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annotate gcc/ld-script.src @ 82:6afaa5cb7392

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linker script for gcc fw build: initial version put together
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 20 Jul 2018 17:33:14 +0000
parents
children 32bcc299ef55
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82
6afaa5cb7392 linker script for gcc fw build: initial version put together
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1 dnl This ld script source is fed through m4 in order to fill in
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2 dnl those settings which depend on the configuration.
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3 dnl Two include files are fed to m4 before this main body:
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4 dnl the appropriate targets/*.m4 file defining the memory config
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5 dnl of the hardware, and one of flash.m4 or xram.m4 to select
6afaa5cb7392 linker script for gcc fw build: initial version put together
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6 dnl the build type.
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7
6afaa5cb7392 linker script for gcc fw build: initial version put together
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8 /*
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9 * FreeCalypso Selenite ld script for the Buildmem build
6afaa5cb7392 linker script for gcc fw build: initial version put together
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10 */
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11
6afaa5cb7392 linker script for gcc fw build: initial version put together
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12 ENTRY(_Firmware_boot_entry)
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13
6afaa5cb7392 linker script for gcc fw build: initial version put together
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14 MEMORY {
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15 ifelse(Buildmem-FLASH_BOOT_VIA_BOOTROM,FLASH-1,
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16 ` FLASH_OVERLAY : ORIGIN = 0, LENGTH = 0x2000')
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17 ifelse(Buildmem,FLASH,
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18 ` FLASH : ORIGIN = FLASHIMAGE_BASE_ADDR,
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19 LENGTH = CONFIG_FWFLASH_SIZE - FLASHIMAGE_BASE_ADDR')
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20 IRAM : ORIGIN = 0x00800000, LENGTH = CONFIG_IRAM_SIZE
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21 XRAM : ORIGIN = 0x01000000, LENGTH = CONFIG_XRAM_SIZE
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22 }
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23
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24 SECTIONS {
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25 dnl The following sections exist only in the flashImage build,
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26 dnl and only on targets that use the Calypso boot ROM.
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27 ifelse(Buildmem-FLASH_BOOT_VIA_BOOTROM,FLASH-1,
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28 ` /* Part of flash overlaid by the boot ROM */
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29 bootrom.overlay 0 : {
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30 *(bootrom.overlay)
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31 } > FLASH_OVERLAY
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32
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33 /* code that enables the boot ROM and jumps to it */
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34 bootrom.switch : {
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35 *(bootrom.switch)
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36 } > IRAM AT> FLASH_OVERLAY
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37 __romswitch_ram_addr = ADDR(bootrom.switch);
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38 __romswitch_flash_addr = LOADADDR(bootrom.switch);
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39 __romswitch_size = SIZEOF(bootrom.switch);
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40 ')dnl
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41
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42 /* boot entry code, going into flash or XRAM emulating flash */
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43 .inttext : {
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44 *(.inttext)
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45 } > Buildmem
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46
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47 /* copy-to-IRAM code */
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48 iram.text 0x80001C : {
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49 /* the 7 exception and interrupt vectors @ 0x80001C */
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50 *(.ramvecs)
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51 *_ir.a:(.text*)
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52 *_int.a:(.text*)
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53 *_intram.a:(.text*)
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54 *osx_na7_db.a:(.text*)
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55 *tpudrv.a:(.text*)
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56 *drivers_flash.a:niq32.o(.text*)
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57 *sim_drv.a:sim32.o(.text*)
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58 *libc.a:(.text*)
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59 *libgcc.a:(.text*)
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60 } > IRAM Put_in_flash
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61 ifelse(Buildmem,FLASH,
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62 ` __iramtext_ram_addr = ADDR(iram.text);
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63 __iramtext_flash_addr = LOADADDR(iram.text);
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64 __iramtext_size = SIZEOF(iram.text);
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65 ')dnl
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66
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67 /* XIP code, going into flash or XRAM emulating flash */
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68 xip.text : {
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69 *(.text*)
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70 /* let's put the ARM->Thumb veneers in the XIP section */
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71 *(.glue_7)
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72 } > Buildmem
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73
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74 /* all .rodata will stay in flash */
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75 .rodata : {
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76 *(.rodata*)
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77 } > Buildmem
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78
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79 /*
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80 * All .data will go into XRAM.
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81 * For the flash build we'll have a step that copies
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82 * the .data section from flash to XRAM; for the RAM-only
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83 * build it goes directly into XRAM and stays there.
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84 */
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85 .data : {
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86 *(.data*)
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87 } > XRAM Put_in_flash
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88 ifelse(Buildmem,FLASH,
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89 ` __initdata_ram_addr = ADDR(.data);
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90 __initdata_flash_addr = LOADADDR(.data);
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91 __initdata_size = SIZEOF(.data);
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92 ')dnl
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93
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94 .bss_dar (NOLOAD) : {
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95 *dar_gbl_var.a:(.bss* COMMON)
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96 } > XRAM
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97
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98 /* we have two kinds of BSS: internal and external */
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99 int.bss (NOLOAD) : {
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100 *(.l1s_global)
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101 *_ir.a:(.bss* COMMON)
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102 *_int.a:(.bss* COMMON)
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103 *_intram.a:(.bss* COMMON)
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104 *osx_na7_db.a:(.bss* COMMON)
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105 *tpudrv.a:(.bss* COMMON)
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106 *libc.a:(.bss* COMMON)
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107 *libgcc.a:(.bss* COMMON)
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108 *(.API_HISR_stack)
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109 . = ALIGN(4);
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110 } > IRAM
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111 __intbss_start = ADDR(int.bss);
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112 __intbss_size = SIZEOF(int.bss);
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113
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114 ext.bss (NOLOAD) : {
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115 *(.bss* COMMON)
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116 . = ALIGN(4);
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117 } > XRAM
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118 __extbss_start = ADDR(ext.bss);
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119 __extbss_size = SIZEOF(ext.bss);
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120
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121 .stack (NOLOAD) : {
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122 /* Leave 20 32bit words for register pushes. */
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123 . = ALIGN(8);
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124 . += 20 * 4;
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125
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126 /* Stack for abort and/or undefined modes. */
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127 _Except_Stack_SP = .;
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128
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129 /* Leave 38 32bit words for state saving on exceptions. */
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130 xdump_buffer = .;
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131 . += 38 * 4;
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132 . = ALIGN(8);
6afaa5cb7392 linker script for gcc fw build: initial version put together
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133
6afaa5cb7392 linker script for gcc fw build: initial version put together
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134 /* Beginning of stacks and heap area - 2.75 kbytes (int.s) */
6afaa5cb7392 linker script for gcc fw build: initial version put together
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135 _Stack_segment_start = .;
6afaa5cb7392 linker script for gcc fw build: initial version put together
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136 . += 0xB00;
6afaa5cb7392 linker script for gcc fw build: initial version put together
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137 _Stack_segment_end = .;
6afaa5cb7392 linker script for gcc fw build: initial version put together
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138 } > XRAM
6afaa5cb7392 linker script for gcc fw build: initial version put together
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139 }