262 lines
7.1 KiB
Plaintext
262 lines
7.1 KiB
Plaintext
/*
|
|
* The MEMORY command describes the location and size of blocks of memory
|
|
* in the target. You can use it to describe which memory regions may be
|
|
* used by the linker, and which memory regions it must avoid.
|
|
*/
|
|
MEMORY
|
|
{
|
|
/*
|
|
* Memory with CPU cache.
|
|
*6M CPU SRAM
|
|
*/
|
|
ram (wxa!ri) : ORIGIN = 0x80000000, LENGTH = (6 * 1024 * 1024)
|
|
/*
|
|
* Memory without CPU cache
|
|
* 6M CPU SRAM
|
|
*/
|
|
ram_nocache (wxa!ri) : ORIGIN = 0x40000000, LENGTH = (6 * 1024 * 1024)
|
|
}
|
|
|
|
PROVIDE( _rom_start = ORIGIN(rom) );
|
|
PROVIDE( _rom_end = ORIGIN(rom) + LENGTH(rom) );
|
|
PROVIDE( _ram_start = ORIGIN(ram) );
|
|
PROVIDE( _ram_end = ORIGIN(ram) + LENGTH(ram) );
|
|
PROVIDE( _io_start = 0x40000000 );
|
|
PROVIDE( _io_end = _io_start + LENGTH(ram) );
|
|
PROVIDE( _stack_size = 1 << 15 );
|
|
|
|
|
|
/*
|
|
* The OUTPUT_ARCH command specifies the machine architecture where the
|
|
* argument is one of the names used in the Kendryte library.
|
|
*/
|
|
OUTPUT_ARCH( "riscv" )
|
|
|
|
/*
|
|
* The ENTRY command specifies the entry point (ie. first instruction to
|
|
* execute). The symbol _start is defined in crt0.S
|
|
*/
|
|
ENTRY(_start)
|
|
|
|
/*
|
|
* The GROUP command is special since the listed archives will be
|
|
* searched repeatedly until there are no new undefined references. We
|
|
* need this since -lc depends on -lgloss and -lgloss depends on -lc. I
|
|
* thought gcc would automatically include -lgcc when needed, but
|
|
* in this file includes it explicitly here and I was seeing link errors
|
|
* without it.
|
|
*/
|
|
/* GROUP( -lc -lgloss -lgcc ) */
|
|
|
|
/*
|
|
* The linker only pays attention to the PHDRS command when generating
|
|
* an ELF output file. In other cases, the linker will simply ignore PHDRS.
|
|
*/
|
|
PHDRS
|
|
{
|
|
ram_ro PT_LOAD;
|
|
ram_init PT_LOAD;
|
|
ram PT_NULL;
|
|
}
|
|
|
|
/*
|
|
* This is where we specify how the input sections map to output
|
|
* sections.
|
|
*/
|
|
SECTIONS
|
|
{
|
|
/* Program code segment, also known as a text segment */
|
|
.text :
|
|
{
|
|
PROVIDE( _text = ABSOLUTE(.) );
|
|
/* Initialization code segment */
|
|
KEEP( *(.text.start) )
|
|
*(.text.unlikely .text.unlikely.*)
|
|
*(.text.startup .text.startup.*)
|
|
/* Normal code segment */
|
|
*(.text .text.*)
|
|
*(.gnu.linkonce.t.*)
|
|
|
|
. = ALIGN(8);
|
|
PROVIDE( _etext = ABSOLUTE(.) );
|
|
} >ram AT>ram :ram_ro
|
|
|
|
/* Read-only data segment */
|
|
.rodata :
|
|
{
|
|
*(.rdata)
|
|
*(.rodata .rodata.*)
|
|
*(.gnu.linkonce.r.*)
|
|
} >ram AT>ram :ram_ro
|
|
|
|
. = ALIGN(8);
|
|
|
|
/* Exception handling */
|
|
.eh_frame :
|
|
{
|
|
KEEP (*(.eh_frame)) *(.eh_frame.*)
|
|
. = ALIGN(8);
|
|
} >ram AT>ram :ram_ro
|
|
.gnu_extab : { *(.gnu_extab) } >ram AT>ram :ram_ro
|
|
.gcc_except_table : { *(.gcc_except_table .gcc_except_table.*) } >ram AT>ram :ram_ro
|
|
.exception_ranges : { *(.exception_ranges .exception_ranges*) } >ram AT>ram :ram_ro
|
|
|
|
/* Init array and fini array */
|
|
.preinit_array :
|
|
{
|
|
PROVIDE_HIDDEN (__preinit_array_start = .);
|
|
KEEP (*(.preinit_array))
|
|
PROVIDE_HIDDEN (__preinit_array_end = .);
|
|
} >ram AT>ram :ram_ro
|
|
|
|
.init_array :
|
|
{
|
|
PROVIDE_HIDDEN (__init_array_start = .);
|
|
KEEP (*(SORT_BY_INIT_PRIORITY(.init_array.*) SORT_BY_INIT_PRIORITY(.ctors.*)))
|
|
KEEP (*(.init_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .ctors))
|
|
PROVIDE_HIDDEN (__init_array_end = .);
|
|
} >ram AT>ram :ram_ro
|
|
|
|
.fini_array :
|
|
{
|
|
PROVIDE_HIDDEN (__fini_array_start = .);
|
|
KEEP (*(SORT_BY_INIT_PRIORITY(.fini_array.*) SORT_BY_INIT_PRIORITY(.dtors.*)))
|
|
KEEP (*(.fini_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .dtors))
|
|
PROVIDE_HIDDEN (__fini_array_end = .);
|
|
} >ram AT>ram :ram_ro
|
|
|
|
.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))
|
|
KEEP (*crtbegin?.o(.ctors))
|
|
/* We don't want to include the .ctor section 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 *crtend?.o ) .ctors))
|
|
KEEP (*(SORT(.ctors.*)))
|
|
KEEP (*(.ctors))
|
|
} >ram AT>ram :ram_ro
|
|
|
|
.dtors :
|
|
{
|
|
KEEP (*crtbegin.o(.dtors))
|
|
KEEP (*crtbegin?.o(.dtors))
|
|
KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .dtors))
|
|
KEEP (*(SORT(.dtors.*)))
|
|
KEEP (*(.dtors))
|
|
} >ram AT>ram :ram_ro
|
|
|
|
. = ALIGN(8);
|
|
|
|
.lalign :
|
|
{
|
|
. = ALIGN(8);
|
|
PROVIDE( _data_lma = . );
|
|
} >ram AT>ram :ram_ro
|
|
|
|
.dalign :
|
|
{
|
|
. = ALIGN(8);
|
|
PROVIDE( _data = . );
|
|
} >ram AT>ram :ram_init
|
|
|
|
. = ALIGN(8);
|
|
|
|
/* .data, .sdata and .srodata segment */
|
|
.data :
|
|
{
|
|
/* Writable data segment (.data segment) */
|
|
*(.data .data.*)
|
|
*(.gnu.linkonce.d.*)
|
|
/* Have _gp point to middle of sdata/sbss to maximize displacement range */
|
|
. = ALIGN(8);
|
|
PROVIDE( __global_pointer$ = ABSOLUTE(.) + 0x800);
|
|
/* Writable small data segment (.sdata segment) */
|
|
*(.sdata .sdata.*)
|
|
*(.gnu.linkonce.s.*)
|
|
/* Read-only small data segment (.srodata segment) */
|
|
. = ALIGN(8);
|
|
*(.srodata.cst16)
|
|
*(.srodata.cst8)
|
|
*(.srodata.cst4)
|
|
*(.srodata.cst2)
|
|
*(.srodata .srodata.*)
|
|
/* Align _edata to cache line size */
|
|
. = ALIGN(64);
|
|
PROVIDE( _edata = ABSOLUTE(.) );
|
|
} >ram AT>ram :ram_init
|
|
|
|
/* .bss and .sbss segment */
|
|
.bss :
|
|
{
|
|
PROVIDE( _bss = ABSOLUTE(.) );
|
|
/* Writable uninitialized small data segment (.sbss segment)*/
|
|
*(.sbss .sbss.*)
|
|
*(.gnu.linkonce.sb.*)
|
|
*(.scommon)
|
|
/* Uninitialized writeable data section (.bss segment)*/
|
|
*(.bss .bss.*)
|
|
*(.gnu.linkonce.b.*)
|
|
*(COMMON)
|
|
|
|
. = ALIGN(8);
|
|
PROVIDE( _ebss = ABSOLUTE(.) );
|
|
} >ram AT>ram :ram
|
|
|
|
PROVIDE( _tls_data = ABSOLUTE(.) );
|
|
/*
|
|
* Thread Local Storage (TLS) are per-thread global variables.
|
|
* Compilers such as GCC provide a __thread keyword to mark global
|
|
* variables as per-thread. Support is required in the program loader
|
|
* and thread creator.
|
|
*/
|
|
|
|
/* Thread-local data segment, .tdata (initialized tls). */
|
|
.tdata :
|
|
{
|
|
KEEP( *(.tdata.begin) )
|
|
*(.tdata .tdata.*)
|
|
*(.gnu.linkonce.td.*)
|
|
KEEP( *(.tdata.end) )
|
|
} >ram AT>ram :ram
|
|
|
|
/* Thread-local bss segment, .tbss (zero-initialized tls). */
|
|
.tbss :
|
|
{
|
|
*(.tbss .tbss.*)
|
|
*(.gnu.linkonce.tb.*)
|
|
KEEP( *(.tbss.end) )
|
|
} >ram AT>ram :ram
|
|
|
|
/*
|
|
* End of uninitalized data segement
|
|
*
|
|
* Actually the stack needs 16B alignment, and it won't hurt to also slightly
|
|
* increase the alignment to 32 or even 64 (cache line size).
|
|
*
|
|
* Align _heap_start to cache line size
|
|
*/
|
|
. = ALIGN(64);
|
|
PROVIDE( _end = ABSOLUTE(.) );
|
|
/* Leave 2 holes for stack & TLS, the size can set in kconfig */
|
|
PROVIDE( _heap_start = ABSOLUTE(.) + _stack_size * 2 );
|
|
PROVIDE( _tp0 = (_end + 63) & (-64) );
|
|
PROVIDE( _tp1 = _tp0 + _stack_size );
|
|
PROVIDE( _sp0 = _tp0 + _stack_size );
|
|
PROVIDE( _sp1 = _tp1 + _stack_size );
|
|
|
|
/* Heap end is at the end of memory, the memory size can set in kconfig */
|
|
PROVIDE( _heap_end = _ram_end );
|
|
}
|
|
|