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patches/gdb/6.3/400-mips-coredump.patch-2.4.23-29
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Sun May 20 13:48:26 2007 +0000 (2007-05-20)
changeset 112 ea15433daba0
permissions -rw-r--r--
Ah! I finally have a progress bar that doesn't stall the build!
- pipe size in Linux is only 8*512=4096 bytes
- pipe size is not setable
- when the feeding process spits out data faster than the eating
process can read it, then the feeding process stalls after 4KiB
of data sent to the pipe
- for us, the progress bar would spawn a sub-shell every line,
and the sub-shell would in turn spawn a 'date' command.
Which was sloooww as hell, and would cause some kind of a
starvation: the pipe was full most of the time, and the
feeding process was stalled all this time.

Now, we use internal variables and a little hack based onan offset
to determine the elapsed time. Much faster this way, but still
CPU-intensive. 
     1 Sometime around 2.4.22-23, the mips pt_regs.h fields were reordered, breaking

     2 coredump handling by gdb for current kernels.  Update the hardcoded constants

     3 to reflect the change.

     4 --- gdb-6.2.1/gdb/mips-linux-tdep.c-orig	2004-10-29 14:23:55.000000000 -0500

     5 +++ gdb-6.2.1/gdb/mips-linux-tdep.c	2004-10-29 14:26:44.000000000 -0500

     6 @@ -53,12 +53,22 @@

     7  

     8  #define EF_REG0			6

     9  #define EF_REG31		37

    10 +

    11 +#if 0

    12  #define EF_LO			38

    13  #define EF_HI			39

    14  #define EF_CP0_EPC		40

    15  #define EF_CP0_BADVADDR		41

    16  #define EF_CP0_STATUS		42

    17  #define EF_CP0_CAUSE		43

    18 +#else

    19 +#define EF_CP0_STATUS		38

    20 +#define EF_LO			39

    21 +#define EF_HI			40

    22 +#define EF_CP0_BADVADDR		41

    23 +#define EF_CP0_CAUSE		42

    24 +#define EF_CP0_EPC		43

    25 +#endif

    26  

    27  #define EF_SIZE			180

    28
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