Thu Nov 2 08:54:04 1995 Michael Meissner * configure.in: Rewrite --enable-sim switch handling to use the autoconf builtins so it works correctly if the configure or Makefile.in files are modified and make decides to rebuild Makefile. Also document all of the --enable-sim switches supported. Check whether getrusage and sys/resource.h are supported. * config.in: Regenerate. * configure: Regenerate. * Makefile.in: Add support for all of the variables set with --enable-sim switches. * Makefile.in (clean): make clean now removes all built sources as well. * cpu.c: Use HAVE_STRING_H, HAVE_STRINGS_H, HAVE_UNISTD_H, HAVE_TIME_H, HAVE_SYS_TIMES_H, HAVE_SYS_RESOURCE_H defined in the generated config.h. * debug.c: Ditto. * device_tree.c: Ditto. * devices.c: Ditto. * dgen.c: Ditto. * emul_netbsd.c: Ditto. * igen.c: Ditto. * lf.c: Ditto. * misc.c: Ditto. * psim.c: Ditto. * registers.c: Ditto. * sim_calls.c: Ditt. * table.c: Ditto. * main.c (main): Call psim_print_info with verbose == 2. * mon.c (mon_print_info): Align the cpu number and number of instructions fields. Do not print an instruction category if the CPU did not execute any of those instructions. Print out number of reads and writes. If getrusage is supported, print out number of simulated instructins per second. * configure.in: Add support for --enable-sim-opcode=stupid. * configure: Regenerate. Wed Nov 1 23:46:59 1995 Andrew Cagney - aka Noid * std-config (INLINE_DEVICE_TREE): Don't inline either of device_tree.c or devices.c. There is no significant gain. * configure.in, Makefile.in: add --enable-sim-icache=[0-9]* and IGEN_ICACHE macro. Wed Nov 1 23:46:59 1995 Andrew Cagney - aka Noid * igen.c (main), misc.h (target_a2i, i2target), misc.c: Add functions to convert between target and igen internal bit numbers. Make IO go through these functions. Add -b (bit size) and -h (high bit nr) options to igen. Typical usage would be: ./igen -b 16 -h 15 for a 16 bit instruction format with the msb given a number 15. Wed Nov 1 22:17:32 1995 Andrew Cagney - aka Noid * dgen.c (main): Was outputting optarg even when it was NULL. Tue Oct 31 23:48:33 1995 Andrew Cagney - aka Noid * vm_n.h (vm_data_map_load_N, vm_data_map_store_n), debug.h, debug.c: Add tracing of load/store unit (virtual) with -t load-store. Tue Oct 31 21:44:01 1995 Andrew Cagney - aka Noid * std-config.h (WITH_ENVIRONMENT): Add USER_ENVIRONMENT which does not include things such as the time base and events. * interrupt.c, sim_calls.c, cpu.h, vm.c, configure.in: Add UEA to all environment switches for above. * psim.c (psim_create): ditto - new device tree node name is /options/environment-architecture with values user, virtual and operating. Tue Oct 31 21:31:32 1995 Andrew Cagney - aka Noid * ppc-opcode-stupid: Third example of use of opcode table - this one expands all mtspr/mfspr and branch instructions. Appears to give about a 10% gain in performance if everything enabled. Also takes about 150mb of swap to build. Wed Nov 1 10:49:48 1995 Michael Meissner * emul_netbsd.c (do_exit): Print arguments and close parenthesis if tracing, since exit doesn't go through emul_exit_call. (do_read): Print arguments if tracing. (do_write): Ditto. (do_open): Ditto. (do_break): Ditto. (do_kill): Ditto. (do_dup): Ditto. (do_sigprocmask): Replace trace with printing arguments if tracing. (do_ioctl): Print arguments if tracing. (do_umask): Ditto. (do_dup2): Ditto. (do_fcntl): Ditto. (do_gettimeofday): Ditto. (do_getrusage): Ditto. (do_fstatfs): Ditto. * filter_filename.c: New file to provide filter_filename to strip the directory prefix from a file. * filter_filename.h: New include file to declare filter_filename. * debug.h: Include filter_filename.h. (TRACE,DTRACE,ERROR): Use filter_filename on __FILE__. * misc.h: Include filter_filename.h. (ASSERT): Use filter_filename on __FILE__. * igen.c (lf_print_my_prefix): Use filter_filename on the filename argument. * Makefile.in: Add filter_filename support. * ppc-instructions (dcbi, icbi): Make these NOPs rather than invalid instructions. * configure.in: Add support for more --enable-sim-* switches. Use config.make and config.hdr to write to Makefile and config.h respectively. Don't rewrite Makefile, just append to it. * configure: Regenerate. * config.{make,hdr}: New shell scripts. * Makefile.in: Remove all variables set by configure.in. (psim.o): Depend on $(BUILT_SRC) also. * emul_netbsd.c (do_gettimeofday,do_getrusage): When comparing an integer, use 0, not NULL. Tue Oct 31 15:20:04 1995 Michael Meissner * configure.in: Add support for --enable-sim-inline, --enable-sim-bswap, --enable-sim-cflags, --enable-sim-complex, --enable-sim-switch, --enable-sim-duplicate, --enable-sim-filter, and --enable-sim-endian switch to control various Makefile variables. * configure: Regenerate from configure.in. * Makefile.in: Add various Make variables that the various switches alter. * std-config.h (DEFAULT_INLINE): Don't set this to 2 if using GCC and optimizing by default. Fri Oct 27 19:26:27 1995 Andrew Cagney * bits.h (ROTL32, ROTL64): Were functions, made them macros, now make them functions again. Appears 2.6.3 is confused by just a macro. Thu Oct 26 18:31:58 1995 Andrew Cagney * ppc-endian.c (SWAP_8): Fix 8 byte swap! * psim.c (psim_create): Not correctly checking that runtime configuration of things like ENDIAN, ENVIRONMENT and ALIGNMENT matched the compiled in ones. * debug.h (ITRACE), igen.c: Tidy up more tracing flags - trace_semantics is now different to trace_idecode, the former checks the cache. Tue Oct 24 21:54:13 1995 Andrew Cagney * ppc-instructions (mtsrin): Missing instruction * ppc-instructions (mfsrin): Missing instruction * ppc-instructions (eieio): Missing instruction Tue Oct 24 20:55:29 1995 Andrew Cagney * build-psim: New shell script - see internals for usage, simplifies the process of building custom simulators. Mon Oct 23 23:48:59 1995 Andrew Cagney * std-config.h (SEMANTICS_INLINE): Tidy up notes on each of the INLINE macros. Make SEMANTICS_INLINE == 1 if DEFAULT_INLINE == 2. Don't use DEFAULT_INLINE to define REGISTERS_INLINE DEVICES_INLINE DEVICE_TREE_INLINE or INTERRUPTS_INLINE as none of these are on the instruction or data critical paths. * FIXME: need to set up OS_EMUL_INLINE/EMUL_GENERIC_INLINE but not on critical path. * FIXME: devices.c/emul_netbsd.c would benefit (slightly) from the inclusion of device_tree.c/emul_generic.c. Mon Oct 23 00:31:50 1995 Andrew Cagney * os_emul.[hc], emul_generic.[hc], emul_netbsd.[hc]: replace system.[hc]. Start of suport for multiple emulations and emulation state (os_emul object). * emul_generic.[hc]: Start of code to implement proper system call tracing (from spy). Sun Oct 22 21:33:51 1995 Andrew Cagney * cpu.h, cpu.c (cpu_init): New function, zero the registers before the processor is started. Fixes problem of registers being undefined when restarting from within gdb. * cpu.h, cpu.c (cpu_flush_icache): New function, flushes the instruction cache (if present). Fixes problem of cpu caching gdb breakpoint instructions. FIXME: PSIM sometimes aborts calling error(), it should instead call sim_error() say which takes care of housekeeping such as saving the CIA before calling error. * NOTE: cpu_flush_cache() instead of cpu_synchronize_context() is used when restarting a simulation because the latter has the unwanted side effect (well I as a kernel hacker think it is) of performing an isync when the instruction stream doesn't contain one. Sun Oct 22 19:27:48 1995 Andrew Cagney * mon.h (new), mon.c (new), std-config.h (WITH_MON): Performance monitoring module. Counts both instructions issued and load/stores. * NOTE: mon does not contain to count instruction loads as this information is already available from the mon_issue() hook. * FIXME: mon doesn't have access to register usage information. This is needed if the user wants to monitor things like register stalls. * igen.c (lf_print_c_semantic), vm_n.h: Add counting code. * psim.h, psim.c (psim_create), cpu.h, cpu.c (cpu_create): Attach a common monitor to each of the cpus. Delete cpu_increment_number_of_insns() and cpu_get_number_of_insns() replaced by copied code in mon.[hc]. Sun Oct 22 18:42:45 1995 Andrew Cagney * sim_calls.c, main.c, psim.c (psim_create): always create `WITH_SMP' cpus. The actual number of CPU's active in a simulation run is taken from the device node: /init/smp (an integer). WITH_SMP changed to 2 (remember to put it back to 0). Fri Oct 20 17:26:54 1995 Andrew Cagney * system.c: More system call emulation. If code appears NetBSD specific, make conditional to being compiled on a NetBSD system (sigh). Wed Oct 18 23:02:20 1995 Andrew Cagney * Makefile.in, gen.c(delete), igen.c(new), dgen.c(new), lf.[ch](new), table.[ch](new): Split into two generators - igen that outputs the instruction tables and dgen that outputs the spr tables. Add -f (filter out) flag to igen to filter out certain instructions (ex 64 bit ones) from the created tables. Include $(LIBIBERTY_LIB) in link options in case host lacks some libc functions. * NOTE: igen, since it was originally written for the PowerPC/RS6000, things the MSB is 0 and the LSB is 63{31}. * Makefile.in, std-config.h, ppc-cache-rules(new), ppc-opcode-complex(new), ppc-opcode-simple(new): (for igen) Create cache-rule and opcode-rule tables from macros found std-config.h. Delete corresponding macro's from std-config.h. * FIXME: under this new igen scheme, when playing around with igen options, you'll find that depenencies don't work very well. * igen.c (gen_itable_c, gen_itable_h), Makefile.in: code to output an table of all the instructions. Code to output a type enumerating all the instructin names. * igen.c(lf_print_c_semantic): Move call to increment instruction counter so that it occures _after_ the instruction has been fully validated, was double counting illegal/invalid instructions. Add conditional so only compiled in when WITH_PROFILE enabled (enabled by default). * igen.c, cpu.h, cpu.c(cpu_increment_number_of_insns): Include itable.h, count individual instruction types not just total, adjust reporting functions to output this. * ppc-instructions (64 bit Load Doubleword with Update Indexed): Had 32./ instead of 31./ * ppc-instructions (64 bit Store Double Word Conditional Indexed): bitrot - updated to use newer CR register operators. * ppc-instructions (64bit Floating Convert from Integer Doubleword): Correct call to Round_Float(). Mon Oct 16 00:31:20 1995 Andrew Cagney * basics.h: #include "sim_callbacks.h" earlier so that its prototypes are declared in all other header files. * bits.h, bits.c, idecode_expression.h (ROTL32, ROTL64): Update doc in bits.h, remove dead code in bits.c, move ROTL32/ROTL64 into bits.h. * FIXME: the bits.h/bits.c macro's should be replaced with (inline) c functions. * cpu.c(cpu_add_commas), device_tree.h, device_tree.c(scand_*): Add size of buffer argument to functions writing a string into a buffer. Check for buffer overflow. Sun Oct 15 22:16:11 1995 Andrew Cagney * devices.h, devices.c, debug.h, debug.c: add macro's for tracing of each device. Make parameter names consistent so macros work. Use macro's in device functions. * device_tree.c, devices.h, devices.c: include path to device in a devices node when creating it. * device_tree.c, debug.h, debug.c: Add tracing of `device-tree'. * core.c: add tracing of core-device, adjust parameter names in core functions to be consistent with those in devices*. Sun Oct 15 20:33:20 1995 Andrew Cagney * debug.h, debug.c (trace_option): New function. Parses the trace option, updating the trace array. * debug.h, debug.c (trace_usage): New function. Outputs the list of all possible trace options. * sim_calls.c (sim_open), main.c (main): Use new trace_option() to parse trace options specified with the simpler -t flag. Adjust usage. * FIXME: basic parsing of command line options is still duplicated by main.c and sim_calls.c Thu Oct 26 10:42:28 1995 Michael Meissner * Makefile.in (clean): Delete *.i and *.out files. * ppc-endian.c (SWAP_n): Add SET argument to allow use of SWAP macros for either assignment or return. Fix SWAP_8 to use a union, and two SWAP_4's. Delete SWAP_N, since nobody uses it now. (ENDIAN_N): Add SET argument to SWAP_n calls. Delete macro defs that hardwired swapping on/off, let optimizer delete dead code. * main.c (main): Add printf that we caught a signal and print out the failing address. Thu Oct 19 21:43:39 1995 Fred Fish * Makefile.in: Remove tabs from otherwise empty line. Confuses many non-GNU versions of "make". Wed Oct 18 08:51:25 1995 Michael Meissner * Makefile.in (clean): Delete files produced by gen. Mon Oct 16 17:34:24 1995 Michael Meissner * gen.c (lf_print_c_semantic_function): Move counting # of instructions here so it works with caching. (gen_idecode_c): Move from here. Wed Oct 11 17:13:15 1995 Andrew Cagney * gen.c, ppc-instructions, psim.c: Fix code for generating cracking instruction cache. Delete the code that cached just the result from doing an instruction lookup - this ran slower than no cache at all. Fri Oct 13 09:58:43 1995 Michael Meissner * Makefile.in (gen.o): Include $(INLINE_CFLAGS). * debug.h (ppc_trace): Rename from trace, to avoid a conflict with TCL when gdb is linked with the simulator. * debug.c (ppc_trace): Ditto. * sim_calls.c (sim_open): Change trace -> ppc_trace. * main.c (main): Ditto. * cpu.c (cpu_add_commas): Remove extra static. Thu Oct 12 11:35:53 1995 Michael Meissner * Makefile.in (psim.o): Now that inlines are turned on, make psim.o depend on all sources. * cpu.c (cpu_add_commas): New function to format a long with commas. (cpu_print_info): Use it to print number_of_insns. * ppc-endian.c (SWAP_n): New macros to speed up byte swapping for 2, 4, and 8 bytes. (ENDIAN_N): If both target and host byte orders are known, don't bother testing CURRENT_{TARGET,HOST}_BYTE_ORDER. * ppc-endian.h (target specific H2T_n/T2H_n macros): Remove #if 0 to allow target specific H2T_n/T2H_n macros to be used. (htonl, ntohl): If compiled on a 486 by GCC and WITH_BSWAP is non-zero, redefine the htonl/ntohl macros to use the BSWAP instead of the 3 instruction sequence that runs on 386s. * std-config.h (WITH_{HOST,TARGET}_BYTE_ORDER): Don't override if specified on the compile line. (WITH_BSWAP): If not defined, define as 0. * Makefile.in (INLINE_CFLAGS): Add -DDEFAULT_INLINE=2 to add default inline support. Pass INLINE_CFLAGS when compiling. * devices.{h,c} (unimp_device_ioctl): Use STATIC_DEVICES, not INLINE_DEVICES since GCC doesn't like inline functions that accept variable arguments. (stack_ioctl_callback): Make function just static because GCC doesn't like inline functions that accept variable arguments. * devices.h (STATIC_DEVICES): Define as empty if not defined. * inline.c: Correct pathnames of included C files to match current implementation. * inline.h (STATIC_DEVICES): If DEVICES_INLINE is defined to be non-zero, define STATIC_DEVICES to be static. * std-config.h (INLINE): If GNU C and optimizing, define this as __inline__. (DEFAULT_INLINE): If not defined, define as 0. (ENDIAN_INLINE): If not defined, define as DEFAULT_INLINE. ({CORE,VM,CPU,EVENTS,REGISTERS,INTERRUPTS}_INLINE): Ditto. ({SPREG,IDECODE}_INLINE): Ditto. Wed Oct 11 17:13:15 1995 Andrew Cagney * ppc-instructions: Initial cut of floating point suport added. Of note include - use of host IEEE floating point instructions, use of PowerPC manual pseudo code to handle the FPSCR. It is not currently a pretty sight. * memory_map.h, memory_map.c, memory_map_n.h, core.h, core.c: merge into core.h, core.c, core_n.h. The type memory_map replaced with core_map. This removes a level of pointer indirection when translating an address. * memory_map.h, memory_map.c, memory_map_n.h: delete. * Makefile.in et.al (sorry): tweek to use new core, core_map and core.h. Wed Oct 11 12:10:26 1995 Andrew Cagney * sim_calls.c, main.c: Add -g (trace_gdb) option, add tracing to most of the other functions in sim_calls.c. * basics.h (CONCAT3), memory_map.c, memory_map_n.h, Makefile.in: Add macros to better cover up `generic' code. Makes it possible to step through the generic code! * vm.c, vm_n.h, Makefile.in: ditto Tue Oct 10 15:42:59 1995 Andrew Cagney * devices.h, devices.c, memory_map.h, memory_map.c: Changed callback interface so that there is a read/write buffer but no read/write_word. VEA default memory read/write handler sometimes couldn't resolve an access and of those some were for a memory fault and some were because gdb was making a bogus request. * devices.h, devices.c, memory_map.h, memory_map.c, vm.h, vm.c: eliminate transfer_mode (raw or cooked) parameter from read/write buffer. Fri Oct 6 20:23:56 1995 Andrew Cagney * ppc-instructions (fmul, fmuls): correct instruction format - had FRB instead of FRC. Wed Oct 4 17:31:12 1995 Andrew Cagney * psim.c, device_tree.h, device_tree.c, devices.c (printd_*, scand_*): new functions to parse/print fields in device names while hiding any machine dependency. * devices.c, psim.c: Change the stack init code so that it is handled by a device. Arguments passed across using a device ioctl (hack). * devices.h, devices.c: device ioctl callback changed to allow a variable number of arguments. This gives greater flexability and greater chance of bugs. Tue Oct 3 22:01:56 1995 Andrew Cagney * main.c (printf_filtered, error): Missing va_end() to close off variable argument use. * Makefile.in (tmp-gencode): comment out hack to get around some versions of make not handling files being created as side-effects. * gen.c (lf_open): Add -n (real_file_name) option. Specifies an alternative file name to use in output files for things like #line macros. Makefile.in (tmp-gencode): Use gen -n so that debug info is correct. * Makefile.in (TARGETLIB): Use this instead of libsim.a in the Makefile. Sat Oct 7 22:40:59 1995 Michael Meissner * sim_calls.c (sim_set_callbacks): Define new function. Fri Oct 6 17:23:10 1995 Michael Meissner * psim.c (psim_print_info): Print exit status or signal number. Mon Oct 2 11:46:37 1995 Michael Meissner * cpu.c (struct _cpu): Add number_of_insns field to trace how many instructions are executed. (cpu_increment_number_of_insns): New function to increment the number of instructions issued. (cpu_get_number_of_insns): New function to return the number of instructions issued. (cpu_print_info): New function to print cpu related information. At present, print the number of instructions executed. * gen_idecode_c: Emit call to cpu_increment_number_of_insns within idecode_issue. * psim.c (psim_print_info): New function to iterate over each of the CPU's calling cpu_print_info. * psim.h,cpu.h: Add new declarations. * sim_calls.c (sim_open): Add argument processing to add the same switches main.c accepts for the standalone processor. (sim_close): Call psim_print_info if -I. * main.c (main): Add comment saying to update sim_calls.c when adding switches. Add -I to call psim_print_info when done. (usage): Update usage message. Sun Oct 1 13:52:59 1995 Michael Meissner * main.c (printf_filtered): Correct to match new prototype. Sat Sep 30 20:47:05 1995 Michael Meissner * sim_callbacks.h (printf_filtered): Correct prototype. Thu Sep 21 16:26:49 1995 Michael Meissner * device_tree.c (OEA_MEMORY_SIZE): Define if not defined to 0x100000. (clayton_memory_size): Define as OEA_MEMORY_SIZE. * std-config.h (WITH_TRACE): Default to 1 now. * psim.c (write_stack_arguments): Don't write any stack arguments if OEA. * main.c (main): Switch to using getopt. Make -p also set trace_semantics. Make -a turn on all trace flags. Make -C turn on console tracing. * device_tree.c (create_option_device_node): Assume a program is OEA if the start address is < 4096, not just == 0. Wed Sep 20 13:36:06 1995 Ian Lance Taylor * Makefile.in (maintainer-clean): New synonym for realclean. Sun Sep 10 10:23:56 1995 Michael Tiemann * registers.c (register_description): Add gdb synonyms for cr (cnd) and msr (ps). Fri Sep 8 13:16:10 1995 Ian Lance Taylor * Makefile.in (install): Don't install in $(tooldir). * configure.in: Call AC_CONFIG_HEADER. Don't try to use bfd/hosts/*.h file or bfd/config/*.mh file. Call AC_PROG_CC and AC_PROG_RANLIB. Substitute in values for CFLAGS, HDEFINES, AR, and CC_FOR_BUILD. Call AC_CHECK_HEADERS for various header files. Touch stamp.h if creating config.h. * configure: Rebuild. * config.in: New file, created by autoheader. * Makefile.in (AR): Define as @AR@. (CC): New variable, defined as @CC@. (CFLAGS): Define as @CFLAGS@. (CC_FOR_BUILD): New variable, defined as @CC_FOR_BUILD@. (RANLIB): Define as @RANLIB@. (HDEFINES, TDEFINES): New variables. (@host_makefile_frag@): Remove. (mostlyclean): Make the same as clean, not distclean. (clean): Remove config.log. (distclean): Remove config.h and stamp-h. (Makefile): Don't depend upon @frags@. Just rebuild Makefile when invoking config.status. (config.h, stamp-h): New targets. (gen, gen.o): Build with CC_FOR_BUILD, not CC. (ppc-config.h): Rename from old config.h build. * (basics.h,gen.c,ppc-endian.c,psim.c): Include ppc-config.h. Fri Sep 8 09:51:03 1995 Michael Meissner * configure{,.in}: Don't include sysdep.h from bfd, since bfd no longer provides it. * basics.h (sysdep.h): Don't include it. * Makefile.in (BASICS_H): Remove sysdep.h. Wed Sep 6 13:25:42 1995 Andrew Cagney * core.c (core_add_data): First growth of bss was being put at wrong address (0) instead of &end. * core.c (core_add_stack, core_add_data): Was not handling case where bss/stack is grown across the current end-of-{bss,stack}. Wed Sep 6 00:46:10 1995 Andrew Cagney * system.c (system_call): Fix SYS_break - was aligning bss to a page boundary instead of just an 8 byte one; On first call sbrk(0) != sbrk(0). Thu Aug 24 14:48:54 1995 Michael Meissner * Makefile.in (install): Fix install rule. Tue Aug 22 09:31:18 1995 Michael Meissner * system.c (system_call): Add read support. * main.c (main): -t sets trace_device_tree. Correct usage message to current reality. * device_tree.c (update_memory_node_for_section): Make tracing output line up. If not code or readonly, assume that the section is a data section and has read/write permissions. Add readonly support. * core.c (create_core_from_addresses): Print end address in traces and make tracing output line up. * Makefile.in: Rewrite from Makefile to work with the Cygnus environment, and support compiling in a different directory than the sources reside in. * ppc-endian.h: Rename from endian.h so that it doesn't get confused with /usr/include/sys/endian.h on Linux. Add Linux endian support. * ppc-endian.c: Rename to be consistant with ppc-endian.h. Include ppc-endian.h, not endian.h. * basics.h (sysdep.h): Include sysdep.h that configure makes. Include ppc-endian.h, not endian.h. * std-config.h: Rename from ppc-config. Put #ifndefs around most configuration macros, so they can be overridden via CFLAGS. By default, turn off tracing. * configure.in: Clone from other simulator targets. * configure: Generate via autoconf from configure.in. Sat Aug 19 09:05:32 1995 Andrew Cagney * ppc-instructions: fix srawi (was geting XER[CA] real wrong). * interrupts.c (data_storage_interrupt): allow stack to grow by upto one MB per increment. * ppc-instructions: divw was computing rA / rA not rA / rB * main.c (main): really stupid. Wasn't exiting with correct status Fri Aug 18 00:38:01 1995 Andrew Cagney * system.c (system_call): add system calls kill(2) and getpid(2). * main.c (main): Check/return exit status when simulation finishes. Thu Aug 17 14:29:18 1995 Andrew Cagney * device_tree.c (create_option_device_node): Alignment rules (at least for the moment) now are for strict alignment only for LE OEA mode. (Because of compiler problems). * system.c (system_call) SYS_exit: Wasn't exiting with correct status. Thu Aug 17 01:16:38 1995 Andrew Cagney * vm.c (DEFINE_VM_DATA_MAP_WRITE_N): For miss aligned transfer forgot to return. * system.c (system_call): didn't page align break argument before determining increment break increment. * psim/ppc: Re-arange entire directory structure so that everything lives in the one directory. While a pain for cleaning, makes building across multiple architectures much simpler. * devices.c, device_tree.c: Added code that provides a simple illustration of how an interrupt control device could be implemented. * devices.c: Added code so that the dumb console device can read (from stdin) as well as write to stdout.