- write_register_bytes (REGISTER_BYTE (regnum), &freg_buffer, 8); }\
- if (fsr.regs[IPSW_REGNUM]) \
- write_register (IPSW_REGNUM, \
- read_memory_integer (fsr.regs[IPSW_REGNUM], 4)); \
- if (fsr.regs[SAR_REGNUM]) \
- write_register (SAR_REGNUM, \
- read_memory_integer (fsr.regs[SAR_REGNUM], 4)); \
- if (fsr.regs[PCOQ_TAIL_REGNUM]) \
- write_register (PCOQ_TAIL_REGNUM, \
- read_memory_integer (fsr.regs[PCOQ_TAIL_REGNUM], 4));\
- if (fsr.regs[PCSQ_TAIL_REGNUM]) \
- write_register (PCSQ_TAIL_REGNUM, \
- read_memory_integer (fsr.regs[PCSQ_TAIL_REGNUM], 4));\
- write_register (FP_REGNUM, read_memory_integer (fp, 4)); \
- write_register (SP_REGNUM, fp + 8); \
- flush_cached_frames (); \
- set_current_frame (create_new_frame (read_register (FP_REGNUM),\
- read_pc ())); }
-
-/* This sequence of words is the instructions
-
-; Call stack frame has already been built by gdb. Since we could be calling
-; a varargs function, and we do not have the benefit of a stub to put things in
-; the right place, we load the first 4 word of arguments into both the general
-; and fp registers.
-call_dummy
- ldw -36(sp), arg0
- ldw -40(sp), arg1
- ldw -44(sp), arg2
- ldw -48(sp), arg3
- ldo -36(sp), r1
- fldws 0(0, r1), fr4
- fldds -4(0, r1), fr5
- fldws -8(0, r1), fr6
- fldds -12(0, r1), fr7
- ldil 0, r22 ; target will be placed here.
- ldo 0(r22), r22
- ldsid (0,r22), r3
- ldil 0, r1 ; _sr4export will be placed here.
- ldo 0(r1), r1
- ldsid (0,r1), r4
- combt,=,n r3, r4, text_space ; If target is in data space, do a
- ble 0(sr5, r22) ; "normal" procedure call
- copy r31, r2
- break 4, 8
-text_space ; Otherwise, go through _sr4export,
- ble (sr4, r1) ; which will return back here.
- stw 31,-24(r30)
- break 4, 8
-
- The dummy decides if the target is in text space or data space. If
- it's in data space, there's no problem because the target can
- return back to the dummy. However, if the target is in text space,
- the dummy calls the secret, undocumented routine _sr4export, which
- calls a function in text space and can return to any space. Instead
- of including fake instructions to represent saved registers, we
- know that the frame is associated with the call dummy and treat it
- specially. */
-
-#define CALL_DUMMY { 0x4bda3fb9, 0x4bd93fb1, 0x4bd83fa9, 0x4bd73fa1, \
- 0x37c13fb9, 0x24201004, 0x2c391005, 0x24311006, \
- 0x2c291007, 0x22c00000, 0x36d60000, 0x02c010a3, \
- 0x20200000, 0x34210000, 0x002010a4, 0x80832012, \
- 0xe6c06000, 0x081f0242, 0x00010004, 0xe4202000, \
- 0x6bdf3fd1, 0x00010004}
-
-#define CALL_DUMMY_LENGTH 88
-#define CALL_DUMMY_START_OFFSET 0
-/* Insert the specified number of args and function address
- into a call sequence of the above form stored at DUMMYNAME. */
-
-#define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
-{ static CORE_ADDR sr4export_address = 0; \
- \
- if (!sr4export_address) \
- { \
- struct minimal_symbol *msymbol; \
- msymbol = lookup_minimal_symbol ("_sr4export", (struct objfile *) NULL);\
- if (msymbol = NULL) \
- error ("Can't find an address for _sr4export trampoline"); \
- else \
- sr4export_address = msymbol -> address; \
- } \
- dummyname[9] = deposit_21 (fun >> 11, dummyname[9]); \
- dummyname[10] = deposit_14 (fun & MASK_11, dummyname[10]); \
- dummyname[12] = deposit_21 (sr4export_address >> 11, dummyname[12]); \
- dummyname[13] = deposit_14 (sr4export_address & MASK_11, dummyname[13]);\
-}
-
-/* Write the PC to a random value.
- On PA-RISC, we need to be sure that the PC space queue is correct. */
-
-#define WRITE_PC(addr) \
-{ int space_reg, space = ((addr) >> 30); \
- int space_val; \
- if (space == 0) \
- space_reg = 43; /* Space reg sr4 */ \
- else if (space == 1) \
- space_reg = 48; /* Space reg sr5*/ \
- else \
- error ("pc = %x is in illegal space.", addr); \
- space_val = read_register (space_reg); \
- write_register (PCOQ_HEAD_REGNUM, addr); \
- write_register (PCSQ_HEAD_REGNUM, space_val); \
- write_register (PCOQ_TAIL_REGNUM, addr); \
- write_register (PCSQ_TAIL_REGNUM, space_val);}
-
-
-
-
-
-
projects / deliverable / binutils-gdb.git / blobdiff