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... instead of having an extern declaration in a .c file.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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For each mv64360 entry in the OpenFirmware database, add the
registration of an of_bus to take care of devices connected to
the MV64x60 asynchronous devices controller.
This change makes it possible for those devices to be detected by
drivers that support the of_platform without having a custom call
for each of them in the board file.
Signed-off-by: Remi Machet <rmachet@slac.stanford.edu>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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We use the low bits of regs->trap as flag bits. We already indicate
critical and machine check level exceptions via this mechanism. Extend it
to indicate debug level exceptions.
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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Replace TIF_RESTORE_SIGMASK with TLF_RESTORE_SIGMASK and define
our own set_restore_sigmask() function. This saves the costly
SMP-safe set_bit operation, which we do not need for the sigmask
flag since TIF_SIGPENDING always has to be set too.
Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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bitmap_find_free_region(), called by mpic_msi_alloc_hwirqs() may return
signed, but hwirq is unsigned. A failed allocation remains unnoticed.
Signed-off-by: Roel Kluin <12o3l@tiscali.nl>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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bitmap_find_free_region(), called by mpic_msi_alloc_hwirqs() may return
signed, but hwirq is unsigned. A failed allocation remains unnoticed.
Signed-off-by: Roel Kluin <12o3l@tiscali.nl>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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The following adds local bus, flash and MTD partition nodes for
sbc8548. As well, a compatible field for the soc node, so that
of_platform_bus_probe() will pick it up.
Something that is provided through this newly added epld node
is the Hardware Revision which is now being utilized.
Signed-off-by: Jeremy McNicoll <jeremy.mcnicoll@windriver.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
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Signed-off-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
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Signed-off-by: Zhang Wei <wei.zhang@freescale.com>
Cc: "Nelson, Shannon" <shannon.nelson@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
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DIU platform code should not just write to the PIXIS' BRDCFG0 register,
it should set and clear its own bits only, otherwise it will break
firmware setup (in fact it breaks second uart).
Also get rid of magic numbers in the related code.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
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This patch adds device tree nodes for NOR and NAND flashes and places
board-control node inside the localbus.
defconfig and board file updated appropriately.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
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The 8568 MDS needs some configuration changes to the PHY in order to
work properly. These are done in the firmware, normally, but Linux
shouldn't need to rely on the firmware running such things (someone
could disable the PHY support in the firmware to save space, for instance).
Signed-off-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
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As of current mainline tree, TULIP driver is unusable on MPC8610HPCD
boards. There is a patch[1] floating around (and also included in the
BSP), which tries to heal the situation, though the ethernet is still
unusable. Practically it takes ages to mount NFS filesystem:
VFS: Mounted root (nfs filesystem).
Freeing unused kernel memory: 180k init
nfs: server 10.0.0.2 not responding, still trying
nfs: server 10.0.0.2 OK
nfs: server 10.0.0.2 not responding, still trying
nfs: server 10.0.0.2 not responding, still trying
nfs: server 10.0.0.2 not responding, still trying
nfs: server 10.0.0.2 not responding, still trying
nfs: server 10.0.0.2 OK
nfs: server 10.0.0.2 not responding, still trying
So, instead of trying to add uli526x functionality into TULIP driver
(which is already bloated enough), I fixed existing ULI526X driver
and now it works perfectly well here.
[1] http://www.bitshrine.org/gpp/0024-MPC8610-ETH-Lyra-native-ethernet.txt
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
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* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus: (28 commits)
[MIPS] Pb1000: bury the remnants of the PCI code
[MIPS] Fix build failure in mips oprofile code
[MIPS] fix warning message on SMP kernels
[MIPS] markeins: build fix
[MIPS] ELF handling - use SELFMAG instead of numeric constant
[MIPS] Get rid of __ilog2
[MIPS] Fix __fls for non-MIPS32/MIPS64 cpus
[MIPS] XXS1500 code style cleanup
[MIPS] MTX-1 code style cleanup
[MIPS] Pb1200/DBAu1200 code style cleanup
[MIPS] Pb1550 code style cleanup
[MIPS] Pb1500 code style cleanup
[MIPS] Pb1100 code style cleanup
[MIPS] Pb1000 code style cleanup
[MIPS] DBAu1xx0 code style cleanup
[MIPS] Alchemy PCI code style cleanup
[MIPS] Alchemy common code style cleanup
[MIPS] Alchemy common headers style cleanup
[MIPS] Add empty argument parenthesis to GCC_IMM_ASM
[MIPS] msp_hwbutton.c: minor irq handler cleanups
...
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Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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This patch fixes a warning-as-error induced build failure of 64bit MIPS
kernels.
Signed-off-by: Thiemo Seufer <ths@networkno.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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This patch fixes a (harmless) warning message.
Signed-off-by: Thiemo Seufer <ths@networkno.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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This patch fixes the following build errror caused by
commit 7dffa3c673fbcf835cd7be80bb4aec8ad3f51168
(ntp: handle leap second via timer):
<-- snip -->
...
CC arch/mips/emma2rh/markeins/setup.o
/home/bunk/linux/kernel-2.6/git/linux-2.6/arch/mips/emma2rh/markeins/setup.c:79: error: conflicting types for 'clock'
/home/bunk/linux/kernel-2.6/git/linux-2.6/include/linux/clocksource.h:96: error: previous declaration of 'clock' was here
make[2]: *** [arch/mips/emma2rh/markeins/setup.o] Error 1
<-- snip -->
[Ralf: reformated to 80 colums after the fix and marked emma2rh_clock as
__initdata]
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Fix several errors and warnings given by checkpatch.pl:
- use of C99 // comments;
- using simple_strtol() where strict_strtol() could be used.
In addition to these changes, also do the following:
- remove needless parentheses;
- remove unneeded numeric literal type cast;
- insert spaces between operator and its operands;
- remove excess new lines;
- remove space after the type cast's closing parenthesis;
- insert missing space before closing brace in the structure initializer;
- fix typos, capitalize acronyms, etc. in the comments;
- update MontaVista copyright;
- remove Pete Popov's old email address...
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Fix many errors and warnings given by checkpatch.pl:
- space after opening and before closing parentheses;
- use of C99 // comments;
- leading spaces instead of tabs;
- brace not on the same line with 'else' in the 'if' statement;
statement;
- printk() without KERN_* facility level;
- using simple_strtol() where strict_strtol() could be used.
- including <asm/gpio.h> instead of <linux/gpio.h>.
In addition to these changes, also do the following:
- insert spaces between operator and its operands;
- replace tab between the function type and name with space in
mtx1_pci_idsel() declaration;
- remove space after the type cast's closing parenthesis;
- insert missing space before closing brace in the array/structure
initializers;
- update MontaVista copyright;
- remove Pete Popov's old email address...
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Fix several errors and warnings given by checkpatch.pl:
- use of C99 // comments;
- initialization of a 'static' variable to 0;
- space after opening and before closing parentheses;
- missing space between 'for' and opening parenthesis;
- macros with complex values not enclosed in parentheses;
- printk() without KERN_* facility level;
- unnecessary braces for single-statement block;
- using simple_strtol() where strict_strtol() could be used;
- line over 80 characters.
In addition to these changes, also do the following:
- mention DBAu1200 board in the Makefile;
- replace the group of #include/#ifdef directives by a single
#include <au1xxx.h> since this header contains the needed stuff;
- properly indent the blocks;
- insert spaces between operator and its operands, remove excess spaces
there;
- remove needless parentheses and add some for clarity;
- replace numeric literals/expressions with the matching macros;
- remove space after the type cast's closing parenthesis;
- reduce pb1200_setup_cascade() to the single 'return' statement;
- reduce the number of printed empty lines in the so-called CPLD
workaround;
- remove #undef AU1X00_EXTERNAL_INT since that macro is not defined
anywhere;
- replace spaces after the macro name with tabs in the #define directives;
- remove excess tabs after the macro name in the #define directives;
- fix typo in the BCSR_RESETS_PWMR1mUX macro's name;
- group all Pb1200 PCMCIA definitions together;
- put the function's result type and name/parameters on the same line;
- insert missing and remove excess new lines;
- make the multi-line comment style consistent with the kernel style
elsewhere by adding empty first line and/or adding space/asterisk on
their left side;
- fix typos/errors, capitalize acronyms, etc. in the comments;
- combine some comments;
- update MontaVista copyright;
- remove Pete Popov's old email address...
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Fix a few errors and warnings given by checkpatch.pl:
- macros with complex values not enclosed in parentheses;
- printk() without KERN_* facility level;
- unnecessary braces for single-statement block;
- using simple_strtol() where strict_strtol() could be used.
In addition to these changes, also do the following:
- replace numeric literals with the matching macros;
- properly indent the code and the array initializers;
- insert spaces between operator and its operands, also remove excess spaces
there;
- remove space after the type cast's closing parenthesis;
- insert missing space before closing brace in the array initializers;
- replace spaces after the macro name with tabs in the #define directives, also
sometimes insert space there for better looks;
- remove excess tabs after the macro name in the #define directives;
- fix typos/errors, capitalize acronyms, etc. in the comments;
- make the multi-line comment style consistent with the kernel style elsewhere
by adding empty first line;
- update MontaVista copyright;
- remove Pete Popov's old email address...
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Fix several errors and warnings given by checkpatch.pl:
- use of C99 // comments;
- printk() without KERN_* facility level;
- unnecessary braces for single-statement block;
- using simple_strtol() where strict_strtol() could be used.
In addition to these changes, also do the following:
- replace numeric literals/expressions with the matching macros;
- insert spaces between operator and its operands;
- properly indent the code and the array initializers;
- remove useless #if dirctive from board_setup();
- remove needless parentheses;
- remove unneeded type casts;
- remove excess new lines;
- make hexadecimal literals all lower case;
- remove space after the type cast's closing parenthesis;
- insert missing space before closing brace in the array initializers;
- replace spaces after the macro name with tabs in the #define directives,
also sometimes insert space there for better looks;
- fix typos/errors, capitalize acronyms, etc. in the comments;
- update MontaVista copyright;
- remove Pete Popov's old email address...
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Fix several errors and warnings given by checkpatch.pl:
- space between asterisk and variable name;
- use of C99 // comments;
- using simple_strtol() where strict_strtol() could be used.
In addition to these changes, also do the following:
- properly indent the code;
- remove space after the type cast's closing parenthesis;
- replace numeric literals/expressions with the matching macros;
- replace spaces after the macro name with tabs in the #define directives,
and sometimes insert spaces there;
- fix typos/errors, capitalize acronyms, etc. in the comments;
- make the multi-line comment style consistent with the kernel style
elsewhere by adding empty first line;
- update MontaVista copyright;
- remove Pete Popov's old email address...
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Fix several errors and warnings given by checkpatch.pl:
- use of C99 // comments;
- brace not on the same line with condition in the 'switch' statement;
- printk() without KERN_* facility level;
- unnecessary braces for single-statement block;
- using simple_strtol() where strict_strtol() could be used.
In addition to these changes, also do the following:
- properly indent the 'switch' statement;
- remove needless parentheses;
- insert spaces between operator and its operands;
- replace numeric literals/expressions with the matching macros;
- remove useless #if dirctive from board_setup();
- remove unneeded numeric literal type casts;
- remove space after the type cast's closing parenthesis;
- replace spaces after the macro name with tabs in the #define directives, and
sometimes insert spaces there;
- remove excess new lines;
- fix typos/errors, capitalize acronyms, etc. in the comments;
- make the multi-line comment style consistent with the kernel style elsewhere
by adding empty first/last line;
- combine some comments;
- update MontaVista copyright;
- remove Pete Popov's old email address...
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Fix several errors and warnings given by checkpatch.pl:
- macros with complex values not enclosed in parentheses;
- leading spaces instead of tabs;
- printk() without KERN_* facility level;
- using simple_strtol() where strict_strtol() could be used;
- line over 80 characters.
In addition to these changes, also do the following:
- initialize variable instead of assigning value later where it makes sense;
- insert spaces between operator and its operands, also remove excess spaces
there;
- remove unneeded numeric literal type casts;
- remove needless parentheses;
- remove space after the type cast's closing parenthesis;
- insert missing space before closing brace in the array initializers;
- replace spaces after the macro name with tabs in the #define directives;
- remove excess tabs after the macro name in the #define directives;
- fix typos/errors, capitalize acronyms, etc. in the comments;
- make the multi-line comment style consistent with the kernel style elsewhere
by adding empty first/last line;
- update MontaVista copyright;
- remove Pete Popov's old email address...
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Fix 15 errors and 4 warnings given by checkpatch.pl:
- space between the asterisk and variable name;
- space after opening and before closing parentheses;
- leading spaces instead of tabs;
- printk() without KERN_* facility level;
- unnecessary braces for single-statement block;
- line over 80 characters.
In addition to these changes, also do the following:
- combine the nested 'if' statements into one when possible;
- remove needless parentheses;
- add missing and remove excess spaces between operator and its operands;
- fix printk() format specifiers mismatching the argument types;
- put the function's result type and name/parameters on the same line;
- insert missing and remove excess new lines;
- properly indent multi-line expressions;
- make the multi-line comment style consistent with the kernel style elsewhere
by adding empty first line;
- fix typos, capitalize acronyms, etc. in the comments;
- update MontaVista copyright;
- remove Pete Popov's old email address...
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Fix many errors and warnings given by checkpatch.pl:
- use of C99 // comments;
- missing space between the type and asterisk in a variable declaration;
- space between the asterisk and function/variable name;
- leading spaces instead of tabs;
- space after opening and before closing parentheses;
- initialization of a 'static' variable to 0;
- missing spaces around assignement/comparison operator;
- brace not on the same line with condition (or 'else') in the 'if'/'switch'
statement;
- missing space between 'if'/'for'/'while' and opening parenthesis;
- use of assignement in 'if' statement's condition;
- printk() without KERN_* facility level;
- EXPORT_SYMBOL() not following its function immediately;
- unnecessary braces for single-statement block;
- adding new 'typedef' (where including <linux/types.h> will do);
- use of 'extern' in the .c file (where it can be avoided by including header);
- line over 80 characters.
In addition to these changes, also do the following:
- insert missing space after opening brace and/or before closing brace in the
structure initializers;
- insert spaces between operator and its operands;
- put the function's result type and name/parameters on the same line;
- properly indent multi-line expressions;
- remove commented out code;
- remove useless initializers and code;
- remove needless parentheses;
- fix broken/excess indentation;
- add missing spaces between operator and its operands;
- insert missing and remove excess new lines;
- group 'else' and 'if' together where possible;
- make au1xxx_platform_init() 'static';
- regroup variable declarations in pm_do_freq() for prettier look;
- replace numeric literals with the matching macros;
- fix printk() format specifiers mismatching the argument types;
- make the multi-line comment style consistent with the kernel style elsewhere
by adding empty first line and/or adding space on their left side;
- make two-line comments that only have one line of text one-line;
- fix typos/errors, capitalize acronyms, etc. in the comments;
- fix/remove obsolete references in the comments;
- reformat some comments;
- add comment about the CPU:counter clock ratio to calc_clock();
- update MontaVista copyright;
- remove Pete Popov's and Steve Longerbeam's old email addresses...
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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This is to clarify that GCC_IMM_ASM does not take an argument as the
context of the macro's invocation seems to imply.
As suggested by Maciej W. Rozycki (macro@linux-mips.org).
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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- remove always-true test
- neaten request_irq() indentation
This change's main purpose is to prepare for the patchset in
jgarzik/misc-2.6.git#irq-remove, that explores removal of the
never-used 'irq' argument in each interrupt handler.
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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This patch removes the no longer used export of __kmap_atomic_to_page.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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This was dropped by
commit a0d9e2d891e4cf54676c430da63bd4a17d1cdb80 (lmo)
commit b6f1f0dea1469e0c956eb89399916d60dd2a3808 (ko)
Author: Franck Bui-Huu <vagabon.xyz@gmail.com>
Date: Fri Aug 11 17:51:48 2006 +0200
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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do_brk's return value was stored in an unsigned long variable before being
tested for less than zero making the test always fail. Also do_brk's
called irix_map_prda_page wasn't forwarding do_brk() success.
Bug checking the return value of do_brk() and initial fix for it found
by Roel Kluin <12o3l@tiscali.nl>.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Signed-off-by: Kevin D. Kissell <kevink@mips.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Still won't play nicely with esotheric configurations such as discontig
memory ...
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Signed-off-by: Roel Kluin <12o3l@tiscali.nl>
Acked-By: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Signed-off-by: Kevin D. Kissell <kevink@mips.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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The Alchemy platform code registers the SMBus device using the virtual
address of its registers instead of the physical one -- fix this, taking
into account that actually the whole megabyte is decoded by any of the
programmable serial controllers (one of which is SMBus), and that all the
Alchemy peripherals are directly mappable into KSEG1 kernel space and
therefore ioremap() call would just boil down to CKSEG1ADDR() invocation.
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc
* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc:
[POWERPC] ppc: More compile fixes
[POWERPC] ppc: Don't run prom_init_check for arch/ppc builds
[POWERPC] ppc: Include <asm/cacheflush.h> in kernel/ppc_ksyms.c
[POWERPC] ppc: Use ebony_defconfig for defconfig
[POWERPC] Fix default cputable entries for e200 and e500 families
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* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
sparc64: Work around memory probing bug in openfirmware.
sparc32: fix rtrap.S typo
sparc32: Fix build.
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This fixes a few more miscellaneous compile problems with ARCH=ppc.
1. Don't compile devres.c on ARCH=ppc, it doesn't have ioremap_flags.
2. Include <asm/irq.h> in setup.c for the __DO_IRQ_CANON definition.
3. Include <linux/proc_fs.h> in residual.c for the
definition of create_proc_read_entry.
4. Fix xchg_ptr to be a static inline to eliminate a compiler warning.
Signed-off-by: Paul Mackerras <paulus@samba.org>
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arch/ppc doesn't have prom_init.o (anymore).
Signed-off-by: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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It needs it:
arch/ppc/kernel/ppc_ksyms.c:152: error: '__flush_icache_range'
undeclared here (not in a function)
and a few more like that.
Signed-off-by: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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We used to use common_defconfig, but it was removed some time ago.
Signed-off-by: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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Commit 76bc080ef5a34aedb63e1691f28c6b42f3468e4e ("POWERPC] Make default
cputable entries reflect selected CPU family") added default entries
for the e200 and e500 families, but missed a closing brace on those
entries, as pointed out by David Gibson. This adds the closing braces.
Signed-off-by: Paul Mackerras <paulus@samba.org>
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Read all of the OF memory and translation tables, then read
the physical available memory list twice.
When making these requests, OF can allocate more memory to
do it's job, which can remove pages from the available
memory list.
So fetch in all of the tables at once, and fetch the available
list last to make sure we read a stable value.
Signed-off-by: David S. Miller <davem@davemloft.net>
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Fix compile problem in rtrap.S
arch/sparc/kernel/built-in.o: In function `ret_trap_userwins_ok':
arch/sparc/kernel/rtrap.S:(.text+0x1900): undefined reference to
`PSR_SYCALL'
Signed-off-by: Robert Reif <reif@earthlink.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
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* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
sparc: Fix debugger syscall restart interactions.
sparc: Fix ptrace() detach.
sparc32: Don't twiddle PT_DTRACE in exec.
sparc video: remove open boot prom code
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So, forever, we've had this ptrace_signal_deliver implementation
which tries to handle all of the nasties that can occur when the
debugger looks at a process about to take a signal. It's meant
to address all of these issues inside of the kernel so that the
debugger need not be mindful of such things.
Problem is, this doesn't work.
The idea was that we should do the syscall restart business first, so
that the debugger captures that state. Otherwise, if the debugger for
example saves the child's state, makes the child execute something
else, then restores the saved state, we won't handle the syscall
restart properly because we lose the "we're in a syscall" state.
The code here worked for most cases, but if the debugger actually
passes the signal through to the child unaltered, it's possible that
we would do a syscall restart when we shouldn't have.
In particular this breaks the case of debugging a process under a gdb
which is being debugged by yet another gdb. gdb uses sigsuspend
to wait for SIGCHLD of the inferior, but if gdb itself is being
debugged by a top-level gdb we get a ptrace_stop(). The top-level gdb
does a PTRACE_CONT with SIGCHLD to let the inferior gdb see the
signal. But ptrace_signal_deliver() assumed the debugger would cancel
out the signal and therefore did a syscall restart, because the return
error was ERESTARTNOHAND.
Fix this by simply making ptrace_signal_deliver() a nop, and providing
a way for the debugger to control system call restarting properly:
1) Report a "in syscall" software bit in regs->{tstate,psr}.
It is set early on in trap entry to a system call and is fully
visible to the debugger via ptrace() and regsets.
2) Test this bit right before doing a syscall restart. We have
to do a final recheck right after get_signal_to_deliver() in
case the debugger cleared the bit during ptrace_stop().
3) Clear the bit in trap return so we don't accidently try to set
that bit in the real register.
As a result we also get a ptrace_{is,clear}_syscall() for sparc32 just
like sparc64 has.
M68K has this same exact bug, and is now the only other user of the
ptrace_signal_deliver hook. It needs to be fixed in the same exact
way as sparc.
Signed-off-by: David S. Miller <davem@davemloft.net>
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