| // Copyright 2025 The Pigweed Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| // use this file except in compliance with the License. You may obtain a copy of |
| // the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| // License for the specific language governing permissions and limitations under |
| // the License. |
| |
| .cfi_sections .debug_frame |
| .section .text.entrypoint, "ax", %progbits |
| .global _start |
| .type _start, %function |
| .cfi_startproc |
| |
| _start: |
| mv s4, a0 // save arg 0 to s4 |
| // Static-init RAM (load static values into RAM, .data section init). |
| // RAM is 4 byte aligned. |
| la a0, _pw_static_init_ram_start // destination (RAM) |
| la a1, _pw_static_init_flash_start // source (Flash) |
| la t0, _pw_static_init_ram_end // end destination (RAM) |
| sub a2, t0, a0 // number of bytes to memcpy |
| call memcpy |
| |
| // Zero-init RAM (.bss section init). |
| la a0, _pw_zero_init_ram_start // destination (RAM) |
| li a1, 0 // value to write (0) |
| la t0, _pw_zero_init_ram_end // end destination (RAM) |
| sub a2, t0, a0 // number of bytes to memset |
| call memset |
| |
| // Memory is initialized, now call the applications main entry function. |
| mv a0, s4 |
| call main |
| |
| // Trap if main returns, which it never should. |
| unimp |
| .cfi_endproc |
| .size _start, . - _start |
