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riscv: Support standalone

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Run hello_world successfully.

U-Boot 2018.01-rc2-00033-gb265b91-dirty (Dec 22 2017 - 13:54:21 +0800)

DRAM:  1 GiB
MMC:   mmc@f0e00000: 0
SF: Detected mx25u1635e with page size 256 Bytes, erase size 4 KiB, total 2 MiB
In:    serial@f0300000
Out:   serial@f0300000
Err:   serial@f0300000
Net:
Warning: mac@e0100000 (eth0) using random MAC address - 0a:47:9b:f8:b4:f2
eth0: mac@e0100000
RISC-V # mmc rescan
RISC-V # fatls mmc 0:1
318907   u-boot-ae250-64.bin
1252   hello_world_ae250_32.bin
328787   u-boot-ae250-32.bin

3 file(s), 0 dir(s)

RISC-V # fatload mmc 0:1 0x600000 hello_world_ae250_32.bin
reading hello_world_ae250_32.bin
1252 bytes read in 23 ms (52.7 KiB/s)
RISC-V # go 0x600000
Example expects ABI version 9
Actual U-Boot ABI version 9
Hello World
argc = 1
argv[0] = "0x600000"
argv[1] = "$B@"
Hit any key to exit ...

RISC-V #

Signed-off-by: Rick Chen <rick@andestech.com>
Signed-off-by: Rick Chen <rickchen36@gmail.com>
Signed-off-by: Greentime Hu <green.hu@gmail.com>
This commit is contained in:
Rick Chen 2017-12-26 13:55:57 +08:00 committed by Tom Rini
parent 42ac26f2b0
commit c7d7e80acd
2 changed files with 53 additions and 0 deletions
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41
examples/standalone/riscv.lds Normal file
View File

@ -0,0 +1,41 @@
/*
* Copyright (C) 2017 Andes Technology Corporation
* Rick Chen, Andes Technology Corporation <rick@andestech.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
OUTPUT_ARCH(riscv)
ENTRY(_start)
SECTIONS
{
. = ALIGN(4);
.text :
{
*(.text)
}
. = ALIGN(4);
.data : {
__global_pointer$ = . + 0x800;
*(.data)
}
. = ALIGN(4);
.got : {
__got_start = .;
*(.got)
__got_end = .;
}
. = ALIGN(4);
__bss_start = .;
.bss : { *(.bss) }
__bss_end = .;
. = ALIGN(4);
.rela.text : { *(.rela.text .rela.text.* .rela.gnu.linkonce.t.*) }
_end = .;
}

12
examples/standalone/stubs.c
View File

@ -172,6 +172,18 @@ gd_t *global_data;
" lwi $r16, [$r16 + (%1)]\n" \
" jr $r16\n" \
: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "$r16");
#elif defined(CONFIG_RISCV)
/*
* t7 holds the pointer to the global_data. gp is call clobbered.
*/
#define EXPORT_FUNC(f, a, x, ...) \
asm volatile ( \
" .globl " #x "\n" \
#x ":\n" \
" lw x19, %0(gp)\n" \
" lw x19, %1(x19)\n" \
" jr x19\n" \
: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "x19");
#elif defined(CONFIG_ARC)
/*
* r25 holds the pointer to the global_data. r10 is call clobbered.