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307666be28
Similar to AArch64's case, Clang may wrongly fold accesses to gd pointer which is defined with register qualifier into constants, breaking various components. This patch defines gd as a macro when building with Clang or LTO, which expands to get_gd() that accesses gp pointer in assembly, making RISC-V ports function properly and preparing for introduction of LTO in the future. Board initialization code is also adapted for non-assignable gd. Reported-by: Nathaniel Hourt <I@nathaniel.land> Signed-off-by: Yao Zi <ziyao@disroot.org> Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* (C) Copyright 2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* Copyright (c) 2017 Microsemi Corporation.
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* Padmarao Begari, Microsemi Corporation <padmarao.begari@microsemi.com>
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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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#include <linux/types.h>
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#include <asm/smp.h>
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#include <asm/u-boot.h>
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#include <compiler.h>
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#include <config.h>
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/* Architecture-specific global data */
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struct arch_global_data {
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long boot_hart; /* boot hart id */
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phys_addr_t firmware_fdt_addr;
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#if CONFIG_IS_ENABLED(RISCV_ACLINT)
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void __iomem *aclint; /* aclint base address */
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#endif
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#ifdef CONFIG_ANDES_PLICSW
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void __iomem *plicsw; /* andes plicsw base address */
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#endif
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#if CONFIG_IS_ENABLED(SMP)
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struct ipi_data ipi[CONFIG_NR_CPUS];
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#endif
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#if !CONFIG_IS_ENABLED(XIP)
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#ifdef CONFIG_AVAILABLE_HARTS
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ulong available_harts;
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#endif
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#endif
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#if CONFIG_IS_ENABLED(ACPI)
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ulong table_start; /* Start address of ACPI tables */
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ulong table_end; /* End address of ACPI tables */
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ulong table_start_high; /* Start address of high ACPI tables */
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ulong table_end_high; /* End address of high ACPI tables */
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#endif
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#ifdef CONFIG_SMBIOS
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ulong smbios_start; /* Start address of SMBIOS table */
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#endif
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struct resume_data *resume;
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};
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#include <asm-generic/global_data.h>
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#if defined(__clang__) || CONFIG_IS_ENABLED(LTO)
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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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__asm__ volatile ("mv %0, gp\n" : "=r" (gd_ptr));
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return gd_ptr;
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}
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#else
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#define DECLARE_GLOBAL_DATA_PTR register gd_t *gd asm ("gp")
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#endif
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static inline void set_gd(volatile gd_t *gd_ptr)
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{
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#ifdef CONFIG_64BIT
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asm volatile("ld gp, %0\n" : : "m"(gd_ptr));
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#else
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asm volatile("lw gp, %0\n" : : "m"(gd_ptr));
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#endif
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}
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#endif /* __ASM_GBL_DATA_H */
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