From 9cf12d57c58a82cfe3e6fee26d1ea55dfe49f9c4 Mon Sep 17 00:00:00 2001 From: Pedro Alves Date: Tue, 26 Jul 2016 19:35:40 +0100 Subject: [PATCH] Fix PR gdb/20287 - x32 and "gdb_static_assert (sizeof (nat_siginfo_t) == sizeof (siginfo_t))" MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Building an x32 gdb trips on a static assertion: In file included from .../src/gdb/common/common-defs.h:71:0, from .../src/gdb/nat/amd64-linux-siginfo.c:21: .../src/gdb/common/gdb_assert.h:26:66: error: size of array ‘never_defined_just_used_for_checking’ is negative extern int never_defined_just_used_for_checking[(expr) ? 1 : -1] ^ .../src/gdb/nat/amd64-linux-siginfo.c:113:1: note: in expansion of macro ‘gdb_static_assert’ gdb_static_assert (sizeof (nat_siginfo_t) == sizeof (siginfo_t)); ^ The problem is that the way nat_siginfo_t is defined, it can only match the host's siginfo_t object when gdb is built as a 64-bit program. Several bits of nat_siginfo_t are off: - nat_siginfo_t's _pad field's definition is: int _pad[((128 / sizeof (int)) - 4)]; while /usr/include/bits/siginfo.h has: # define __SI_MAX_SIZE 128 # if __WORDSIZE == 64 # define __SI_PAD_SIZE ((__SI_MAX_SIZE / sizeof (int)) - 4) # else # define __SI_PAD_SIZE ((__SI_MAX_SIZE / sizeof (int)) - 3) # endif and __WORDSIZE == 32 for x32. This is what causes the size of nat_siginfo_t to be wrong and the assertion to fail. - the nat_clock_t type is incorrect for 64-bit. We have this: /* For native 64-bit, clock_t in _sigchld is 64bit aligned at 4 bytes. */ typedef long __attribute__ ((__aligned__ (4))) nat_clock_t; however, /usr/include/bits/siginfo.h has: # if defined __x86_64__ && __WORDSIZE == 32 /* si_utime and si_stime must be 4 byte aligned for x32 to match the kernel. We align siginfo_t to 8 bytes so that si_utime and si_stime are actually aligned to 8 bytes since their offsets are multiple of 8 bytes. */ typedef __clock_t __attribute__ ((__aligned__ (4))) __sigchld_clock_t; # define __SI_ALIGNMENT __attribute__ ((__aligned__ (8))) # else typedef __clock_t __sigchld_clock_t; # define __SI_ALIGNMENT # endif So we're currently forcing 4-byte alignment on clock_t, when it should only be so for x32, not 64-bit. The fix: - Leaves nat_siginfo_t strictly for the 64-bit ABI. - Adds a new typedef for the siginfo type that ptrace uses (ptrace_siginfo_t). An x32 gdb always gets/sets an x32 siginfo_t type with PTRACE_GETSIGINFO/PTRACE_SETSIGINFO. - Uses this new ptrace_siginfo_t type instead of nat_siginfo_t as the intermediate conversion type. gdb/ChangeLog: 2016-07-26 Pedro Alves * amd64-linux-nat.c (amd64_linux_siginfo_fixup): Rename 'native' parameter to 'ptrace'. * nat/amd64-linux-siginfo.c (GDB_SI_SIZE): New define. (nat_uptr_t): New an unsigned long. (nat_clock_t): Remove attribute __aligned__. (struct nat_timeval): Delete. (nat_siginfo_t): Remove attribute __aligned__. (ptrace_siginfo_t): Define. (compat_siginfo_from_siginfo, siginfo_from_compat_siginfo) (compat_x32_siginfo_from_siginfo) (siginfo_from_compat_x32_siginfo): Make 'from' parameter const. Convert through a ptrace_siginfo_t instead of a nat_siginfo_t. Remove casts. (amd64_linux_siginfo_fixup_common): Rename 'native' parameter to 'ptrace'. Remove static assertions. (top level): New static assertions. gdb/gdbserver/ChangeLog: 2016-07-26 Pedro Alves * linux-x86-low.c (x86_siginfo_fixup): Rename 'native' parameter to 'ptrace'. --- gdb/ChangeLog | 19 +++ gdb/amd64-linux-nat.c | 10 +- gdb/gdbserver/ChangeLog | 5 + gdb/gdbserver/linux-x86-low.c | 10 +- gdb/nat/amd64-linux-siginfo.c | 298 ++++++++++++++++++---------------- 5 files changed, 193 insertions(+), 149 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 394018844d9..3a5e8707a3c 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,22 @@ +2016-07-26 Pedro Alves + + * amd64-linux-nat.c (amd64_linux_siginfo_fixup): Rename 'native' + parameter to 'ptrace'. + * nat/amd64-linux-siginfo.c (GDB_SI_SIZE): New define. + (nat_uptr_t): New an unsigned long. + (nat_clock_t): Remove attribute __aligned__. + (struct nat_timeval): Delete. + (nat_siginfo_t): Remove attribute __aligned__. + (ptrace_siginfo_t): Define. + (compat_siginfo_from_siginfo, siginfo_from_compat_siginfo) + (compat_x32_siginfo_from_siginfo) + (siginfo_from_compat_x32_siginfo): Make 'from' parameter const. + Convert through a ptrace_siginfo_t instead of a nat_siginfo_t. + Remove casts. + (amd64_linux_siginfo_fixup_common): Rename 'native' parameter to + 'ptrace'. Remove static assertions. + (top level): New static assertions. + 2016-07-25 Simon Marchi * top.h (make_delete_ui_cleanup): New declaration. diff --git a/gdb/amd64-linux-nat.c b/gdb/amd64-linux-nat.c index 391a646992b..fea6ee2fbdc 100644 --- a/gdb/amd64-linux-nat.c +++ b/gdb/amd64-linux-nat.c @@ -321,25 +321,25 @@ ps_get_thread_area (const struct ps_prochandle *ph, } -/* Convert a native/host siginfo object, into/from the siginfo in the +/* Convert a ptrace/host siginfo object, into/from the siginfo in the layout of the inferiors' architecture. Returns true if any conversion was done; false otherwise. If DIRECTION is 1, then copy - from INF to NATIVE. If DIRECTION is 0, copy from NATIVE to + from INF to PTRACE. If DIRECTION is 0, copy from PTRACE to INF. */ static int -amd64_linux_siginfo_fixup (siginfo_t *native, gdb_byte *inf, int direction) +amd64_linux_siginfo_fixup (siginfo_t *ptrace, gdb_byte *inf, int direction) { struct gdbarch *gdbarch = get_frame_arch (get_current_frame ()); /* Is the inferior 32-bit? If so, then do fixup the siginfo object. */ if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) - return amd64_linux_siginfo_fixup_common (native, inf, direction, + return amd64_linux_siginfo_fixup_common (ptrace, inf, direction, FIXUP_32); /* No fixup for native x32 GDB. */ else if (gdbarch_addr_bit (gdbarch) == 32 && sizeof (void *) == 8) - return amd64_linux_siginfo_fixup_common (native, inf, direction, + return amd64_linux_siginfo_fixup_common (ptrace, inf, direction, FIXUP_X32); else return 0; diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog index 349af82c7eb..5e6fb7e105b 100644 --- a/gdb/gdbserver/ChangeLog +++ b/gdb/gdbserver/ChangeLog @@ -1,3 +1,8 @@ +2016-07-26 Pedro Alves + + * linux-x86-low.c (x86_siginfo_fixup): Rename 'native' parameter + to 'ptrace'. + 2016-07-21 Tom Tromey * configure: Rebuild. diff --git a/gdb/gdbserver/linux-x86-low.c b/gdb/gdbserver/linux-x86-low.c index 5080decbbd8..4e6dbce6a49 100644 --- a/gdb/gdbserver/linux-x86-low.c +++ b/gdb/gdbserver/linux-x86-low.c @@ -624,14 +624,14 @@ x86_debug_reg_state (pid_t pid) as debugging it with a 32-bit GDBSERVER, we do the 32-bit <-> 64-bit conversion in-place ourselves. */ -/* Convert a native/host siginfo object, into/from the siginfo in the +/* Convert a ptrace/host siginfo object, into/from the siginfo in the layout of the inferiors' architecture. Returns true if any conversion was done; false otherwise. If DIRECTION is 1, then copy - from INF to NATIVE. If DIRECTION is 0, copy from NATIVE to + from INF to PTRACE. If DIRECTION is 0, copy from PTRACE to INF. */ static int -x86_siginfo_fixup (siginfo_t *native, gdb_byte *inf, int direction) +x86_siginfo_fixup (siginfo_t *ptrace, gdb_byte *inf, int direction) { #ifdef __x86_64__ unsigned int machine; @@ -640,11 +640,11 @@ x86_siginfo_fixup (siginfo_t *native, gdb_byte *inf, int direction) /* Is the inferior 32-bit? If so, then fixup the siginfo object. */ if (!is_64bit_tdesc ()) - return amd64_linux_siginfo_fixup_common (native, inf, direction, + return amd64_linux_siginfo_fixup_common (ptrace, inf, direction, FIXUP_32); /* No fixup for native x32 GDB. */ else if (!is_elf64 && sizeof (void *) == 8) - return amd64_linux_siginfo_fixup_common (native, inf, direction, + return amd64_linux_siginfo_fixup_common (ptrace, inf, direction, FIXUP_X32); #endif diff --git a/gdb/nat/amd64-linux-siginfo.c b/gdb/nat/amd64-linux-siginfo.c index 72b30422b41..9f7df0c4f16 100644 --- a/gdb/nat/amd64-linux-siginfo.c +++ b/gdb/nat/amd64-linux-siginfo.c @@ -21,23 +21,29 @@ #include "common-defs.h" #include "amd64-linux-siginfo.h" -/* The nat_* types below define the most complete kernel siginfo type - known for the architecture, independent of the system/libc headers. */ +#define GDB_SI_SIZE 128 + +/* The types below define the most complete kernel siginfo types known + for the architecture, independent of the system/libc headers. They + are named from a 64-bit kernel's perspective: + + | layout | type | + |--------+----------------------| + | 64-bit | nat_siginfo_t | + | 32-bit | compat_siginfo_t | + | x32 | compat_x32_siginfo_t | +*/ + +#ifndef __ILP32__ typedef int nat_int_t; -typedef void* nat_uptr_t; +typedef unsigned long nat_uptr_t; typedef int nat_time_t; typedef int nat_timer_t; -/* For native 64-bit, clock_t in _sigchld is 64bit aligned at 4 bytes. */ -typedef long __attribute__ ((__aligned__ (4))) nat_clock_t; - -struct nat_timeval -{ - nat_time_t tv_sec; - int tv_usec; -}; +/* For native 64-bit, clock_t in _sigchld is 64-bit. */ +typedef long nat_clock_t; typedef union nat_sigval { @@ -106,11 +112,9 @@ typedef struct nat_siginfo int _fd; } _sigpoll; } _sifields; -} nat_siginfo_t __attribute__ ((__aligned__ (8))); - -/* Sanity check for the siginfo structure size. */ +} nat_siginfo_t; -gdb_static_assert (sizeof (nat_siginfo_t) == sizeof (siginfo_t)); +#endif /* __ILP32__ */ /* These types below (compat_*) define a siginfo type that is layout compatible with the siginfo type exported by the 32-bit userspace @@ -286,62 +290,71 @@ typedef struct compat_x32_siginfo #define si_overrun si_timer2 #endif +/* The type of the siginfo object the kernel returns in + PTRACE_GETSIGINFO. If gdb is built as a x32 program, we get a x32 + siginfo. */ +#ifdef __ILP32__ +typedef compat_x32_siginfo_t ptrace_siginfo_t; +#else +typedef nat_siginfo_t ptrace_siginfo_t; +#endif + /* Convert the system provided siginfo into compatible siginfo. */ static void -compat_siginfo_from_siginfo (compat_siginfo_t *to, siginfo_t *from) +compat_siginfo_from_siginfo (compat_siginfo_t *to, const siginfo_t *from) { - nat_siginfo_t from_nat; + ptrace_siginfo_t from_ptrace; - memcpy (&from_nat, from, sizeof (from_nat)); + memcpy (&from_ptrace, from, sizeof (from_ptrace)); memset (to, 0, sizeof (*to)); - to->si_signo = from_nat.si_signo; - to->si_errno = from_nat.si_errno; - to->si_code = from_nat.si_code; + to->si_signo = from_ptrace.si_signo; + to->si_errno = from_ptrace.si_errno; + to->si_code = from_ptrace.si_code; if (to->si_code == SI_TIMER) { - to->cpt_si_timerid = from_nat.cpt_si_timerid; - to->cpt_si_overrun = from_nat.cpt_si_overrun; - to->cpt_si_ptr = (intptr_t) from_nat.cpt_si_ptr; + to->cpt_si_timerid = from_ptrace.cpt_si_timerid; + to->cpt_si_overrun = from_ptrace.cpt_si_overrun; + to->cpt_si_ptr = from_ptrace.cpt_si_ptr; } else if (to->si_code == SI_USER) { - to->cpt_si_pid = from_nat.cpt_si_pid; - to->cpt_si_uid = from_nat.cpt_si_uid; + to->cpt_si_pid = from_ptrace.cpt_si_pid; + to->cpt_si_uid = from_ptrace.cpt_si_uid; } else if (to->si_code < 0) { - to->cpt_si_pid = from_nat.cpt_si_pid; - to->cpt_si_uid = from_nat.cpt_si_uid; - to->cpt_si_ptr = (intptr_t) from_nat.cpt_si_ptr; + to->cpt_si_pid = from_ptrace.cpt_si_pid; + to->cpt_si_uid = from_ptrace.cpt_si_uid; + to->cpt_si_ptr = from_ptrace.cpt_si_ptr; } else { switch (to->si_signo) { case SIGCHLD: - to->cpt_si_pid = from_nat.cpt_si_pid; - to->cpt_si_uid = from_nat.cpt_si_uid; - to->cpt_si_status = from_nat.cpt_si_status; - to->cpt_si_utime = from_nat.cpt_si_utime; - to->cpt_si_stime = from_nat.cpt_si_stime; + to->cpt_si_pid = from_ptrace.cpt_si_pid; + to->cpt_si_uid = from_ptrace.cpt_si_uid; + to->cpt_si_status = from_ptrace.cpt_si_status; + to->cpt_si_utime = from_ptrace.cpt_si_utime; + to->cpt_si_stime = from_ptrace.cpt_si_stime; break; case SIGILL: case SIGFPE: case SIGSEGV: case SIGBUS: - to->cpt_si_addr = (intptr_t) from_nat.cpt_si_addr; + to->cpt_si_addr = from_ptrace.cpt_si_addr; break; case SIGPOLL: - to->cpt_si_band = from_nat.cpt_si_band; - to->cpt_si_fd = from_nat.cpt_si_fd; + to->cpt_si_band = from_ptrace.cpt_si_band; + to->cpt_si_fd = from_ptrace.cpt_si_fd; break; default: - to->cpt_si_pid = from_nat.cpt_si_pid; - to->cpt_si_uid = from_nat.cpt_si_uid; - to->cpt_si_ptr = (intptr_t) from_nat.cpt_si_ptr; + to->cpt_si_pid = from_ptrace.cpt_si_pid; + to->cpt_si_uid = from_ptrace.cpt_si_uid; + to->cpt_si_ptr = from_ptrace.cpt_si_ptr; break; } } @@ -350,124 +363,124 @@ compat_siginfo_from_siginfo (compat_siginfo_t *to, siginfo_t *from) /* Convert the compatible siginfo into system siginfo. */ static void -siginfo_from_compat_siginfo (siginfo_t *to, compat_siginfo_t *from) +siginfo_from_compat_siginfo (siginfo_t *to, const compat_siginfo_t *from) { - nat_siginfo_t to_nat; + ptrace_siginfo_t to_ptrace; - memset (&to_nat, 0, sizeof (to_nat)); + memset (&to_ptrace, 0, sizeof (to_ptrace)); - to_nat.si_signo = from->si_signo; - to_nat.si_errno = from->si_errno; - to_nat.si_code = from->si_code; + to_ptrace.si_signo = from->si_signo; + to_ptrace.si_errno = from->si_errno; + to_ptrace.si_code = from->si_code; - if (to_nat.si_code == SI_TIMER) + if (to_ptrace.si_code == SI_TIMER) { - to_nat.cpt_si_timerid = from->cpt_si_timerid; - to_nat.cpt_si_overrun = from->cpt_si_overrun; - to_nat.cpt_si_ptr = (void *) (intptr_t) from->cpt_si_ptr; + to_ptrace.cpt_si_timerid = from->cpt_si_timerid; + to_ptrace.cpt_si_overrun = from->cpt_si_overrun; + to_ptrace.cpt_si_ptr = from->cpt_si_ptr; } - else if (to_nat.si_code == SI_USER) + else if (to_ptrace.si_code == SI_USER) { - to_nat.cpt_si_pid = from->cpt_si_pid; - to_nat.cpt_si_uid = from->cpt_si_uid; + to_ptrace.cpt_si_pid = from->cpt_si_pid; + to_ptrace.cpt_si_uid = from->cpt_si_uid; } - if (to_nat.si_code < 0) + if (to_ptrace.si_code < 0) { - to_nat.cpt_si_pid = from->cpt_si_pid; - to_nat.cpt_si_uid = from->cpt_si_uid; - to_nat.cpt_si_ptr = (void *) (intptr_t) from->cpt_si_ptr; + to_ptrace.cpt_si_pid = from->cpt_si_pid; + to_ptrace.cpt_si_uid = from->cpt_si_uid; + to_ptrace.cpt_si_ptr = from->cpt_si_ptr; } else { - switch (to_nat.si_signo) + switch (to_ptrace.si_signo) { case SIGCHLD: - to_nat.cpt_si_pid = from->cpt_si_pid; - to_nat.cpt_si_uid = from->cpt_si_uid; - to_nat.cpt_si_status = from->cpt_si_status; - to_nat.cpt_si_utime = from->cpt_si_utime; - to_nat.cpt_si_stime = from->cpt_si_stime; + to_ptrace.cpt_si_pid = from->cpt_si_pid; + to_ptrace.cpt_si_uid = from->cpt_si_uid; + to_ptrace.cpt_si_status = from->cpt_si_status; + to_ptrace.cpt_si_utime = from->cpt_si_utime; + to_ptrace.cpt_si_stime = from->cpt_si_stime; break; case SIGILL: case SIGFPE: case SIGSEGV: case SIGBUS: - to_nat.cpt_si_addr = (void *) (intptr_t) from->cpt_si_addr; - to_nat.cpt_si_addr_lsb = (short) from->cpt_si_addr_lsb; + to_ptrace.cpt_si_addr = from->cpt_si_addr; + to_ptrace.cpt_si_addr_lsb = from->cpt_si_addr_lsb; break; case SIGPOLL: - to_nat.cpt_si_band = from->cpt_si_band; - to_nat.cpt_si_fd = from->cpt_si_fd; + to_ptrace.cpt_si_band = from->cpt_si_band; + to_ptrace.cpt_si_fd = from->cpt_si_fd; break; default: - to_nat.cpt_si_pid = from->cpt_si_pid; - to_nat.cpt_si_uid = from->cpt_si_uid; - to_nat.cpt_si_ptr = (void* ) (intptr_t) from->cpt_si_ptr; + to_ptrace.cpt_si_pid = from->cpt_si_pid; + to_ptrace.cpt_si_uid = from->cpt_si_uid; + to_ptrace.cpt_si_ptr = from->cpt_si_ptr; break; } } - memcpy (to, &to_nat, sizeof (to_nat)); + memcpy (to, &to_ptrace, sizeof (to_ptrace)); } /* Convert the system provided siginfo into compatible x32 siginfo. */ static void compat_x32_siginfo_from_siginfo (compat_x32_siginfo_t *to, - siginfo_t *from) + const siginfo_t *from) { - nat_siginfo_t from_nat; + ptrace_siginfo_t from_ptrace; - memcpy (&from_nat, from, sizeof (from_nat)); + memcpy (&from_ptrace, from, sizeof (from_ptrace)); memset (to, 0, sizeof (*to)); - to->si_signo = from_nat.si_signo; - to->si_errno = from_nat.si_errno; - to->si_code = from_nat.si_code; + to->si_signo = from_ptrace.si_signo; + to->si_errno = from_ptrace.si_errno; + to->si_code = from_ptrace.si_code; if (to->si_code == SI_TIMER) { - to->cpt_si_timerid = from_nat.cpt_si_timerid; - to->cpt_si_overrun = from_nat.cpt_si_overrun; - to->cpt_si_ptr = (intptr_t) from_nat.cpt_si_ptr; + to->cpt_si_timerid = from_ptrace.cpt_si_timerid; + to->cpt_si_overrun = from_ptrace.cpt_si_overrun; + to->cpt_si_ptr = from_ptrace.cpt_si_ptr; } else if (to->si_code == SI_USER) { - to->cpt_si_pid = from_nat.cpt_si_pid; - to->cpt_si_uid = from_nat.cpt_si_uid; + to->cpt_si_pid = from_ptrace.cpt_si_pid; + to->cpt_si_uid = from_ptrace.cpt_si_uid; } else if (to->si_code < 0) { - to->cpt_si_pid = from_nat.cpt_si_pid; - to->cpt_si_uid = from_nat.cpt_si_uid; - to->cpt_si_ptr = (intptr_t) from_nat.cpt_si_ptr; + to->cpt_si_pid = from_ptrace.cpt_si_pid; + to->cpt_si_uid = from_ptrace.cpt_si_uid; + to->cpt_si_ptr = from_ptrace.cpt_si_ptr; } else { switch (to->si_signo) { case SIGCHLD: - to->cpt_si_pid = from_nat.cpt_si_pid; - to->cpt_si_uid = from_nat.cpt_si_uid; - to->cpt_si_status = from_nat.cpt_si_status; - memcpy (&to->cpt_si_utime, &from_nat.cpt_si_utime, + to->cpt_si_pid = from_ptrace.cpt_si_pid; + to->cpt_si_uid = from_ptrace.cpt_si_uid; + to->cpt_si_status = from_ptrace.cpt_si_status; + memcpy (&to->cpt_si_utime, &from_ptrace.cpt_si_utime, sizeof (to->cpt_si_utime)); - memcpy (&to->cpt_si_stime, &from_nat.cpt_si_stime, + memcpy (&to->cpt_si_stime, &from_ptrace.cpt_si_stime, sizeof (to->cpt_si_stime)); break; case SIGILL: case SIGFPE: case SIGSEGV: case SIGBUS: - to->cpt_si_addr = (intptr_t) from_nat.cpt_si_addr; + to->cpt_si_addr = from_ptrace.cpt_si_addr; break; case SIGPOLL: - to->cpt_si_band = from_nat.cpt_si_band; - to->cpt_si_fd = from_nat.cpt_si_fd; + to->cpt_si_band = from_ptrace.cpt_si_band; + to->cpt_si_fd = from_ptrace.cpt_si_fd; break; default: - to->cpt_si_pid = from_nat.cpt_si_pid; - to->cpt_si_uid = from_nat.cpt_si_uid; - to->cpt_si_ptr = (intptr_t) from_nat.cpt_si_ptr; + to->cpt_si_pid = from_ptrace.cpt_si_pid; + to->cpt_si_uid = from_ptrace.cpt_si_uid; + to->cpt_si_ptr = from_ptrace.cpt_si_ptr; break; } } @@ -479,98 +492,105 @@ compat_x32_siginfo_from_siginfo (compat_x32_siginfo_t *to, /* Convert the compatible x32 siginfo into system siginfo. */ static void siginfo_from_compat_x32_siginfo (siginfo_t *to, - compat_x32_siginfo_t *from) + const compat_x32_siginfo_t *from) { - nat_siginfo_t to_nat; + ptrace_siginfo_t to_ptrace; - memset (&to_nat, 0, sizeof (to_nat)); - to_nat.si_signo = from->si_signo; - to_nat.si_errno = from->si_errno; - to_nat.si_code = from->si_code; + memset (&to_ptrace, 0, sizeof (to_ptrace)); + to_ptrace.si_signo = from->si_signo; + to_ptrace.si_errno = from->si_errno; + to_ptrace.si_code = from->si_code; - if (to_nat.si_code == SI_TIMER) + if (to_ptrace.si_code == SI_TIMER) { - to_nat.cpt_si_timerid = from->cpt_si_timerid; - to_nat.cpt_si_overrun = from->cpt_si_overrun; - to_nat.cpt_si_ptr = (void *) (intptr_t) from->cpt_si_ptr; + to_ptrace.cpt_si_timerid = from->cpt_si_timerid; + to_ptrace.cpt_si_overrun = from->cpt_si_overrun; + to_ptrace.cpt_si_ptr = from->cpt_si_ptr; } - else if (to_nat.si_code == SI_USER) + else if (to_ptrace.si_code == SI_USER) { - to_nat.cpt_si_pid = from->cpt_si_pid; - to_nat.cpt_si_uid = from->cpt_si_uid; + to_ptrace.cpt_si_pid = from->cpt_si_pid; + to_ptrace.cpt_si_uid = from->cpt_si_uid; } - if (to_nat.si_code < 0) + if (to_ptrace.si_code < 0) { - to_nat.cpt_si_pid = from->cpt_si_pid; - to_nat.cpt_si_uid = from->cpt_si_uid; - to_nat.cpt_si_ptr = (void *) (intptr_t) from->cpt_si_ptr; + to_ptrace.cpt_si_pid = from->cpt_si_pid; + to_ptrace.cpt_si_uid = from->cpt_si_uid; + to_ptrace.cpt_si_ptr = from->cpt_si_ptr; } else { - switch (to_nat.si_signo) + switch (to_ptrace.si_signo) { case SIGCHLD: - to_nat.cpt_si_pid = from->cpt_si_pid; - to_nat.cpt_si_uid = from->cpt_si_uid; - to_nat.cpt_si_status = from->cpt_si_status; - memcpy (&to_nat.cpt_si_utime, &from->cpt_si_utime, - sizeof (to_nat.cpt_si_utime)); - memcpy (&to_nat.cpt_si_stime, &from->cpt_si_stime, - sizeof (to_nat.cpt_si_stime)); + to_ptrace.cpt_si_pid = from->cpt_si_pid; + to_ptrace.cpt_si_uid = from->cpt_si_uid; + to_ptrace.cpt_si_status = from->cpt_si_status; + memcpy (&to_ptrace.cpt_si_utime, &from->cpt_si_utime, + sizeof (to_ptrace.cpt_si_utime)); + memcpy (&to_ptrace.cpt_si_stime, &from->cpt_si_stime, + sizeof (to_ptrace.cpt_si_stime)); break; case SIGILL: case SIGFPE: case SIGSEGV: case SIGBUS: - to_nat.cpt_si_addr = (void *) (intptr_t) from->cpt_si_addr; + to_ptrace.cpt_si_addr = from->cpt_si_addr; break; case SIGPOLL: - to_nat.cpt_si_band = from->cpt_si_band; - to_nat.cpt_si_fd = from->cpt_si_fd; + to_ptrace.cpt_si_band = from->cpt_si_band; + to_ptrace.cpt_si_fd = from->cpt_si_fd; break; default: - to_nat.cpt_si_pid = from->cpt_si_pid; - to_nat.cpt_si_uid = from->cpt_si_uid; - to_nat.cpt_si_ptr = (void* ) (intptr_t) from->cpt_si_ptr; + to_ptrace.cpt_si_pid = from->cpt_si_pid; + to_ptrace.cpt_si_uid = from->cpt_si_uid; + to_ptrace.cpt_si_ptr = from->cpt_si_ptr; break; } } - memcpy (to, &to_nat, sizeof (to_nat)); + memcpy (to, &to_ptrace, sizeof (to_ptrace)); } -/* Convert a native/host siginfo object, into/from the siginfo in the +/* Convert a ptrace siginfo object, into/from the siginfo in the layout of the inferiors' architecture. Returns true if any conversion was done; false otherwise. If DIRECTION is 1, then copy - from INF to NATIVE. If DIRECTION is 0, then copy from NATIVE to INF. */ + from INF to PTRACE. If DIRECTION is 0, then copy from NATIVE to + INF. */ int -amd64_linux_siginfo_fixup_common (siginfo_t *native, gdb_byte *inf, +amd64_linux_siginfo_fixup_common (siginfo_t *ptrace, gdb_byte *inf, int direction, enum amd64_siginfo_fixup_mode mode) { if (mode == FIXUP_32) { - gdb_assert (sizeof (siginfo_t) == sizeof (compat_siginfo_t)); - if (direction == 0) - compat_siginfo_from_siginfo ((struct compat_siginfo *) inf, native); + compat_siginfo_from_siginfo ((struct compat_siginfo *) inf, ptrace); else - siginfo_from_compat_siginfo (native, (struct compat_siginfo *) inf); + siginfo_from_compat_siginfo (ptrace, (struct compat_siginfo *) inf); return 1; } else if (mode == FIXUP_X32) { - gdb_assert (sizeof (siginfo_t) == sizeof (compat_x32_siginfo_t)); - if (direction == 0) compat_x32_siginfo_from_siginfo ((struct compat_x32_siginfo *) inf, - native); + ptrace); else - siginfo_from_compat_x32_siginfo (native, + siginfo_from_compat_x32_siginfo (ptrace, (struct compat_x32_siginfo *) inf); return 1; } return 0; } + +/* Sanity check for the siginfo structure sizes. */ + +gdb_static_assert (sizeof (siginfo_t) == GDB_SI_SIZE); +#ifndef __ILP32__ +gdb_static_assert (sizeof (nat_siginfo_t) == GDB_SI_SIZE); +#endif +gdb_static_assert (sizeof (compat_x32_siginfo_t) == GDB_SI_SIZE); +gdb_static_assert (sizeof (compat_siginfo_t) == GDB_SI_SIZE); +gdb_static_assert (sizeof (ptrace_siginfo_t) == GDB_SI_SIZE); -- 2.30.2