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| author | Steven Rostedt <srostedt@redhat.com> | 2009-09-16 20:03:06 -0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2009-09-17 15:53:14 -0400 |
| commit | 91adcd2c4b104a8ce2973e6e84b01fd48735ffc6 (patch) | |
| tree | 18a97957e7881ef3e4405be940c0ebfc61873b41 /lib/vsprintf.c | |
| parent | 45bd00d31de886f8425b4dd33204b911b0a466a9 (diff) | |
| download | lwn-91adcd2c4b104a8ce2973e6e84b01fd48735ffc6.tar.gz lwn-91adcd2c4b104a8ce2973e6e84b01fd48735ffc6.zip | |
vsprintf: add %ps that is the same as %pS but is like %pf
On PowerPC64 function pointers do not point directly at the functions,
but instead point to pointers to the functions. The output of %pF expects
to point to a pointer to the function, whereas %pS will show the function
itself.
mcount returns the direct pointer to the function and not the pointer to
the pointer. Thus %pS must be used to show this. The function tracer
requires printing of the functions without offsets and uses the %pf
instead.
%pF produces run_local_timers+0x4/0x1f
%pf produces just run_local_timers
For PowerPC64, we need to use the direct pointer, and we only have
%pS which will produce .run_local_timers+0x4/0x1f
This patch creates a %ps that matches the %pf as %pS matches %pF.
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Zhao Lei <zhaolei@cn.fujitsu.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'lib/vsprintf.c')
| -rw-r--r-- | lib/vsprintf.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c index cb8a112030bb..c8f3ed62cee1 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -581,7 +581,7 @@ static char *symbol_string(char *buf, char *end, void *ptr, unsigned long value = (unsigned long) ptr; #ifdef CONFIG_KALLSYMS char sym[KSYM_SYMBOL_LEN]; - if (ext != 'f') + if (ext != 'f' && ext != 's') sprint_symbol(sym, value); else kallsyms_lookup(value, NULL, NULL, NULL, sym); @@ -822,6 +822,7 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr, case 'F': case 'f': ptr = dereference_function_descriptor(ptr); + case 's': /* Fallthrough */ case 'S': return symbol_string(buf, end, ptr, spec, *fmt); @@ -1063,7 +1064,8 @@ qualifier: * @args: Arguments for the format string * * This function follows C99 vsnprintf, but has some extensions: - * %pS output the name of a text symbol + * %pS output the name of a text symbol with offset + * %ps output the name of a text symbol without offset * %pF output the name of a function pointer with its offset * %pf output the name of a function pointer without its offset * %pR output the address range in a struct resource |