Shell stub.

.circleci/config.yml

@@ -18,6 +18,7 @@ jobs:
           name: Build
           command: |
             make -j 2
+            make -C src/mips/shell -j 2
             make -C src/mips/openbios -j 2
 
 workflows:

src/mips/shell/Makefile

@@ -0,0 +1,10 @@
+TARGET = shell
+
+SRCS = \
+../common/hardware/cop0.s \
+crt0/crt0.s \
+main/main.c \
+
+LDSCRIPT = shell.ld
+
+include ../common.mk

src/mips/shell/crt0/crt0.s

@@ -0,0 +1,43 @@
+/***************************************************************************
+ *   Copyright (C) 2019 PCSX-Redux authors                                 *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   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.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
+ ***************************************************************************/
+
+    .section .start, "ax", @progbits
+    .align 2
+    .global main
+    .global _start
+    .type _start, @function
+
+_start:
+    la    $t0, __bss_start
+    la    $t1, __bss_end
+
+    beq   $t0, $t1, bss_init_skip
+
+bss_init:
+    sw    $0, 0($t0)
+    addiu $t0, 4
+    bne   $t0, $t1, bss_init
+
+bss_init_skip:
+
+    li    $a0, 0
+    li    $a1, 0
+    jal   main
+
+    jr    $ra

src/mips/shell/main/main.c

@@ -0,0 +1,24 @@
+/***************************************************************************
+ *   Copyright (C) 2019 PCSX-Redux authors                                 *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   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.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
+ ***************************************************************************/
+
+#include "common/hardware/cop0.h"
+
+int main() {
+    return 0;
+}

src/mips/shell/shell.ld

@@ -0,0 +1,104 @@
+/***************************************************************************
+ *   Copyright (C) 2019 PCSX-Redux authors                                 *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   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.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
+ ***************************************************************************/
+
+OUTPUT_FORMAT("elf32-tradlittlemips")
+OUTPUT_ARCH(mips)
+
+EXTERN(_start)
+ENTRY(_start)
+
+MEMORY {
+    ram (rwx)   : ORIGIN = 0x80010000, LENGTH = 2M - 0x10000
+    dcache      : ORIGIN = 0x1f800000, LENGTH = 0x400
+}
+
+__ram_top       = ORIGIN(ram) + LENGTH(ram);
+__sp            = __ram_top - 0x100;
+
+__dcache        = ORIGIN(dcache);
+__dcache_top    = ORIGIN(dcache) + LENGTH(dcache);
+
+__bss_len       = (__bss_end - __bss_start);
+
+SECTIONS {
+    __text_start = .;
+    .text : {
+        *(.start)
+        *(.init)
+        KEEP (*(SORT_NONE(.fini)))
+        *(.text.unlikely .text.*_unlikely .text.unlikely.*)
+        *(.text.exit .text.exit.*)
+        *(.text.startup .text.startup.*)
+        *(.text.hot .text.hot.*)
+        *(.text .stub .text.* .gnu.linkonce.t.*)
+        . = ALIGN(4);
+    } > ram
+
+    .fini : {
+    } > ram
+    . = ALIGN(4);
+    __text_end = .;
+
+    .rodata : {
+        *(.rodata .rodata.* .rdata .rdata.* .gnu.linkonce.r.*)
+    } > ram
+
+    .rodata1 : {
+        *(.rodata1)
+    } > ram
+
+    __data_start = .;
+    .data : {
+        *(.a0table)
+        *(.data .data.* .gnu.linkonce.d.*)
+        *(.data1)
+        *(.got.plt)
+        *(.got)
+    } > ram
+
+    . = ALIGN(4);
+
+    __bss_start = .;
+    .sbss : {
+        *(.dynsbss)
+        *(.sbss .sbss.* .gnu.linkonce.sb.*)
+        *(.scommon)
+        *(.dynbss)
+        *(.bss .bss.* .gnu.linkonce.b.*)
+        *(COMMON)
+    } > ram
+
+    . = ALIGN(4);
+    __bss_end = .;
+
+    __end = .;
+
+    /DISCARD/ : { *(.MIPS.abiflags) }
+
+    /* Everything is statically linked, so discard PLTs. */
+    /DISCARD/ : { *(.rel.iplt) *(.rela.iplt) *(.rel.plt) *(.rela.plt) *(.plt) *(.iplt) }
+
+    /* We don't make use of debugging information, so drop that, too. */
+    /DISCARD/ : { *(.debug) *(.debug_srcinfo) *(.debug_sfnames) *(.debug_aranges) *(.debug_pubnames) *(.debug_info .gnu.linkonce.wi.*) *(.debug_abbrev) *(.debug_line .debug_line.* .debug_line_end ) *(.debug_frame) *(.debug_str) *(.debug_loc) *(.debug_macinfo) *(.debug_weaknames) *(.debug_funcnames) *(.debug_typenames) *(.debug_varnames) *(.debug_pubtypes) *(.debug_ranges) *(.debug_macro) *(.mdebug.abi32) *(.mdebug.abiN32) *(.mdebug.abi64) *(.mdebug.abiO64) *(.mdebug.eabi32) *(.mdebug.eabi64) }
+
+    /* Discard things that the standard link script drops, too. */
+    /DISCARD/ : { *(.note.GNU-stack) *(.gnu_debuglink) *(.gnu.lto_*) }
+
+    /DISCARD/ : { *(.note.gnu.build-id) }
+}