| /* Target-dependent code for Atmel AVR, for GDB. |
| Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 |
| Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program 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 2 of the License, or |
| (at your option) any later version. |
| |
| This program 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 this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| /* Contributed by Theodore A. Roth, troth@verinet.com */ |
| |
| /* Portions of this file were taken from the original gdb-4.18 patch developed |
| by Denis Chertykov, denisc@overta.ru */ |
| |
| #include "defs.h" |
| #include "gdbcmd.h" |
| #include "gdbcore.h" |
| #include "inferior.h" |
| #include "symfile.h" |
| #include "arch-utils.h" |
| #include "regcache.h" |
| #include "gdb_string.h" |
| |
| /* AVR Background: |
| |
| (AVR micros are pure Harvard Architecture processors.) |
| |
| The AVR family of microcontrollers have three distinctly different memory |
| spaces: flash, sram and eeprom. The flash is 16 bits wide and is used for |
| the most part to store program instructions. The sram is 8 bits wide and is |
| used for the stack and the heap. Some devices lack sram and some can have |
| an additional external sram added on as a peripheral. |
| |
| The eeprom is 8 bits wide and is used to store data when the device is |
| powered down. Eeprom is not directly accessible, it can only be accessed |
| via io-registers using a special algorithm. Accessing eeprom via gdb's |
| remote serial protocol ('m' or 'M' packets) looks difficult to do and is |
| not included at this time. |
| |
| [The eeprom could be read manually via ``x/b <eaddr + AVR_EMEM_START>'' or |
| written using ``set {unsigned char}<eaddr + AVR_EMEM_START>''. For this to |
| work, the remote target must be able to handle eeprom accesses and perform |
| the address translation.] |
| |
| All three memory spaces have physical addresses beginning at 0x0. In |
| addition, the flash is addressed by gcc/binutils/gdb with respect to 8 bit |
| bytes instead of the 16 bit wide words used by the real device for the |
| Program Counter. |
| |
| In order for remote targets to work correctly, extra bits must be added to |
| addresses before they are send to the target or received from the target |
| via the remote serial protocol. The extra bits are the MSBs and are used to |
| decode which memory space the address is referring to. */ |
| |
| #undef XMALLOC |
| #define XMALLOC(TYPE) ((TYPE*) xmalloc (sizeof (TYPE))) |
| |
| #undef EXTRACT_INSN |
| #define EXTRACT_INSN(addr) extract_unsigned_integer(addr,2) |
| |
| /* Constants: prefixed with AVR_ to avoid name space clashes */ |
| |
| enum |
| { |
| AVR_REG_W = 24, |
| AVR_REG_X = 26, |
| AVR_REG_Y = 28, |
| AVR_FP_REGNUM = 28, |
| AVR_REG_Z = 30, |
| |
| AVR_SREG_REGNUM = 32, |
| AVR_SP_REGNUM = 33, |
| AVR_PC_REGNUM = 34, |
| |
| AVR_NUM_REGS = 32 + 1 /*SREG*/ + 1 /*SP*/ + 1 /*PC*/, |
| AVR_NUM_REG_BYTES = 32 + 1 /*SREG*/ + 2 /*SP*/ + 4 /*PC*/, |
| |
| AVR_PC_REG_INDEX = 35, /* index into array of registers */ |
| |
| AVR_MAX_PROLOGUE_SIZE = 56, /* bytes */ |
| |
| /* Count of pushed registers. From r2 to r17 (inclusively), r28, r29 */ |
| AVR_MAX_PUSHES = 18, |
| |
| /* Number of the last pushed register. r17 for current avr-gcc */ |
| AVR_LAST_PUSHED_REGNUM = 17, |
| |
| /* FIXME: TRoth/2002-01-??: Can we shift all these memory masks left 8 |
| bits? Do these have to match the bfd vma values?. It sure would make |
| things easier in the future if they didn't need to match. |
| |
| Note: I chose these values so as to be consistent with bfd vma |
| addresses. |
| |
| TRoth/2002-04-08: There is already a conflict with very large programs |
| in the mega128. The mega128 has 128K instruction bytes (64K words), |
| thus the Most Significant Bit is 0x10000 which gets masked off my |
| AVR_MEM_MASK. |
| |
| The problem manifests itself when trying to set a breakpoint in a |
| function which resides in the upper half of the instruction space and |
| thus requires a 17-bit address. |
| |
| For now, I've just removed the EEPROM mask and changed AVR_MEM_MASK |
| from 0x00ff0000 to 0x00f00000. Eeprom is not accessible from gdb yet, |
| but could be for some remote targets by just adding the correct offset |
| to the address and letting the remote target handle the low-level |
| details of actually accessing the eeprom. */ |
| |
| AVR_IMEM_START = 0x00000000, /* INSN memory */ |
| AVR_SMEM_START = 0x00800000, /* SRAM memory */ |
| #if 1 |
| /* No eeprom mask defined */ |
| AVR_MEM_MASK = 0x00f00000, /* mask to determine memory space */ |
| #else |
| AVR_EMEM_START = 0x00810000, /* EEPROM memory */ |
| AVR_MEM_MASK = 0x00ff0000, /* mask to determine memory space */ |
| #endif |
| }; |
| |
| /* Any function with a frame looks like this |
| ....... <-SP POINTS HERE |
| LOCALS1 <-FP POINTS HERE |
| LOCALS0 |
| SAVED FP |
| SAVED R3 |
| SAVED R2 |
| RET PC |
| FIRST ARG |
| SECOND ARG */ |
| |
| struct frame_extra_info |
| { |
| CORE_ADDR return_pc; |
| CORE_ADDR args_pointer; |
| int locals_size; |
| int framereg; |
| int framesize; |
| int is_main; |
| }; |
| |
| struct gdbarch_tdep |
| { |
| /* FIXME: TRoth: is there anything to put here? */ |
| int foo; |
| }; |
| |
| /* Lookup the name of a register given it's number. */ |
| |
| static const char * |
| avr_register_name (int regnum) |
| { |
| static char *register_names[] = { |
| "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", |
| "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", |
| "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", |
| "SREG", "SP", "PC" |
| }; |
| if (regnum < 0) |
| return NULL; |
| if (regnum >= (sizeof (register_names) / sizeof (*register_names))) |
| return NULL; |
| return register_names[regnum]; |
| } |
| |
| /* Index within `registers' of the first byte of the space for |
| register REGNUM. */ |
| |
| static int |
| avr_register_byte (int regnum) |
| { |
| if (regnum < AVR_PC_REGNUM) |
| return regnum; |
| else |
| return AVR_PC_REG_INDEX; |
| } |
| |
| /* Number of bytes of storage in the actual machine representation for |
| register REGNUM. */ |
| |
| static int |
| avr_register_raw_size (int regnum) |
| { |
| switch (regnum) |
| { |
| case AVR_PC_REGNUM: |
| return 4; |
| case AVR_SP_REGNUM: |
| case AVR_FP_REGNUM: |
| return 2; |
| default: |
| return 1; |
| } |
| } |
| |
| /* Number of bytes of storage in the program's representation |
| for register N. */ |
| |
| static int |
| avr_register_virtual_size (int regnum) |
| { |
| return TYPE_LENGTH (REGISTER_VIRTUAL_TYPE (regnum)); |
| } |
| |
| /* Return the GDB type object for the "standard" data type |
| of data in register N. */ |
| |
| static struct type * |
| avr_register_virtual_type (int regnum) |
| { |
| switch (regnum) |
| { |
| case AVR_PC_REGNUM: |
| return builtin_type_unsigned_long; |
| case AVR_SP_REGNUM: |
| return builtin_type_unsigned_short; |
| default: |
| return builtin_type_unsigned_char; |
| } |
| } |
| |
| /* Instruction address checks and convertions. */ |
| |
| static CORE_ADDR |
| avr_make_iaddr (CORE_ADDR x) |
| { |
| return ((x) | AVR_IMEM_START); |
| } |
| |
| static int |
| avr_iaddr_p (CORE_ADDR x) |
| { |
| return (((x) & AVR_MEM_MASK) == AVR_IMEM_START); |
| } |
| |
| /* FIXME: TRoth: Really need to use a larger mask for instructions. Some |
| devices are already up to 128KBytes of flash space. |
| |
| TRoth/2002-04-8: See comment above where AVR_IMEM_START is defined. */ |
| |
| static CORE_ADDR |
| avr_convert_iaddr_to_raw (CORE_ADDR x) |
| { |
| return ((x) & 0xffffffff); |
| } |
| |
| /* SRAM address checks and convertions. */ |
| |
| static CORE_ADDR |
| avr_make_saddr (CORE_ADDR x) |
| { |
| return ((x) | AVR_SMEM_START); |
| } |
| |
| static int |
| avr_saddr_p (CORE_ADDR x) |
| { |
| return (((x) & AVR_MEM_MASK) == AVR_SMEM_START); |
| } |
| |
| static CORE_ADDR |
| avr_convert_saddr_to_raw (CORE_ADDR x) |
| { |
| return ((x) & 0xffffffff); |
| } |
| |
| /* EEPROM address checks and convertions. I don't know if these will ever |
| actually be used, but I've added them just the same. TRoth */ |
| |
| /* TRoth/2002-04-08: Commented out for now to allow fix for problem with large |
| programs in the mega128. */ |
| |
| /* static CORE_ADDR */ |
| /* avr_make_eaddr (CORE_ADDR x) */ |
| /* { */ |
| /* return ((x) | AVR_EMEM_START); */ |
| /* } */ |
| |
| /* static int */ |
| /* avr_eaddr_p (CORE_ADDR x) */ |
| /* { */ |
| /* return (((x) & AVR_MEM_MASK) == AVR_EMEM_START); */ |
| /* } */ |
| |
| /* static CORE_ADDR */ |
| /* avr_convert_eaddr_to_raw (CORE_ADDR x) */ |
| /* { */ |
| /* return ((x) & 0xffffffff); */ |
| /* } */ |
| |
| /* Convert from address to pointer and vice-versa. */ |
| |
| static void |
| avr_address_to_pointer (struct type *type, void *buf, CORE_ADDR addr) |
| { |
| /* Is it a code address? */ |
| if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC |
| || TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD) |
| { |
| store_unsigned_integer (buf, TYPE_LENGTH (type), |
| avr_convert_iaddr_to_raw (addr)); |
| } |
| else |
| { |
| /* Strip off any upper segment bits. */ |
| store_unsigned_integer (buf, TYPE_LENGTH (type), |
| avr_convert_saddr_to_raw (addr)); |
| } |
| } |
| |
| static CORE_ADDR |
| avr_pointer_to_address (struct type *type, const void *buf) |
| { |
| CORE_ADDR addr = extract_address (buf, TYPE_LENGTH (type)); |
| |
| if (TYPE_CODE_SPACE (TYPE_TARGET_TYPE (type))) |
| { |
| fprintf_unfiltered (gdb_stderr, "CODE_SPACE ---->> ptr->addr: 0x%lx\n", |
| addr); |
| fprintf_unfiltered (gdb_stderr, |
| "+++ If you see this, please send me an email <troth@verinet.com>\n"); |
| } |
| |
| /* Is it a code address? */ |
| if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC |
| || TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD |
| || TYPE_CODE_SPACE (TYPE_TARGET_TYPE (type))) |
| return avr_make_iaddr (addr); |
| else |
| return avr_make_saddr (addr); |
| } |
| |
| static CORE_ADDR |
| avr_read_pc (ptid_t ptid) |
| { |
| ptid_t save_ptid; |
| CORE_ADDR pc; |
| CORE_ADDR retval; |
| |
| save_ptid = inferior_ptid; |
| inferior_ptid = ptid; |
| pc = (int) read_register (AVR_PC_REGNUM); |
| inferior_ptid = save_ptid; |
| retval = avr_make_iaddr (pc); |
| return retval; |
| } |
| |
| static void |
| avr_write_pc (CORE_ADDR val, ptid_t ptid) |
| { |
| ptid_t save_ptid; |
| |
| save_ptid = inferior_ptid; |
| inferior_ptid = ptid; |
| write_register (AVR_PC_REGNUM, avr_convert_iaddr_to_raw (val)); |
| inferior_ptid = save_ptid; |
| } |
| |
| static CORE_ADDR |
| avr_read_sp (void) |
| { |
| return (avr_make_saddr (read_register (AVR_SP_REGNUM))); |
| } |
| |
| static void |
| avr_write_sp (CORE_ADDR val) |
| { |
| write_register (AVR_SP_REGNUM, avr_convert_saddr_to_raw (val)); |
| } |
| |
| static CORE_ADDR |
| avr_read_fp (void) |
| { |
| return (avr_make_saddr (read_register (AVR_FP_REGNUM))); |
| } |
| |
| /* Translate a GDB virtual ADDR/LEN into a format the remote target |
| understands. Returns number of bytes that can be transfered |
| starting at TARG_ADDR. Return ZERO if no bytes can be transfered |
| (segmentation fault). |
| |
| TRoth/2002-04-08: Could this be used to check for dereferencing an invalid |
| pointer? */ |
| |
| static void |
| avr_remote_translate_xfer_address (CORE_ADDR memaddr, int nr_bytes, |
| CORE_ADDR *targ_addr, int *targ_len) |
| { |
| long out_addr; |
| long out_len; |
| |
| /* FIXME: TRoth: Do nothing for now. Will need to examine memaddr at this |
| point and see if the high bit are set with the masks that we want. */ |
| |
| *targ_addr = memaddr; |
| *targ_len = nr_bytes; |
| } |
| |
| /* Function pointers obtained from the target are half of what gdb expects so |
| multiply by 2. */ |
| |
| static CORE_ADDR |
| avr_convert_from_func_ptr_addr (CORE_ADDR addr) |
| { |
| return addr * 2; |
| } |
| |
| /* avr_scan_prologue is also used as the |
| deprecated_frame_init_saved_regs(). |
| |
| Put here the code to store, into fi->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. */ |
| |
| /* Function: avr_scan_prologue (helper function for avr_init_extra_frame_info) |
| This function decodes a AVR function prologue to determine: |
| 1) the size of the stack frame |
| 2) which registers are saved on it |
| 3) the offsets of saved regs |
| This information is stored in the "extra_info" field of the frame_info. |
| |
| A typical AVR function prologue might look like this: |
| push rXX |
| push r28 |
| push r29 |
| in r28,__SP_L__ |
| in r29,__SP_H__ |
| sbiw r28,<LOCALS_SIZE> |
| in __tmp_reg__,__SREG__ |
| cli |
| out __SP_L__,r28 |
| out __SREG__,__tmp_reg__ |
| out __SP_H__,r29 |
| |
| A `-mcall-prologues' prologue look like this: |
| ldi r26,<LOCALS_SIZE> |
| ldi r27,<LOCALS_SIZE>/265 |
| ldi r30,pm_lo8(.L_foo_body) |
| ldi r31,pm_hi8(.L_foo_body) |
| rjmp __prologue_saves__+RRR |
| .L_foo_body: */ |
| |
| static void |
| avr_scan_prologue (struct frame_info *fi) |
| { |
| CORE_ADDR prologue_start; |
| CORE_ADDR prologue_end; |
| int i; |
| unsigned short insn; |
| int regno; |
| int scan_stage = 0; |
| char *name; |
| struct minimal_symbol *msymbol; |
| int prologue_len; |
| unsigned char prologue[AVR_MAX_PROLOGUE_SIZE]; |
| int vpc = 0; |
| |
| get_frame_extra_info (fi)->framereg = AVR_SP_REGNUM; |
| |
| if (find_pc_partial_function |
| (get_frame_pc (fi), &name, &prologue_start, &prologue_end)) |
| { |
| struct symtab_and_line sal = find_pc_line (prologue_start, 0); |
| |
| if (sal.line == 0) /* no line info, use current PC */ |
| prologue_end = get_frame_pc (fi); |
| else if (sal.end < prologue_end) /* next line begins after fn end */ |
| prologue_end = sal.end; /* (probably means no prologue) */ |
| } |
| else |
| /* We're in the boondocks: allow for */ |
| /* 19 pushes, an add, and "mv fp,sp" */ |
| prologue_end = prologue_start + AVR_MAX_PROLOGUE_SIZE; |
| |
| prologue_end = min (prologue_end, get_frame_pc (fi)); |
| |
| /* Search the prologue looking for instructions that set up the |
| frame pointer, adjust the stack pointer, and save registers. */ |
| |
| get_frame_extra_info (fi)->framesize = 0; |
| prologue_len = prologue_end - prologue_start; |
| read_memory (prologue_start, prologue, prologue_len); |
| |
| /* Scanning main()'s prologue |
| ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>) |
| ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>) |
| out __SP_H__,r29 |
| out __SP_L__,r28 */ |
| |
| if (name && strcmp ("main", name) == 0 && prologue_len == 8) |
| { |
| CORE_ADDR locals; |
| unsigned char img[] = { |
| 0xde, 0xbf, /* out __SP_H__,r29 */ |
| 0xcd, 0xbf /* out __SP_L__,r28 */ |
| }; |
| |
| get_frame_extra_info (fi)->framereg = AVR_FP_REGNUM; |
| insn = EXTRACT_INSN (&prologue[vpc]); |
| /* ldi r28,lo8(<RAM_ADDR> - <LOCALS_SIZE>) */ |
| if ((insn & 0xf0f0) == 0xe0c0) |
| { |
| locals = (insn & 0xf) | ((insn & 0x0f00) >> 4); |
| insn = EXTRACT_INSN (&prologue[vpc + 2]); |
| /* ldi r29,hi8(<RAM_ADDR> - <LOCALS_SIZE>) */ |
| if ((insn & 0xf0f0) == 0xe0d0) |
| { |
| locals |= ((insn & 0xf) | ((insn & 0x0f00) >> 4)) << 8; |
| if (memcmp (prologue + vpc + 4, img, sizeof (img)) == 0) |
| { |
| deprecated_update_frame_base_hack (fi, locals); |
| |
| get_frame_extra_info (fi)->is_main = 1; |
| return; |
| } |
| } |
| } |
| } |
| |
| /* Scanning `-mcall-prologues' prologue |
| FIXME: mega prologue have a 12 bytes long */ |
| |
| while (prologue_len <= 12) /* I'm use while to avoit many goto's */ |
| { |
| int loc_size; |
| int body_addr; |
| unsigned num_pushes; |
| |
| insn = EXTRACT_INSN (&prologue[vpc]); |
| /* ldi r26,<LOCALS_SIZE> */ |
| if ((insn & 0xf0f0) != 0xe0a0) |
| break; |
| loc_size = (insn & 0xf) | ((insn & 0x0f00) >> 4); |
| |
| insn = EXTRACT_INSN (&prologue[vpc + 2]); |
| /* ldi r27,<LOCALS_SIZE> / 256 */ |
| if ((insn & 0xf0f0) != 0xe0b0) |
| break; |
| loc_size |= ((insn & 0xf) | ((insn & 0x0f00) >> 4)) << 8; |
| |
| insn = EXTRACT_INSN (&prologue[vpc + 4]); |
| /* ldi r30,pm_lo8(.L_foo_body) */ |
| if ((insn & 0xf0f0) != 0xe0e0) |
| break; |
| body_addr = (insn & 0xf) | ((insn & 0x0f00) >> 4); |
| |
| insn = EXTRACT_INSN (&prologue[vpc + 6]); |
| /* ldi r31,pm_hi8(.L_foo_body) */ |
| if ((insn & 0xf0f0) != 0xe0f0) |
| break; |
| body_addr |= ((insn & 0xf) | ((insn & 0x0f00) >> 4)) << 8; |
| |
| if (body_addr != (prologue_start + 10) / 2) |
| break; |
| |
| msymbol = lookup_minimal_symbol ("__prologue_saves__", NULL, NULL); |
| if (!msymbol) |
| break; |
| |
| /* FIXME: prologue for mega have a JMP instead of RJMP */ |
| insn = EXTRACT_INSN (&prologue[vpc + 8]); |
| /* rjmp __prologue_saves__+RRR */ |
| if ((insn & 0xf000) != 0xc000) |
| break; |
| |
| /* Extract PC relative offset from RJMP */ |
| i = (insn & 0xfff) | (insn & 0x800 ? (-1 ^ 0xfff) : 0); |
| /* Convert offset to byte addressable mode */ |
| i *= 2; |
| /* Destination address */ |
| i += vpc + prologue_start + 10; |
| /* Resovle offset (in words) from __prologue_saves__ symbol. |
| Which is a pushes count in `-mcall-prologues' mode */ |
| num_pushes = AVR_MAX_PUSHES - (i - SYMBOL_VALUE_ADDRESS (msymbol)) / 2; |
| |
| if (num_pushes > AVR_MAX_PUSHES) |
| num_pushes = 0; |
| |
| if (num_pushes) |
| { |
| int from; |
| get_frame_saved_regs (fi)[AVR_FP_REGNUM + 1] = num_pushes; |
| if (num_pushes >= 2) |
| get_frame_saved_regs (fi)[AVR_FP_REGNUM] = num_pushes - 1; |
| i = 0; |
| for (from = AVR_LAST_PUSHED_REGNUM + 1 - (num_pushes - 2); |
| from <= AVR_LAST_PUSHED_REGNUM; ++from) |
| get_frame_saved_regs (fi)[from] = ++i; |
| } |
| get_frame_extra_info (fi)->locals_size = loc_size; |
| get_frame_extra_info (fi)->framesize = loc_size + num_pushes; |
| get_frame_extra_info (fi)->framereg = AVR_FP_REGNUM; |
| return; |
| } |
| |
| /* Scan interrupt or signal function */ |
| |
| if (prologue_len >= 12) |
| { |
| unsigned char img[] = { |
| 0x78, 0x94, /* sei */ |
| 0x1f, 0x92, /* push r1 */ |
| 0x0f, 0x92, /* push r0 */ |
| 0x0f, 0xb6, /* in r0,0x3f SREG */ |
| 0x0f, 0x92, /* push r0 */ |
| 0x11, 0x24 /* clr r1 */ |
| }; |
| if (memcmp (prologue, img, sizeof (img)) == 0) |
| { |
| vpc += sizeof (img); |
| get_frame_saved_regs (fi)[0] = 2; |
| get_frame_saved_regs (fi)[1] = 1; |
| get_frame_extra_info (fi)->framesize += 3; |
| } |
| else if (memcmp (img + 1, prologue, sizeof (img) - 1) == 0) |
| { |
| vpc += sizeof (img) - 1; |
| get_frame_saved_regs (fi)[0] = 2; |
| get_frame_saved_regs (fi)[1] = 1; |
| get_frame_extra_info (fi)->framesize += 3; |
| } |
| } |
| |
| /* First stage of the prologue scanning. |
| Scan pushes */ |
| |
| for (; vpc <= prologue_len; vpc += 2) |
| { |
| insn = EXTRACT_INSN (&prologue[vpc]); |
| if ((insn & 0xfe0f) == 0x920f) /* push rXX */ |
| { |
| /* Bits 4-9 contain a mask for registers R0-R32. */ |
| regno = (insn & 0x1f0) >> 4; |
| ++get_frame_extra_info (fi)->framesize; |
| get_frame_saved_regs (fi)[regno] = get_frame_extra_info (fi)->framesize; |
| scan_stage = 1; |
| } |
| else |
| break; |
| } |
| |
| /* Second stage of the prologue scanning. |
| Scan: |
| in r28,__SP_L__ |
| in r29,__SP_H__ */ |
| |
| if (scan_stage == 1 && vpc + 4 <= prologue_len) |
| { |
| unsigned char img[] = { |
| 0xcd, 0xb7, /* in r28,__SP_L__ */ |
| 0xde, 0xb7 /* in r29,__SP_H__ */ |
| }; |
| unsigned short insn1; |
| |
| if (memcmp (prologue + vpc, img, sizeof (img)) == 0) |
| { |
| vpc += 4; |
| get_frame_extra_info (fi)->framereg = AVR_FP_REGNUM; |
| scan_stage = 2; |
| } |
| } |
| |
| /* Third stage of the prologue scanning. (Really two stages) |
| Scan for: |
| sbiw r28,XX or subi r28,lo8(XX) |
| sbci r29,hi8(XX) |
| in __tmp_reg__,__SREG__ |
| cli |
| out __SP_L__,r28 |
| out __SREG__,__tmp_reg__ |
| out __SP_H__,r29 */ |
| |
| if (scan_stage == 2 && vpc + 12 <= prologue_len) |
| { |
| int locals_size = 0; |
| unsigned char img[] = { |
| 0x0f, 0xb6, /* in r0,0x3f */ |
| 0xf8, 0x94, /* cli */ |
| 0xcd, 0xbf, /* out 0x3d,r28 ; SPL */ |
| 0x0f, 0xbe, /* out 0x3f,r0 ; SREG */ |
| 0xde, 0xbf /* out 0x3e,r29 ; SPH */ |
| }; |
| unsigned char img_sig[] = { |
| 0xcd, 0xbf, /* out 0x3d,r28 ; SPL */ |
| 0xde, 0xbf /* out 0x3e,r29 ; SPH */ |
| }; |
| unsigned char img_int[] = { |
| 0xf8, 0x94, /* cli */ |
| 0xcd, 0xbf, /* out 0x3d,r28 ; SPL */ |
| 0x78, 0x94, /* sei */ |
| 0xde, 0xbf /* out 0x3e,r29 ; SPH */ |
| }; |
| |
| insn = EXTRACT_INSN (&prologue[vpc]); |
| vpc += 2; |
| if ((insn & 0xff30) == 0x9720) /* sbiw r28,XXX */ |
| locals_size = (insn & 0xf) | ((insn & 0xc0) >> 2); |
| else if ((insn & 0xf0f0) == 0x50c0) /* subi r28,lo8(XX) */ |
| { |
| locals_size = (insn & 0xf) | ((insn & 0xf00) >> 4); |
| insn = EXTRACT_INSN (&prologue[vpc]); |
| vpc += 2; |
| locals_size += ((insn & 0xf) | ((insn & 0xf00) >> 4) << 8); |
| } |
| else |
| return; |
| get_frame_extra_info (fi)->locals_size = locals_size; |
| get_frame_extra_info (fi)->framesize += locals_size; |
| } |
| } |
| |
| /* This function actually figures out the frame address for a given pc and |
| sp. This is tricky because we sometimes don't use an explicit |
| frame pointer, and the previous stack pointer isn't necessarily recorded |
| on the stack. The only reliable way to get this info is to |
| examine the prologue. */ |
| |
| static void |
| avr_init_extra_frame_info (int fromleaf, struct frame_info *fi) |
| { |
| int reg; |
| |
| if (get_next_frame (fi)) |
| deprecated_update_frame_pc_hack (fi, DEPRECATED_FRAME_SAVED_PC (get_next_frame (fi))); |
| |
| frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info)); |
| frame_saved_regs_zalloc (fi); |
| |
| get_frame_extra_info (fi)->return_pc = 0; |
| get_frame_extra_info (fi)->args_pointer = 0; |
| get_frame_extra_info (fi)->locals_size = 0; |
| get_frame_extra_info (fi)->framereg = 0; |
| get_frame_extra_info (fi)->framesize = 0; |
| get_frame_extra_info (fi)->is_main = 0; |
| |
| avr_scan_prologue (fi); |
| |
| if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), get_frame_base (fi), |
| get_frame_base (fi))) |
| { |
| /* We need to setup fi->frame here because run_stack_dummy gets it wrong |
| by assuming it's always FP. */ |
| deprecated_update_frame_base_hack (fi, deprecated_read_register_dummy (get_frame_pc (fi), get_frame_base (fi), |
| AVR_PC_REGNUM)); |
| } |
| else if (!get_next_frame (fi)) |
| /* this is the innermost frame? */ |
| deprecated_update_frame_base_hack (fi, read_register (get_frame_extra_info (fi)->framereg)); |
| else if (get_frame_extra_info (fi)->is_main != 1) |
| /* not the innermost frame, not `main' */ |
| /* If we have an next frame, the callee saved it. */ |
| { |
| struct frame_info *next_fi = get_next_frame (fi); |
| if (get_frame_extra_info (fi)->framereg == AVR_SP_REGNUM) |
| deprecated_update_frame_base_hack (fi, (get_frame_base (next_fi) |
| + 2 /* ret addr */ |
| + get_frame_extra_info (next_fi)->framesize)); |
| /* FIXME: I don't analyse va_args functions */ |
| else |
| { |
| CORE_ADDR fp = 0; |
| CORE_ADDR fp1 = 0; |
| unsigned int fp_low, fp_high; |
| |
| /* Scan all frames */ |
| for (; next_fi; next_fi = get_next_frame (next_fi)) |
| { |
| /* look for saved AVR_FP_REGNUM */ |
| if (get_frame_saved_regs (next_fi)[AVR_FP_REGNUM] && !fp) |
| fp = get_frame_saved_regs (next_fi)[AVR_FP_REGNUM]; |
| /* look for saved AVR_FP_REGNUM + 1 */ |
| if (get_frame_saved_regs (next_fi)[AVR_FP_REGNUM + 1] && !fp1) |
| fp1 = get_frame_saved_regs (next_fi)[AVR_FP_REGNUM + 1]; |
| } |
| fp_low = (fp ? read_memory_unsigned_integer (avr_make_saddr (fp), 1) |
| : read_register (AVR_FP_REGNUM)) & 0xff; |
| fp_high = |
| (fp1 ? read_memory_unsigned_integer (avr_make_saddr (fp1), 1) : |
| read_register (AVR_FP_REGNUM + 1)) & 0xff; |
| deprecated_update_frame_base_hack (fi, fp_low | (fp_high << 8)); |
| } |
| } |
| |
| /* TRoth: Do we want to do this if we are in main? I don't think we should |
| since return_pc makes no sense when we are in main. */ |
| |
| if ((get_frame_pc (fi)) && (get_frame_extra_info (fi)->is_main == 0)) |
| /* We are not in CALL_DUMMY */ |
| { |
| CORE_ADDR addr; |
| int i; |
| |
| addr = get_frame_base (fi) + get_frame_extra_info (fi)->framesize + 1; |
| |
| /* Return address in stack in different endianness */ |
| |
| get_frame_extra_info (fi)->return_pc = |
| read_memory_unsigned_integer (avr_make_saddr (addr), 1) << 8; |
| get_frame_extra_info (fi)->return_pc |= |
| read_memory_unsigned_integer (avr_make_saddr (addr + 1), 1); |
| |
| /* This return address in words, |
| must be converted to the bytes address */ |
| get_frame_extra_info (fi)->return_pc *= 2; |
| |
| /* Resolve a pushed registers addresses */ |
| for (i = 0; i < NUM_REGS; i++) |
| { |
| if (get_frame_saved_regs (fi)[i]) |
| get_frame_saved_regs (fi)[i] = addr - get_frame_saved_regs (fi)[i]; |
| } |
| } |
| } |
| |
| /* Restore the machine to the state it had before the current frame was |
| created. Usually used either by the "RETURN" command, or by |
| call_function_by_hand after the dummy_frame is finished. */ |
| |
| static void |
| avr_pop_frame (void) |
| { |
| unsigned regnum; |
| CORE_ADDR saddr; |
| struct frame_info *frame = get_current_frame (); |
| |
| if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (frame), |
| get_frame_base (frame), |
| get_frame_base (frame))) |
| { |
| generic_pop_dummy_frame (); |
| } |
| else |
| { |
| /* TRoth: Why only loop over 8 registers? */ |
| |
| for (regnum = 0; regnum < 8; regnum++) |
| { |
| /* Don't forget AVR_SP_REGNUM in a frame_saved_regs struct is the |
| actual value we want, not the address of the value we want. */ |
| if (get_frame_saved_regs (frame)[regnum] && regnum != AVR_SP_REGNUM) |
| { |
| saddr = avr_make_saddr (get_frame_saved_regs (frame)[regnum]); |
| write_register (regnum, |
| read_memory_unsigned_integer (saddr, 1)); |
| } |
| else if (get_frame_saved_regs (frame)[regnum] && regnum == AVR_SP_REGNUM) |
| write_register (regnum, get_frame_base (frame) + 2); |
| } |
| |
| /* Don't forget the update the PC too! */ |
| write_pc (get_frame_extra_info (frame)->return_pc); |
| } |
| flush_cached_frames (); |
| } |
| |
| /* Return the saved PC from this frame. */ |
| |
| static CORE_ADDR |
| avr_frame_saved_pc (struct frame_info *frame) |
| { |
| if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (frame), |
| get_frame_base (frame), |
| get_frame_base (frame))) |
| return deprecated_read_register_dummy (get_frame_pc (frame), |
| get_frame_base (frame), |
| AVR_PC_REGNUM); |
| else |
| return get_frame_extra_info (frame)->return_pc; |
| } |
| |
| static CORE_ADDR |
| avr_saved_pc_after_call (struct frame_info *frame) |
| { |
| unsigned char m1, m2; |
| unsigned int sp = read_register (AVR_SP_REGNUM); |
| m1 = read_memory_unsigned_integer (avr_make_saddr (sp + 1), 1); |
| m2 = read_memory_unsigned_integer (avr_make_saddr (sp + 2), 1); |
| return (m2 | (m1 << 8)) * 2; |
| } |
| |
| /* Returns the return address for a dummy. */ |
| |
| static CORE_ADDR |
| avr_call_dummy_address (void) |
| { |
| return entry_point_address (); |
| } |
| |
| /* Setup the return address for a dummy frame, as called by |
| call_function_by_hand. Only necessary when you are using an empty |
| CALL_DUMMY. */ |
| |
| static CORE_ADDR |
| avr_push_return_address (CORE_ADDR pc, CORE_ADDR sp) |
| { |
| unsigned char buf[2]; |
| int wordsize = 2; |
| #if 0 |
| struct minimal_symbol *msymbol; |
| CORE_ADDR mon_brk; |
| #endif |
| |
| buf[0] = 0; |
| buf[1] = 0; |
| sp -= wordsize; |
| write_memory (sp + 1, buf, 2); |
| |
| #if 0 |
| /* FIXME: TRoth/2002-02-18: This should probably be removed since it's a |
| left-over from Denis' original patch which used avr-mon for the target |
| instead of the generic remote target. */ |
| if ((strcmp (target_shortname, "avr-mon") == 0) |
| && (msymbol = lookup_minimal_symbol ("gdb_break", NULL, NULL))) |
| { |
| mon_brk = SYMBOL_VALUE_ADDRESS (msymbol); |
| store_unsigned_integer (buf, wordsize, mon_brk / 2); |
| sp -= wordsize; |
| write_memory (sp + 1, buf + 1, 1); |
| write_memory (sp + 2, buf, 1); |
| } |
| #endif |
| return sp; |
| } |
| |
| static CORE_ADDR |
| avr_skip_prologue (CORE_ADDR pc) |
| { |
| CORE_ADDR func_addr, func_end; |
| struct symtab_and_line sal; |
| |
| /* See what the symbol table says */ |
| |
| if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) |
| { |
| sal = find_pc_line (func_addr, 0); |
| |
| /* troth/2002-08-05: For some very simple functions, gcc doesn't |
| generate a prologue and the sal.end ends up being the 2-byte ``ret'' |
| instruction at the end of the function, but func_end ends up being |
| the address of the first instruction of the _next_ function. By |
| adjusting func_end by 2 bytes, we can catch these functions and not |
| return sal.end if it is the ``ret'' instruction. */ |
| |
| if (sal.line != 0 && sal.end < (func_end-2)) |
| return sal.end; |
| } |
| |
| /* Either we didn't find the start of this function (nothing we can do), |
| or there's no line info, or the line after the prologue is after |
| the end of the function (there probably isn't a prologue). */ |
| |
| return pc; |
| } |
| |
| static CORE_ADDR |
| avr_frame_address (struct frame_info *fi) |
| { |
| return avr_make_saddr (get_frame_base (fi)); |
| } |
| |
| /* Given a GDB frame, determine the address of the calling function's |
| frame. This will be used to create a new GDB frame struct, and |
| then DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC |
| will be called for the new frame. |
| |
| For us, the frame address is its stack pointer value, so we look up |
| the function prologue to determine the caller's sp value, and return it. */ |
| |
| static CORE_ADDR |
| avr_frame_chain (struct frame_info *frame) |
| { |
| if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (frame), |
| get_frame_base (frame), |
| get_frame_base (frame))) |
| { |
| /* initialize the return_pc now */ |
| get_frame_extra_info (frame)->return_pc |
| = deprecated_read_register_dummy (get_frame_pc (frame), |
| get_frame_base (frame), |
| AVR_PC_REGNUM); |
| return get_frame_base (frame); |
| } |
| return (get_frame_extra_info (frame)->is_main ? 0 |
| : get_frame_base (frame) + get_frame_extra_info (frame)->framesize + 2 /* ret addr */ ); |
| } |
| |
| /* Store the address of the place in which to copy the structure the |
| subroutine will return. This is called from call_function. |
| |
| We store structs through a pointer passed in the first Argument |
| register. */ |
| |
| static void |
| avr_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
| { |
| write_register (0, addr); |
| } |
| |
| /* Setup the function arguments for calling a function in the inferior. |
| |
| On the AVR architecture, there are 18 registers (R25 to R8) which are |
| dedicated for passing function arguments. Up to the first 18 arguments |
| (depending on size) may go into these registers. The rest go on the stack. |
| |
| Arguments that are larger than WORDSIZE bytes will be split between two or |
| more registers as available, but will NOT be split between a register and |
| the stack. |
| |
| An exceptional case exists for struct arguments (and possibly other |
| aggregates such as arrays) -- if the size is larger than WORDSIZE bytes but |
| not a multiple of WORDSIZE bytes. In this case the argument is never split |
| between the registers and the stack, but instead is copied in its entirety |
| onto the stack, AND also copied into as many registers as there is room |
| for. In other words, space in registers permitting, two copies of the same |
| argument are passed in. As far as I can tell, only the one on the stack is |
| used, although that may be a function of the level of compiler |
| optimization. I suspect this is a compiler bug. Arguments of these odd |
| sizes are left-justified within the word (as opposed to arguments smaller |
| than WORDSIZE bytes, which are right-justified). |
| |
| If the function is to return an aggregate type such as a struct, the caller |
| must allocate space into which the callee will copy the return value. In |
| this case, a pointer to the return value location is passed into the callee |
| in register R0, which displaces one of the other arguments passed in via |
| registers R0 to R2. */ |
| |
| static CORE_ADDR |
| avr_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
| int struct_return, CORE_ADDR struct_addr) |
| { |
| int stack_alloc, stack_offset; |
| int wordsize; |
| int argreg; |
| int argnum; |
| struct type *type; |
| CORE_ADDR regval; |
| char *val; |
| char valbuf[4]; |
| int len; |
| |
| wordsize = 1; |
| #if 0 |
| /* Now make sure there's space on the stack */ |
| for (argnum = 0, stack_alloc = 0; argnum < nargs; argnum++) |
| stack_alloc += TYPE_LENGTH (VALUE_TYPE (args[argnum])); |
| sp -= stack_alloc; /* make room on stack for args */ |
| /* we may over-allocate a little here, but that won't hurt anything */ |
| #endif |
| argreg = 25; |
| if (struct_return) /* "struct return" pointer takes up one argreg */ |
| { |
| write_register (--argreg, struct_addr); |
| } |
| |
| /* Now load as many as possible of the first arguments into registers, and |
| push the rest onto the stack. There are 3N bytes in three registers |
| available. Loop thru args from first to last. */ |
| |
| for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++) |
| { |
| type = VALUE_TYPE (args[argnum]); |
| len = TYPE_LENGTH (type); |
| val = (char *) VALUE_CONTENTS (args[argnum]); |
| |
| /* NOTE WELL!!!!! This is not an "else if" clause!!! That's because |
| some *&^%$ things get passed on the stack AND in the registers! */ |
| while (len > 0) |
| { /* there's room in registers */ |
| len -= wordsize; |
| regval = extract_address (val + len, wordsize); |
| write_register (argreg--, regval); |
| } |
| } |
| return sp; |
| } |
| |
| /* Initialize the gdbarch structure for the AVR's. */ |
| |
| static struct gdbarch * |
| avr_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| { |
| /* FIXME: TRoth/2002-02-18: I have no idea if avr_call_dummy_words[] should |
| be bigger or not. Initial testing seems to show that `call my_func()` |
| works and backtrace from a breakpoint within the call looks correct. |
| Admittedly, I haven't tested with more than a very simple program. */ |
| static LONGEST avr_call_dummy_words[] = { 0 }; |
| |
| struct gdbarch *gdbarch; |
| struct gdbarch_tdep *tdep; |
| |
| /* Find a candidate among the list of pre-declared architectures. */ |
| arches = gdbarch_list_lookup_by_info (arches, &info); |
| if (arches != NULL) |
| return arches->gdbarch; |
| |
| /* None found, create a new architecture from the information provided. */ |
| tdep = XMALLOC (struct gdbarch_tdep); |
| gdbarch = gdbarch_alloc (&info, tdep); |
| |
| /* NOTE: cagney/2002-12-06: This can be deleted when this arch is |
| ready to unwind the PC first (see frame.c:get_prev_frame()). */ |
| set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_default); |
| |
| /* If we ever need to differentiate the device types, do it here. */ |
| switch (info.bfd_arch_info->mach) |
| { |
| case bfd_mach_avr1: |
| case bfd_mach_avr2: |
| case bfd_mach_avr3: |
| case bfd_mach_avr4: |
| case bfd_mach_avr5: |
| break; |
| } |
| |
| set_gdbarch_short_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| set_gdbarch_int_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| set_gdbarch_long_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| set_gdbarch_long_long_bit (gdbarch, 8 * TARGET_CHAR_BIT); |
| set_gdbarch_ptr_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
| set_gdbarch_addr_bit (gdbarch, 32); |
| set_gdbarch_bfd_vma_bit (gdbarch, 32); /* FIXME: TRoth/2002-02-18: Is this needed? */ |
| |
| set_gdbarch_float_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| set_gdbarch_double_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| set_gdbarch_long_double_bit (gdbarch, 4 * TARGET_CHAR_BIT); |
| |
| set_gdbarch_float_format (gdbarch, &floatformat_ieee_single_little); |
| set_gdbarch_double_format (gdbarch, &floatformat_ieee_single_little); |
| set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_single_little); |
| |
| set_gdbarch_read_pc (gdbarch, avr_read_pc); |
| set_gdbarch_write_pc (gdbarch, avr_write_pc); |
| set_gdbarch_read_fp (gdbarch, avr_read_fp); |
| set_gdbarch_read_sp (gdbarch, avr_read_sp); |
| set_gdbarch_deprecated_dummy_write_sp (gdbarch, avr_write_sp); |
| |
| set_gdbarch_num_regs (gdbarch, AVR_NUM_REGS); |
| |
| set_gdbarch_sp_regnum (gdbarch, AVR_SP_REGNUM); |
| set_gdbarch_fp_regnum (gdbarch, AVR_FP_REGNUM); |
| set_gdbarch_pc_regnum (gdbarch, AVR_PC_REGNUM); |
| |
| set_gdbarch_register_name (gdbarch, avr_register_name); |
| set_gdbarch_register_size (gdbarch, 1); |
| set_gdbarch_register_bytes (gdbarch, AVR_NUM_REG_BYTES); |
| set_gdbarch_register_byte (gdbarch, avr_register_byte); |
| set_gdbarch_register_raw_size (gdbarch, avr_register_raw_size); |
| set_gdbarch_deprecated_max_register_raw_size (gdbarch, 4); |
| set_gdbarch_register_virtual_size (gdbarch, avr_register_virtual_size); |
| set_gdbarch_deprecated_max_register_virtual_size (gdbarch, 4); |
| set_gdbarch_register_virtual_type (gdbarch, avr_register_virtual_type); |
| |
| set_gdbarch_print_insn (gdbarch, print_insn_avr); |
| |
| set_gdbarch_call_dummy_address (gdbarch, avr_call_dummy_address); |
| set_gdbarch_call_dummy_start_offset (gdbarch, 0); |
| set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1); |
| set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0); |
| set_gdbarch_call_dummy_length (gdbarch, 0); |
| set_gdbarch_call_dummy_p (gdbarch, 1); |
| set_gdbarch_call_dummy_words (gdbarch, avr_call_dummy_words); |
| set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy); |
| |
| /* set_gdbarch_believe_pcc_promotion (gdbarch, 1); // TRoth: should this be set? */ |
| |
| set_gdbarch_address_to_pointer (gdbarch, avr_address_to_pointer); |
| set_gdbarch_pointer_to_address (gdbarch, avr_pointer_to_address); |
| set_gdbarch_deprecated_push_arguments (gdbarch, avr_push_arguments); |
| set_gdbarch_deprecated_push_return_address (gdbarch, avr_push_return_address); |
| set_gdbarch_deprecated_pop_frame (gdbarch, avr_pop_frame); |
| |
| set_gdbarch_use_struct_convention (gdbarch, generic_use_struct_convention); |
| set_gdbarch_deprecated_store_struct_return (gdbarch, avr_store_struct_return); |
| |
| set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, avr_scan_prologue); |
| set_gdbarch_deprecated_init_extra_frame_info (gdbarch, avr_init_extra_frame_info); |
| set_gdbarch_skip_prologue (gdbarch, avr_skip_prologue); |
| set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| |
| set_gdbarch_decr_pc_after_break (gdbarch, 0); |
| |
| set_gdbarch_function_start_offset (gdbarch, 0); |
| set_gdbarch_remote_translate_xfer_address (gdbarch, |
| avr_remote_translate_xfer_address); |
| set_gdbarch_frame_args_skip (gdbarch, 0); |
| set_gdbarch_frameless_function_invocation (gdbarch, frameless_look_for_prologue); /* ??? */ |
| set_gdbarch_deprecated_frame_chain (gdbarch, avr_frame_chain); |
| set_gdbarch_deprecated_frame_saved_pc (gdbarch, avr_frame_saved_pc); |
| set_gdbarch_frame_args_address (gdbarch, avr_frame_address); |
| set_gdbarch_frame_locals_address (gdbarch, avr_frame_address); |
| set_gdbarch_saved_pc_after_call (gdbarch, avr_saved_pc_after_call); |
| set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown); |
| |
| set_gdbarch_convert_from_func_ptr_addr (gdbarch, |
| avr_convert_from_func_ptr_addr); |
| |
| return gdbarch; |
| } |
| |
| /* Send a query request to the avr remote target asking for values of the io |
| registers. If args parameter is not NULL, then the user has requested info |
| on a specific io register [This still needs implemented and is ignored for |
| now]. The query string should be one of these forms: |
| |
| "Ravr.io_reg" -> reply is "NN" number of io registers |
| |
| "Ravr.io_reg:addr,len" where addr is first register and len is number of |
| registers to be read. The reply should be "<NAME>,VV;" for each io register |
| where, <NAME> is a string, and VV is the hex value of the register. |
| |
| All io registers are 8-bit. */ |
| |
| static void |
| avr_io_reg_read_command (char *args, int from_tty) |
| { |
| int bufsiz = 0; |
| char buf[400]; |
| char query[400]; |
| char *p; |
| unsigned int nreg = 0; |
| unsigned int val; |
| int i, j, k, step; |
| |
| /* fprintf_unfiltered (gdb_stderr, "DEBUG: avr_io_reg_read_command (\"%s\", %d)\n", */ |
| /* args, from_tty); */ |
| |
| if (!current_target.to_query) |
| { |
| fprintf_unfiltered (gdb_stderr, |
| "ERR: info io_registers NOT supported by current target\n"); |
| return; |
| } |
| |
| /* Just get the maximum buffer size. */ |
| target_query ((int) 'R', 0, 0, &bufsiz); |
| if (bufsiz > sizeof (buf)) |
| bufsiz = sizeof (buf); |
| |
| /* Find out how many io registers the target has. */ |
| strcpy (query, "avr.io_reg"); |
| target_query ((int) 'R', query, buf, &bufsiz); |
| |
| if (strncmp (buf, "", bufsiz) == 0) |
| { |
| fprintf_unfiltered (gdb_stderr, |
| "info io_registers NOT supported by target\n"); |
| return; |
| } |
| |
| if (sscanf (buf, "%x", &nreg) != 1) |
| { |
| fprintf_unfiltered (gdb_stderr, |
| "Error fetching number of io registers\n"); |
| return; |
| } |
| |
| reinitialize_more_filter (); |
| |
| printf_unfiltered ("Target has %u io registers:\n\n", nreg); |
| |
| /* only fetch up to 8 registers at a time to keep the buffer small */ |
| step = 8; |
| |
| for (i = 0; i < nreg; i += step) |
| { |
| /* how many registers this round? */ |
| j = step; |
| if ((i+j) >= nreg) |
| j = nreg - i; /* last block is less than 8 registers */ |
| |
| snprintf (query, sizeof (query) - 1, "avr.io_reg:%x,%x", i, j); |
| target_query ((int) 'R', query, buf, &bufsiz); |
| |
| p = buf; |
| for (k = i; k < (i + j); k++) |
| { |
| if (sscanf (p, "%[^,],%x;", query, &val) == 2) |
| { |
| printf_filtered ("[%02x] %-15s : %02x\n", k, query, val); |
| while ((*p != ';') && (*p != '\0')) |
| p++; |
| p++; /* skip over ';' */ |
| if (*p == '\0') |
| break; |
| } |
| } |
| } |
| } |
| |
| void |
| _initialize_avr_tdep (void) |
| { |
| register_gdbarch_init (bfd_arch_avr, avr_gdbarch_init); |
| |
| /* Add a new command to allow the user to query the avr remote target for |
| the values of the io space registers in a saner way than just using |
| `x/NNNb ADDR`. */ |
| |
| /* FIXME: TRoth/2002-02-18: This should probably be changed to 'info avr |
| io_registers' to signify it is not available on other platforms. */ |
| |
| add_cmd ("io_registers", class_info, avr_io_reg_read_command, |
| "query remote avr target for io space register values", &infolist); |
| } |