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From the syscall_fmts->arg entries for formatting strace-like syscalls. This is when resolving the string "whence" on a filter expression for the syscalls:sys_enter_lseek: Breakpoint 3, perf_evsel__syscall_arg_fmt (evsel=0xc91ed0, arg=0x7fffffff7cd0 "whence") at builtin-trace.c:3626 3626 { (gdb) n 3628 struct syscall_arg_fmt *fmt = __evsel__syscall_arg_fmt(evsel); (gdb) n 3630 if (evsel->tp_format == NULL || fmt == NULL) (gdb) n 3633 for (field = evsel->tp_format->format.fields; field; field = field->next, ++fmt) (gdb) n 3634 if (strcmp(field->name, arg) == 0) (gdb) p field->name $3 = 0xc945e0 "__syscall_nr" (gdb) n 3633 for (field = evsel->tp_format->format.fields; field; field = field->next, ++fmt) (gdb) p *fmt $4 = {scnprintf = 0x0, strtoul = 0x0, mask_val = 0x0, parm = 0x0, name = 0x0, nr_entries = 0, show_zero = false} (gdb) n 3634 if (strcmp(field->name, arg) == 0) (gdb) p field->name $5 = 0xc94690 "fd" (gdb) n 3633 for (field = evsel->tp_format->format.fields; field; field = field->next, ++fmt) (gdb) n 3634 if (strcmp(field->name, arg) == 0) (gdb) n 3633 for (field = evsel->tp_format->format.fields; field; field = field->next, ++fmt) (gdb) n 3634 if (strcmp(field->name, arg) == 0) (gdb) p *fmt $9 = {scnprintf = 0x489be2 <syscall_arg__scnprintf_strarray>, strtoul = 0x0, mask_val = 0x0, parm = 0xa2da80 <strarray.whences>, name = 0x0, nr_entries = 0, show_zero = false} (gdb) p field->name $10 = 0xc947b0 "whence" (gdb) p fmt->parm $11 = (void *) 0xa2da80 <strarray.whences> (gdb) p *(struct strarray *)fmt->parm $12 = {offset = 0, nr_entries = 5, prefix = 0x724d37 "SEEK_", entries = 0xa2da40 <whences>} (gdb) p (struct strarray *)fmt->parm)->entries Junk after end of expression. (gdb) p ((struct strarray *)fmt->parm)->entries $13 = (const char **) 0xa2da40 <whences> (gdb) p ((struct strarray *)fmt->parm)->entries[0] $14 = 0x724d21 "SET" (gdb) p ((struct strarray *)fmt->parm)->entries[1] $15 = 0x724d25 "CUR" (gdb) p ((struct strarray *)fmt->parm)->entries[2] $16 = 0x724d29 "END" (gdb) p ((struct strarray *)fmt->parm)->entries[2] $17 = 0x724d29 "END" (gdb) p ((struct strarray *)fmt->parm)->entries[3] $18 = 0x724d2d "DATA" (gdb) p ((struct strarray *)fmt->parm)->entries[4] $19 = 0x724d32 "HOLE" (gdb) Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lkml.kernel.org/n/tip-lc8h9jgvbnboe0g7ic8tra1y@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
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arch | ||
block | ||
certs | ||
crypto | ||
Documentation | ||
drivers | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
LICENSES | ||
mm | ||
net | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.clang-format | ||
.cocciconfig | ||
.get_maintainer.ignore | ||
.gitattributes | ||
.gitignore | ||
.mailmap | ||
COPYING | ||
CREDITS | ||
Kbuild | ||
Kconfig | ||
MAINTAINERS | ||
Makefile | ||
README |
Linux kernel ============ There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. The formatted documentation can also be read online at: https://www.kernel.org/doc/html/latest/ There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.