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|
Borrowed and tweaked fix from:
commit acffb81485e35e1f28152949a1c6e1d4dbf5172e
Author: Michael Chang <mchang@suse.com>
Date: Mon Mar 28 15:00:53 2022 +0800
build: Fix -Werror=array-bounds array subscript 0 is outside array bounds
diff --git a/grub-core/bus/cs5536.c b/grub-core/bus/cs5536.c
index 8c90ed598..cd0a45e58 100644
--- a/grub-core/bus/cs5536.c
+++ b/grub-core/bus/cs5536.c
@@ -331,8 +331,9 @@ grub_cs5536_init_geode (grub_pci_device_t dev)
{
volatile grub_uint32_t *oc;
- oc = grub_pci_device_map_range (dev, 0x05022000,
- GRUB_CS5536_USB_OPTION_REGS_SIZE);
+
+ oc = grub_absolute_pointer (grub_pci_device_map_range (dev, 0x05022000,
+ GRUB_CS5536_USB_OPTION_REGS_SIZE));
oc[GRUB_CS5536_USB_OPTION_REG_UOCMUX] =
(oc[GRUB_CS5536_USB_OPTION_REG_UOCMUX]
diff --git a/grub-core/commands/acpi.c b/grub-core/commands/acpi.c
index 1215f2a62..fda62f4ea 100644
--- a/grub-core/commands/acpi.c
+++ b/grub-core/commands/acpi.c
@@ -168,7 +168,7 @@ grub_acpi_create_ebda (void)
struct grub_acpi_rsdp_v10 *v1;
struct grub_acpi_rsdp_v20 *v2;
- ebda = (grub_uint8_t *) (grub_addr_t) ((*((grub_uint16_t *)0x40e)) << 4);
+ ebda = (grub_uint8_t *) (grub_addr_t) ((*((grub_uint16_t *) grub_absolute_pointer (0x40e))) << 4);
grub_dprintf ("acpi", "EBDA @%p\n", ebda);
if (ebda)
ebda_kb_len = *(grub_uint16_t *) ebda;
@@ -298,7 +298,7 @@ grub_acpi_create_ebda (void)
*target = 0;
grub_dprintf ("acpi", "Switching EBDA\n");
- (*((grub_uint16_t *) 0x40e)) = ((grub_addr_t) targetebda) >> 4;
+ (*((grub_uint16_t *) grub_absolute_pointer (0x40e))) = ((grub_addr_t) targetebda) >> 4;
grub_dprintf ("acpi", "EBDA switched\n");
return GRUB_ERR_NONE;
diff --git a/grub-core/commands/efi/loadbios.c b/grub-core/commands/efi/loadbios.c
index 5c7725f8b..574e41046 100644
--- a/grub-core/commands/efi/loadbios.c
+++ b/grub-core/commands/efi/loadbios.c
@@ -46,7 +46,7 @@ enable_rom_area (void)
grub_uint32_t *rom_ptr;
grub_pci_device_t dev = { .bus = 0, .device = 0, .function = 0};
- rom_ptr = (grub_uint32_t *) VBIOS_ADDR;
+ rom_ptr = grub_absolute_pointer (VBIOS_ADDR);
if (*rom_ptr != BLANK_MEM)
{
grub_puts_ (N_("ROM image is present."));
@@ -96,8 +96,8 @@ fake_bios_data (int use_rom)
void *acpi, *smbios;
grub_uint16_t *ebda_seg_ptr, *low_mem_ptr;
- ebda_seg_ptr = (grub_uint16_t *) EBDA_SEG_ADDR;
- low_mem_ptr = (grub_uint16_t *) LOW_MEM_ADDR;
+ ebda_seg_ptr = grub_absolute_pointer (EBDA_SEG_ADDR);
+ low_mem_ptr = grub_absolute_pointer (LOW_MEM_ADDR);
if ((*ebda_seg_ptr) || (*low_mem_ptr))
return;
@@ -132,7 +132,8 @@ fake_bios_data (int use_rom)
*ebda_seg_ptr = FAKE_EBDA_SEG;
*low_mem_ptr = (FAKE_EBDA_SEG >> 6);
- *((grub_uint16_t *) (FAKE_EBDA_SEG << 4)) = 640 - *low_mem_ptr;
+ /* *((grub_uint16_t *) (FAKE_EBDA_SEG << 4)) = 640 - *low_mem_ptr; */
+ *((grub_uint16_t *) (grub_absolute_pointer (FAKE_EBDA_SEG << 4))) = 640 - *low_mem_ptr;
if (acpi)
grub_memcpy ((char *) ((FAKE_EBDA_SEG << 4) + 16), acpi, 1024 - 16);
diff --git a/grub-core/commands/i386/pc/drivemap.c b/grub-core/commands/i386/pc/drivemap.c
index 3fb22dc46..a7ee4c9bd 100644
--- a/grub-core/commands/i386/pc/drivemap.c
+++ b/grub-core/commands/i386/pc/drivemap.c
@@ -31,9 +31,6 @@
GRUB_MOD_LICENSE ("GPLv3+");
-/* Real mode IVT slot (seg:off far pointer) for interrupt 0x13. */
-static grub_uint32_t *const int13slot = (grub_uint32_t *) (4 * 0x13);
-
/* Remember to update enum opt_idxs accordingly. */
static const struct grub_arg_option options[] = {
/* TRANSLATORS: In this file "mapping" refers to a change GRUB makes so if
@@ -280,6 +277,8 @@ install_int13_handler (int noret __attribute__ ((unused)))
grub_uint8_t *handler_base = 0;
/* Address of the map within the deployed bundle. */
int13map_node_t *handler_map;
+ /* Real mode IVT slot (seg:off far pointer) for interrupt 0x13. */
+ grub_uint32_t *int13slot = (grub_uint32_t *) grub_absolute_pointer (4 * 0x13);
int i;
int entries = 0;
@@ -354,6 +353,9 @@ install_int13_handler (int noret __attribute__ ((unused)))
static grub_err_t
uninstall_int13_handler (void)
{
+ /* Real mode IVT slot (seg:off far pointer) for interrupt 0x13. */
+ grub_uint32_t *int13slot = (grub_uint32_t *) grub_absolute_pointer (4 * 0x13);
+
if (! grub_drivemap_oldhandler)
return GRUB_ERR_NONE;
diff --git a/grub-core/disk/i386/pc/biosdisk.c b/grub-core/disk/i386/pc/biosdisk.c
index 81fd4e832..49e4e8a14 100644
--- a/grub-core/disk/i386/pc/biosdisk.c
+++ b/grub-core/disk/i386/pc/biosdisk.c
@@ -367,7 +367,7 @@ grub_biosdisk_open (const char *name, grub_disk_t disk)
if (version)
{
struct grub_biosdisk_drp *drp
- = (struct grub_biosdisk_drp *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
+ = (struct grub_biosdisk_drp *) grub_absolute_pointer (GRUB_MEMORY_MACHINE_SCRATCH_ADDR);
/* Clear out the DRP. */
grub_memset (drp, 0, sizeof (*drp));
@@ -654,7 +654,7 @@ grub_disk_biosdisk_fini (void)
GRUB_MOD_INIT(biosdisk)
{
struct grub_biosdisk_cdrp *cdrp
- = (struct grub_biosdisk_cdrp *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
+ = (struct grub_biosdisk_cdrp *) grub_absolute_pointer (GRUB_MEMORY_MACHINE_SCRATCH_ADDR);
grub_uint8_t boot_drive;
if (grub_disk_firmware_is_tainted)
diff --git a/grub-core/fs/cbfs.c b/grub-core/fs/cbfs.c
index 581215ef1..8ab7106af 100644
--- a/grub-core/fs/cbfs.c
+++ b/grub-core/fs/cbfs.c
@@ -342,7 +342,7 @@ init_cbfsdisk (void)
grub_uint32_t ptr;
struct cbfs_header *head;
- ptr = *(grub_uint32_t *) 0xfffffffc;
+ ptr = *((grub_uint32_t *) grub_absolute_pointer (0xfffffffc));
head = (struct cbfs_header *) (grub_addr_t) ptr;
grub_dprintf ("cbfs", "head=%p\n", head);
diff --git a/grub-core/kern/i386/pc/acpi.c b/grub-core/kern/i386/pc/acpi.c
index 297f5d05f..0a69eba7b 100644
--- a/grub-core/kern/i386/pc/acpi.c
+++ b/grub-core/kern/i386/pc/acpi.c
@@ -27,7 +27,7 @@ grub_machine_acpi_get_rsdpv1 (void)
grub_uint8_t *ebda, *ptr;
grub_dprintf ("acpi", "Looking for RSDP. Scanning EBDA\n");
- ebda = (grub_uint8_t *) ((* ((grub_uint16_t *) 0x40e)) << 4);
+ ebda = (grub_uint8_t *) ((* ((grub_uint16_t *) grub_absolute_pointer (0x40e))) << 4);
ebda_len = * (grub_uint16_t *) ebda;
if (! ebda_len) /* FIXME do we really need this check? */
goto scan_bios;
@@ -55,7 +55,7 @@ grub_machine_acpi_get_rsdpv2 (void)
grub_uint8_t *ebda, *ptr;
grub_dprintf ("acpi", "Looking for RSDP. Scanning EBDA\n");
- ebda = (grub_uint8_t *) ((* ((grub_uint16_t *) 0x40e)) << 4);
+ ebda = (grub_uint8_t *) ((* ((grub_uint16_t *) grub_absolute_pointer (0x40e))) << 4);
ebda_len = * (grub_uint16_t *) ebda;
if (! ebda_len) /* FIXME do we really need this check? */
goto scan_bios;
diff --git a/grub-core/kern/i386/pc/mmap.c b/grub-core/kern/i386/pc/mmap.c
index ef2faa2ab..53fcf45af 100644
--- a/grub-core/kern/i386/pc/mmap.c
+++ b/grub-core/kern/i386/pc/mmap.c
@@ -143,7 +143,7 @@ grub_machine_mmap_iterate (grub_memory_hook_t hook, void *hook_data)
{
grub_uint32_t cont = 0;
struct grub_machine_mmap_entry *entry
- = (struct grub_machine_mmap_entry *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
+ = (struct grub_machine_mmap_entry *) grub_absolute_pointer (GRUB_MEMORY_MACHINE_SCRATCH_ADDR);
int e820_works = 0;
while (1)
diff --git a/grub-core/loader/multiboot_mbi2.c b/grub-core/loader/multiboot_mbi2.c
index 6d680d671..00a48413c 100644
--- a/grub-core/loader/multiboot_mbi2.c
+++ b/grub-core/loader/multiboot_mbi2.c
@@ -504,7 +504,7 @@ static void
fill_vbe_tag (struct multiboot_tag_vbe *tag)
{
grub_vbe_status_t status;
- void *scratch = (void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
+ void *scratch = grub_absolute_pointer (GRUB_MEMORY_MACHINE_SCRATCH_ADDR);
tag->type = MULTIBOOT_TAG_TYPE_VBE;
tag->size = 0;
@@ -577,7 +577,7 @@ retrieve_video_parameters (grub_properly_aligned_t **ptrorig)
#if defined (GRUB_MACHINE_PCBIOS)
{
grub_vbe_status_t status;
- void *scratch = (void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
+ void *scratch = grub_absolute_pointer (GRUB_MEMORY_MACHINE_SCRATCH_ADDR);
status = grub_vbe_bios_get_mode (scratch);
vbe_mode = *(grub_uint32_t *) scratch;
if (status != GRUB_VBE_STATUS_OK)
diff --git a/grub-core/mmap/i386/pc/mmap.c b/grub-core/mmap/i386/pc/mmap.c
index 6ab4f6730..b9c5b0a00 100644
--- a/grub-core/mmap/i386/pc/mmap.c
+++ b/grub-core/mmap/i386/pc/mmap.c
@@ -80,13 +80,13 @@ preboot (int noreturn __attribute__ ((unused)))
= min (grub_mmap_get_post64 (), 0xfc000000ULL) >> 16;
/* Correct BDA. */
- *((grub_uint16_t *) 0x413) = grub_mmap_get_lower () >> 10;
+ *((grub_uint16_t *) grub_absolute_pointer (0x413)) = grub_mmap_get_lower () >> 10;
/* Save old interrupt handlers. */
- grub_machine_mmaphook_int12offset = *((grub_uint16_t *) 0x48);
- grub_machine_mmaphook_int12segment = *((grub_uint16_t *) 0x4a);
- grub_machine_mmaphook_int15offset = *((grub_uint16_t *) 0x54);
- grub_machine_mmaphook_int15segment = *((grub_uint16_t *) 0x56);
+ grub_machine_mmaphook_int12offset = *((grub_uint16_t *) grub_absolute_pointer (0x48));
+ grub_machine_mmaphook_int12segment = *((grub_uint16_t *) grub_absolute_pointer (0x4a));
+ grub_machine_mmaphook_int15offset = *((grub_uint16_t *) grub_absolute_pointer (0x54));
+ grub_machine_mmaphook_int15segment = *((grub_uint16_t *) grub_absolute_pointer (0x56));
grub_dprintf ("mmap", "hooktarget = %p\n", hooktarget);
@@ -94,11 +94,11 @@ preboot (int noreturn __attribute__ ((unused)))
grub_memcpy (hooktarget, &grub_machine_mmaphook_start,
&grub_machine_mmaphook_end - &grub_machine_mmaphook_start);
- *((grub_uint16_t *) 0x4a) = ((grub_addr_t) hooktarget) >> 4;
- *((grub_uint16_t *) 0x56) = ((grub_addr_t) hooktarget) >> 4;
- *((grub_uint16_t *) 0x48) = &grub_machine_mmaphook_int12
+ *((grub_uint16_t *) grub_absolute_pointer (0x4a)) = ((grub_addr_t) hooktarget) >> 4;
+ *((grub_uint16_t *) grub_absolute_pointer (0x56)) = ((grub_addr_t) hooktarget) >> 4;
+ *((grub_uint16_t *) grub_absolute_pointer (0x48)) = &grub_machine_mmaphook_int12
- &grub_machine_mmaphook_start;
- *((grub_uint16_t *) 0x54) = &grub_machine_mmaphook_int15
+ *((grub_uint16_t *) grub_absolute_pointer (0x54)) = &grub_machine_mmaphook_int15
- &grub_machine_mmaphook_start;
return GRUB_ERR_NONE;
@@ -108,10 +108,10 @@ static grub_err_t
preboot_rest (void)
{
/* Restore old interrupt handlers. */
- *((grub_uint16_t *) 0x48) = grub_machine_mmaphook_int12offset;
- *((grub_uint16_t *) 0x4a) = grub_machine_mmaphook_int12segment;
- *((grub_uint16_t *) 0x54) = grub_machine_mmaphook_int15offset;
- *((grub_uint16_t *) 0x56) = grub_machine_mmaphook_int15segment;
+ *((grub_uint16_t *) grub_absolute_pointer (0x48)) = grub_machine_mmaphook_int12offset;
+ *((grub_uint16_t *) grub_absolute_pointer (0x4a)) = grub_machine_mmaphook_int12segment;
+ *((grub_uint16_t *) grub_absolute_pointer (0x54)) = grub_machine_mmaphook_int15offset;
+ *((grub_uint16_t *) grub_absolute_pointer (0x56)) = grub_machine_mmaphook_int15segment;
return GRUB_ERR_NONE;
}
diff --git a/grub-core/net/drivers/i386/pc/pxe.c b/grub-core/net/drivers/i386/pc/pxe.c
index 997010cf1..db17186ee 100644
--- a/grub-core/net/drivers/i386/pc/pxe.c
+++ b/grub-core/net/drivers/i386/pc/pxe.c
@@ -174,7 +174,7 @@ grub_pxe_recv (struct grub_net_card *dev __attribute__ ((unused)))
grub_uint8_t *ptr, *end;
struct grub_net_buff *buf;
- isr = (void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
+ isr = (void *) grub_absolute_pointer (GRUB_MEMORY_MACHINE_SCRATCH_ADDR);
if (!in_progress)
{
@@ -256,11 +256,11 @@ grub_pxe_send (struct grub_net_card *dev __attribute__ ((unused)),
struct grub_pxe_undi_tbd *tbd;
char *buf;
- trans = (void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
+ trans = (void *) grub_absolute_pointer (GRUB_MEMORY_MACHINE_SCRATCH_ADDR);
grub_memset (trans, 0, sizeof (*trans));
- tbd = (void *) (GRUB_MEMORY_MACHINE_SCRATCH_ADDR + 128);
+ tbd = (void *) grub_absolute_pointer (GRUB_MEMORY_MACHINE_SCRATCH_ADDR + 128);
grub_memset (tbd, 0, sizeof (*tbd));
- buf = (void *) (GRUB_MEMORY_MACHINE_SCRATCH_ADDR + 256);
+ buf = (void *) grub_absolute_pointer (GRUB_MEMORY_MACHINE_SCRATCH_ADDR + 256);
grub_memcpy (buf, pack->data, pack->tail - pack->data);
trans->tbd = SEGOFS ((grub_addr_t) tbd);
@@ -287,7 +287,7 @@ static grub_err_t
grub_pxe_open (struct grub_net_card *dev __attribute__ ((unused)))
{
struct grub_pxe_undi_open *ou;
- ou = (void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
+ ou = (void *) grub_absolute_pointer (GRUB_MEMORY_MACHINE_SCRATCH_ADDR);
grub_memset (ou, 0, sizeof (*ou));
ou->pkt_filter = 4;
grub_pxe_call (GRUB_PXENV_UNDI_OPEN, ou, pxe_rm_entry);
@@ -382,7 +382,7 @@ GRUB_MOD_INIT(pxe)
if (! pxenv)
return;
- ui = (void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
+ ui = (void *) grub_absolute_pointer (GRUB_MEMORY_MACHINE_SCRATCH_ADDR);
grub_memset (ui, 0, sizeof (*ui));
grub_pxe_call (GRUB_PXENV_UNDI_GET_INFORMATION, ui, pxe_rm_entry);
diff --git a/grub-core/term/i386/pc/console.c b/grub-core/term/i386/pc/console.c
index d44937c30..9403390f1 100644
--- a/grub-core/term/i386/pc/console.c
+++ b/grub-core/term/i386/pc/console.c
@@ -238,12 +238,11 @@ grub_console_getkey (struct grub_term_input *term __attribute__ ((unused)))
return (regs.eax & 0xff) + (('a' - 1) | GRUB_TERM_CTRL);
}
-static const struct grub_machine_bios_data_area *bios_data_area =
- (struct grub_machine_bios_data_area *) GRUB_MEMORY_MACHINE_BIOS_DATA_AREA_ADDR;
-
static int
grub_console_getkeystatus (struct grub_term_input *term __attribute__ ((unused)))
{
+ const struct grub_machine_bios_data_area *bios_data_area =
+ (struct grub_machine_bios_data_area *) grub_absolute_pointer (GRUB_MEMORY_MACHINE_BIOS_DATA_AREA_ADDR);
/* conveniently GRUB keystatus is modelled after BIOS one. */
return bios_data_area->keyboard_flag_lower & ~0x80;
}
diff --git a/grub-core/term/i386/pc/vga_text.c b/grub-core/term/i386/pc/vga_text.c
index 88fecc5ea..669d06fad 100644
--- a/grub-core/term/i386/pc/vga_text.c
+++ b/grub-core/term/i386/pc/vga_text.c
@@ -45,15 +45,15 @@ GRUB_MOD_LICENSE ("GPLv3+");
static struct grub_term_coordinate grub_curr_pos;
#ifdef __mips__
-#define VGA_TEXT_SCREEN ((grub_uint16_t *) 0xb00b8000)
+#define VGA_TEXT_SCREEN ((grub_uint16_t *) grub_absolute_pointer (0xb00b8000))
#define cr_read grub_vga_cr_read
#define cr_write grub_vga_cr_write
#elif defined (MODE_MDA)
-#define VGA_TEXT_SCREEN ((grub_uint16_t *) 0xb0000)
+#define VGA_TEXT_SCREEN ((grub_uint16_t *) grub_absolute_pointer (0xb0000))
#define cr_read grub_vga_cr_bw_read
#define cr_write grub_vga_cr_bw_write
#else
-#define VGA_TEXT_SCREEN ((grub_uint16_t *) 0xb8000)
+#define VGA_TEXT_SCREEN ((grub_uint16_t *) grub_absolute_pointer (0xb8000))
#define cr_read grub_vga_cr_read
#define cr_write grub_vga_cr_write
#endif
diff --git a/grub-core/term/ns8250.c b/grub-core/term/ns8250.c
index 59801839b..83b25990c 100644
--- a/grub-core/term/ns8250.c
+++ b/grub-core/term/ns8250.c
@@ -28,7 +28,6 @@
#ifdef GRUB_MACHINE_PCBIOS
#include <grub/machine/memory.h>
-static const unsigned short *serial_hw_io_addr = (const unsigned short *) GRUB_MEMORY_MACHINE_BIOS_DATA_AREA_ADDR;
#define GRUB_SERIAL_PORT_NUM 4
#else
#include <grub/machine/serial.h>
@@ -237,6 +236,9 @@ static struct grub_serial_port com_ports[GRUB_SERIAL_PORT_NUM];
void
grub_ns8250_init (void)
{
+#ifdef GRUB_MACHINE_PCBIOS
+ const unsigned short *serial_hw_io_addr = (const unsigned short *) grub_absolute_pointer (GRUB_MEMORY_MACHINE_BIOS_DATA_AREA_ADDR);
+#endif
unsigned i;
for (i = 0; i < GRUB_SERIAL_PORT_NUM; i++)
if (serial_hw_io_addr[i])
@@ -272,6 +274,9 @@ grub_ns8250_init (void)
grub_port_t
grub_ns8250_hw_get_port (const unsigned int unit)
{
+#ifdef GRUB_MACHINE_PCBIOS
+ const unsigned short *serial_hw_io_addr = (const unsigned short *) grub_absolute_pointer (GRUB_MEMORY_MACHINE_BIOS_DATA_AREA_ADDR);
+#endif
if (unit < GRUB_SERIAL_PORT_NUM
&& !(dead_ports & (1 << unit)))
return serial_hw_io_addr[unit];
diff --git a/grub-core/video/i386/pc/vbe.c b/grub-core/video/i386/pc/vbe.c
index 0e65b5206..a0bb9af09 100644
--- a/grub-core/video/i386/pc/vbe.c
+++ b/grub-core/video/i386/pc/vbe.c
@@ -514,7 +514,7 @@ grub_vbe_probe (struct grub_vbe_info_block *info_block)
/* Use low memory scratch area as temporary storage
for VESA BIOS call. */
- vbe_ib = (struct grub_vbe_info_block *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
+ vbe_ib = (struct grub_vbe_info_block *) grub_absolute_pointer (GRUB_MEMORY_MACHINE_SCRATCH_ADDR);
/* Prepare info block. */
grub_memset (vbe_ib, 0, sizeof (*vbe_ib));
@@ -574,7 +574,7 @@ grub_vbe_get_preferred_mode (unsigned int *width, unsigned int *height)
/* Use low memory scratch area as temporary storage for VESA BIOS calls. */
flat_panel_info = (struct grub_vbe_flat_panel_info *)
- (GRUB_MEMORY_MACHINE_SCRATCH_ADDR + sizeof (struct grub_video_edid_info));
+ grub_absolute_pointer (GRUB_MEMORY_MACHINE_SCRATCH_ADDR + sizeof (struct grub_video_edid_info));
if (controller_info.version >= 0x200
&& (grub_vbe_bios_get_ddc_capabilities (&ddc_level) & 0xff)
@@ -676,7 +676,7 @@ grub_vbe_set_video_mode (grub_uint32_t vbe_mode,
== GRUB_VBE_MEMORY_MODEL_PACKED_PIXEL)
{
struct grub_vbe_palette_data *palette
- = (struct grub_vbe_palette_data *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
+ = (struct grub_vbe_palette_data *) grub_absolute_pointer (GRUB_MEMORY_MACHINE_SCRATCH_ADDR);
unsigned i;
/* Make sure that the BIOS can reach the palette. */
diff --git a/include/grub/types.h b/include/grub/types.h
index 0a3ff1591..5ae0ced38 100644
--- a/include/grub/types.h
+++ b/include/grub/types.h
@@ -340,4 +340,28 @@ static inline void grub_set_unaligned64 (void *ptr, grub_uint64_t val)
dd->d = val;
}
+/*
+ * The grub_absolute_pointer() macro borrows the idea from Linux kernel of using
+ * RELOC_HIDE() macro to stop GCC from checking the result of pointer arithmetic
+ * and also it's conversion to be inside the symbol's boundary [1]. The check
+ * is sometimes false positive, especially it is controversial to emit the array
+ * bounds [-Warray-bounds] warning on all hardwired literal pointers since GCC
+ * 11/12 [2]. Unless a good solution can be settled, for the time being we
+ * would be in favor of the macro instead of GCC pragmas which cannot match the
+ * places the warning needs to be ignored in an exact way.
+ *
+ * [1] https://lists.linuxcoding.com/kernel/2006-q3/msg17979.html
+ * [2] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99578
+ */
+#if defined(__GNUC__)
+# define grub_absolute_pointer(val) \
+({ \
+ grub_addr_t __ptr; \
+ asm ("" : "=r" (__ptr) : "0" ((void *) (val))); \
+ (void *) (__ptr); \
+})
+#else
+# define grub_absolute_pointer(val) ((void *) (val))
+#endif
+
#endif /* ! GRUB_TYPES_HEADER */
diff --git a/grub-core/loader/i386/multiboot_mbi.c b/grub-core/loader/i386/multiboot_mbi.c
index a67d9d0a8..434e694ff 100644
--- a/grub-core/loader/i386/multiboot_mbi.c
+++ b/grub-core/loader/i386/multiboot_mbi.c
@@ -293,7 +293,7 @@ fill_vbe_info (struct multiboot_info *mbi, grub_uint8_t *ptrorig,
struct grub_vbe_mode_info_block *mode_info;
#if GRUB_MACHINE_HAS_VBE
grub_vbe_status_t status;
- void *scratch = (void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
+ void *scratch = grub_absolute_pointer (GRUB_MEMORY_MACHINE_SCRATCH_ADDR);
status = grub_vbe_bios_get_controller_info (scratch);
if (status != GRUB_VBE_STATUS_OK)
diff --git a/grub-core/commands/i386/pc/sendkey.c b/grub-core/commands/i386/pc/sendkey.c
index 26d9acd3d..9fbd8cb2c 100644
--- a/grub-core/commands/i386/pc/sendkey.c
+++ b/grub-core/commands/i386/pc/sendkey.c
@@ -216,12 +216,12 @@ static grub_err_t
grub_sendkey_postboot (void)
{
/* For convention: pointer to flags. */
- grub_uint32_t *flags = (grub_uint32_t *) 0x417;
+ grub_uint32_t *flags = grub_absolute_pointer (0x417);
*flags = oldflags;
- *((char *) 0x41a) = 0x1e;
- *((char *) 0x41c) = 0x1e;
+ *((volatile char *) grub_absolute_pointer (0x41a)) = 0x1e;
+ *((volatile char *) grub_absolute_pointer (0x41c)) = 0x1e;
return GRUB_ERR_NONE;
}
@@ -231,13 +231,13 @@ static grub_err_t
grub_sendkey_preboot (int noret __attribute__ ((unused)))
{
/* For convention: pointer to flags. */
- grub_uint32_t *flags = (grub_uint32_t *) 0x417;
+ grub_uint32_t *flags = grub_absolute_pointer (0x417);
oldflags = *flags;
/* Set the sendkey. */
- *((char *) 0x41a) = 0x1e;
- *((char *) 0x41c) = keylen + 0x1e;
+ *((volatile char *) grub_absolute_pointer (0x41a)) = 0x1e;
+ *((volatile char *) grub_absolute_pointer (0x41c)) = keylen + 0x1e;
grub_memcpy ((char *) 0x41e, sendkey, 0x20);
/* Transform "any ctrl" to "right ctrl" flag. */
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