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https://github.com/brain-hackers/u-boot-brain
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980d6a5511
Until now we've been using memory beyond psci_text_end as stack space
for the secure monitor or PSCI implementation, even if space was not
allocated for it.
This was partially fixed in ("ARM: allocate extra space for PSCI stack
in secure section during link phase"). However, calculating stack space
from psci_text_end in one place, while allocating the space in another
is error prone.
This patch adds a separate empty secure stack section, with space for
CONFIG_ARMV7_PSCI_NR_CPUS stacks, each 1 KB. There's also
__secure_stack_start and __secure_stack_end symbols. The linker script
handles calculating the correct VMAs for the stack section. For
platforms that relocate/copy the secure monitor before using it, the
space is not allocated in the executable, saving space.
For platforms that do not define CONFIG_ARMV7_PSCI_NR_CPUS, a whole page
of stack space for 4 CPUs is allocated, matching the previous behavior.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
37 lines
1.8 KiB
C
37 lines
1.8 KiB
C
/*
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* Copyright 2013 Albert ARIBAUD <albert.u.boot@aribaud.net>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/**
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* These two symbols are declared in a C file so that the linker
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* uses R_ARM_RELATIVE relocation, rather than the R_ARM_ABS32 one
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* it would use if the symbols were defined in the linker file.
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* Using only R_ARM_RELATIVE relocation ensures that references to
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* the symbols are correct after as well as before relocation.
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*
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* We need a 0-byte-size type for these symbols, and the compiler
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* does not allow defining objects of C type 'void'. Using an empty
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* struct is allowed by the compiler, but causes gcc versions 4.4 and
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* below to complain about aliasing. Therefore we use the next best
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* thing: zero-sized arrays, which are both 0-byte-size and exempt from
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* aliasing warnings.
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*/
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char __bss_start[0] __attribute__((section(".__bss_start")));
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char __bss_end[0] __attribute__((section(".__bss_end")));
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char __image_copy_start[0] __attribute__((section(".__image_copy_start")));
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char __image_copy_end[0] __attribute__((section(".__image_copy_end")));
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char __rel_dyn_start[0] __attribute__((section(".__rel_dyn_start")));
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char __rel_dyn_end[0] __attribute__((section(".__rel_dyn_end")));
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char __secure_start[0] __attribute__((section(".__secure_start")));
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char __secure_end[0] __attribute__((section(".__secure_end")));
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char __secure_stack_start[0] __attribute__((section(".__secure_stack_start")));
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char __secure_stack_end[0] __attribute__((section(".__secure_stack_end")));
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char __efi_runtime_start[0] __attribute__((section(".__efi_runtime_start")));
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char __efi_runtime_stop[0] __attribute__((section(".__efi_runtime_stop")));
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char __efi_runtime_rel_start[0] __attribute__((section(".__efi_runtime_rel_start")));
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char __efi_runtime_rel_stop[0] __attribute__((section(".__efi_runtime_rel_stop")));
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char _end[0] __attribute__((section(".__end")));
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