u-boot/arch/arm/include/asm/global_data.h
Jeroen Hofstee c65a2abb6c ARM: make gd a function for clang
"clang does not support global register variables; this is
unlikely to be implemented soon because it requires additional
LLVM backend support" [1]

Workaround it by obtaining the value of gd/r9 by an inline
asm routine. Note there is no set routine added for ARM at the
moment, since most if not all updates of gd from c are actually
not needed for ARM.

[1] http://clang.llvm.org/docs/UsersManual.html

cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Signed-off-by: Jeroen Hofstee <jeroen@myspectrum.nl>
2014-09-09 13:51:08 +02:00

78 lines
1.7 KiB
C

/*
* (C) Copyright 2002-2010
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __ASM_GBL_DATA_H
#define __ASM_GBL_DATA_H
#ifdef CONFIG_OMAP
#include <asm/omap_boot.h>
#endif
/* Architecture-specific global data */
struct arch_global_data {
#if defined(CONFIG_FSL_ESDHC)
u32 sdhc_clk;
#endif
#ifdef CONFIG_AT91FAMILY
/* "static data" needed by at91's clock.c */
unsigned long cpu_clk_rate_hz;
unsigned long main_clk_rate_hz;
unsigned long mck_rate_hz;
unsigned long plla_rate_hz;
unsigned long pllb_rate_hz;
unsigned long at91_pllb_usb_init;
#endif
/* "static data" needed by most of timer.c on ARM platforms */
unsigned long timer_rate_hz;
unsigned long tbu;
unsigned long tbl;
unsigned long lastinc;
unsigned long long timer_reset_value;
#if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
unsigned long tlb_addr;
unsigned long tlb_size;
#endif
#ifdef CONFIG_OMAP
struct omap_boot_parameters omap_boot_params;
#endif
};
#include <asm-generic/global_data.h>
#ifdef __clang__
#define DECLARE_GLOBAL_DATA_PTR
#define gd get_gd()
static inline gd_t *get_gd(void)
{
gd_t *gd_ptr;
#ifdef CONFIG_ARM64
/*
* Make will already error that reserving x18 is not supported at the
* time of writing, clang: error: unknown argument: '-ffixed-x18'
*/
__asm__ volatile("mov %0, x18\n" : "=r" (gd_ptr));
#else
__asm__ volatile("mov %0, r9\n" : "=r" (gd_ptr));
#endif
return gd_ptr;
}
#else
#ifdef CONFIG_ARM64
#define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm ("x18")
#else
#define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm ("r9")
#endif
#endif
#endif /* __ASM_GBL_DATA_H */