From: Eugene Syromyatnikov <evgsyr@gmail.com>
Date: Sat, 19 Nov 2016 20:10:01 +0000 (+0300)
Subject: prctl: implement decoding of PR_SET_FP_MODE and PR_GET_FP_MODE options
X-Git-Tag: v4.15~99
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=10922d31125629ea7bb88ccdbc4a5e7fe6767a19;p=strace

prctl: implement decoding of PR_SET_FP_MODE and PR_GET_FP_MODE options

* xlat/pr_fp_mode.in: New file.
* prctl.c: Include "xlat/pr_fp_mode.h".
(SYS_FUNC(prctl)): Add handling for PR_SET_FP_MODE and PR_GET_FP_MODE
options.
---

diff --git a/prctl.c b/prctl.c
index 450b399e..32b79d78 100644
--- a/prctl.c
+++ b/prctl.c
@@ -34,6 +34,7 @@
 
 #include "xlat/prctl_options.h"
 #include "xlat/pr_cap_ambient.h"
+#include "xlat/pr_fp_mode.h"
 #include "xlat/pr_mce_kill.h"
 #include "xlat/pr_mce_kill_policy.h"
 #include "xlat/pr_set_mm.h"
@@ -165,6 +166,15 @@ SYS_FUNC(prctl)
 		}
 		break;
 
+	case PR_GET_FP_MODE:
+		if (entering(tcp))
+			break;
+		if (syserror(tcp) || tcp->u_rval == 0)
+			return 0;
+		tcp->auxstr = sprintflags("", pr_fp_mode,
+					  (unsigned long) 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:
@@ -311,6 +321,11 @@ SYS_FUNC(prctl)
 				      (unsigned long) tcp->u_rval);
 		return tcp->auxstr ? RVAL_STR : RVAL_UDECIMAL;
 
+	case PR_SET_FP_MODE:
+		tprints(", ");
+		printflags(pr_fp_mode, arg2, "PR_FP_MODE_???");
+		return RVAL_DECODED;
+
 	case PR_GET_NO_NEW_PRIVS:
 	case PR_GET_THP_DISABLE:
 	case PR_MPX_DISABLE_MANAGEMENT:
diff --git a/xlat/pr_fp_mode.in b/xlat/pr_fp_mode.in
new file mode 100644
index 00000000..8f144546
--- /dev/null
+++ b/xlat/pr_fp_mode.in
@@ -0,0 +1,2 @@
+PR_FP_MODE_FR		(1 << 0)	/* 64b FP registers */
+PR_FP_MODE_FRE		(1 << 1)	/* 32b compatibility */