update linkerscript to include unwinding-related sections

Author: tropicaaal

compiler/rustc_target/src/spec/targets/armv7a_vex_v5_linker_script.ld

@@ -1,34 +1,40 @@
 OUTPUT_FORMAT("elf32-littlearm")
 
-ENTRY(_start)
+ENTRY(_boot)
 
 __user_ram_start = 0x03800000;
 __user_ram_length = 0x04800000;
 __user_ram_end = __user_ram_start + __user_ram_length;
 
-MEMORY {
-    USER_RAM : ORIGIN = __user_ram_start, LENGTH = __user_ram_length
-}
+__code_signature_length = 0x20;
 
 __stack_length = 0x400000;
 __heap_end = __user_ram_end - __stack_length;
 
+__eh_frame_hdr_start = SIZEOF(.eh_frame_hdr) > 0 ? ADDR(.eh_frame_hdr) : 0;
+__eh_frame_hdr_end = SIZEOF(.eh_frame_hdr) > 0 ? . : 0;
+
+MEMORY {
+    USER_RAM : ORIGIN = __user_ram_start, LENGTH = __user_ram_length
+}
+
 SECTIONS {
-    .text : {
-        __text_start = .;
+    .code_signature : {
         KEEP(*(.code_signature))
-        . = __text_start + 0x20;
+        . = __user_ram_start + __code_signature_length;
+    } > USER_RAM
+
+    .text : {
         *(.boot)
         *(.text .text.*)
-    } > USER_RAM = 0
+    } > USER_RAM
 
-    .rodata1 : {
-        *(.rodata1 .rodata1.*)
+    .rodata : {
+        *(.rodata .rodata.*)
     } > USER_RAM
 
     .data : {
         *(.data .data.*)
-        *(.data1 .data1.*)
     } > USER_RAM
 
     .bss : {
@@ -37,6 +43,30 @@ SECTIONS {
         __bss_end = .;
     } > USER_RAM
 
+    /* The unwind tables enabled by "default-uwtable" in the target file live here. */
+    /* __eh_frame_start and similar symbols are used by libunwind. */
+    .eh_frame_hdr : {
+        KEEP(*(.eh_frame_hdr))
+    } > USER_RAM
+
+    .eh_frame : {
+        __eh_frame_start = .;
+       KEEP(*(.eh_frame))
+        __eh_frame_end = .;
+    } > USER_RAM
+
+    .ARM.exidx : {
+        __exidx_start = .;
+        *(.ARM.exidx*)
+        __exidx_end = .;
+    } > USER_RAM
+
+    .ARM.extab : {
+        __extab_start = .;
+        *(.ARM.extab*)
+        __extab_end = .;
+    } > USER_RAM
+
     .heap (NOLOAD) : ALIGN(4) {
         __heap_start = .;
         . = __heap_end;
@@ -49,6 +79,6 @@ SECTIONS {
     } > USER_RAM
 
     /DISCARD/ : {
-        *(.ARM.exidx)
+        *(.ARM.attributes*)
     }
 }