sandbox: use sections instead of symbols for getopt array boundaries

In style of linked lists, instead of declaring symbols for boundaries
of getopt options array in the linker script, declare corresponding
sections and retrieve the boundaries via static inline functions.

Without this clang's LTO produces binary without any getopt options,
because for some reason it thinks that array is empty (start and end
symbols are at the same address).

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Simon Glass <sjg@chromium.org>

5 files changed, 32 insertions, 11 deletions

diff --git a/arch/sandbox/cpu/os.c b/arch/sandbox/cpu/os.c
index b9ad341..0d21827 100644
--- a/arch/sandbox/cpu/os.c
+++ b/arch/sandbox/cpu/os.c
@@ -375,7 +375,8 @@ static struct option *long_opts;
 
 int os_parse_args(struct sandbox_state *state, int argc, char *argv[])
 {
-	struct sandbox_cmdline_option **sb_opt = __u_boot_sandbox_option_start;
+	struct sandbox_cmdline_option **sb_opt =
+		__u_boot_sandbox_option_start();
 	size_t num_options = __u_boot_sandbox_option_count();
 	size_t i;
 
diff --git a/arch/sandbox/cpu/start.c b/arch/sandbox/cpu/start.c
index e87365e..63ca514 100644
--- a/arch/sandbox/cpu/start.c
+++ b/arch/sandbox/cpu/start.c
@@ -58,7 +58,8 @@ static int h_compare_opt(const void *p1, const void *p2)
 int sandbox_early_getopt_check(void)
 {
 	struct sandbox_state *state = state_get_current();
-	struct sandbox_cmdline_option **sb_opt = __u_boot_sandbox_option_start;
+	struct sandbox_cmdline_option **sb_opt =
+		__u_boot_sandbox_option_start();
 	size_t num_options = __u_boot_sandbox_option_count();
 	size_t i;
 	int max_arg_len, max_noarg_len;
diff --git a/arch/sandbox/cpu/u-boot-spl.lds b/arch/sandbox/cpu/u-boot-spl.lds
index 1816043..6754f4e 100644
--- a/arch/sandbox/cpu/u-boot-spl.lds
+++ b/arch/sandbox/cpu/u-boot-spl.lds
@@ -21,9 +21,11 @@ SECTIONS
 		__priv_data_end = .;
 	}
 
-	__u_boot_sandbox_option_start = .;
-	_u_boot_sandbox_getopt : { KEEP(*(.u_boot_sandbox_getopt)) }
-	__u_boot_sandbox_option_end = .;
+	_u_boot_sandbox_getopt : {
+		*(.u_boot_sandbox_getopt_start)
+		KEEP(*(.u_boot_sandbox_getopt))
+		*(.u_boot_sandbox_getopt_end)
+	}
 }
 
 INSERT AFTER .data;
diff --git a/arch/sandbox/cpu/u-boot.lds b/arch/sandbox/cpu/u-boot.lds
index a1f509c..6d71061 100644
--- a/arch/sandbox/cpu/u-boot.lds
+++ b/arch/sandbox/cpu/u-boot.lds
@@ -13,9 +13,11 @@ SECTIONS
 		KEEP(*(SORT(.u_boot_list*)));
 	}
 
-	__u_boot_sandbox_option_start = .;
-	_u_boot_sandbox_getopt : { *(.u_boot_sandbox_getopt) }
-	__u_boot_sandbox_option_end = .;
+	_u_boot_sandbox_getopt : {
+		*(.u_boot_sandbox_getopt_start)
+		*(.u_boot_sandbox_getopt)
+		*(.u_boot_sandbox_getopt_end)
+	}
 
 	.__efi_runtime_start : {
 		*(.__efi_runtime_start)
diff --git a/arch/sandbox/include/asm/sections.h b/arch/sandbox/include/asm/sections.h
index fbc1bd1..f4351ae 100644
--- a/arch/sandbox/include/asm/sections.h
+++ b/arch/sandbox/include/asm/sections.h
@@ -13,12 +13,27 @@
 
 struct sandbox_cmdline_option;
 
-extern struct sandbox_cmdline_option *__u_boot_sandbox_option_start[],
-	*__u_boot_sandbox_option_end[];
+static inline struct sandbox_cmdline_option **
+__u_boot_sandbox_option_start(void)
+{
+	static char start[0] __aligned(4) __attribute__((unused))
+		__section(".u_boot_sandbox_getopt_start");
+
+	return (struct sandbox_cmdline_option **)&start;
+}
+
+static inline struct sandbox_cmdline_option **
+__u_boot_sandbox_option_end(void)
+{
+	static char end[0] __aligned(4) __attribute__((unused))
+		__section(".u_boot_sandbox_getopt_end");
+
+	return (struct sandbox_cmdline_option **)&end;
+}
 
 static inline size_t __u_boot_sandbox_option_count(void)
 {
-	return __u_boot_sandbox_option_end - __u_boot_sandbox_option_start;
+	return __u_boot_sandbox_option_end() - __u_boot_sandbox_option_start();
 }
 
 #endif