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Diffstat (limited to 'ports/risc-v64/gnu/example_build/erbium/entry.S')
| -rw-r--r-- | ports/risc-v64/gnu/example_build/erbium/entry.S | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/ports/risc-v64/gnu/example_build/erbium/entry.S b/ports/risc-v64/gnu/example_build/erbium/entry.S new file mode 100644 index 00000000..201f986e --- /dev/null +++ b/ports/risc-v64/gnu/example_build/erbium/entry.S @@ -0,0 +1,50 @@ +/*************************************************************************** + * Copyright (c) 2026 Eclipse ThreadX contributors + * + * This program and the accompanying materials are made available under the + * terms of the MIT License which is available at + * https://opensource.org/licenses/MIT. + * + * AI Disclosure: This file was largely AI-generated by Claude Code (Opus 5.5). + * The AI-generated portions may be considered public domain (CC0-1.0) + * and not subject to the project's licence. The human contributor has + * reviewed and verified that the code is correct. + * + * SPDX-License-Identifier: MIT and CC0-1.0 + **************************************************************************/ + +/* Reset entry for the Erbium example. Hart 0 sets up the global pointer, + the system stack and .bss, then calls main(). Any other hart is parked. */ + + .section .text.entry, "ax", @progbits + .align 2 + .global _start + .extern main + .extern _sysstack_end + .extern _bss_start + .extern _bss_end +_start: + csrr t0, mhartid + bnez t0, _park + +.option push +.option norelax + la gp, __global_pointer$ // norelax keeps this load absolute +.option pop + + la sp, _sysstack_end + + la t0, _bss_start // .bss is 16-byte aligned in link.lds + la t1, _bss_end +_bss_clear: + bgeu t0, t1, _bss_done + sd zero, 0(t0) + addi t0, t0, 8 + j _bss_clear +_bss_done: + + call main + + /* The example never executes WFI; a parked hart spins. */ +_park: + j _park |