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prctl: add decoding of PR_SVE_SET_VL and PR_SVE_GET_VL commands

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These commands were introduced in Linux commit v4.15-rc1~110^2~9.

* xlat/pr_sve_vl_flags.in: New file.
* xlat/prctl_options.in: Likewise.
* prctl.c: Include "xstring.h" and "xlat/pr_sve_vl_flags.h".
[!PR_SVE_VL_LEN_MASK] (PR_SVE_VL_LEN_MASK): New macro constant.
(sprint_sve_val): New function.
(SYS_FUNC(prctl)): Add decoding for PR_SVE_GET_VL and PR_SVE_SET_VL
commands.
* NEWS: Mention it.
This commit is contained in:
Eugene Syromyatnikov 2018-02-21 20:57:16 +01:00 committed by Dmitry V. Levin
parent fd02ce4ff8
commit beafdd36e1
4 changed files with 46 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
NEWS
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@ -11,7 +11,7 @@ Noteworthy changes in release ?.?? (????-??-??)
* Improvements
* IPv6 addresses shown in socket information in -yy mode are now printed
in brackets.
* Enhanced decoding of ptrace syscall.
* Enhanced decoding of prctl and ptrace syscalls.
* Enhanced NETLINK_ROUTE protocol decoding.
* Updated lists of signal codes.
* Updated lists of BPF_*, BTN_*, ETH_P_*, INET_DIAG_BC_*, KEY_*, POLL*, RWF_*,

41
prctl.c
View File

@ -33,6 +33,8 @@
#include <linux/prctl.h>
#include "xstring.h"
#include "xlat/prctl_options.h"
#include "xlat/pr_cap_ambient.h"
#include "xlat/pr_dumpable.h"
@ -40,6 +42,7 @@
#include "xlat/pr_mce_kill.h"
#include "xlat/pr_mce_kill_policy.h"
#include "xlat/pr_set_mm.h"
#include "xlat/pr_sve_vl_flags.h"
#include "xlat/pr_tsc.h"
#include "xlat/pr_unalign_flags.h"
@ -65,6 +68,11 @@ enum {
#include "xlat/cap.h"
#ifndef PR_SVE_VL_LEN_MASK
# define PR_SVE_VL_LEN_MASK 0xffff
#endif
static void
print_prctl_args(struct tcb *tcp, const unsigned int first)
{
@ -74,6 +82,22 @@ print_prctl_args(struct tcb *tcp, const unsigned int first)
tprintf(", %#" PRI_klx, tcp->u_arg[i]);
}
static char *
sprint_sve_val(kernel_ulong_t arg)
{
static char out[sizeof("PR_SVE_SET_VL_ONEXEC|PR_SVE_VL_INHERIT|0x") +
sizeof(kernel_ulong_t) * 2];
kernel_ulong_t vl = arg & PR_SVE_VL_LEN_MASK;
kernel_ulong_t flags = arg & ~PR_SVE_VL_LEN_MASK;
const char *flags_str = sprintflags("", pr_sve_vl_flags, flags);
xsprintf(out, "%s%s%#" PRI_klx,
flags_str ?: "", flags_str ? "|" : "", vl);
return out;
}
SYS_FUNC(prctl)
{
const unsigned int option = tcp->u_arg[0];
@ -184,6 +208,23 @@ SYS_FUNC(prctl)
(kernel_ulong_t) tcp->u_rval);
return RVAL_STR;
case PR_SVE_SET_VL:
if (entering(tcp)) {
tprintf(", %s", sprint_sve_val(arg2));
return 0;
}
ATTRIBUTE_FALLTHROUGH;
case PR_SVE_GET_VL:
if (entering(tcp))
break;
if (syserror(tcp) || tcp->u_rval == 0)
return 0;
tcp->auxstr = sprint_sve_val(tcp->u_rval);
return RVAL_STR;
/* PR_TASK_PERF_EVENTS_* take no arguments. */
case PR_TASK_PERF_EVENTS_DISABLE:
case PR_TASK_PERF_EVENTS_ENABLE:

2
xlat/pr_sve_vl_flags.in Normal file
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@ -0,0 +1,2 @@
PR_SVE_SET_VL_ONEXEC (1 << 18)
PR_SVE_VL_INHERIT (1 << 17)

2
xlat/prctl_options.in
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@ -44,4 +44,6 @@ PR_MPX_DISABLE_MANAGEMENT 44
PR_SET_FP_MODE 45
PR_GET_FP_MODE 46
PR_CAP_AMBIENT 47
PR_SVE_SET_VL 50
PR_SVE_GET_VL 51
PR_SET_VMA 0x53564d41