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Added riscv.ld linker script (static entry point at 0x10000)

This commit is contained in:
Clifford Wolf 2017-01-13 17:04:22 +01:00
parent 8e5deeb0cb
commit 4e6cad88bc
4 changed files with 292 additions and 2 deletions
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2
dhrystone/Makefile
View File

@ -44,7 +44,7 @@ dhry.elf: $(OBJS) sections.lds
chmod -x $@
else
dhry.elf: $(OBJS)
$(TOOLCHAIN_PREFIX)gcc $(CFLAGS) -Wl,-Bstatic,-Map,dhry.map,--strip-debug -o $@ $(OBJS) -lgcc -lc
$(TOOLCHAIN_PREFIX)gcc $(CFLAGS) -Wl,-Bstatic,-T,../firmware/riscv.ld,-Map,dhry.map,--strip-debug -o $@ $(OBJS) -lgcc -lc
chmod -x $@
endif

200
firmware/riscv.ld Normal file
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@ -0,0 +1,200 @@
/* Default linker script, for normal executables */
/* Copyright (C) 2014-2016 Free Software Foundation, Inc.
Copying and distribution of this script, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved. */
OUTPUT_FORMAT("elf32-littleriscv", "elf32-littleriscv",
"elf32-littleriscv")
OUTPUT_ARCH(riscv)
ENTRY(_start)
SECTIONS
{
. = 0x00010000;
.text :
{
*(.text)
*(.text.unlikely .text.*_unlikely .text.unlikely.*)
*(.text.exit .text.exit.*)
*(.text.startup .text.startup.*)
*(.text.hot .text.hot.*)
*(.stub .text.* .gnu.linkonce.t.*)
/* .gnu.warning sections are handled specially by elf32.em. */
*(.gnu.warning)
}
.init :
{
KEEP (*(SORT_NONE(.init)))
}
.plt : { *(.plt) }
.iplt : { *(.iplt) }
.fini :
{
KEEP (*(SORT_NONE(.fini)))
}
PROVIDE (__etext = .);
PROVIDE (_etext = .);
PROVIDE (etext = .);
.rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) }
.rodata1 : { *(.rodata1) }
.sdata2 :
{
*(.sdata2 .sdata2.* .gnu.linkonce.s2.*)
}
.sbss2 : { *(.sbss2 .sbss2.* .gnu.linkonce.sb2.*) }
.eh_frame_hdr : { *(.eh_frame_hdr) *(.eh_frame_entry .eh_frame_entry.*) }
.eh_frame : ONLY_IF_RO { KEEP (*(.eh_frame)) *(.eh_frame.*) }
.gcc_except_table : ONLY_IF_RO { *(.gcc_except_table
.gcc_except_table.*) }
.gnu_extab : ONLY_IF_RO { *(.gnu_extab*) }
/* These sections are generated by the Sun/Oracle C++ compiler. */
.exception_ranges : ONLY_IF_RO { *(.exception_ranges
.exception_ranges*) }
/* Adjust the address for the data segment. We want to adjust up to
the same address within the page on the next page up. */
. = DATA_SEGMENT_ALIGN (CONSTANT (MAXPAGESIZE), CONSTANT (COMMONPAGESIZE));
/* Exception handling */
.eh_frame : ONLY_IF_RW { KEEP (*(.eh_frame)) *(.eh_frame.*) }
.gnu_extab : ONLY_IF_RW { *(.gnu_extab) }
.gcc_except_table : ONLY_IF_RW { *(.gcc_except_table .gcc_except_table.*) }
.exception_ranges : ONLY_IF_RW { *(.exception_ranges .exception_ranges*) }
/* Thread Local Storage sections */
.tdata : { *(.tdata .tdata.* .gnu.linkonce.td.*) }
.tbss : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) }
.preinit_array :
{
PROVIDE_HIDDEN (__preinit_array_start = .);
KEEP (*(.preinit_array))
PROVIDE_HIDDEN (__preinit_array_end = .);
}
.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 = .);
}
.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 = .);
}
.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))
}
.dtors :
{
KEEP (*crtbegin.o(.dtors))
KEEP (*crtbegin?.o(.dtors))
KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .dtors))
KEEP (*(SORT(.dtors.*)))
KEEP (*(.dtors))
}
.jcr : { KEEP (*(.jcr)) }
.data.rel.ro : { *(.data.rel.ro.local* .gnu.linkonce.d.rel.ro.local.*) *(.data.rel.ro .data.rel.ro.* .gnu.linkonce.d.rel.ro.*) }
.dynamic : { *(.dynamic) }
. = DATA_SEGMENT_RELRO_END (0, .);
.data :
{
*(.data .data.* .gnu.linkonce.d.*)
SORT(CONSTRUCTORS)
}
.data1 : { *(.data1) }
.got : { *(.got.plt) *(.igot.plt) *(.got) *(.igot) }
/* 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 :
{
_gp = . + 0x800;
*(.srodata.cst16) *(.srodata.cst8) *(.srodata.cst4) *(.srodata.cst2) *(.srodata .srodata.*)
*(.sdata .sdata.* .gnu.linkonce.s.*)
}
_edata = .; PROVIDE (edata = .);
. = .;
__bss_start = .;
.sbss :
{
*(.dynsbss)
*(.sbss .sbss.* .gnu.linkonce.sb.*)
*(.scommon)
}
.bss :
{
*(.dynbss)
*(.bss .bss.* .gnu.linkonce.b.*)
*(COMMON)
/* Align here to ensure that the .bss section occupies space up to
_end. Align after .bss to ensure correct alignment even if the
.bss section disappears because there are no input sections.
FIXME: Why do we need it? When there is no .bss section, we don't
pad the .data section. */
. = ALIGN(. != 0 ? 32 / 8 : 1);
}
. = ALIGN(32 / 8);
. = SEGMENT_START("ldata-segment", .);
. = ALIGN(32 / 8);
_end = .; PROVIDE (end = .);
. = DATA_SEGMENT_END (.);
/* 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 .gnu.linkonce.wi.*) }
.debug_abbrev 0 : { *(.debug_abbrev) }
.debug_line 0 : { *(.debug_line .debug_line.* .debug_line_end ) }
.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) }
/* DWARF 3 */
.debug_pubtypes 0 : { *(.debug_pubtypes) }
.debug_ranges 0 : { *(.debug_ranges) }
/* DWARF Extension. */
.debug_macro 0 : { *(.debug_macro) }
.debug_addr 0 : { *(.debug_addr) }
.gnu.attributes 0 : { KEEP (*(.gnu.attributes)) }
/DISCARD/ : { *(.note.GNU-stack) *(.gnu_debuglink) *(.gnu.lto_*) }
}

90
firmware/riscv_ld.diff Normal file
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@ -0,0 +1,90 @@
--- <(riscv32-unknown-elf-ld -z nocombreloc -verbose) 2017-01-13 16:55:07.569030165 +0100
+++ riscv.ld 2017-01-13 16:56:47.796761642 +0100
@@ -1,9 +1,3 @@
-GNU ld (GNU Binutils) 2.28.51.20170101
- Supported emulations:
- elf32lriscv
- elf64lriscv
-using internal linker script:
-==================================================
/* Default linker script, for normal executables */
/* Copyright (C) 2014-2016 Free Software Foundation, Inc.
Copying and distribution of this script, with or without modification,
@@ -13,62 +7,26 @@
"elf32-littleriscv")
OUTPUT_ARCH(riscv)
ENTRY(_start)
-SEARCH_DIR("/opt/new_riscv32i/riscv32-unknown-elf/lib");
SECTIONS
{
- /* Read-only sections, merged into text segment: */
- PROVIDE (__executable_start = SEGMENT_START("text-segment", 0x10000)); . = SEGMENT_START("text-segment", 0x10000) + SIZEOF_HEADERS;
- .interp : { *(.interp) }
- .note.gnu.build-id : { *(.note.gnu.build-id) }
- .hash : { *(.hash) }
- .gnu.hash : { *(.gnu.hash) }
- .dynsym : { *(.dynsym) }
- .dynstr : { *(.dynstr) }
- .gnu.version : { *(.gnu.version) }
- .gnu.version_d : { *(.gnu.version_d) }
- .gnu.version_r : { *(.gnu.version_r) }
- .rela.init : { *(.rela.init) }
- .rela.text : { *(.rela.text .rela.text.* .rela.gnu.linkonce.t.*) }
- .rela.fini : { *(.rela.fini) }
- .rela.rodata : { *(.rela.rodata .rela.rodata.* .rela.gnu.linkonce.r.*) }
- .rela.data.rel.ro : { *(.rela.data.rel.ro .rela.data.rel.ro.* .rela.gnu.linkonce.d.rel.ro.*) }
- .rela.data : { *(.rela.data .rela.data.* .rela.gnu.linkonce.d.*) }
- .rela.tdata : { *(.rela.tdata .rela.tdata.* .rela.gnu.linkonce.td.*) }
- .rela.tbss : { *(.rela.tbss .rela.tbss.* .rela.gnu.linkonce.tb.*) }
- .rela.ctors : { *(.rela.ctors) }
- .rela.dtors : { *(.rela.dtors) }
- .rela.got : { *(.rela.got) }
- .rela.sdata : { *(.rela.sdata .rela.sdata.* .rela.gnu.linkonce.s.*) }
- .rela.sbss : { *(.rela.sbss .rela.sbss.* .rela.gnu.linkonce.sb.*) }
- .rela.sdata2 : { *(.rela.sdata2 .rela.sdata2.* .rela.gnu.linkonce.s2.*) }
- .rela.sbss2 : { *(.rela.sbss2 .rela.sbss2.* .rela.gnu.linkonce.sb2.*) }
- .rela.bss : { *(.rela.bss .rela.bss.* .rela.gnu.linkonce.b.*) }
- .rela.iplt :
- {
- PROVIDE_HIDDEN (__rela_iplt_start = .);
- *(.rela.iplt)
- PROVIDE_HIDDEN (__rela_iplt_end = .);
- }
- .rela.plt :
- {
- *(.rela.plt)
- }
- .init :
- {
- KEEP (*(SORT_NONE(.init)))
- }
- .plt : { *(.plt) }
- .iplt : { *(.iplt) }
+ . = 0x00010000;
.text :
{
+ *(.text)
*(.text.unlikely .text.*_unlikely .text.unlikely.*)
*(.text.exit .text.exit.*)
*(.text.startup .text.startup.*)
*(.text.hot .text.hot.*)
- *(.text .stub .text.* .gnu.linkonce.t.*)
+ *(.stub .text.* .gnu.linkonce.t.*)
/* .gnu.warning sections are handled specially by elf32.em. */
*(.gnu.warning)
}
+ .init :
+ {
+ KEEP (*(SORT_NONE(.init)))
+ }
+ .plt : { *(.plt) }
+ .iplt : { *(.iplt) }
.fini :
{
KEEP (*(SORT_NONE(.fini)))
@@ -240,5 +198,3 @@
/DISCARD/ : { *(.note.GNU-stack) *(.gnu_debuglink) *(.gnu.lto_*) }
}
-
-==================================================

2
scripts/cxxdemo/Makefile
View File

@ -22,7 +22,7 @@ firmware32.hex: firmware.elf start.elf hex8tohex32.py
rm -f start.tmp firmware.tmp
firmware.elf: firmware.o syscalls.o
$(CC) $(LDFLAGS) -o $@ $^ $(LDLIBS)
$(CC) $(LDFLAGS) -o $@ $^ -T ../../firmware/riscv.ld $(LDLIBS)
chmod -x firmware.elf
start.elf: start.S start.ld