patches/uClibc/0.9.32/160-fix-TLS-DTPREL-TPREL-macros.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Tue Dec 13 23:32:39 2011 +0100 (2011-12-13)
changeset 2807 4193d6e6a174
permissions -rw-r--r--
scripts: fix dumping execution backtrace

Dumping the backtrace has been broken since changeset #652e56d6d35a:
scripts: execute each steps in a subshell

We can spawn sub-sub-shells in some cases.

The way the fault handler works is to dump the backtrace, but to avoid
printing it once for every sub-shell (which could get quite confusing),
it simply exits when it detects that it is being run in a sub-shell,
leaving to the top-level shell the work to dump the backtrace.

Because each step is executed in its own sub-shell, the variable arrays
that contain the step name, the source file and line number, are lost
when exiting the per-step sub-shell.

Hence, the backtrace is currently limited to printing only the top-level
main procedure of the shell.

Fix this thus:
- when dumping the bckatraces for the steps & the functions, remember
it was dumped, and only dump it if it was not already dumped
- at the top-level shell, print the hints

Also, rename the top-level step label.

Reported-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
     1 ldso/mips: workaround for missing TLS macros in elfinterpret.c
     2 
     3 These macros declarations are missing, so gcc believes the code is calling
     4 a function, so any later linking will fail.
     5 
     6 Work this around by copying the mcaros from:
     7    libpthread/nptl/sysdeps/mips/dl-tls.h
     8 
     9 We can't include the header because of incompatible symbol declarations,
    10 so we just copy the macros for now.
    11 
    12 ---->  THIS IS A DIRTY HACK!  <----
    13 
    14 Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
    15 
    16 diff -durN uClibc-0.9.32.orig/ldso/ldso/mips/elfinterp.c uClibc-0.9.32/ldso/ldso/mips/elfinterp.c
    17 --- uClibc-0.9.32.orig/ldso/ldso/mips/elfinterp.c	2011-06-08 21:35:20.000000000 +0200
    18 +++ uClibc-0.9.32/ldso/ldso/mips/elfinterp.c	2011-09-12 14:02:37.553628824 +0200
    19 @@ -34,6 +34,21 @@
    20  
    21  #define OFFSET_GP_GOT 0x7ff0
    22  
    23 +/* The thread pointer points 0x7000 past the first static TLS block.  */
    24 +#define TLS_TP_OFFSET           0x7000
    25 +
    26 +/* Dynamic thread vector pointers point 0x8000 past the start of each
    27 + *    TLS block.  */
    28 +#define TLS_DTV_OFFSET          0x8000
    29 +
    30 +/* Compute the value for a GOTTPREL reloc.  */
    31 +#define TLS_TPREL_VALUE(sym_map, sym_val) \
    32 +  ((sym_map)->l_tls_offset + sym_val - TLS_TP_OFFSET)
    33 +
    34 +/* Compute the value for a DTPREL reloc.  */
    35 +#define TLS_DTPREL_VALUE(sym_val) \
    36 +  (sym_val - TLS_DTV_OFFSET)
    37 +
    38  unsigned long __dl_runtime_resolve(unsigned long sym_index,
    39  	unsigned long old_gpreg)
    40  {