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signal: Introduce TRAP_PERF si_code and si_perf to siginfo

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Introduces the TRAP_PERF si_code, and associated siginfo_t field
si_perf. These will be used by the perf event subsystem to send signals
(if requested) to the task where an event occurred.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> # m68k
Acked-by: Arnd Bergmann <arnd@arndb.de> # asm-generic
Link: https://lkml.kernel.org/r/20210408103605.1676875-6-elver@google.com
This commit is contained in:
Marco Elver
2021-04-08 12:36:00 +02:00
committed by Peter Zijlstra
parent 2e498d0a74
commit fb6cc127e0
8 changed files with 33 additions and 3 deletions
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6
include/uapi/asm-generic/siginfo.h
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@@ -91,6 +91,8 @@ union __sifields {
char _dummy_pkey[__ADDR_BND_PKEY_PAD];
__u32 _pkey;
} _addr_pkey;
/* used when si_code=TRAP_PERF */
__u64 _perf;
};
} _sigfault;
@@ -155,6 +157,7 @@ typedef struct siginfo {
#define si_lower _sifields._sigfault._addr_bnd._lower
#define si_upper _sifields._sigfault._addr_bnd._upper
#define si_pkey _sifields._sigfault._addr_pkey._pkey
#define si_perf _sifields._sigfault._perf
#define si_band _sifields._sigpoll._band
#define si_fd _sifields._sigpoll._fd
#define si_call_addr _sifields._sigsys._call_addr
@@ -253,7 +256,8 @@ typedef struct siginfo {
#define TRAP_BRANCH 3 /* process taken branch trap */
#define TRAP_HWBKPT 4 /* hardware breakpoint/watchpoint */
#define TRAP_UNK 5 /* undiagnosed trap */
#define NSIGTRAP 5
#define TRAP_PERF 6 /* perf event with sigtrap=1 */
#define NSIGTRAP 6
/*
* There is an additional set of SIGTRAP si_codes used by ptrace