acffb81485
The GRUB is failing to build with GCC-12 in many places like this:
In function 'init_cbfsdisk',
inlined from 'grub_mod_init' at ../../grub-core/fs/cbfs.c:391:3:
../../grub-core/fs/cbfs.c:345:7: error: array subscript 0 is outside array bounds of 'grub_uint32_t[0]' {aka 'unsigned int[]'} [-Werror=array-bounds]
345 | ptr = *(grub_uint32_t *) 0xfffffffc;
| ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This is caused by GCC regression in 11/12 [1]. In a nut shell, the
warning is about detected invalid accesses at non-zero offsets to NULL
pointers. Since hardwired constant address is treated as NULL plus an
offset in the same underlying code, the warning is therefore triggered.
Instead of inserting #pragma all over the places where literal pointers
are accessed to avoid diagnosing array-bounds, we can try to borrow the
idea from Linux kernel that the absolute_pointer() macro [2][3] is used
to disconnect a pointer using literal address from it's original object,
hence GCC won't be able to make assumptions on the boundary while doing
pointer arithmetic. With that we can greatly reduce the code we have to
cover up by making initial literal pointer assignment to use the new
wrapper but not having to track everywhere literal pointers are
accessed. This also makes code looks cleaner.
Please note the grub_absolute_pointer() macro requires to be invoked in
a function as long as it is compound expression. Some global variables
with literal pointers has been changed to local ones in order to use
grub_absolute_pointer() to initialize it. The shuffling is basically done
in a selective and careful way that the variable's scope doesn't matter
being local or global, for example, the global variable must not get
modified at run time throughout. For the record, here's the list of
global variables got shuffled in this patch:
grub-core/commands/i386/pc/drivemap.c:int13slot
grub-core/term/i386/pc/console.c:bios_data_area
grub-core/term/ns8250.c:serial_hw_io_addr
[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99578
[2] https://elixir.bootlin.com/linux/v5.16.14/source/include/linux/compiler.h#L180
[3] https://elixir.bootlin.com/linux/v5.16.14/source/include/linux/compiler-gcc.h#L31
Signed-off-by: Michael Chang <mchang@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
310 lines
8.9 KiB
C
310 lines
8.9 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2003,2005,2007,2008,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/machine/memory.h>
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#include <grub/machine/console.h>
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#include <grub/term.h>
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#include <grub/types.h>
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#include <grub/machine/int.h>
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static grub_uint8_t grub_console_cur_color = 0x7;
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static void
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int10_9 (grub_uint8_t ch, grub_uint16_t n)
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{
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struct grub_bios_int_registers regs;
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regs.eax = ch | 0x0900;
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regs.ebx = grub_console_cur_color & 0xff;
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regs.ecx = n;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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grub_bios_interrupt (0x10, ®s);
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}
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/*
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* BIOS call "INT 10H Function 03h" to get cursor position
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* Call with %ah = 0x03
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* %bh = page
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* Returns %ch = starting scan line
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* %cl = ending scan line
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* %dh = row (0 is top)
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* %dl = column (0 is left)
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*/
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static struct grub_term_coordinate
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grub_console_getxy (struct grub_term_output *term __attribute__ ((unused)))
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{
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struct grub_bios_int_registers regs;
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regs.eax = 0x0300;
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regs.ebx = 0;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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grub_bios_interrupt (0x10, ®s);
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return (struct grub_term_coordinate) {
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(regs.edx & 0xff), ((regs.edx & 0xff00) >> 8) };
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}
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/*
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* BIOS call "INT 10H Function 02h" to set cursor position
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* Call with %ah = 0x02
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* %bh = page
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* %dh = row (0 is top)
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* %dl = column (0 is left)
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*/
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static void
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grub_console_gotoxy (struct grub_term_output *term __attribute__ ((unused)),
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struct grub_term_coordinate pos)
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{
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struct grub_bios_int_registers regs;
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/* set page to 0 */
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regs.ebx = 0;
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regs.eax = 0x0200;
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regs.edx = (pos.y << 8) | pos.x;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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grub_bios_interrupt (0x10, ®s);
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}
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/*
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*
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* Put the character C on the console. Because GRUB wants to write a
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* character with an attribute, this implementation is a bit tricky.
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* If C is a control character (CR, LF, BEL, BS), use INT 10, AH = 0Eh
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* (TELETYPE OUTPUT). Otherwise, use INT 10, AH = 9 to write character
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* with attributes and advance cursor. If we are on the last column,
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* let BIOS to wrap line correctly.
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*/
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static void
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grub_console_putchar_real (grub_uint8_t c)
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{
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struct grub_bios_int_registers regs;
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struct grub_term_coordinate pos;
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if (c == 7 || c == 8 || c == 0xa || c == 0xd)
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{
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regs.eax = c | 0x0e00;
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regs.ebx = 0x0001;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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grub_bios_interrupt (0x10, ®s);
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return;
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}
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/* get the current position */
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pos = grub_console_getxy (NULL);
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/* write the character with the attribute */
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int10_9 (c, 1);
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/* check the column with the width */
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if (pos.x >= 79)
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{
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grub_console_putchar_real (0x0d);
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grub_console_putchar_real (0x0a);
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}
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else
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grub_console_gotoxy (NULL, (struct grub_term_coordinate) { pos.x + 1,
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pos.y });
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}
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static void
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grub_console_putchar (struct grub_term_output *term __attribute__ ((unused)),
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const struct grub_unicode_glyph *c)
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{
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grub_console_putchar_real (c->base);
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}
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/*
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* BIOS call "INT 10H Function 09h" to write character and attribute
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* Call with %ah = 0x09
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* %al = (character)
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* %bh = (page number)
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* %bl = (attribute)
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* %cx = (number of times)
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*/
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static void
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grub_console_cls (struct grub_term_output *term)
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{
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/* move the cursor to the beginning */
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grub_console_gotoxy (term, (struct grub_term_coordinate) { 0, 0 });
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/* write spaces to the entire screen */
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int10_9 (' ', 80 * 25);
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/* move back the cursor */
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grub_console_gotoxy (term, (struct grub_term_coordinate) { 0, 0 });
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}
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/*
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* void grub_console_setcursor (int on)
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* BIOS call "INT 10H Function 01h" to set cursor type
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* Call with %ah = 0x01
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* %ch = cursor starting scanline
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* %cl = cursor ending scanline
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*/
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static void
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grub_console_setcursor (struct grub_term_output *term __attribute__ ((unused)),
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int on)
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{
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static grub_uint16_t console_cursor_shape = 0;
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struct grub_bios_int_registers regs;
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/* check if the standard cursor shape has already been saved */
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if (!console_cursor_shape)
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{
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regs.eax = 0x0300;
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regs.ebx = 0;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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grub_bios_interrupt (0x10, ®s);
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console_cursor_shape = regs.ecx;
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if ((console_cursor_shape >> 8) >= (console_cursor_shape & 0xff))
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console_cursor_shape = 0x0d0e;
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}
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/* set %cx to the designated cursor shape */
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regs.ecx = on ? console_cursor_shape : 0x2000;
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regs.eax = 0x0100;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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grub_bios_interrupt (0x10, ®s);
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}
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/*
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* if there is a character pending, return it; otherwise return -1
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* BIOS call "INT 16H Function 01H" to check whether a character is pending
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* Call with %ah = 0x1
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* Return:
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* If key waiting to be input:
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* %ah = keyboard scan code
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* %al = ASCII character
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* Zero flag = clear
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* else
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* Zero flag = set
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* BIOS call "INT 16H Function 00H" to read character from keyboard
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* Call with %ah = 0x0
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* Return: %ah = keyboard scan code
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* %al = ASCII character
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*/
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static int
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grub_console_getkey (struct grub_term_input *term __attribute__ ((unused)))
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{
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const grub_uint16_t bypass_table[] = {
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0x0100 | GRUB_TERM_ESC, 0x0f00 | GRUB_TERM_TAB, 0x0e00 | GRUB_TERM_BACKSPACE, 0x1c00 | '\r', 0x1c00 | '\n'
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};
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struct grub_bios_int_registers regs;
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unsigned i;
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/*
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* Due to a bug in apple's bootcamp implementation, INT 16/AH = 0 would
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* cause the machine to hang at the second keystroke. However, we can
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* work around this problem by ensuring the presence of keystroke with
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* INT 16/AH = 1 before calling INT 16/AH = 0.
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*/
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regs.eax = 0x0100;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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grub_bios_interrupt (0x16, ®s);
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if (regs.flags & GRUB_CPU_INT_FLAGS_ZERO)
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return GRUB_TERM_NO_KEY;
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regs.eax = 0x0000;
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regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
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grub_bios_interrupt (0x16, ®s);
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if (!(regs.eax & 0xff))
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return ((regs.eax >> 8) & 0xff) | GRUB_TERM_EXTENDED;
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if ((regs.eax & 0xff) >= ' ')
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return regs.eax & 0xff;
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for (i = 0; i < ARRAY_SIZE (bypass_table); i++)
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if (bypass_table[i] == (regs.eax & 0xffff))
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return regs.eax & 0xff;
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return (regs.eax & 0xff) + (('a' - 1) | GRUB_TERM_CTRL);
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}
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static int
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grub_console_getkeystatus (struct grub_term_input *term __attribute__ ((unused)))
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{
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const struct grub_machine_bios_data_area *bios_data_area =
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(struct grub_machine_bios_data_area *) grub_absolute_pointer (GRUB_MEMORY_MACHINE_BIOS_DATA_AREA_ADDR);
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/* conveniently GRUB keystatus is modelled after BIOS one. */
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return bios_data_area->keyboard_flag_lower & ~0x80;
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}
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static struct grub_term_coordinate
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grub_console_getwh (struct grub_term_output *term __attribute__ ((unused)))
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{
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return (struct grub_term_coordinate) { 80, 25 };
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}
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static void
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grub_console_setcolorstate (struct grub_term_output *term
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__attribute__ ((unused)),
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grub_term_color_state state)
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{
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switch (state) {
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case GRUB_TERM_COLOR_STANDARD:
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grub_console_cur_color = GRUB_TERM_DEFAULT_STANDARD_COLOR & 0x7f;
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break;
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case GRUB_TERM_COLOR_NORMAL:
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grub_console_cur_color = grub_term_normal_color & 0x7f;
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break;
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case GRUB_TERM_COLOR_HIGHLIGHT:
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grub_console_cur_color = grub_term_highlight_color & 0x7f;
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break;
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default:
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break;
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}
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}
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static struct grub_term_input grub_console_term_input =
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{
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.name = "console",
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.getkey = grub_console_getkey,
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.getkeystatus = grub_console_getkeystatus
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};
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static struct grub_term_output grub_console_term_output =
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{
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.name = "console",
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.putchar = grub_console_putchar,
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.getwh = grub_console_getwh,
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.getxy = grub_console_getxy,
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.gotoxy = grub_console_gotoxy,
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.cls = grub_console_cls,
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.setcolorstate = grub_console_setcolorstate,
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.setcursor = grub_console_setcursor,
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.flags = GRUB_TERM_CODE_TYPE_CP437,
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.progress_update_divisor = GRUB_PROGRESS_FAST
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};
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void
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grub_console_init (void)
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{
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grub_term_register_output ("console", &grub_console_term_output);
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grub_term_register_input ("console", &grub_console_term_input);
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}
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void
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grub_console_fini (void)
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{
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grub_term_unregister_input (&grub_console_term_input);
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grub_term_unregister_output (&grub_console_term_output);
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}
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