| Sam Elliott | 120c737 | 2020-11-03 15:14:46 +0000 | [diff] [blame^] | 1 | /* Copyright lowRISC contributors. */ |
| 2 | /* Licensed under the Apache License, Version 2.0, see LICENSE for details. */ |
| 3 | /* SPDX-License-Identifier: Apache-2.0 */ |
| 4 | |
| 5 | /** |
| 6 | * Partial Linker Script for OpenTitan Device Executables |
| 7 | * |
| 8 | * This Linker Script controls all the sections that we need in the ELF file for |
| 9 | * a device executable, but which are not mapped into memory or otherwise |
| 10 | * allocated on the device itself. |
| 11 | * |
| 12 | * These contain amongst other things: |
| 13 | * - debugging information needed by DV logging, |
| 14 | * - DWARF Sections |
| 15 | * - RISC-V Attributes sections |
| 16 | * |
| 17 | * This is also where we specify the sections to discard, because it is a common |
| 18 | * file between all our other linker scripts. |
| 19 | * |
| 20 | * This partial linker script requires the main linker script to define the |
| 21 | * following symbols: |
| 22 | * - _dv_log_offset |
| 23 | */ |
| 24 | |
| 25 | /* |
| 26 | * Start DV Sections. |
| 27 | * |
| 28 | * The following sections are used by DV to implement logging in an |
| 29 | * alternate way, which enables simulation speed up by completely avoiding |
| 30 | * any string format processing or even the actual transmission of log data |
| 31 | * to a real peripheral. |
| 32 | * |
| 33 | * These sections are marked as dummy so that they can still be extracted |
| 34 | * using readelf or similar utilities. As such, the content in these sections |
| 35 | * is not relevant for the actual SW code and can be safely discarded. |
| 36 | */ |
| 37 | |
| 38 | /** |
| 39 | * The following section contains log fields constructed from the logs using |
| 40 | * the log_fields_t struct defined in sw/device/lib/runtime/log.h. The size of |
| 41 | * each log field is fixed - 20 bytes. |
| 42 | */ |
| 43 | .logs.fields _dv_log_offset (INFO): { |
| 44 | *(.logs.fields) |
| 45 | } |
| 46 | |
| 47 | /* |
| 48 | * End DV Sections |
| 49 | */ |
| 50 | |
| 51 | /* ELF-internal Sections. */ |
| 52 | .symtab 0x0 : { *(.symtab) } |
| 53 | .strtab 0x0 : { *(.strtab) } |
| 54 | .shstrtab 0x0 : { *(.shstrtab) } |
| 55 | |
| 56 | /* Preserve RISC-V Attributes */ |
| 57 | .riscv.attributes 0x0 : { *(.riscv.attributes) } |
| 58 | |
| 59 | /* Preserve Debug Info in ELF Files */ |
| 60 | .debug_info 0x0 : { *(.debug_info) } |
| 61 | .debug_abbrev 0x0 : { *(.debug_abbrev) } |
| 62 | .debug_aranges 0x0 : { *(.debug_aranges) } |
| 63 | .debug_line 0x0 : { *(.debug_line) } |
| 64 | .debug_loc 0x0 : { *(.debug_loc) } |
| 65 | .debug_ranges 0x0 : { *(.debug_ranges) } |
| 66 | .debug_str 0x0 : { *(.debug_str) } |
| 67 | .debug_frame 0x0 : { *(.debug_frame) } |
| 68 | |
| 69 | /* Discarded Sections (Not needed in device images). */ |
| 70 | /DISCARD/ : { |
| 71 | /* We don't keep unwind information */ |
| 72 | *(.eh_frame) |
| 73 | *(.eh_frame_hdr) |
| 74 | |
| 75 | /* Compiler Information */ |
| 76 | *(.comment) |
| 77 | *(.comment.*) |
| 78 | |
| 79 | /* Other Notes */ |
| 80 | *(.note) |
| 81 | *(.note.*) |
| 82 | |
| 83 | /* Relocations */ |
| 84 | *(.rela.*) |
| 85 | *(.rela.dyn) |
| 86 | |
| 87 | /* STAB Debugging Info - We Use DWARF */ |
| 88 | *(.stab) |
| 89 | *(.stab.*) |
| 90 | *(.stabstr) |
| 91 | } |
