Re: [Qemu-devel] [PATCH] qemu-i386 segfaults running "hello world".

[Alexander Graf]

Hi,

this is the patch we are currently using to build qemu-0.9.0. Does this
work for you?

Alex

--- i386.ld
+++ i386.ld
@@ -1,116 +1,164 @@
-/* ld script to make i386 Linux kernel
- * Written by Martin Mares <address@hidden>;
- */
-OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
+/* Default linker script, for normal executables */
+OUTPUT_FORMAT("elf32-i386", "elf32-i386",
+             "elf32-i386")
 OUTPUT_ARCH(i386)
-SEARCH_DIR(/lib); SEARCH_DIR(/usr/lib); SEARCH_DIR(/usr/local/lib); 
SEARCH_DIR(/usr/alpha-unknown-linux-gnu/lib);
 ENTRY(_start)
+SEARCH_DIR("/usr/i586-suse-linux/lib"); SEARCH_DIR("/usr/local/lib"); 
SEARCH_DIR("/lib"); SEARCH_DIR("/usr/lib");
 SECTIONS
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(0x1000, 0x1000);
+  /* Exception handling  */
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+    KEEP (*(.ctors))
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-     can access them all, and initialized data all before uninitialized, so
-     we can shorten the on-disk segment size.  */
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   __bss_start = .;
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-   *(.bss)
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+      pad the .data section.  */
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   }
-  _end = . ;
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+  . = ALIGN(32 / 8);
+  _end = .;
   PROVIDE (end = .);
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   /* Stabs debugging sections.  */
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-  .stab.excl 0 : { *(.stab.excl) }
-  .stab.exclstr 0 : { *(.stab.exclstr) }
-  .stab.index 0 : { *(.stab.index) }
+  .stab          0 : { *(.stab) }
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   .stab.indexstr 0 : { *(.stab.indexstr) }
-  .comment 0 : { *(.comment) }
+  .comment       0 : { *(.comment) }
   /* DWARF debug sections.
      Symbols in the DWARF debugging sections are relative to the beginning
      of the section so we begin them at 0.  */
@@ -124,7 +172,7 @@
   .debug_aranges  0 : { *(.debug_aranges) }
   .debug_pubnames 0 : { *(.debug_pubnames) }
   /* DWARF 2 */
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+  .debug_info     0 : { *(.debug_info .gnu.linkonce.wi.*) }
   .debug_abbrev   0 : { *(.debug_abbrev) }
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 }
--- ppc.ld
+++ ppc.ld
@@ -1,116 +1,200 @@
-/* ld script to make i386 Linux kernel
- * Written by Martin Mares <address@hidden>;
- */
-OUTPUT_FORMAT("elf32-powerpc", "elf32-powerpc", "elf32-powerpc")
-OUTPUT_ARCH(powerpc)
-SEARCH_DIR(/lib); SEARCH_DIR(/usr/lib); SEARCH_DIR(/usr/local/lib); 
SEARCH_DIR(/usr/alpha-unknown-linux-gnu/lib);
+/* Default linker script, for normal executables */
+OUTPUT_FORMAT("elf32-powerpc", "elf32-powerpc",
+             "elf32-powerpc")
+OUTPUT_ARCH(powerpc:common)
 ENTRY(_start)
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SEARCH_DIR("/lib"); SEARCH_DIR("/usr/lib");
 SECTIONS
 {
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+    /* gcc uses crtbegin.o to find the start of
+       the constructors, so we make sure it is
+       first.  Because this is a wildcard, it
+       doesn't matter if the user does not
+       actually link against crtbegin.o; the
+       linker won't look for a file to match a
+       wildcard.  The wildcard also means that it
+       doesn't matter which directory crtbegin.o
+       is in.  */
+    KEEP (*crtbegin*.o(.ctors))
+    /* We don't want to include the .ctor section from
+       from the crtend.o file until after the sorted ctors.
+       The .ctor section from the crtend file contains the
+       end of ctors marker and it must be last */
+    KEEP (*(EXCLUDE_FILE (*crtend*.o ) .ctors))
+    KEEP (*(SORT(.ctors.*)))
+    KEEP (*(.ctors))
   }
-  .dtors         :
+  .dtors          :
   {
-    *(.dtors)
+    KEEP (*crtbegin*.o(.dtors))
+    KEEP (*(EXCLUDE_FILE (*crtend*.o ) .dtors))
+    KEEP (*(SORT(.dtors.*)))
+    KEEP (*(.dtors))
   }
-  .plt      : { *(.plt)        }
-  .got           : { *(.got.plt) *(.got) }
-  .dynamic       : { *(.dynamic) }
+  .jcr            : { KEEP (*(.jcr)) }
+  .data.rel.ro : { *(.data.rel.ro.local) *(.data.rel.ro*) }
+  .got1           : { *(.got1) }
+  .got2           : { *(.got2) }
+  .dynamic        : { *(.dynamic) }
+  .got            : SPECIAL { *(.got) }
+  . = DATA_SEGMENT_RELRO_END (0, .);
+  .plt            : SPECIAL { *(.plt) }
+  .data           :
+  {
+    *(.data .data.* .gnu.linkonce.d.*)
+    KEEP (*(.gnu.linkonce.d.*personality*))
+    SORT(CONSTRUCTORS)
+  }
+  .data1          : { *(.data1) }
+  .got            : SPECIAL { *(.got) }
   /* We want the small data sections together, so single-instruction offsets
      can access them all, and initialized data all before uninitialized, so
      we can shorten the on-disk segment size.  */
-  .sdata     : { *(.sdata) }
-  _edata  =  .;
-  PROVIDE (edata = .);
+  .sdata          :
+  {
+    PROVIDE (_SDA_BASE_ = 32768);
+    *(.sdata .sdata.* .gnu.linkonce.s.*)
+  }
+  _edata = .; PROVIDE (edata = .);
   __bss_start = .;
-  .sbss      : { *(.sbss) *(.scommon) }
-  .bss       :
+  .sbss           :
+  {
+    PROVIDE (__sbss_start = .); PROVIDE (___sbss_start = .);
+    *(.dynsbss)
+    *(.sbss .sbss.* .gnu.linkonce.sb.*)
+    *(.scommon)
+    PROVIDE (__sbss_end = .); PROVIDE (___sbss_end = .);
+  }
+  .plt            : SPECIAL { *(.plt) }
+  .bss            :
   {
    *(.dynbss)
-   *(.bss)
+   *(.bss .bss.* .gnu.linkonce.b.*)
    *(COMMON)
+   /* Align here to ensure that the .bss section occupies space up to
+      _end.  Align after .bss to ensure correct alignment even if the
+      .bss section disappears because there are no input sections.
+      FIXME: Why do we need it? When there is no .bss section, we don't
+      pad the .data section.  */
+   . = ALIGN(. != 0 ? 32 / 8 : 1);
   }
-  _end = . ;
+  . = ALIGN(32 / 8);
+  . = ALIGN(32 / 8);
+  _end = .;
   PROVIDE (end = .);
+  . = DATA_SEGMENT_END (.);
   /* Stabs debugging sections.  */
-  .stab 0 : { *(.stab) }
-  .stabstr 0 : { *(.stabstr) }
-  .stab.excl 0 : { *(.stab.excl) }
-  .stab.exclstr 0 : { *(.stab.exclstr) }
-  .stab.index 0 : { *(.stab.index) }
+  .stab          0 : { *(.stab) }
+  .stabstr       0 : { *(.stabstr) }
+  .stab.excl     0 : { *(.stab.excl) }
+  .stab.exclstr  0 : { *(.stab.exclstr) }
+  .stab.index    0 : { *(.stab.index) }
   .stab.indexstr 0 : { *(.stab.indexstr) }
-  .comment 0 : { *(.comment) }
+  .comment       0 : { *(.comment) }
   /* DWARF debug sections.
      Symbols in the DWARF debugging sections are relative to the beginning
      of the section so we begin them at 0.  */
@@ -124,7 +208,7 @@
   .debug_aranges  0 : { *(.debug_aranges) }
   .debug_pubnames 0 : { *(.debug_pubnames) }
   /* DWARF 2 */
-  .debug_info     0 : { *(.debug_info) }
+  .debug_info     0 : { *(.debug_info .gnu.linkonce.wi.*) }
   .debug_abbrev   0 : { *(.debug_abbrev) }
   .debug_line     0 : { *(.debug_line) }
   .debug_frame    0 : { *(.debug_frame) }
@@ -136,5 +220,6 @@
   .debug_funcnames 0 : { *(.debug_funcnames) }
   .debug_typenames 0 : { *(.debug_typenames) }
   .debug_varnames  0 : { *(.debug_varnames) }
-  /* These must appear regardless of  .  */
+  /DISCARD/    : { *(.fixup) }
+  /DISCARD/ : { *(.note.GNU-stack) }
 }