From 40965ad93127204058b0f17719f9579709e4344a Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Fri, 7 Jul 2023 21:40:33 +0100 Subject: [PATCH] linux-user/strace: Expand struct flags to hold a mask MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit A zero bit value does not make sense -- it must relate to some field in some way. Define FLAG_BASIC with a build-time sanity check. Adjust FLAG_GENERIC and FLAG_TARGET to use it. Add FLAG_GENERIC_MASK and FLAG_TARGET_MASK. Fix up the existing flag definitions for build errors. Reviewed-by: Alex Bennée Signed-off-by: Richard Henderson Message-Id: <20230707204054.8792-6-richard.henderson@linaro.org> --- linux-user/strace.c | 40 ++++++++++++++++++++++------------------ 1 file changed, 22 insertions(+), 18 deletions(-) diff --git a/linux-user/strace.c b/linux-user/strace.c index 669200c4a4..9228b235da 100644 --- a/linux-user/strace.c +++ b/linux-user/strace.c @@ -46,15 +46,21 @@ struct syscallname { */ struct flags { abi_long f_value; /* flag */ + abi_long f_mask; /* mask */ const char *f_string; /* stringified flag */ }; +/* No 'struct flags' element should have a zero mask. */ +#define FLAG_BASIC(V, M, N) { V, M | QEMU_BUILD_BUG_ON_ZERO(!(M)), N } + /* common flags for all architectures */ -#define FLAG_GENERIC(name) { name, #name } +#define FLAG_GENERIC_MASK(V, M) FLAG_BASIC(V, M, #V) +#define FLAG_GENERIC(V) FLAG_BASIC(V, V, #V) /* target specific flags (syscall_defs.h has TARGET_) */ -#define FLAG_TARGET(name) { TARGET_ ## name, #name } +#define FLAG_TARGET_MASK(V, M) FLAG_BASIC(TARGET_##V, TARGET_##M, #V) +#define FLAG_TARGET(V) FLAG_BASIC(TARGET_##V, TARGET_##V, #V) /* end of flags array */ -#define FLAG_END { 0, NULL } +#define FLAG_END { 0, 0, NULL } /* Structure used to translate enumerated values into strings */ struct enums { @@ -963,7 +969,7 @@ print_syscall_ret_ioctl(CPUArchState *cpu_env, const struct syscallname *name, #endif UNUSED static const struct flags access_flags[] = { - FLAG_GENERIC(F_OK), + FLAG_GENERIC_MASK(F_OK, R_OK | W_OK | X_OK), FLAG_GENERIC(R_OK), FLAG_GENERIC(W_OK), FLAG_GENERIC(X_OK), @@ -999,9 +1005,9 @@ UNUSED static const struct flags mode_flags[] = { }; UNUSED static const struct flags open_access_flags[] = { - FLAG_TARGET(O_RDONLY), - FLAG_TARGET(O_WRONLY), - FLAG_TARGET(O_RDWR), + FLAG_TARGET_MASK(O_RDONLY, O_ACCMODE), + FLAG_TARGET_MASK(O_WRONLY, O_ACCMODE), + FLAG_TARGET_MASK(O_RDWR, O_ACCMODE), FLAG_END, }; @@ -1010,7 +1016,9 @@ UNUSED static const struct flags open_flags[] = { FLAG_TARGET(O_CREAT), FLAG_TARGET(O_DIRECTORY), FLAG_TARGET(O_EXCL), +#if TARGET_O_LARGEFILE != 0 FLAG_TARGET(O_LARGEFILE), +#endif FLAG_TARGET(O_NOCTTY), FLAG_TARGET(O_NOFOLLOW), FLAG_TARGET(O_NONBLOCK), /* also O_NDELAY */ @@ -1075,7 +1083,7 @@ UNUSED static const struct flags umount2_flags[] = { }; UNUSED static const struct flags mmap_prot_flags[] = { - FLAG_GENERIC(PROT_NONE), + FLAG_GENERIC_MASK(PROT_NONE, PROT_READ | PROT_WRITE | PROT_EXEC), FLAG_GENERIC(PROT_EXEC), FLAG_GENERIC(PROT_READ), FLAG_GENERIC(PROT_WRITE), @@ -1103,7 +1111,7 @@ UNUSED static const struct flags mmap_flags[] = { #ifdef MAP_POPULATE FLAG_TARGET(MAP_POPULATE), #endif -#ifdef TARGET_MAP_UNINITIALIZED +#if defined(TARGET_MAP_UNINITIALIZED) && TARGET_MAP_UNINITIALIZED != 0 FLAG_TARGET(MAP_UNINITIALIZED), #endif FLAG_TARGET(MAP_HUGETLB), @@ -1201,13 +1209,13 @@ UNUSED static const struct flags statx_flags[] = { FLAG_GENERIC(AT_SYMLINK_NOFOLLOW), #endif #ifdef AT_STATX_SYNC_AS_STAT - FLAG_GENERIC(AT_STATX_SYNC_AS_STAT), + FLAG_GENERIC_MASK(AT_STATX_SYNC_AS_STAT, AT_STATX_SYNC_TYPE), #endif #ifdef AT_STATX_FORCE_SYNC - FLAG_GENERIC(AT_STATX_FORCE_SYNC), + FLAG_GENERIC_MASK(AT_STATX_FORCE_SYNC, AT_STATX_SYNC_TYPE), #endif #ifdef AT_STATX_DONT_SYNC - FLAG_GENERIC(AT_STATX_DONT_SYNC), + FLAG_GENERIC_MASK(AT_STATX_DONT_SYNC, AT_STATX_SYNC_TYPE), #endif FLAG_END, }; @@ -1481,14 +1489,10 @@ print_flags(const struct flags *f, abi_long flags, int last) const char *sep = ""; int n; - if ((flags == 0) && (f->f_value == 0)) { - qemu_log("%s%s", f->f_string, get_comma(last)); - return; - } for (n = 0; f->f_string != NULL; f++) { - if ((f->f_value != 0) && ((flags & f->f_value) == f->f_value)) { + if ((flags & f->f_mask) == f->f_value) { qemu_log("%s%s", sep, f->f_string); - flags &= ~f->f_value; + flags &= ~f->f_mask; sep = "|"; n++; }