URL
https://opencores.org/ocsvn/openrisc_me/openrisc_me/trunk
Subversion Repositories openrisc_me
[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [remote-or1k.c] - Rev 280
Go to most recent revision | Compare with Previous | Blame | View Log
/* Remote debugging interface for various or1k debugging protocols. Currently supported or1k targets are: simulator, jtag, dummy. Copyright 1993-1995, 2000 Free Software Foundation, Inc. Copyright 2008 Embecosm Limited Contributed by Cygnus Support. Written by Marko Mlinar <markom@opencores.org> Contributor Jeremy Bennett <jeremy.bennett@embecosm.com> 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 3 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, see <http://www.gnu.org/licenses/>. */ /*--------------------------------------------------------------------------*/ /*!Updated for GDB 6.8 by Jeremy Bennett. All code converted to ANSI C style and in general to GDB format. All global OpenRISC specific functions and variables should now have a prefix of or1k_ or OR1K_. This original code defined three possible remote targets "jtag", "sim" and "dummy", all using the OpenRISC 1000 remote protocol. However only "jtag" is actually implemented, and in this version, all the redundant code is stripped out. The intention is that in time all remote debugging will be via the Remote Serial Protocol. Commenting compatible with Doxygen added throughout. */ /*---------------------------------------------------------------------------*/ #include "defs.h" #include "inferior.h" #include "bfd.h" #include "symfile.h" #include "gdb_wait.h" #include "gdbcmd.h" #include "gdbcore.h" #include "target.h" #include "gdb_string.h" #include "event-loop.h" #include "event-top.h" #include "inf-loop.h" #include "regcache.h" #include <signal.h> #include <sys/types.h> #include <sys/stat.h> #include <sys/ioctl.h> #include <fcntl.h> #include "or1k-tdep.h" #include "or1k-jtag.h" #include "exceptions.h" #include "frame.h" #include "opcode/or32.h" #include "solib.h" #include <arpa/inet.h> /*! The current OR1K target */ static struct target_ops or1k_target; /*! Are we single stepping */ static int or1k_is_single_stepping; /*! Cached OR1K debug register values (ignores counters for now). */ static struct { unsigned long int dvr[OR1K_MAX_MATCHPOINTS]; struct { enum { OR1K_CT_DISABLED = 0, /* Disabled */ OR1K_CT_FETCH = 1, /* Compare to fetch EA */ OR1K_CT_LEA = 2, /* Compare to load EA */ OR1K_CT_SEA = 3, /* Compare to store EA */ OR1K_CT_LDATA = 4, /* Compare to load data */ OR1K_CT_SDATA = 5, /* Compare to store data */ OR1K_CT_AEA = 6, /* Compare to load/store EA */ OR1K_CT_ADATA = 7 /* Compare to load/store data */ } ct; /* Compare to what? */ int sc; /* Signed comparision */ enum { OR1K_CC_MASKED = 0, OR1K_CC_EQ = 1, OR1K_CC_LT = 2, OR1K_CC_LE = 3, OR1K_CC_GT = 4, OR1K_CC_GE = 5, OR1K_CC_NE = 6, OR1K_CC_RESERVED = 7 } cc; /* Compare operation */ int dp; /* DVR/DCP present */ } dcr[OR1K_MAX_MATCHPOINTS]; unsigned long int dmr1; unsigned long int dmr2; unsigned long int dsr; unsigned long int drr; } or1k_dbgcache; /*! Old SIGINT handler. */ static void (*or1k_old_intr_handler) (int) = NULL; /* Forward declaration of global functions to access SPRs. */ ULONGEST or1k_read_spr (unsigned int regnum); void or1k_write_spr (unsigned int regnum, ULONGEST data); /* Forward declaration of support functions to handle user interrupt */ static void or1k_interrupt_query(); static void or1k_interrupt (int signo); static void or1k_interrupt_twice (int signo); /* Forward declaration of support functions to handle breakpoints */ static unsigned char or1k_gdb_to_dcr_type (enum target_hw_bp_type gdb_type); static int or1k_set_breakpoint (CORE_ADDR addr); static int or1k_clear_breakpoint (CORE_ADDR addr); static int or1k_watchpoint_gc (); static int or1k_stopped_watchpoint_info (CORE_ADDR *addr_p, int *mp_p); /* Forward declarations of support functions for the remote operations */ static int or1k_regnum_to_sprnum (int regnum); static void or1k_commit_debug_registers(); static void or1k_start_remote (struct ui_out *uiout, void *arg); /* Forward declarations of functions for the remote operations */ static void or1k_files_info (struct target_ops *target); static void or1k_open (char *name, int from_tty); static void or1k_close (int quitting); static void or1k_detach (char *args, int from_tty); static void or1k_fetch_registers (struct regcache *regcache, int regnum); static void or1k_store_registers (struct regcache *regcache, int regnum); static void or1k_prepare_to_store (struct regcache *regcache); static LONGEST or1k_xfer_partial (struct target_ops *ops, enum target_object object, const char *annex, gdb_byte *readbuf, const gdb_byte *writebuf, ULONGEST offset, LONGEST len); static int or1k_insert_breakpoint (struct bp_target_info *bpi); static int or1k_remove_breakpoint (struct bp_target_info *bpi); static int or1k_can_use_hw_matchpoint (int type, int count, int othertype); static int or1k_insert_hw_breakpoint (struct bp_target_info *bpi); static int or1k_remove_hw_breakpoint (struct bp_target_info *bpi); static int or1k_insert_watchpoint (CORE_ADDR addr, int len, int type); static int or1k_remove_watchpoint (CORE_ADDR addr, int len, int type); static int or1k_stopped_by_watchpoint(); static int or1k_stopped_data_address (struct target_ops *target, CORE_ADDR *addr_p); static int or1k_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len); static void or1k_resume (ptid_t ptid, int step, enum target_signal sig); static ptid_t or1k_wait (ptid_t remote_ptid, struct target_waitstatus *status); static void or1k_stop (); static void or1k_kill (); static void or1k_create_inferior (char *execfile, char *args, char **env, int from_tty); static void or1k_mourn_inferior (); static void or1k_rcmd (char *command, struct ui_file *outbuf); /*---------------------------------------------------------------------------*/ /*!Ask the user about an interrupt Ctrl-C has been received. */ /*---------------------------------------------------------------------------*/ static void or1k_interrupt_query() { target_terminal_ours (); if (query ("OpenRISC remote JTAG interrupted while waiting for the program\n" "Give up (and stop debugging it)? ")) { const struct gdb_exception e = { .reason = RETURN_QUIT, .error = GENERIC_ERROR, .message = "OpenRISC remote JTAG debugging interrupted" }; or1k_mourn_inferior (); throw_exception (e); } target_terminal_inferior (); } /* or1k_interrupt_query() */ /*---------------------------------------------------------------------------*/ /*!The command line interface's stop routine from an interrupt Attempt to stop the processor. Set a more severe interrupt routine, so that a second ctrl-C will force more aggressive behavior. @param[in] signo The signal which triggered this handle (always SIGINT) */ /*---------------------------------------------------------------------------*/ static void or1k_interrupt (int signo) { quit_flag = 1; /* For passive stops */ or1k_stop (); /* Actively stall the processor */ /* If this doesn't work, try more severe steps. */ signal (signo, or1k_interrupt_twice); } /* or1k_interrupt() */ /*---------------------------------------------------------------------------*/ /*!More aggressive interrupt handler The user typed ^C twice. We ask if they want to kill everything. If they don't we put this signal handler back in place, so another ctrl-C will bring us back heer. @param[in] signo The signal which triggered this handle (always SIGINT) */ /*---------------------------------------------------------------------------*/ static void or1k_interrupt_twice (int signo) { /* Restore the old interrupt handler */ if (NULL != or1k_old_intr_handler) { signal (signo, or1k_old_intr_handler); } or1k_interrupt_query(); /* If we carry on keep this as the signal handler */ signal (signo, or1k_interrupt_twice); } /* or1k_interrupt_twice() */ /*---------------------------------------------------------------------------*/ /*!Translate GDB watchpoint type into data control register compare to bits @param[in] gdb_type GDB watchpoint type @return The corresponding data control register compare to bits */ /*---------------------------------------------------------------------------*/ static unsigned char or1k_gdb_to_dcr_type (enum target_hw_bp_type gdb_type) { switch (gdb_type) { case hw_write: return OR1K_CT_SEA; case hw_read: return OR1K_CT_LEA; case hw_access: return OR1K_CT_AEA; default: error ("or1k_gdb_to_dcr_type: Invalid type %d\n", gdb_type ); return -1; } } /* or1k_gdb_to_dcr_type */ /*---------------------------------------------------------------------------*/ /*!Find the first free matchpoint @return The first free matchpoint, or -1 if none is available. */ /*---------------------------------------------------------------------------*/ static int or1k_first_free_matchpoint () { struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); int i; /* Search for unused matchpoint. */ for (i = 0; i < tdep->num_matchpoints; i++) { if (!or1k_dbgcache.dcr[i].dp) { return i; } } return -1; } /* or1k_first_free_matchpoint() */ /*---------------------------------------------------------------------------*/ /*!Set a breakpoint. @param[in] addr The address at which to set the breakpoint @return 0 if the breakpoint was set, non-zero otherwise */ /*---------------------------------------------------------------------------*/ static int or1k_set_breakpoint (CORE_ADDR addr) { int mp = or1k_first_free_matchpoint(); if (mp < 0) { return 1; } /* Set the value register to the address where we should breakpoint and the control register for unsigned match to the fetched effective address. */ or1k_dbgcache.dvr[mp] = addr; or1k_dbgcache.dcr[mp].dp = 1; or1k_dbgcache.dcr[mp].cc = OR1K_CC_EQ; or1k_dbgcache.dcr[mp].sc = 0; or1k_dbgcache.dcr[mp].ct = OR1K_CT_FETCH; /* No chaining here. Watchpoint triggers a break */ or1k_dbgcache.dmr1 &= ~(OR1K_DMR1_CW << (OR1K_DMR1_CW_SZ * mp)); or1k_dbgcache.dmr2 |= (1 << (mp + OR1K_DMR2_WGB_OFF)); return 0; } /* or1k_set_breakpoint() */ /*---------------------------------------------------------------------------*/ /*!See if a matchpoint has the given qualities The fields in the matchpoint DVR and DCR registers must match and the matchpoint must be in use. @param[in] mp The matchpoint of interest @param[in] addr The address to compare @param[in] cc The condition code to compare @param[in] sc The signedness to compare @param[in] ct The comparision type to compare @return 1 (true) if the fields are the same and the matchpoint is in use */ /*---------------------------------------------------------------------------*/ static int or1k_matchpoint_equal (int mp, CORE_ADDR addr, unsigned char cc, unsigned char sc, unsigned char ct) { int res = or1k_dbgcache.dcr[mp].dp && (or1k_dbgcache.dcr[mp].cc == cc ) && (or1k_dbgcache.dcr[mp].sc == sc ) && (or1k_dbgcache.dcr[mp].ct == ct ) && (or1k_dbgcache.dvr[mp] == addr); return res; } /* or1k_matchpoint_equal() */ /*---------------------------------------------------------------------------*/ /*!Clear a breakpoint. @param[in] addr The address at which to clear the breakpoint @return 0 if the breakpoint was cleared, non-zero otherwise */ /*---------------------------------------------------------------------------*/ static int or1k_clear_breakpoint (CORE_ADDR addr) { struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); int mp; /* Search for matching breakpoint. */ for (mp = 0; mp < tdep->num_matchpoints; mp++) { if (or1k_matchpoint_equal (mp, addr, OR1K_CC_EQ, 0, OR1K_CT_FETCH)) { break; } } if (mp >= tdep->num_matchpoints) { return 1; } /* Mark the matchpoint unused and clear its bits in the assign to counter, watchpoint generating break and breakpoint status bits in DMR2. */ or1k_dbgcache.dcr[mp].dp = 0; or1k_dbgcache.dmr2 &= ~(1 << (mp + OR1K_DMR2_AWTC_OFF)); or1k_dbgcache.dmr2 &= ~(1 << (mp + OR1K_DMR2_WGB_OFF)); or1k_dbgcache.dmr2 &= ~(1 << (mp + OR1K_DMR2_WBS_OFF)); return 0; } /* or1k_clear_breakpoint() */ /*---------------------------------------------------------------------------*/ /*!Garbage collect the HW watchpoints Some functions require more than one OpenRISC 1000 HW watchpoint to be chained together. Chained wathcpoints must be adjacent, but setting of breakpoints (which uses a single HW matchpoint/watchpoint) can lead to fragmentation of the watchpoint list. This function allows the currently used matchpoints to be shuffled up. In other words we have a GARBAGE COLLECTOR (omninous music, thunder clouds gather, lightning flashes). For added fun, watchpoints 8 and 9 cannot be moved, and hence nothing that depends on them. @return The number of free watchpoints */ /*---------------------------------------------------------------------------*/ static int or1k_watchpoint_gc () { struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); unsigned long int bits; int first_free; int first_used; int first_fixed; /* Find the last moveable watchpoint by starting from the top and working down until we find a point where the watchpoint is not dependent on its predecessor. */ for (first_fixed = tdep->num_matchpoints; first_fixed > 0; first_fixed--) { bits = (or1k_dbgcache.dmr1 >> (OR1K_DMR1_CW_SZ * first_fixed)) & OR1K_DMR1_CW; if ((OR1K_DMR1_CW_AND != bits) && (OR1K_DMR1_CW_OR != bits)) { break; /* Chain is broken */ } } /* Give up if there aren't two to be considered */ if (first_fixed < 2) { return first_fixed; } /* Move matchpoints, and hence unused HW watchpoints to the top (i.e to first_fixed - 1). If we move a matchpoint, then all the HW watchpoints above must be shuffled down. Although HW watchpoints refer to matchpoints, it is a fixed reference based on index. So long as the HW watchpoint and the matchpoint are moved together, and the ordering remains unchanged all will be OK. Any chained watchpoints will be adjacent, and will remain adjacent after this exercise. */ first_free = 0; first_used = 0; while (1) { /* Find the first free matchpoint */ for( ; first_free < first_fixed; first_free++ ) { if (!(or1k_dbgcache.dcr[first_free].dp)) { break; } } if (first_free > (first_fixed - 2)) { return first_fixed - first_free; /* No more to move */ } /* Find the first fixed breakpoint */ for (first_used = first_free + 1; first_used < first_fixed; first_used++) { if (or1k_dbgcache.dcr[first_used].dp) { break; } } if (first_used > (first_fixed - 1)) { return first_fixed - first_free; /* No more to move */ } /* Move matchpoint in DVR and DCR registers. */ or1k_dbgcache.dvr[first_free] = or1k_dbgcache.dvr[first_used]; or1k_dbgcache.dcr[first_free] = or1k_dbgcache.dcr[first_used]; or1k_dbgcache.dcr[first_used].dp = 0; /* Copy chaining bits in DMR1. */ bits = (or1k_dbgcache.dmr1 >> (OR1K_DMR1_CW_SZ * first_used)) & OR1K_DMR1_CW; or1k_dbgcache.dmr1 &= ~(OR1K_DMR1_CW << (OR1K_DMR1_CW_SZ * first_used)); or1k_dbgcache.dmr1 &= ~(OR1K_DMR1_CW << (OR1K_DMR1_CW_SZ * first_free)); or1k_dbgcache.dmr1 |= (bits << (OR1K_DMR1_CW_SZ * first_free)); /* Copy assign to counter, watchpoint generating break and breakpoint status bits in DMR2 */ bits = (or1k_dbgcache.dmr2 >> (OR1K_DMR2_AWTC_OFF + first_used)) & 1; or1k_dbgcache.dmr2 &= ~(1 << (OR1K_DMR2_AWTC_OFF + first_used)); or1k_dbgcache.dmr2 &= ~(1 << (OR1K_DMR2_AWTC_OFF + first_free)); or1k_dbgcache.dmr2 |= (bits << (OR1K_DMR2_AWTC_OFF + first_free)); bits = (or1k_dbgcache.dmr2 >> (OR1K_DMR2_WGB_OFF + first_used)) & 1; or1k_dbgcache.dmr2 &= ~(1 << (OR1K_DMR2_WGB_OFF + first_used)); or1k_dbgcache.dmr2 &= ~(1 << (OR1K_DMR2_WGB_OFF + first_free)); or1k_dbgcache.dmr2 |= (bits << (OR1K_DMR2_WGB_OFF + first_free)); bits = (or1k_dbgcache.dmr2 >> (OR1K_DMR2_WBS_OFF + first_used)) & 1; or1k_dbgcache.dmr2 &= ~(1 << (OR1K_DMR2_WBS_OFF + first_used)); or1k_dbgcache.dmr2 &= ~(1 << (OR1K_DMR2_WBS_OFF + first_free)); or1k_dbgcache.dmr2 |= (bits << (OR1K_DMR2_WBS_OFF + first_free)); first_free++; } } /* or1k_watchpoint_gc() */ /*---------------------------------------------------------------------------*/ /*!Find if we were stopped by a watchpoint, and if so which address This is true if a triggered breakpoint was ANDed with the previous watchpoint in the chain. If so, the previous matchpoint has the start address. This is an internal utility for use by or1k_stopped_watchpoint() and or1k_stopped_data_address(). @note This will only find the FIRST watchpoint triggered. @param[out] addr_p Where to put the address associated with the watchpoint if non-NULL @param[out] mp_p Where to put the matchpoint which triggered the WP @return 1 (true) if we get the address, 0 (false) otherwise */ /*---------------------------------------------------------------------------*/ static int or1k_stopped_watchpoint_info (CORE_ADDR *addr_p, int *mp_p) { struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); int mp; /* Cannot be the first matchpoint (it has to AND with one previous) */ for( mp = 1 ; mp < tdep->num_matchpoints ; mp++ ) { if (((or1k_dbgcache.dmr2 >> (mp + OR1K_DMR2_WBS_OFF)) & 1) && (OR1K_DMR1_CW_AND == ((or1k_dbgcache.dmr1 >> (mp * OR1K_DMR1_CW_SZ)) & OR1K_DMR1_CW))) { if (NULL != addr_p) { *addr_p = or1k_dbgcache.dvr[mp - 1]; } if (NULL != mp_p) { *mp_p = mp; } return 1; } } return 0; } /* or1k_stopped_watchpoint_info() */ /*---------------------------------------------------------------------------*/ /*!Convert a register number to SPR number OR1K debug unit has GPRs mapped to SPRs, which are not compact, so we are mapping them for GDB. Rewritten by CZ 12/09/01 @param[in] regnum The register @return The corresponding SPR or -1 on failure */ /*---------------------------------------------------------------------------*/ static int or1k_regnum_to_sprnum (int regnum) { /* The GPRs map as a block */ if (regnum < OR1K_MAX_GPR_REGS) { return OR1K_SPR (OR1K_SPG_SYS, OR1K_SPG_SYS_GPR + regnum); } /* The "special" registers */ switch (regnum) { case OR1K_PPC_REGNUM: return OR1K_NPC_SPRNUM; case OR1K_NPC_REGNUM: return OR1K_NPC_SPRNUM; case OR1K_SR_REGNUM: return OR1K_SR_SPRNUM; default: error ("or1k_regnum_to_sprnum: invalid register number!"); break; } return -1; } /* or1k_regnum_to_sprnum() */ /*---------------------------------------------------------------------------*/ /*!Sync debug registers Synchronizes debug registers in memory with those on target. This used to track if there was any change, but there always is with debuggers, so now we just write them every time. The old code did a lot of this via low-level manipulation of the JTAG interface. For now it is replaced by straightward reading/writing of the SPRs. */ /*---------------------------------------------------------------------------*/ static void or1k_commit_debug_registers() { struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); int i; /* Matchpoints (breakpoints, watchpoints). */ for (i = 0; i < tdep->num_matchpoints; i++) { unsigned long int dcr = 0; dcr |= or1k_dbgcache.dcr[i].dp ? OR1K_DCR_DP : 0; dcr |= (or1k_dbgcache.dcr[i].cc << OR1K_DCR_CC_OFF) & OR1K_DCR_CC; dcr |= or1k_dbgcache.dcr[i].sc ? OR1K_DCR_SC : 0; dcr |= (or1k_dbgcache.dcr[i].ct << OR1K_DCR_CT_OFF) & OR1K_DCR_CT; or1k_jtag_write_spr (OR1K_DVR0_SPRNUM + i, or1k_dbgcache.dvr[i]); or1k_jtag_write_spr (OR1K_DCR0_SPRNUM + i, dcr); } or1k_jtag_write_spr (OR1K_DMR1_SPRNUM, or1k_dbgcache.dmr1); or1k_jtag_write_spr (OR1K_DMR2_SPRNUM, or1k_dbgcache.dmr2); or1k_jtag_write_spr (OR1K_DSR_SPRNUM, or1k_dbgcache.dsr); or1k_jtag_write_spr (OR1K_DRR_SPRNUM, or1k_dbgcache.drr); } /* or1k_commit_debug_registers() */ /*---------------------------------------------------------------------------*/ /*!Start the remote target This is a wrapper for GDB's start_remote function, suitable for use with catch_exception. @param[in] uiout UI handle - not used @param[in] arg_p Reference to the generic argument supplied through catch_exception. In this case a pointer to the from_tty parameter. */ /*--------------------------------------------------------------------------*/ static void or1k_start_remote (struct ui_out *uiout, void *arg_p) { int from_tty = *((int *)arg_p); start_remote( from_tty ); } /* or1k_start_remote() */ /*---------------------------------------------------------------------------*/ /*!Print info on this target. @param[in] target GDB ops for the target - ignored. */ /*---------------------------------------------------------------------------*/ static void or1k_files_info (struct target_ops *target) { const char *status_name[] = { "UNDEFINED", "CONNECTING", "DISCONNECTING", "RUNNING", "STOPPED" }; char *file = "nothing"; if (exec_bfd) { file = bfd_get_filename (exec_bfd); } printf_filtered ("File \"%s\"", file); if (exec_bfd) { printf_filtered ("attached to %s running program %s: ", target_shortname, file); } } /* or1k_files_info() */ /*---------------------------------------------------------------------------*/ /*!Open a connection to the remote server Initialise the connection, then push the current target. @param[in] name The arguments passed to the target command on GDB - usually the address of the remote server @param[in] from_tty 1 (true) if the GDB session is being run from a terminal and so can receive messages. 0 (false) otherwise. */ /*---------------------------------------------------------------------------*/ static void or1k_open (char *name, int from_tty) { struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); int i; unsigned int tmp; struct gdb_exception ex; /* Check nothing's still running. This will call or1k_close if anything is, which will close the connection. Having done this, any remaining target instances should be unpushed from the stack */ target_preopen (from_tty); unpush_target (&or1k_target); /* Initialize the connection to the remote target. */ or1k_jtag_init (name); /* Make sure we have system and debug groups implemented. */ tmp = or1k_jtag_read_spr (OR1K_UPR_SPRNUM); if (0 == (tmp & OR1K_SPR_UPR_UP)) { error ("or1k_open: system group missing"); } if (0 == (tmp & OR1K_SPR_UPR_DUP)) { error ("or1k_open: debug group missing"); } /* Determine number of gpr_regs (this is a bit simplified - the bit just means "less than 32", but we assume that means 16) and the number of supported watchpoints. */ tmp = or1k_jtag_read_spr (OR1K_CPUCFGR_SPRNUM); tdep->num_gpr_regs = (0 == (tmp & OR1K_SPR_CPUCFGR_CGF)) ? 32 : 16; tmp = or1k_jtag_read_spr (OR1K_DCFGR_SPRNUM); tdep->num_matchpoints = (tmp & OR1K_SPR_DCFGR_NDP) + 1; /* Stall the processor. A pause after stalling is appropriate for real hardware. */ or1k_jtag_stall (); usleep (1000); /* Initialize the debug register cache. The DSR is set to stop when breakpoint occurs. The cache will be written out before unstalling the processor. */ for (i = 0; i < tdep->num_matchpoints; i++) { or1k_dbgcache.dvr[i] = 0; memset (&or1k_dbgcache.dcr[i], 0, sizeof (or1k_dbgcache.dcr[i])); } or1k_dbgcache.dmr1 = 0; or1k_dbgcache.dmr2 = 0; or1k_dbgcache.dsr = OR1K_DSR_TE; or1k_dbgcache.drr = 0; /* The remote target connection stalls the target, so all aspects of a running connection are there, except it doesn't actually have execution. So we call target_mark_running, but then immediately mark it as not having execution */ push_target (&or1k_target); target_mark_running (&or1k_target); target_has_execution = 0; /* Get rid of any old shared library symbols. */ no_shared_libraries (NULL, 0); /* We don't have a concept of processs or threads, so we use the null PTID for the target. Set this here before the start_remote() code uses it. */ inferior_ptid = null_ptid; /* Start the remote target. Uses our own wrapper, so we can wrap it to catch the exeception if it goes tits up. */ ex = catch_exception (uiout, or1k_start_remote, &from_tty, RETURN_MASK_ALL); if (ex.reason < 0) { pop_target (); throw_exception (ex); } } /* or1k_open() */ /*---------------------------------------------------------------------------*/ /*!Close a connection to the remote server Use the target extra op is there is one. Don't mourn the inferior - it calls us, so we'll get a never ending loop! param[in] quitting If true (1) GDB is going to shut down, so don't worry to wait for everything to complete. */ /*--------------------------------------------------------------------------*/ static void or1k_close (int quitting) { or1k_jtag_close (); } /* or1k_close() */ /*---------------------------------------------------------------------------*/ /*!Detach from the remote server There is only one remote connection, so no argument should be given. @param[in] args Any args given to the detach command @param[in] from_tty True (1) if this GDB session is run from a terminal, so messages can be output. */ /*---------------------------------------------------------------------------*/ static void or1k_detach (char *args, int from_tty) { if (args) { error ("or1k_detach: \"detach\" takes no arg when remote debugging\n"); } or1k_close (1); if (from_tty) { printf_unfiltered ("Ending remote or1k debugging\n"); } } /* or1k_detach() */ /*---------------------------------------------------------------------------*/ /*!Fetch remote registers The remote registers are fetched into the register cache @param[in] regcache The register cache to use @param[in] regnum The desired register number, or -1 if all are wanted */ /*---------------------------------------------------------------------------*/ static void or1k_fetch_registers (struct regcache *regcache, int regnum) { unsigned long int val; char buf[sizeof (CORE_ADDR) ]; if (-1 == regnum) { /* Get the lot */ for (regnum = 0; regnum < OR1K_NUM_REGS; regnum++) { or1k_fetch_registers (regcache, regnum); } return; } if (regnum >= OR1K_NUM_REGS) { error ("or1k_fetch_registers: invalid register number"); } /* Convert to SPRNUM and read. */ val = or1k_jtag_read_spr (or1k_regnum_to_sprnum (regnum)); /* We got the number the register holds, but gdb expects to see a value in the target byte ordering. This is new for GDB 6.8. Not sure if I need get_thread_regcache() using the ptid instead here. The old code used supply_register(), but that no longer exists, so we hope regcache_raw_supply will do instead. */ store_unsigned_integer (buf, sizeof (CORE_ADDR), val); regcache_raw_supply (regcache, regnum, buf); } /* or1k_fetch_registers() */ /*---------------------------------------------------------------------------*/ /*!Store remote registers The remote registers are written from the register cache @param[in] regcache The register cache to use @param[in] regnum The desired register number, or -1 if all are wanted */ /*---------------------------------------------------------------------------*/ static void or1k_store_registers (struct regcache *regcache, int regnum) { ULONGEST res; if (-1 == regnum) { for (regnum = 0; regnum < OR1K_NUM_REGS; regnum++) { or1k_store_registers (regcache, regnum); } return; } if (regnum >= OR1K_NUM_REGS) { error ("or1k_store_registers: invalid register number"); } regcache = get_current_regcache(); regcache_cooked_read_unsigned (regcache, regnum, &res); or1k_jtag_write_spr (or1k_regnum_to_sprnum (regnum), res); } /* or1k_store_registers() */ /*---------------------------------------------------------------------------*/ /*!Prepare to store registers This is a null function for the OpenRisc 1000 architecture @param[in] regcache The register cache to use */ /*---------------------------------------------------------------------------*/ static void or1k_prepare_to_store (struct regcache *regcache) { return; } /* or1k_prepare_to_store() */ /*---------------------------------------------------------------------------*/ /*!Transfer some data to or from the target One and only one of readbuf or writebuf should be non-NULL, which indicates whether this is a read or write operation. OR1K reads and writes are in words, so we may need to do partial read/writes at each end of the transfer. @param[in] ops The target_ops vector to use @param[in] object The type of object to transfer @param[in] annex Additional object specific information (not used) @param[out] readbuf Buffer for read data @param[in] writebuf Buffer of data to write @param[in] offset Offset into object @param[in] len Max bytes to transer @return Number of bytes transferred or -1 if not supported */ /*---------------------------------------------------------------------------*/ LONGEST or1k_xfer_partial (struct target_ops *ops, enum target_object object, const char *annex, gdb_byte *readbuf, const gdb_byte *writebuf, ULONGEST offset, LONGEST len) { /* Only memory transfer is currently supported */ if (TARGET_OBJECT_MEMORY != object) { return -1; } if (NULL == writebuf) { /* Must be a read */ gdb_assert (NULL != readbuf); return or1k_jtag_read_mem (offset, readbuf, len); } else { return or1k_jtag_write_mem (offset, writebuf, len); } } /* or1k_xfer_partial() */ /*---------------------------------------------------------------------------*/ /*!Insert a breakpoint Try to insert a breakpoint. Use hardware breakpoints if they are supported, software breakpoints otherwise. @param[in] bpi Break point info with details of the address and a cache to hold the existing memory value if overwriting. @return 0 if the breakpoint was set, non-zero otherwise */ /*---------------------------------------------------------------------------*/ static int or1k_insert_breakpoint (struct bp_target_info *bpi) { if (0 == or1k_set_breakpoint (bpi->placed_address)) { return 0; } else { return memory_insert_breakpoint (bpi); } } /* or1k_insert_breakpoint() */ /*---------------------------------------------------------------------------*/ /*!Remove a breakpoint @param[in] bpi Break point info with details of the address and a cache to hold the existing memory value if overwriting. @return 0 if the breakpoint was cleared, non-zero otherwise */ /*---------------------------------------------------------------------------*/ static int or1k_remove_breakpoint (struct bp_target_info *bpi) { /* First try to remove HW breakpoint at address */ if (0 != or1k_clear_breakpoint (bpi->placed_address)) { return memory_remove_breakpoint (bpi); } else { return 0; } } /* or1k_remove_breakpoint() */ /*---------------------------------------------------------------------------*/ /*!Tell whether we can support a hardware breakpoint or watchpoint There are only a fixed number of hardware breakpoints available. Check if there are any left. Hardware watchpoints need TWO matchpoints. This is only an approximation. An exact response would need full knowledge of all the HW resources requested and would need to guarantee those resources were not subsequently cannabalized for non-HW breakpoints and watchpoints. The algorithm is to multiply count by 1 for breakpoints and 2 for watchpoints and add 2 if othertype is set. Any matchpoints already used are ignored (we cannot know if they relate to the question currently being asked). This approach means we will never reject when there is HW breakpoint resource available, but we may sometimes accept when there turns out to be no HW resource available. But GDB handles that OK (see section 5.1.2 in the user guide). @param[in] type What type of matchpoint are we asking about? This function is apparently only called for bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint (but the enum is called access_watchpoint) or bp_hardware_breakpoint @param[in] count How many of this type of matchpoint have been used (including this one) @param[in] othertype 1 (true) if this is a call about a watchpoint and watchpoints (but not breakpoints) of other types have been set. @return the number of watchpoints of this type that can be set if count watchpoints can be set, 0 if watchpoints of this type cannot be set and negative if watchpoints of this type can be set, but there are none available. */ /*--------------------------------------------------------------------------*/ static int or1k_can_use_hw_matchpoint (int type, int count, int othertype) { struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); switch (type) { case bp_hardware_breakpoint: if (count <= tdep->num_matchpoints) { return tdep->num_matchpoints; } else { return -1; } case bp_hardware_watchpoint: case bp_read_watchpoint: case bp_access_watchpoint: if ((2 * (othertype + count)) <= tdep->num_matchpoints) { return tdep->num_matchpoints / (2 * (othertype + count)); } else { return -1; } default: warning( "Request to use unknown hardware matchpoint type: %d\n", type ); return 0; } } /* or1k_can_use_hw_matchpoint() */ /*---------------------------------------------------------------------------*/ /*!Insert a hardware breakpoint Try to insert a hardware breakpoint if they are supported. @param[in] bpi Break point info with details of the address and a cache to hold the existing memory value if overwriting. @return 0 if the breakpoint was set, non-zero otherwise */ /*---------------------------------------------------------------------------*/ static int or1k_insert_hw_breakpoint (struct bp_target_info *bpi) { return or1k_set_breakpoint (bpi->placed_address); } /* or1k_insert_hw_breakpoint() */ /*---------------------------------------------------------------------------*/ /*!Remove a hardware breakpoint @param[in] bpi Break point info with details of the address and a cache to hold the existing memory value if overwriting. @return 0 if the breakpoint was cleared, non-zero otherwise */ /*---------------------------------------------------------------------------*/ static int or1k_remove_hw_breakpoint (struct bp_target_info *bpi) { return or1k_clear_breakpoint (bpi->placed_address); } /* or1k_remove_hw_breakpoint() */ /*---------------------------------------------------------------------------*/ /*!Set a data watchpoint. A GDB data watchpoint uses a pair of HW watchpoints. The first looks for accesses greater than or equal to the start address, the second looks for accesses less than or equal to the end address. This allows watching of any length of object. However because of the way the OpenRISC 1000 chains its watchpoints, a suitable adjacent pair must be found. So the watchpoint garbage collector is used to shuffle them all up. @param[in] addr Address to be watched @param[in] len Length of the entity to be watched @param[in] type hw_write (0) for a write watchpoint, hw_read (1) for a read watchpoint, or hw_access (2) for a read/write watchpoint. @return 0 if the watchpoint was set, -1 otherwise (it must be -1, not just any non-zero number, since breakpoint.c tests explicitly for -1 */ /*--------------------------------------------------------------------------*/ static int or1k_insert_watchpoint (CORE_ADDR addr, int len, int type) { unsigned char dcr_ct = or1k_gdb_to_dcr_type (type); int first_free; if (len < 1) { return -1; } /* Garbage collect and see if we have two adjacent watchpoints available. */ if( or1k_watchpoint_gc() < 2 ) { return -1; } /* Set lower bound at first free matchpoint. */ first_free = or1k_first_free_matchpoint(); or1k_dbgcache.dvr[first_free] = addr; or1k_dbgcache.dcr[first_free].dp = 1; or1k_dbgcache.dcr[first_free].cc = OR1K_CC_GE; or1k_dbgcache.dcr[first_free].sc = 0; or1k_dbgcache.dcr[first_free].ct = dcr_ct; /* Set upper watchpoint bound at next matchpoint. GC guarantees it is free. */ first_free++; or1k_dbgcache.dvr[first_free] = addr + len - 1; or1k_dbgcache.dcr[first_free].dp = 1; or1k_dbgcache.dcr[first_free].cc = OR1K_CC_LE; or1k_dbgcache.dcr[first_free].sc = 0; or1k_dbgcache.dcr[first_free].ct = dcr_ct; /* Set && chaining of the second matchpoint to the first. This is the only one which should generate a breakpoint, since it only occurs when BOTH matchpoints trigger. */ or1k_dbgcache.dmr1 &= ~(OR1K_DMR1_CW << (OR1K_DMR1_CW_SZ * first_free)); or1k_dbgcache.dmr1 |= (OR1K_DMR1_CW_AND << (OR1K_DMR1_CW_SZ * first_free)); or1k_dbgcache.dmr2 |= (1 << (first_free + OR1K_DMR2_WGB_OFF)); return 0; } /* or1k_insert_watchpoint() */ /*---------------------------------------------------------------------------*/ /*!Remove a data watchpoint. @param[in] addr Address being watched @param[in] len Length of the entity being watched @param[in] type 0 for a write watchpoint, 1 for a read watchpoint, or 2 for a read/write watchpoint @return 0 if the watchpoint was cleared, non-zero otherwise */ /*---------------------------------------------------------------------------*/ static int or1k_remove_watchpoint (CORE_ADDR addr, int len, int type) { struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); unsigned char dcr_ct; CORE_ADDR end_addr; int mp; if (len < 1) { return -1; } dcr_ct = or1k_gdb_to_dcr_type (type); end_addr = addr + len - 1; /* Find the right one. PS. Don't be tempted to compare mp against tdep->num_matchpoints - 1. It's unsigned and can be 0, so you'd go on for ever! */ for (mp = 0; (mp + 1) < tdep->num_matchpoints; mp++) { if (or1k_matchpoint_equal( mp, addr, OR1K_CC_GE, 0, dcr_ct) && or1k_matchpoint_equal( mp + 1, end_addr, OR1K_CC_LE, 0, dcr_ct)) { break; } } if ((mp + 1) >= tdep->num_matchpoints) { return -1; } /* Mark each matchpoint unused and clear the bits for the second watchpoint in the assign to counter, watchpoint generating break and breakpoint status bits in DMR2. */ or1k_dbgcache.dcr[mp].dp = 0; mp++; or1k_dbgcache.dcr[mp].dp = 0; or1k_dbgcache.dmr2 &= ~(1 << (mp + OR1K_DMR2_AWTC_OFF)); or1k_dbgcache.dmr2 &= ~(1 << (mp + OR1K_DMR2_WGB_OFF)); or1k_dbgcache.dmr2 &= ~(1 << (mp + OR1K_DMR2_WBS_OFF)); return 0; } /* or1k_remove_watchpoint() */ /*---------------------------------------------------------------------------*/ /*!Report if we stopped due to a watchpoint All the information is calculated by or1k_stopped_data_address, so we must reuse that. @return 1 (true) if we were stopped by a watchpoint, 0 (false) otherwise */ /*---------------------------------------------------------------------------*/ static int or1k_stopped_by_watchpoint() { return or1k_stopped_watchpoint_info (NULL, NULL); } /* or1k_stopped_by_watchpoint() */ /*---------------------------------------------------------------------------*/ /*!Address for which we were stopped by a remote watchpoint This is true if a triggered breakpoint was ANDed with the previous watchpoint in the chain. If so, the previous matchpoint has the start address. This function is called once when a watchpoint is hit, and must clear the watchpoint status @param[in] target The target_ops we are using. Not clear why we need this! @param[out] addr_p Where to put the address associated with the watchpoint. @return 1 (true) if we get the address, 0 (false) otherwise */ /*---------------------------------------------------------------------------*/ static int or1k_stopped_data_address (struct target_ops *target, CORE_ADDR *addr_p) { int mp; /* Clear the result info if there was a watchpoint */ if( or1k_stopped_watchpoint_info (addr_p, &mp)) { or1k_dbgcache.dmr2 &= ~(1 << (mp + OR1K_DMR2_WBS_OFF)); return 1; } else { return 0; } } /* or1k_stopped_data_address() */ /*---------------------------------------------------------------------------*/ /*!Can we put a HW watchpoint of the given size at the given address We can always use a HW watchpoint, so long as there are HW watchpoints available. This doesn't have to check availablility (see or1k_can_use_hw_matchpoint(). @param[in] addr The address of interest @param[in] len The length of the region to watch @return 1 (true) to indicate we always can do a HW watchpoint */ /*---------------------------------------------------------------------------*/ static int or1k_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len) { return 1; } /* or1k_region_ok_for_hw_watchpoint */ /*---------------------------------------------------------------------------*/ /*!Resume execution of the target process. "step" says whether to single-step or to run free; "siggnal" is the signal value (e.g. SIGINT) to be given to the target, or zero for no signal. When we enter this routine the target should be stalled. In general GDB sorts out issues of restarting across breakpoints. However have to deal with the special case where a breakpoint occurred in the delay slot of a branch instruction. In this case the branch should be restarted, BUT ONLY if the branch had originally been executed. For now we ignore this case (it really is very hard. @param[in] ptid The process or thread ID - ignored here @param[in] step If true (1) single step the target @param[in] sig Signal to give to the target */ /*---------------------------------------------------------------------------*/ static void or1k_resume (ptid_t ptid, int step, enum target_signal sig) { /* Note if we are single stepping. For use when waiting */ or1k_is_single_stepping = step; /* The debug reason register and the watchpoint break status are both cleared before resuming. */ or1k_dbgcache.drr = 0; or1k_dbgcache.dmr2 &= ~OR1K_DMR2_WBS_MASK; /* Set single stepping if required */ if (step) { or1k_dbgcache.dmr1 |= OR1K_DMR1_ST; } else { or1k_dbgcache.dmr1 &= ~OR1K_DMR1_ST; } or1k_commit_debug_registers(); /* We can now continue normally, independent of step. If this is called for the first time due to a run command, we won't actually be executing, so start the target running. */ or1k_jtag_write_spr( OR1K_NPC_SPRNUM, read_pc()); target_has_execution = 1; or1k_jtag_unstall (); } /* or1k_resume() */ /*---------------------------------------------------------------------------*/ /*!Wait until the remote server stops, and return a wait status. Seems to assume that the remote target is identified solely by PID with no thread or lightweight thread component. This is mostly a case of just sorting out the type of exception. GDB will automatically sort out restarting with breakpoints removed etc. @note The old code differentiated a high priority and a low priority interrupt, which no longer exists on the OR1K. The old code also omitted tick timer and floating point exceptions, which have been added. @param[in] remote_ptid The process/thread ID of the remote target @param[out] status Status of the waiting process @return The remote_ptid unchanged */ /*---------------------------------------------------------------------------*/ static ptid_t or1k_wait (ptid_t remote_ptid, struct target_waitstatus *status) { unsigned long int addr; char buf[OR1K_INSTLEN]; int res; /* Set new signal handler (so we can interrupt with ctrl-C) and then wait for the OR1K to stall. */ or1k_old_intr_handler = signal (SIGINT, or1k_interrupt); or1k_jtag_wait (or1k_is_single_stepping); signal (SIGINT, or1k_old_intr_handler); /* Registers and frame caches are now all unreliable */ registers_changed(); /* Refresh the debug registers that may have changed */ or1k_dbgcache.drr = or1k_jtag_read_spr (OR1K_DRR_SPRNUM); or1k_dbgcache.dmr2 = or1k_jtag_read_spr (OR1K_DMR2_SPRNUM); /* If we got a trap, then it was a breakpoint/watchpoint of some sort (but not single step, which does not set the trap exception). We need to back up the program counter, so the instruction will be re-executed. This must be the value of the PPC, in case we have just done a branch. */ if (OR1K_DRR_TE == (or1k_dbgcache.drr & OR1K_DRR_TE)) { write_pc (or1k_jtag_read_spr (OR1K_PPC_SPRNUM)); } /* Single step does not set trap exception, so we set it manually to simplify our code. */ if (OR1K_DMR1_ST == (or1k_dbgcache.dmr1 & OR1K_DMR1_ST)) { or1k_dbgcache.drr |= OR1K_DRR_TE; } status->kind = TARGET_WAITKIND_STOPPED; /* Map OR1K exception to GDB signal. If multiple signals are set, only the least significant in the DRR is used (the expression here yields the LSB in a 2's complement machine) */ switch (or1k_dbgcache.drr & (-or1k_dbgcache.drr)) { case OR1K_DRR_RSTE: status->value.sig = TARGET_SIGNAL_PWR; break; case OR1K_DRR_BUSEE: status->value.sig = TARGET_SIGNAL_BUS; break; case OR1K_DRR_DPFE: status->value.sig = TARGET_SIGNAL_SEGV; break; case OR1K_DRR_IPFE: status->value.sig = TARGET_SIGNAL_SEGV; break; case OR1K_DRR_TTE: status->value.sig = TARGET_SIGNAL_ALRM; break; case OR1K_DRR_AE: status->value.sig = TARGET_SIGNAL_BUS; break; case OR1K_DRR_IIE: status->value.sig = TARGET_SIGNAL_ILL; break; case OR1K_DRR_INTE: status->value.sig = TARGET_SIGNAL_INT; break; case OR1K_DRR_DME: status->value.sig = TARGET_SIGNAL_SEGV; break; case OR1K_DRR_IME: status->value.sig = TARGET_SIGNAL_SEGV; break; case OR1K_DRR_RE: status->value.sig = TARGET_SIGNAL_FPE; break; case OR1K_DRR_SCE: status->value.sig = TARGET_SIGNAL_USR2; break; case OR1K_DRR_FPE: status->value.sig = TARGET_SIGNAL_FPE; break; case OR1K_DRR_TE: status->value.sig = TARGET_SIGNAL_TRAP; break; default: /* This just means the target stopped without raising any interrupt. This happens at reset and exit. The latter we distinquish by looking at the instruction just executed, to see if it is "l.nop NOP_EXIT". If this is the case, get the result from GPR 3 and set the NPC to the reset vector, so a new start will behave well. */ addr = or1k_jtag_read_spr (OR1K_PPC_SPRNUM); res = read_memory_nobpt (addr, buf, OR1K_INSTLEN); if (0 != res) { memory_error (res, addr); } if (OR1K_NOP_EXIT == (unsigned long int)(extract_unsigned_integer (buf, OR1K_INSTLEN))) { ULONGEST val; regcache_cooked_read_unsigned(get_current_regcache(), OR1K_FIRST_ARG_REGNUM, &val); status->value.integer = val; status->kind = TARGET_WAITKIND_EXITED; write_pc (OR1K_RESET_VECTOR); } else { status->value.sig = TARGET_SIGNAL_DEFAULT; } break; } /* Clear the reason register */ or1k_dbgcache.drr = 0; return remote_ptid; } /* or1k_wait() */ /*---------------------------------------------------------------------------*/ /*!Stop the remote process This is the generic stop called via the target vector. When a target interrupt is requested, either by the command line or the GUI, we will eventually end up here. Just stall the processor, put it into single step mode and unstall. */ /*---------------------------------------------------------------------------*/ static void or1k_stop () { /* We should not stop the target immediately, since it can be in an unfinished state. So we do a single step. This should not affect anything. */ or1k_jtag_stall(); /* HW STEP. Set OR1K_DMR1_ST. */ or1k_dbgcache.dmr1 |= OR1K_DMR1_ST; or1k_commit_debug_registers(); or1k_jtag_unstall(); } /* or1k_stop () */ /*---------------------------------------------------------------------------*/ /*!Kill the process running on the board We just ignore the target. Mourning the inferior will cause the connection to be closed. */ /*---------------------------------------------------------------------------*/ static void or1k_kill () { or1k_mourn_inferior (); } /* or1k_kill () */ /*---------------------------------------------------------------------------*/ /*!Start running on the target board by creating an inferior process @param[in] execfile What to run @param[in] args Arguments to pass to the inferior process @param[in] env Environment for the inferior process @param[in] from_tty 1 (true) if this session can write to the terminal */ /*---------------------------------------------------------------------------*/ static void or1k_create_inferior (char *execfile, char *args, char **env, int from_tty) { CORE_ADDR entry_pt; if ((NULL != args) && ('\0' != args[0])) { warning ("or1k_create_inferior: " "can't pass arguments to remote OR1K board - ignored"); /* And don't try to use them on the next "run" command. */ execute_command ("set args", from_tty); } if ((NULL == execfile) || (NULL == exec_bfd)) { warning ( "or1k_create_inferior: no executable file symbols specified\n" "execution will proceed without symbol table. Use the \"file\"\n" "command to rectify this.\n"); } /* The code won't actually start executing until it is unstalled in or1k_resume(), so we'll call target_mark_running() there. Tidy up from last time we were running. */ init_wait_for_inferior (); } /* or1k_create_inferior () */ /*---------------------------------------------------------------------------*/ /*!Mourn the inferior process We don't atually want to unpush the target - we should be able to call run again to restart it. Use the generic mourn and mark it as exited (it it was running). */ /*---------------------------------------------------------------------------*/ static void or1k_mourn_inferior () { generic_mourn_inferior (); if( target_has_execution ) { target_mark_exited (&or1k_target); } } /* or1k_mourn_inferior () */ /*---------------------------------------------------------------------------*/ /*!Send a command to the remote target The target can't actually run any remote commands, in the sense of having a command interpreter. However we use this as a GDB "standard" way of wrapping up commands to access the SPRs. Current commands supported are: - readspr <regno> - writespr <regno> <value> The output is either the value read (for successful read) or OK (for successful write) or E01 to indicate and wrror. All values are represented as unsigned hex. @param[in] command The command to execute @param[out] output The result of the command */ /*---------------------------------------------------------------------------*/ static void or1k_rcmd (char *command, struct ui_file *outbuf) { /* Sort out which command */ if (0 == strncmp ("readspr", command, strlen ("readspr"))) { unsigned int regno; /* SPR to read */ if (1 != sscanf (command, "readspr %4x", ®no)) { error ("or1k_rcmd: unrecognized readspr"); fputs_unfiltered ("E01", outbuf); } else { char strbuf[sizeof ("ffffffff")]; ULONGEST data = or1k_jtag_read_spr (regno); sprintf (strbuf, "%8llx", (long long unsigned int)data); fputs_unfiltered (strbuf, outbuf); } } else if (0 == strncmp ("writespr", command, strlen ("writespr"))) { unsigned int regno; /* SPR to write */ long long unsigned int data; /* Value to write */ if (2 != sscanf (command, "writespr %4x %8llx", ®no, &data)) { error ("or1k_rcmd: unrecognized writespr"); fputs_unfiltered ("E01", outbuf); } else { or1k_jtag_write_spr (regno, data); fputs_unfiltered ("OK", outbuf); } } else { error ("or1k_rcmd: unrecognized remote command"); fputs_unfiltered ("E01", outbuf); } } /* or1k_rcmd () */ /*---------------------------------------------------------------------------*/ /*!Main entry point for the remote OpenRISC JTAG protocol Initializes the target ops for each version of the remote protocol. Currently only the JTAG protocol is implemented. @note Earlier versions of this code provided for a "sim" and "dummy" target. However these never had any functionality, so have been deleted. @return New CRC */ /*---------------------------------------------------------------------------*/ void _initialize_remote_or1k() { /* Set up the JTAG ops. */ or1k_target.to_shortname = "jtag"; or1k_target.to_longname = "OpenRISC 1000 debugging over JTAG port"; or1k_target.to_doc = "Debug a board using the OpenRISC 1000 JTAG debugging protocol. The\n" "target may be connected directly via the parallel port, or may be a\n" "remote connection over TCP/IP to another machine, an instance of the\n" "Or1ksim architectural simulator, or physical hardware connected by USB\n" "with its own standalone control program.\n" "\n" "The argument is the parallel port device (e.g. /dev/jp) to which it is\n" "connected locally or a URL of the form jtag://<hostname>:<port> or\n" "jtag://<hostname>:<service> identifying the remote connection."; or1k_target.to_files_info = or1k_files_info; or1k_target.to_stratum = process_stratum; or1k_target.to_has_all_memory = 1; or1k_target.to_has_memory = 1; or1k_target.to_has_stack = 1; or1k_target.to_has_registers = 1; or1k_target.to_has_execution = 0; or1k_target.to_have_steppable_watchpoint = 0; or1k_target.to_have_continuable_watchpoint = 0; or1k_target.to_open = or1k_open; or1k_target.to_close = or1k_close; or1k_target.to_detach = or1k_detach; or1k_target.to_fetch_registers = or1k_fetch_registers; or1k_target.to_store_registers = or1k_store_registers; or1k_target.to_prepare_to_store = or1k_prepare_to_store; or1k_target.to_load = generic_load; or1k_target.to_xfer_partial = or1k_xfer_partial; or1k_target.to_insert_breakpoint = or1k_insert_breakpoint; or1k_target.to_remove_breakpoint = or1k_remove_breakpoint; or1k_target.to_can_use_hw_breakpoint = or1k_can_use_hw_matchpoint; or1k_target.to_insert_hw_breakpoint = or1k_insert_hw_breakpoint; or1k_target.to_remove_hw_breakpoint = or1k_remove_hw_breakpoint; or1k_target.to_insert_watchpoint = or1k_insert_watchpoint; or1k_target.to_remove_watchpoint = or1k_remove_watchpoint; or1k_target.to_stopped_by_watchpoint = or1k_stopped_by_watchpoint; or1k_target.to_stopped_data_address = or1k_stopped_data_address; or1k_target.to_region_ok_for_hw_watchpoint = or1k_region_ok_for_hw_watchpoint; or1k_target.to_resume = or1k_resume; or1k_target.to_wait = or1k_wait; or1k_target.to_stop = or1k_stop; or1k_target.to_kill = or1k_kill; or1k_target.to_create_inferior = or1k_create_inferior; or1k_target.to_mourn_inferior = or1k_mourn_inferior; or1k_target.to_rcmd = or1k_rcmd; or1k_target.to_magic = OPS_MAGIC; /* Tell GDB about the new target */ add_target (&or1k_target); } /* _initialize_remote_or1k() */ /* EOF */
Go to most recent revision | Compare with Previous | Blame | View Log