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rtems/bsps/sh/shsim/start/linkcmds
Sebastian Huber 511dc4b2be Rework initialization and interrupt stack support 
Statically initialize the interrupt stack area
(_Configuration_Interrupt_stack_area_begin,
_Configuration_Interrupt_stack_area_end, and
_Configuration_Interrupt_stack_size) via <rtems/confdefs.h>.  Place the
interrupt stack area in a special section ".rtemsstack.interrupt".  Let
BSPs define the optimal placement of this section in their linker
command files (e.g. in a fast on-chip memory).

This change makes makes the CPU_HAS_SOFTWARE_INTERRUPT_STACK and
CPU_HAS_HARDWARE_INTERRUPT_STACK CPU port defines superfluous, since the
low level initialization code has all information available via global
symbols.

This change makes the CPU_ALLOCATE_INTERRUPT_STACK CPU port define
superfluous, since the interrupt stacks are allocated by confdefs.h for
all architectures.  There is no need for BSP-specific linker command
file magic (except the section placement), see previous ARM linker
command file as a bad example.

Remove _CPU_Install_interrupt_stack().  Initialize the hardware
interrupt stack in _CPU_Initialize() if necessary (e.g.
m68k_install_interrupt_stack()).

The optional _CPU_Interrupt_stack_setup() is still useful to customize
the registration of the interrupt stack area in the per-CPU information.

The initialization stack can reuse the interrupt stack, since

  * interrupts are disabled during the sequential system initialization,
    and

  * the boot_card() function does not return.

This stack resuse saves memory.

Changes per architecture:

arm:

  * Mostly replace the linker symbol based configuration of stacks with
    the standard <rtems/confdefs.h> configuration via
    CONFIGURE_INTERRUPT_STACK_SIZE.  The size of the FIQ, ABT and UND
    mode stack is still defined via linker symbols.  These modes are
    rarely used in applications and the default values provided by the
    BSP should be sufficient in most cases.

  * Remove the bsp_processor_count linker symbol hack used for the SMP
    support. This is possible since the interrupt stack area is now
    allocated by the linker and not allocated from the heap.  This makes
    some configure.ac stuff obsolete.  Remove the now superfluous BSP
    variants altcycv_devkit_smp and realview_pbx_a9_qemu_smp.

bfin:

  * Remove unused magic linker command file allocation of initialization
    stack.  Maybe a previous linker command file copy and paste problem?
    In the start.S the initialization stack is set to a hard coded value.

lm32, m32c, mips, nios2, riscv, sh, v850:

  * Remove magic linker command file allocation of initialization stack.
    Reuse interrupt stack for initialization stack.

m68k:

  * Remove magic linker command file allocation of initialization stack.
    Reuse interrupt stack for initialization stack.

powerpc:

  * Remove magic linker command file allocation of initialization stack.
    Reuse interrupt stack for initialization stack.

  * Used dedicated memory region (REGION_RTEMSSTACK) for the interrupt
    stack on BSPs using the shared linkcmds.base (replacement for
    REGION_RWEXTRA).

sparc:

  * Remove the hard coded initialization stack.  Use the interrupt stack
    for the initialization stack on the boot processor.  This saves
    16KiB of RAM.

Update #3459.
2018-06-27 08:58:16 +02:00

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/*
* Memory layout for an SH 7032 with main memory in area 0
*
* NOTES:
* + All RAM/ROM areas are mapped onto area 0, because gdb's simulator
* is not able to simulate memory areas but area 0. Area 5 (on-chip
* peripherials) can not be mapped onto area 0 and will cause SIGILL
* exceptions.
* + Assumed to be compatible with other SH-cpu family members (eg. SH7045)
*
* Authors: Ralf Corsepius (corsepiu@faw.uni-ulm.de)
*
* COPYRIGHT (c) 2001, Ralf Corsepius, Ulm, Germany
*
* 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.
*/
OUTPUT_ARCH(sh)
ENTRY(_start)
STARTUP(start.o)
_RamBase = DEFINED(_RamBase) ? _RamBase : 0x00000000;
_RamSize = DEFINED(_RamSize) ? _RamSize : 16M;
_HeapSize = DEFINED(_HeapSize) ? _HeapSize : 0x0;
MEMORY
{
/* Real memory layout submitted
rom : o = 0x00000000, l = 128k
ram : o = 0x00040000, l = 256k
*/
/* Memory layout which links all tests */
rom : o = 0x01000000, l = 512k
ram : o = 0x00040000, l = 512k
onchip_peri : o = 0x05000000, l = 512
}
SECTIONS
{
/* boot vector table */
.monvects (NOLOAD) :
{
_monvects = . ;
} > rom
/* monitor play area */
.monram 0x00040000 (NOLOAD) :
{
_ramstart = .;
} > ram
/* monitor vector table */
.vects 0x00042000 (NOLOAD) : {
_vectab = . ;
*(.vects);
}
/* Read-only sections, merged into text segment: */
. = 0x00044000 ;
.interp : { *(.interp) }
.hash : { *(.hash) }
.dynsym : { *(.dynsym) }
.dynstr : { *(.dynstr) }
.gnu.version : { *(.gnu.version) }
.gnu.version_d : { *(.gnu.version_d) }
.gnu.version_r : { *(.gnu.version_r) }
.rela.dyn :
{
*(.rela.init)
*(.rela.text .rela.text.* .rela.gnu.linkonce.t.*)
*(.rela.fini)
*(.rela.rodata .rela.rodata.* .rela.gnu.linkonce.r.*)
*(.rela.data .rela.data.* .rela.gnu.linkonce.d.*)
*(.rela.tdata .rela.tdata.* .rela.gnu.linkonce.td.*)
*(.rela.tbss .rela.tbss.* .rela.gnu.linkonce.tb.*)
*(.rela.ctors)
*(.rela.dtors)
*(.rela.got)
*(.rela.sdata .rela.sdata.* .rela.gnu.linkonce.s.*)
*(.rela.sbss .rela.sbss.* .rela.gnu.linkonce.sb.*)
*(.rela.sdata2 .rela.sdata2.* .rela.gnu.linkonce.s2.*)
*(.rela.sbss2 .rela.sbss2.* .rela.gnu.linkonce.sb2.*)
*(.rela.bss .rela.bss.* .rela.gnu.linkonce.b.*)
} >ram
.rel.text :
{ *(.rel.text) *(.rel.gnu.linkonce.t*) }
.rel.data :
{ *(.rel.data) *(.rel.gnu.linkonce.d*) }
.rel.rodata :
{ *(.rel.rodata) *(.rel.gnu.linkonce.r*) }
.rel.got : { *(.rel.got) }
.rel.ctors : { *(.rel.ctors) }
.rel.dtors : { *(.rel.dtors) }
.rel.init : { *(.rel.init) }
.rel.fini : { *(.rel.fini) }
.rel.bss : { *(.rel.bss) }
.rel.plt : { *(.rel.plt) }
.plt : { *(.plt) }
.text . :
{
_start = .;
*(.text*)
*(.stub)
/*
* Special FreeBSD sysctl sections.
*/
. = ALIGN (16);
___start_set_sysctl_set = .;
*(set_sysc*); /* set_sysctl_* but name is truncated by SH-coff */
___stop_set_sysctl_set = ABSOLUTE(.);
*(set_doma*); /* set_domain_* but name is truncated by SH-coff */
*(set_pseu*); /* set_pseudo_* but name is truncated by SH-coff */
/* .gnu.warning sections are handled specially by elf32.em. */
*(.gnu.warning)
*(.gnu.linkonce.t*)
} > ram
.init :
{
KEEP (*(.init))
} >ram
.fini :
{
KEEP (*(.fini))
} >ram
_etext = .;
PROVIDE (etext = .);
.rodata . : { *(.rodata*) .rodata.* *(.gnu.linkonce.r*) } > ram
.rodata1 . : { *(.rodata1) } > ram
.tdata : {
__TLS_Data_begin = .;
*(.tdata .tdata.* .gnu.linkonce.td.*)
__TLS_Data_end = .;
} > ram
.tbss : {
__TLS_BSS_begin = .;
*(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon)
__TLS_BSS_end = .;
} > ram
.init . : { KEEP(*(.init)) } > ram =0
.fini . : { KEEP(*(.fini)) } > ram =0
.ctors . : { KEEP(*(.ctors)) } > ram =0
.dtors . : { KEEP(*(.dtors)) } > ram =0
__TLS_Data_size = __TLS_Data_end - __TLS_Data_begin;
__TLS_Data_begin = __TLS_Data_size != 0 ? __TLS_Data_begin : __TLS_BSS_begin;
__TLS_Data_end = __TLS_Data_size != 0 ? __TLS_Data_end : __TLS_BSS_begin;
__TLS_BSS_size = __TLS_BSS_end - __TLS_BSS_begin;
__TLS_Size = __TLS_BSS_end - __TLS_Data_begin;
__TLS_Alignment = MAX (ALIGNOF (.tdata), ALIGNOF (.tbss));
/* Adjust the address for the data segment. We want to adjust up to
the same address within the page on the next page up. */
. = ALIGN(128) + (. & (128 - 1));
.data . :
{
*(.data*)
*(.gcc_exc*)
___EH_FRAME_BEGIN__ = .;
*(.eh_fram*)
___EH_FRAME_END__ = .;
LONG(0);
*(.gcc_except_table*)
*(.gnu.linkonce.d*)
CONSTRUCTORS
} > ram
.data1 . : { *(.data1) }
.rtemsroset : {
/* for pre rtems-libbsd FreeBSD code */
__start_set_sysctl_set = .;
*(set_sysctl_*);
__stop_set_sysctl_set = .;
*(set_domain_*);
*(set_pseudo_*);
KEEP (*(SORT(.rtemsroset.*)))
} >ram
.rtemsrwset : {
KEEP (*(SORT(.rtemsrwset.*)))
} >ram
.got . : { *(.got.plt) *(.got) }
.dynamic . : { *(.dynamic) }
/* We want the small data sections together, so single-instruction offsets
can access them all, and initialized data all before uninitialized, so
we can shorten the on-disk segment size. */
.sdata . : { *(.sdata) }
_edata = .;
PROVIDE (edata = .);
__bss_start = .;
.sbss . : { *(.sbss*) *(.scommon) }
.bss . :
{
*(.dynbss)
*(.bss .bss* .gnu.linkonce.b*)
*(COMMON)
} > ram
_end = . ;
PROVIDE (end = .);
.rtemsstack (NOLOAD) : {
*(SORT(.rtemsstack.*))
} > ram
_WorkAreaBase = . ;
/* Stabs debugging sections. */
.stab 0 : { *(.stab) }
.stabstr 0 : { *(.stabstr) }
.stab.excl 0 : { *(.stab.excl) }
.stab.exclstr 0 : { *(.stab.exclstr) }
.stab.index 0 : { *(.stab.index) }
.stab.indexstr 0 : { *(.stab.indexstr) }
.comment 0 : { *(.comment) }
/* 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) }
/* These must appear regardless of . */
}
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