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authorChen-Yu Tsai <wens@csie.org>2016-06-19 12:38:36 +0800
committerHans de Goede <hdegoede@redhat.com>2016-07-15 15:54:57 +0200
commit980d6a55119f757ade4abed88bf4b2b7494c68e6 (patch)
treef11b15b64c4a0a4a303178c68cf281232d416e2c /arch/arm/lib/sections.c
parentdbf38aabd9f4d4fd4d9bd4eeeba88e0e47dcb27c (diff)
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ARM: Add an empty secure stack section
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>
Diffstat (limited to 'arch/arm/lib/sections.c')
-rw-r--r--arch/arm/lib/sections.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/lib/sections.c b/arch/arm/lib/sections.c
index 6a94522..952e8ae 100644
--- a/arch/arm/lib/sections.c
+++ b/arch/arm/lib/sections.c
@@ -27,6 +27,8 @@ char __rel_dyn_start[0] __attribute__((section(".__rel_dyn_start")));
char __rel_dyn_end[0] __attribute__((section(".__rel_dyn_end")));
char __secure_start[0] __attribute__((section(".__secure_start")));
char __secure_end[0] __attribute__((section(".__secure_end")));
+char __secure_stack_start[0] __attribute__((section(".__secure_stack_start")));
+char __secure_stack_end[0] __attribute__((section(".__secure_stack_end")));
char __efi_runtime_start[0] __attribute__((section(".__efi_runtime_start")));
char __efi_runtime_stop[0] __attribute__((section(".__efi_runtime_stop")));
char __efi_runtime_rel_start[0] __attribute__((section(".__efi_runtime_rel_start")));