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https://github.com/brain-hackers/u-boot-brain
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c65a2abb6c
"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>
79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
/*
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* (C) Copyright 2002-2010
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __ASM_GBL_DATA_H
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#define __ASM_GBL_DATA_H
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#ifdef CONFIG_OMAP
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#include <asm/omap_boot.h>
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#endif
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/* Architecture-specific global data */
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struct arch_global_data {
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#if defined(CONFIG_FSL_ESDHC)
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u32 sdhc_clk;
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#endif
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#ifdef CONFIG_AT91FAMILY
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/* "static data" needed by at91's clock.c */
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unsigned long cpu_clk_rate_hz;
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unsigned long main_clk_rate_hz;
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unsigned long mck_rate_hz;
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unsigned long plla_rate_hz;
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unsigned long pllb_rate_hz;
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unsigned long at91_pllb_usb_init;
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#endif
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/* "static data" needed by most of timer.c on ARM platforms */
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unsigned long timer_rate_hz;
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unsigned long tbu;
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unsigned long tbl;
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unsigned long lastinc;
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unsigned long long timer_reset_value;
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#if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
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unsigned long tlb_addr;
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unsigned long tlb_size;
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#endif
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#ifdef CONFIG_OMAP
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struct omap_boot_parameters omap_boot_params;
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#endif
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};
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#include <asm-generic/global_data.h>
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#ifdef __clang__
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#define DECLARE_GLOBAL_DATA_PTR
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#define gd get_gd()
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static inline gd_t *get_gd(void)
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{
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gd_t *gd_ptr;
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#ifdef CONFIG_ARM64
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/*
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* Make will already error that reserving x18 is not supported at the
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* time of writing, clang: error: unknown argument: '-ffixed-x18'
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*/
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__asm__ volatile("mov %0, x18\n" : "=r" (gd_ptr));
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#else
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__asm__ volatile("mov %0, r9\n" : "=r" (gd_ptr));
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#endif
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return gd_ptr;
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}
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#else
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#ifdef CONFIG_ARM64
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#define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm ("x18")
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#else
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#define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm ("r9")
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#endif
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#endif
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#endif /* __ASM_GBL_DATA_H */
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