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Re: Patch to allow programs run from kernel segment 0 on MIPS
- To: Michael Meissner <meissner at redhat dot com>
- Subject: Re: Patch to allow programs run from kernel segment 0 on MIPS
- From: "J. Johnston" <jjohnstn at cygnus dot com>
- Date: Wed, 17 Oct 2001 13:10:22 -0400
- CC: newlib at sources dot redhat dot com
- Organization: Red Hat Inc.
- References: <200110152231.f9FMV3V07609@tiktok.cygnus.com>
Michael Meissner wrote:
>
> The following patch adds a new linker script to run programs in kernel
> segment 0 (which can be cached) as opposed to kernel segment 1 which
> is always uncached. The ROM monitor I'm dealing with also doesn't
> like memory sizing from kernel segment 0, so I added code to always
> use kernel segment 1 for sizing memory if the program was linked for
> kernel segment 0 (kernel segment 0 and 1 both address the same memory,
> so it is safe to do this always). I did test it, doing a build, and
> downloading a program into kernel segment 0, and ran it. Is it ok to
> apply the patches?
>
Yes, please go ahead. You probably should change the copyright to Red Hat
instead of Cygnus Support since you are updating it anyway.
-- Jeff J.
> 2001-10-15 Michael Meissner <meissner@redhat.com>
>
> * regs.S (K0BASE_ADDR,K1BASE_ADDR): Define as addresses to
> identify if a program is running in kernel segment 0.
>
> * cma101.c (__sizemem): If we are running in kernel segment 0,
> instead of kernel segment 1, use kernel segment 0 addresses which
> are uncached when sizing memory.
>
> * ddb-kseg0.ld: New file, clone of ddb.ld, except it links the
> program to run in kernel segment 0, instead of kernel segment 1.
>
> * configure.in: Treat ddb-kseg0.ld like ddb.ld.
> * configure: Regenerate.
>
> *** libgloss/mips/regs.S.~1~ Fri Mar 17 17:48:51 2000
> --- libgloss/mips/regs.S Mon Oct 15 16:15:20 2001
> ***************
> *** 56,63 ****
> --- 56,67 ----
> #define K0BASE 0x80000000
> #ifndef __mips64
> #define K1BASE 0xA0000000
> + #define K0BASE_ADDR ((char *)K0BASE)
> + #define K1BASE_ADDR ((char *)K1BASE)
> #else
> #define K1BASE 0xFFFFFFFFA0000000LL
> + #define K0BASE_ADDR ((char *)0xFFFFFFFF80000000LL)
> + #define K1BASE_ADDR ((char *)K1BASE)
> #endif
>
> #define PHYS_TO_K1(a) ((unsigned)(a) | K1BASE)
> *** libgloss/mips/cma101.c.~1~ Fri Mar 17 17:48:51 2000
> --- libgloss/mips/cma101.c Mon Oct 15 17:21:11 2001
> ***************
> *** 1,7 ****
> /*
> * cma101.c -- lo-level support for Cogent CMA101 development board.
> *
> ! * Copyright (c) 1996 Cygnus Support
> *
> * The authors hereby grant permission to use, copy, modify, distribute,
> * and license this software and its documentation for any purpose, provided
> --- 1,7 ----
> /*
> * cma101.c -- lo-level support for Cogent CMA101 development board.
> *
> ! * Copyright (c) 1996, 2001 Cygnus Support
> *
> * The authors hereby grant permission to use, copy, modify, distribute,
> * and license this software and its documentation for any purpose, provided
> *************** __sizemem ()
> *** 187,194 ****
> --- 187,200 ----
> unsigned int baseorig;
> unsigned int sr;
> extern void *end;
> + char *endptr = (char *)&end;
> int extra;
>
> + /* If we are running in kernel segment 0 (possibly cached), try sizing memory
> + in kernel segment 1 (uncached) to avoid some problems with monitors. */
> + if (endptr >= K0BASE_ADDR && endptr < K1BASE_ADDR)
> + endptr = (endptr - K0BASE_ADDR) + K1BASE_ADDR;
> +
> INTDISABLE(sr,baseorig); /* disable all interrupt masks */
>
> __default_buserr_handler();
> *************** __sizemem ()
> *** 200,207 ****
> for an int pointer, so we adjust the address to make sure it is safe.
> We use void * arithmetic to avoid accidentally truncating the pointer. */
>
> ! extra = ((int) &end & (sizeof (int) - 1));
> ! base = ((void *) &end + sizeof (int) - extra);
> baseorig = *base;
>
> *base = SM_PATTERN;
> --- 206,213 ----
> for an int pointer, so we adjust the address to make sure it is safe.
> We use void * arithmetic to avoid accidentally truncating the pointer. */
>
> ! extra = ((int) endptr & (sizeof (int) - 1));
> ! base = ((void *) endptr + sizeof (int) - extra);
> baseorig = *base;
>
> *base = SM_PATTERN;
> *** libgloss/mips/ddb-kseg0.ld.~1~ Mon Oct 15 18:18:51 2001
> --- libgloss/mips/ddb-kseg0.ld Mon Oct 15 16:16:46 2001
> ***************
> *** 0 ****
> --- 1,154 ----
> + /* The following TEXT start address leaves space for the monitor
> + workspace. */
> +
> + ENTRY(_start)
> + OUTPUT_FORMAT("elf32-bigmips", "elf32-bigmips", "elf32-littlemips")
> + GROUP(-lc -lpmon -lgcc)
> + SEARCH_DIR(.)
> + __DYNAMIC = 0;
> +
> + /*
> + * Allocate the stack to be at the top of memory, since the stack
> + * grows down
> + */
> + PROVIDE (__stack = 0);
> + /* PROVIDE (__global = 0); */
> +
> + /*
> + * Initalize some symbols to be zero so we can reference them in the
> + * crt0 without core dumping. These functions are all optional, but
> + * we do this so we can have our crt0 always use them if they exist.
> + * This is so BSPs work better when using the crt0 installed with gcc.
> + * We have to initalize them twice, so we multiple object file
> + * formats, as some prepend an underscore.
> + */
> + PROVIDE (hardware_init_hook = 0);
> + PROVIDE (software_init_hook = 0);
> +
> + SECTIONS
> + {
> + . = 0x80100000;
> + .text : {
> + _ftext = . ;
> + *(.init)
> + eprol = .;
> + *(.text)
> + *(.text.*)
> + *(.gnu.linkonce.t*)
> + *(.mips16.fn.*)
> + *(.mips16.call.*)
> + PROVIDE (__runtime_reloc_start = .);
> + *(.rel.sdata)
> + PROVIDE (__runtime_reloc_stop = .);
> + *(.fini)
> + etext = .;
> + _etext = .;
> + }
> +
> + .ctors :
> + {
> + /* gcc uses crtbegin.o to find the start of
> + the constructors, so we make sure it is
> + first. Because this is a wildcard, it
> + doesn't matter if the user does not
> + actually link against crtbegin.o; the
> + linker won't look for a file to match a
> + wildcard. The wildcard also means that it
> + doesn't matter which directory crtbegin.o
> + is in. */
> +
> + KEEP (*crtbegin.o(.ctors))
> +
> + /* We don't want to include the .ctor section from
> + from the crtend.o file until after the sorted ctors.
> + The .ctor section from the crtend file contains the
> + end of ctors marker and it must be last */
> +
> + KEEP (*(EXCLUDE_FILE (*crtend.o) .ctors))
> + KEEP (*(SORT(.ctors.*)))
> + KEEP (*(.ctors))
> + }
> +
> + .dtors :
> + {
> + KEEP (*crtbegin.o(.dtors))
> + KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors))
> + KEEP (*(SORT(.dtors.*)))
> + KEEP (*(.dtors))
> + }
> +
> + . = .;
> + .rdata : {
> + *(.rdata)
> + *(.rodata)
> + *(.rodata.*)
> + *(.gnu.linkonce.r*)
> + }
> + _fdata = ALIGN(16);
> + .data : {
> + *(.data)
> + *(.data.*)
> + *(.gnu.linkonce.d*)
> + }
> + . = ALIGN(8);
> + _gp = . + 0x8000;
> + __global = _gp;
> + .lit8 : {
> + *(.lit8)
> + }
> + .lit4 : {
> + *(.lit4)
> + }
> + .sdata : {
> + *(.sdata)
> + *(.sdata.*)
> + *(.gnu.linkonce.s*)
> + }
> + . = ALIGN(4);
> + edata = .;
> + _edata = .;
> + _fbss = .;
> + .sbss : {
> + *(.sbss)
> + *(.scommon)
> + }
> + .bss : {
> + _bss_start = . ;
> + *(.bss)
> + *(COMMON)
> + }
> +
> + end = .;
> + _end = .;
> +
> + /* DWARF debug sections.
> + Symbols in the DWARF debugging sections are relative to
> + the beginning of the section so we begin them at 0. */
> +
> + /* DWARF 1 */
> + .debug 0 : { *(.debug) }
> + .line 0 : { *(.line) }
> +
> + /* GNU DWARF 1 extensions */
> + .debug_srcinfo 0 : { *(.debug_srcinfo) }
> + .debug_sfnames 0 : { *(.debug_sfnames) }
> +
> + /* DWARF 1.1 and DWARF 2 */
> + .debug_aranges 0 : { *(.debug_aranges) }
> + .debug_pubnames 0 : { *(.debug_pubnames) }
> +
> + /* DWARF 2 */
> + .debug_info 0 : { *(.debug_info) }
> + .debug_abbrev 0 : { *(.debug_abbrev) }
> + .debug_line 0 : { *(.debug_line) }
> + .debug_frame 0 : { *(.debug_frame) }
> + .debug_str 0 : { *(.debug_str) }
> + .debug_loc 0 : { *(.debug_loc) }
> + .debug_macinfo 0 : { *(.debug_macinfo) }
> +
> + /* SGI/MIPS DWARF 2 extensions */
> + .debug_weaknames 0 : { *(.debug_weaknames) }
> + .debug_funcnames 0 : { *(.debug_funcnames) }
> + .debug_typenames 0 : { *(.debug_typenames) }
> + .debug_varnames 0 : { *(.debug_varnames) }
> + }
> *** libgloss/mips/configure.in.~1~ Mon Oct 15 15:40:24 2001
> --- libgloss/mips/configure.in Mon Oct 15 16:02:27 2001
> *************** case "${target}" in
> *** 101,107 ****
> mips64vr5*-*-*)
> part_specific_obj="vr5xxx.o cma101.o"
> part_specific_defines=-DR5000
> ! script_list="idt pmon ddb lsi idtecoff nullmon"
> bsp_list="libidt.a libpmon.a liblsi.a libnullmon.a"
> ;;
> mipsisa32*-*-*)
> --- 101,107 ----
> mips64vr5*-*-*)
> part_specific_obj="vr5xxx.o cma101.o"
> part_specific_defines=-DR5000
> ! script_list="idt pmon ddb ddb-kseg0 lsi idtecoff nullmon"
> bsp_list="libidt.a libpmon.a liblsi.a libnullmon.a"
> ;;
> mipsisa32*-*-*)
> *************** case "${target}" in
> *** 113,119 ****
> *)
> part_specific_obj="vr4300.o cma101.o"
> part_specific_defines=
> ! script_list="idt pmon ddb lsi idtecoff nullmon"
> bsp_list="libidt.a libpmon.a liblsi.a libnullmon.a"
> ;;
> esac
> --- 113,119 ----
> *)
> part_specific_obj="vr4300.o cma101.o"
> part_specific_defines=
> ! script_list="idt pmon ddb ddb-kseg0 lsi idtecoff nullmon"
> bsp_list="libidt.a libpmon.a liblsi.a libnullmon.a"
> ;;
> esac
> *** libgloss/mips/configure.~1~ Mon Oct 15 18:19:11 2001
> --- libgloss/mips/configure Mon Oct 15 18:19:29 2001
> *************** program_suffix=NONE
> *** 28,33 ****
> --- 28,34 ----
> program_transform_name=s,x,x,
> silent=
> site=
> + sitefile=
> srcdir=
> target=NONE
> verbose=
> *************** Configuration:
> *** 142,147 ****
> --- 143,149 ----
> --help print this message
> --no-create do not create output files
> --quiet, --silent do not print \`checking...' messages
> + --site-file=FILE use FILE as the site file
> --version print the version of autoconf that created configure
> Directory and file names:
> --prefix=PREFIX install architecture-independent files in PREFIX
> *************** EOF
> *** 312,317 ****
> --- 314,324 ----
> -site=* | --site=* | --sit=*)
> site="$ac_optarg" ;;
>
> + -site-file | --site-file | --site-fil | --site-fi | --site-f)
> + ac_prev=sitefile ;;
> + -site-file=* | --site-file=* | --site-fil=* | --site-fi=* | --site-f=*)
> + sitefile="$ac_optarg" ;;
> +
> -srcdir | --srcdir | --srcdi | --srcd | --src | --sr)
> ac_prev=srcdir ;;
> -srcdir=* | --srcdir=* | --srcdi=* | --srcd=* | --src=* | --sr=*)
> *************** fi
> *** 477,488 ****
> srcdir=`echo "${srcdir}" | sed 's%\([^/]\)/*$%\1%'`
>
> # Prefer explicitly selected file to automatically selected ones.
> ! if test -z "$CONFIG_SITE"; then
> ! if test "x$prefix" != xNONE; then
> ! CONFIG_SITE="$prefix/share/config.site $prefix/etc/config.site"
> ! else
> ! CONFIG_SITE="$ac_default_prefix/share/config.site $ac_default_prefix/etc/config.site"
> fi
> fi
> for ac_site_file in $CONFIG_SITE; do
> if test -r "$ac_site_file"; then
> --- 484,499 ----
> srcdir=`echo "${srcdir}" | sed 's%\([^/]\)/*$%\1%'`
>
> # Prefer explicitly selected file to automatically selected ones.
> ! if test -z "$sitefile"; then
> ! if test -z "$CONFIG_SITE"; then
> ! if test "x$prefix" != xNONE; then
> ! CONFIG_SITE="$prefix/share/config.site $prefix/etc/config.site"
> ! else
> ! CONFIG_SITE="$ac_default_prefix/share/config.site $ac_default_prefix/etc/config.site"
> ! fi
> fi
> + else
> + CONFIG_SITE="$sitefile"
> fi
> for ac_site_file in $CONFIG_SITE; do
> if test -r "$ac_site_file"; then
> *************** else { echo "configure: error: can not r
> *** 583,589 ****
> fi
>
> echo $ac_n "checking host system type""... $ac_c" 1>&6
> ! echo "configure:587: checking host system type" >&5
>
> host_alias=$host
> case "$host_alias" in
> --- 594,600 ----
> fi
>
> echo $ac_n "checking host system type""... $ac_c" 1>&6
> ! echo "configure:598: checking host system type" >&5
>
> host_alias=$host
> case "$host_alias" in
> *************** host_os=`echo $host | sed 's/^\([^-]*\)-
> *** 604,610 ****
> echo "$ac_t""$host" 1>&6
>
> echo $ac_n "checking target system type""... $ac_c" 1>&6
> ! echo "configure:608: checking target system type" >&5
>
> target_alias=$target
> case "$target_alias" in
> --- 615,621 ----
> echo "$ac_t""$host" 1>&6
>
> echo $ac_n "checking target system type""... $ac_c" 1>&6
> ! echo "configure:619: checking target system type" >&5
>
> target_alias=$target
> case "$target_alias" in
> *************** target_os=`echo $target | sed 's/^\([^-]
> *** 622,628 ****
> echo "$ac_t""$target" 1>&6
>
> echo $ac_n "checking build system type""... $ac_c" 1>&6
> ! echo "configure:626: checking build system type" >&5
>
> build_alias=$build
> case "$build_alias" in
> --- 633,639 ----
> echo "$ac_t""$target" 1>&6
>
> echo $ac_n "checking build system type""... $ac_c" 1>&6
> ! echo "configure:637: checking build system type" >&5
>
> build_alias=$build
> case "$build_alias" in
> *************** test "$program_transform_name" = "" && p
> *** 676,682 ****
> # SVR4 /usr/ucb/install, which tries to use the nonexistent group "staff"
> # ./install, which can be erroneously created by make from ./install.sh.
> echo $ac_n "checking for a BSD compatible install""... $ac_c" 1>&6
> ! echo "configure:680: checking for a BSD compatible install" >&5
> if test -z "$INSTALL"; then
> if eval "test \"`echo '$''{'ac_cv_path_install'+set}'`\" = set"; then
> echo $ac_n "(cached) $ac_c" 1>&6
> --- 687,693 ----
> # SVR4 /usr/ucb/install, which tries to use the nonexistent group "staff"
> # ./install, which can be erroneously created by make from ./install.sh.
> echo $ac_n "checking for a BSD compatible install""... $ac_c" 1>&6
> ! echo "configure:691: checking for a BSD compatible install" >&5
> if test -z "$INSTALL"; then
> if eval "test \"`echo '$''{'ac_cv_path_install'+set}'`\" = set"; then
> echo $ac_n "(cached) $ac_c" 1>&6
> *************** test -z "$INSTALL_DATA" && INSTALL_DATA=
> *** 740,746 ****
> # Extract the first word of "gcc", so it can be a program name with args.
> set dummy gcc; ac_word=$2
> echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
> ! echo "configure:744: checking for $ac_word" >&5
> if eval "test \"`echo '$''{'ac_cv_prog_CC'+set}'`\" = set"; then
> echo $ac_n "(cached) $ac_c" 1>&6
> else
> --- 751,757 ----
> # Extract the first word of "gcc", so it can be a program name with args.
> set dummy gcc; ac_word=$2
> echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
> ! echo "configure:755: checking for $ac_word" >&5
> if eval "test \"`echo '$''{'ac_cv_prog_CC'+set}'`\" = set"; then
> echo $ac_n "(cached) $ac_c" 1>&6
> else
> *************** if test -z "$CC"; then
> *** 770,776 ****
> # Extract the first word of "cc", so it can be a program name with args.
> set dummy cc; ac_word=$2
> echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
> ! echo "configure:774: checking for $ac_word" >&5
> if eval "test \"`echo '$''{'ac_cv_prog_CC'+set}'`\" = set"; then
> echo $ac_n "(cached) $ac_c" 1>&6
> else
> --- 781,787 ----
> # Extract the first word of "cc", so it can be a program name with args.
> set dummy cc; ac_word=$2
> echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
> ! echo "configure:785: checking for $ac_word" >&5
> if eval "test \"`echo '$''{'ac_cv_prog_CC'+set}'`\" = set"; then
> echo $ac_n "(cached) $ac_c" 1>&6
> else
> *************** fi
> *** 819,825 ****
> fi
>
> echo $ac_n "checking whether we are using GNU C""... $ac_c" 1>&6
> ! echo "configure:823: checking whether we are using GNU C" >&5
> if eval "test \"`echo '$''{'ac_cv_prog_gcc'+set}'`\" = set"; then
> echo $ac_n "(cached) $ac_c" 1>&6
> else
> --- 830,836 ----
> fi
>
> echo $ac_n "checking whether we are using GNU C""... $ac_c" 1>&6
> ! echo "configure:834: checking whether we are using GNU C" >&5
> if eval "test \"`echo '$''{'ac_cv_prog_gcc'+set}'`\" = set"; then
> echo $ac_n "(cached) $ac_c" 1>&6
> else
> *************** else
> *** 828,834 ****
> yes;
> #endif
> EOF
> ! if { ac_try='${CC-cc} -E conftest.c'; { (eval echo configure:832: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; } | egrep yes >/dev/null 2>&1; then
> ac_cv_prog_gcc=yes
> else
> ac_cv_prog_gcc=no
> --- 839,845 ----
> yes;
> #endif
> EOF
> ! if { ac_try='${CC-cc} -E conftest.c'; { (eval echo configure:843: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; } | egrep yes >/dev/null 2>&1; then
> ac_cv_prog_gcc=yes
> else
> ac_cv_prog_gcc=no
> *************** if test $ac_cv_prog_gcc = yes; then
> *** 843,849 ****
> ac_save_CFLAGS="$CFLAGS"
> CFLAGS=
> echo $ac_n "checking whether ${CC-cc} accepts -g""... $ac_c" 1>&6
> ! echo "configure:847: checking whether ${CC-cc} accepts -g" >&5
> if eval "test \"`echo '$''{'ac_cv_prog_cc_g'+set}'`\" = set"; then
> echo $ac_n "(cached) $ac_c" 1>&6
> else
> --- 854,860 ----
> ac_save_CFLAGS="$CFLAGS"
> CFLAGS=
> echo $ac_n "checking whether ${CC-cc} accepts -g""... $ac_c" 1>&6
> ! echo "configure:858: checking whether ${CC-cc} accepts -g" >&5
> if eval "test \"`echo '$''{'ac_cv_prog_cc_g'+set}'`\" = set"; then
> echo $ac_n "(cached) $ac_c" 1>&6
> else
> *************** LD=${LD-ld}
> *** 879,885 ****
> # Extract the first word of "ranlib", so it can be a program name with args.
> set dummy ranlib; ac_word=$2
> echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
> ! echo "configure:883: checking for $ac_word" >&5
> if eval "test \"`echo '$''{'ac_cv_prog_RANLIB'+set}'`\" = set"; then
> echo $ac_n "(cached) $ac_c" 1>&6
> else
> --- 890,896 ----
> # Extract the first word of "ranlib", so it can be a program name with args.
> set dummy ranlib; ac_word=$2
> echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
> ! echo "configure:894: checking for $ac_word" >&5
> if eval "test \"`echo '$''{'ac_cv_prog_RANLIB'+set}'`\" = set"; then
> echo $ac_n "(cached) $ac_c" 1>&6
> else
> *************** case "${target}" in
> *** 926,932 ****
> mips64vr5*-*-*)
> part_specific_obj="vr5xxx.o cma101.o"
> part_specific_defines=-DR5000
> ! script_list="idt pmon ddb lsi idtecoff nullmon"
> bsp_list="libidt.a libpmon.a liblsi.a libnullmon.a"
> ;;
> mipsisa32*-*-*)
> --- 937,943 ----
> mips64vr5*-*-*)
> part_specific_obj="vr5xxx.o cma101.o"
> part_specific_defines=-DR5000
> ! script_list="idt pmon ddb ddb-kseg0 lsi idtecoff nullmon"
> bsp_list="libidt.a libpmon.a liblsi.a libnullmon.a"
> ;;
> mipsisa32*-*-*)
> *************** case "${target}" in
> *** 938,944 ****
> *)
> part_specific_obj="vr4300.o cma101.o"
> part_specific_defines=
> ! script_list="idt pmon ddb lsi idtecoff nullmon"
> bsp_list="libidt.a libpmon.a liblsi.a libnullmon.a"
> ;;
> esac
> --- 949,955 ----
> *)
> part_specific_obj="vr4300.o cma101.o"
> part_specific_defines=
> ! script_list="idt pmon ddb ddb-kseg0 lsi idtecoff nullmon"
> bsp_list="libidt.a libpmon.a liblsi.a libnullmon.a"
> ;;
> esac
>
> --
> Michael Meissner, Red Hat, Inc. (GCC group)
> PMB 198, 174 Littleton Road #3, Westford, Massachusetts 01886, USA
> Work: meissner@redhat.com phone: +1 978-486-9304
> Non-work: meissner@spectacle-pond.org fax: +1 978-692-4482