Implement linux rseq syscall as ENOSYS

This implements rseq for amd64, arm, arm64, ppc32, ppc64,
s390x and x86 linux as ENOSYS (without warning).

glibc will start using rseq to accelerate sched_getcpu, if
available. This would cause a warning from valgrind every
time a new thread is started.

Real rseq (restartable sequences) support is pretty hard, so
for now just explicitly return ENOSYS (just like we do for clone3).

https://sourceware.org/pipermail/libc-alpha/2021-December/133656.html

diff --git a/coregrind/m_syswrap/syswrap-amd64-linux.c b/coregrind/m_syswrap/syswrap-amd64-linux.c
index 5062324a1ef85bda5007619f7b93558e2daaa833..18b25f80ae1a542801dc4b0832534da5ed07395b 100644 (file)
--- a/coregrind/m_syswrap/syswrap-amd64-linux.c
+++ b/coregrind/m_syswrap/syswrap-amd64-linux.c
@@ -862,6 +862,8 @@ static SyscallTableEntry syscall_table[] = {
 
    LINXY(__NR_statx,             sys_statx),             // 332
 
+   GENX_(__NR_rseq,              sys_ni_syscall),        // 334
+
    LINX_(__NR_membarrier,        sys_membarrier),        // 324
 
    LINX_(__NR_copy_file_range,   sys_copy_file_range),   // 326

diff --git a/coregrind/m_syswrap/syswrap-arm-linux.c b/coregrind/m_syswrap/syswrap-arm-linux.c
index 556dd844b9564aa452641713fd80006cc7c96991..d583cef0c78ae9dc0be82dd68ec4c6bf386f29b7 100644 (file)
--- a/coregrind/m_syswrap/syswrap-arm-linux.c
+++ b/coregrind/m_syswrap/syswrap-arm-linux.c
@@ -1024,6 +1024,7 @@ static SyscallTableEntry syscall_main_table[] = {
    LINX_(__NR_pwritev2,          sys_pwritev2),         // 393
 
    LINXY(__NR_statx,             sys_statx),            // 397
+   GENX_(__NR_rseq,              sys_ni_syscall),       // 398
 
    LINXY(__NR_clock_gettime64,   sys_clock_gettime64),  // 403
    LINX_(__NR_clock_settime64,   sys_clock_settime64),  // 404

diff --git a/coregrind/m_syswrap/syswrap-arm64-linux.c b/coregrind/m_syswrap/syswrap-arm64-linux.c
index b8710772768a22fc12a5d029f7fc92faee8ad73e..2066a38ea9ab2ac15bdf4d2890c68a275c756cc9 100644 (file)
--- a/coregrind/m_syswrap/syswrap-arm64-linux.c
+++ b/coregrind/m_syswrap/syswrap-arm64-linux.c
@@ -823,8 +823,9 @@ static SyscallTableEntry syscall_main_table[] = {
    //   (__NR_pkey_mprotect,     sys_ni_syscall),        // 288
    //   (__NR_pkey_alloc,        sys_ni_syscall),        // 289
    //   (__NR_pkey_free,         sys_ni_syscall),        // 290
+   LINXY(__NR_statx,             sys_statx),             // 291
 
-   LINXY(__NR_statx,             sys_statx),             // 397
+   GENX_(__NR_rseq,              sys_ni_syscall),        // 293
 
    LINXY(__NR_io_uring_setup,    sys_io_uring_setup),    // 425
    LINXY(__NR_io_uring_enter,    sys_io_uring_enter),    // 426

diff --git a/coregrind/m_syswrap/syswrap-ppc32-linux.c b/coregrind/m_syswrap/syswrap-ppc32-linux.c
index 6263ab8451547e0288bc05c143c8dd6c64b6418b..637b2504e1c1fdeb0d4d77e94f88fbc3b14a4627 100644 (file)
--- a/coregrind/m_syswrap/syswrap-ppc32-linux.c
+++ b/coregrind/m_syswrap/syswrap-ppc32-linux.c
@@ -1028,6 +1028,8 @@ static SyscallTableEntry syscall_table[] = {
 
    LINXY(__NR_statx,             sys_statx),            // 383
 
+   GENX_(__NR_rseq,              sys_ni_syscall),       // 387
+
    LINXY(__NR_clock_gettime64,   sys_clock_gettime64),  // 403
    LINX_(__NR_clock_settime64,   sys_clock_settime64),  // 404
 

diff --git a/coregrind/m_syswrap/syswrap-ppc64-linux.c b/coregrind/m_syswrap/syswrap-ppc64-linux.c
index a26b41c321fcbbec862e57c8a317bf4fa1b75ae3..93956d3cc295cd429484af7bcf86d4e54fca15d4 100644 (file)
--- a/coregrind/m_syswrap/syswrap-ppc64-linux.c
+++ b/coregrind/m_syswrap/syswrap-ppc64-linux.c
@@ -1019,6 +1019,8 @@ static SyscallTableEntry syscall_table[] = {
 
    LINXY(__NR_statx,             sys_statx),            // 383
 
+   GENX_(__NR_rseq,              sys_ni_syscall),       // 387
+
    LINXY(__NR_io_uring_setup,    sys_io_uring_setup),    // 425
    LINXY(__NR_io_uring_enter,    sys_io_uring_enter),    // 426
    LINXY(__NR_io_uring_register, sys_io_uring_register), // 427

diff --git a/coregrind/m_syswrap/syswrap-s390x-linux.c b/coregrind/m_syswrap/syswrap-s390x-linux.c
index 5c9209859f2ff41b78ded02411d0807fbcf2e89c..73f9684c46756bc33aa968d686205c865ded9e17 100644 (file)
--- a/coregrind/m_syswrap/syswrap-s390x-linux.c
+++ b/coregrind/m_syswrap/syswrap-s390x-linux.c
@@ -860,6 +860,8 @@ static SyscallTableEntry syscall_table[] = {
 
    LINXY(__NR_statx, sys_statx),                                      // 379
 
+   GENX_(__NR_rseq, sys_ni_syscall),                                  // 381
+
    LINXY(__NR_io_uring_setup, sys_io_uring_setup),                    // 425
    LINXY(__NR_io_uring_enter, sys_io_uring_enter),                    // 426
    LINXY(__NR_io_uring_register, sys_io_uring_register),              // 427

diff --git a/coregrind/m_syswrap/syswrap-x86-linux.c b/coregrind/m_syswrap/syswrap-x86-linux.c
index 1d8f45d33a093d56ef0bf720b825277e439e7b7f..8662ff501a261ab04bf2ebf00ef2debe218beb6a 100644 (file)
--- a/coregrind/m_syswrap/syswrap-x86-linux.c
+++ b/coregrind/m_syswrap/syswrap-x86-linux.c
@@ -1619,6 +1619,8 @@ static SyscallTableEntry syscall_table[] = {
    /* Explicitly not supported on i386 yet. */
    GENX_(__NR_arch_prctl,        sys_ni_syscall),       // 384
 
+   GENX_(__NR_rseq,              sys_ni_syscall),       // 386
+
    LINXY(__NR_clock_gettime64,   sys_clock_gettime64),  // 403
    LINX_(__NR_clock_settime64,   sys_clock_settime64),  // 404
 

diff --git a/include/vki/vki-scnums-arm-linux.h b/include/vki/vki-scnums-arm-linux.h
index ff560e19ddd91e8b90c4735880a0e8a1b2c5b748..485db8b265dc80c5647624c7d122118f3cd8a66d 100644 (file)
--- a/include/vki/vki-scnums-arm-linux.h
+++ b/include/vki/vki-scnums-arm-linux.h
@@ -432,6 +432,7 @@
 #define __NR_pkey_alloc                 395
 #define __NR_pkey_free                  396
 #define __NR_statx                      397
+#define __NR_rseq                       398
 
 
 

diff --git a/include/vki/vki-scnums-arm64-linux.h b/include/vki/vki-scnums-arm64-linux.h
index 9aa3b2b5fbd74b337cdcc6fa4a569ca39078c6fe..acdfb39c6819a92923cdcc976772d129ef0953f9 100644 (file)
--- a/include/vki/vki-scnums-arm64-linux.h
+++ b/include/vki/vki-scnums-arm64-linux.h
@@ -323,9 +323,11 @@
 #define __NR_pkey_alloc 289
 #define __NR_pkey_free 290
 #define __NR_statx 291
+#define __NR_io_pgetevents 291
+#define __NR_rseq 293
 
 #undef __NR_syscalls
-#define __NR_syscalls 292
+#define __NR_syscalls 294
 
 ///*
 // * All syscalls below here should go away really,

diff --git a/include/vki/vki-scnums-ppc32-linux.h b/include/vki/vki-scnums-ppc32-linux.h
index 6987ad941b2e07331fcb39cb0496057c131eaa44..08fa77df0d4c73497f7b9b2199f9e0f6284d4a6e 100644 (file)
--- a/include/vki/vki-scnums-ppc32-linux.h
+++ b/include/vki/vki-scnums-ppc32-linux.h
@@ -415,6 +415,7 @@
 #define __NR_pkey_alloc                384
 #define __NR_pkey_free         385
 #define __NR_pkey_mprotect     386
+#define __NR_rseq              387
 
 #endif /* __VKI_SCNUMS_PPC32_LINUX_H */
 

diff --git a/include/vki/vki-scnums-ppc64-linux.h b/include/vki/vki-scnums-ppc64-linux.h
index 6827964fdf6367c0c41225a88648135a9b935446..a76fa6d322fe1451a9cb151d86004e2d149fd4a7 100644 (file)
--- a/include/vki/vki-scnums-ppc64-linux.h
+++ b/include/vki/vki-scnums-ppc64-linux.h
@@ -407,6 +407,7 @@
 #define __NR_pkey_alloc                384
 #define __NR_pkey_free         385
 #define __NR_pkey_mprotect     386
+#define __NR_rseq              387
 
 #endif /* __VKI_SCNUMS_PPC64_LINUX_H */
 

diff --git a/include/vki/vki-scnums-s390x-linux.h b/include/vki/vki-scnums-s390x-linux.h
index 6487e20c9916baf6e12d379bee3b7ec6d3f19c98..869c04584775c60c7bdc057ebf2b05cc37047efd 100644 (file)
--- a/include/vki/vki-scnums-s390x-linux.h
+++ b/include/vki/vki-scnums-s390x-linux.h
@@ -342,8 +342,11 @@
 #define __NR_s390_guarded_storage      378
 #define __NR_statx                     379
 #define __NR_s390_sthyi                        380
+#define __NR_kexec_file_load           381
+#define __NR_io_pgetevents             382
+#define __NR_rseq                      383
 
-#define NR_syscalls 381
+#define NR_syscalls 384
 
 /* 
  * There are some system calls that are not present on 64 bit, some