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https://github.com/riscv-software-src/opensbi.git
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22d8ee9758
When OpenSBI is compiled as fPIE mode, the assembler will translate "la" to GOT reference pattern. It will cause to cost an additional load instruction when obtaining the symbol address. However, if the symbol locates within the positive or negative 2GB region, we can use "lla" instead of "la" to avoid unneeded GOT references. This patch assumes that the OpenSBI image excluding the payload does not exceed 2GB. Based on this assumption, all "la" instructions are replaced by "lla" to avoid performance degradation when compiling as fPIE mode. Signed-off-by: Vincent Chen <vincent.chen@sifive.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
89 lines
1.5 KiB
ArmAsm
89 lines
1.5 KiB
ArmAsm
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#include <sbi/riscv_encoding.h>
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#define __ASM_STR(x) x
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#if __riscv_xlen == 64
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#define __REG_SEL(a, b) __ASM_STR(a)
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#define RISCV_PTR .dword
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#elif __riscv_xlen == 32
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#define __REG_SEL(a, b) __ASM_STR(b)
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#define RISCV_PTR .word
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#else
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#error "Unexpected __riscv_xlen"
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#endif
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#define REG_L __REG_SEL(ld, lw)
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#define REG_S __REG_SEL(sd, sw)
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.section .entry, "ax", %progbits
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.align 3
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.globl _start
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_start:
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/* Pick one hart to run the main boot sequence */
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lla a3, _hart_lottery
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li a2, 1
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amoadd.w a3, a2, (a3)
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bnez a3, _start_hang
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/* Save a0 and a1 */
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lla a3, _boot_a0
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REG_S a0, 0(a3)
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lla a3, _boot_a1
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REG_S a1, 0(a3)
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/* Zero-out BSS */
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lla a4, _bss_start
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lla a5, _bss_end
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_bss_zero:
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REG_S zero, (a4)
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add a4, a4, __SIZEOF_POINTER__
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blt a4, a5, _bss_zero
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_start_warm:
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/* Disable and clear all interrupts */
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csrw CSR_SIE, zero
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csrw CSR_SIP, zero
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/* Setup exception vectors */
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lla a3, _start_hang
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csrw CSR_STVEC, a3
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/* Setup stack */
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lla a3, _payload_end
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li a4, 0x2000
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add sp, a3, a4
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/* Jump to C main */
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lla a3, _boot_a0
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REG_L a0, 0(a3)
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lla a3, _boot_a1
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REG_L a1, 0(a3)
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call test_main
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/* We don't expect to reach here hence just hang */
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j _start_hang
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.section .entry, "ax", %progbits
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.align 3
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.globl _start_hang
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_start_hang:
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wfi
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j _start_hang
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.section .entry, "ax", %progbits
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.align 3
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_hart_lottery:
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RISCV_PTR 0
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_boot_a0:
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RISCV_PTR 0
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_boot_a1:
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RISCV_PTR 0
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