From 040baaf6deeec9f92645169f3f6e84996e23c986 Mon Sep 17 00:00:00 2001 From: Gary Benson Date: Thu, 10 Jul 2014 15:43:56 +0100 Subject: Move duplicated code into new files This commit moves the duplicated code in {i386,amd64}-linux-nat.c into the new files x86-linux-nat.[ch]. Additionally, a new file i386-linux-nat.h was required to expose a value required by the 32-bit code in x86-linux-nat.c. gdb/ 2014-07-11 Gary Benson * i386-linux-nat.h: New file. * x86-linux-nat.h: Likewise. * x86-linux-nat.c: Likewise. * Makefile.in (HFILES_NO_SRCDIR): Add the above new headers. * config/i386/linux.mh (NATDEPFILES): Add x86-linux-nat.o. * config/i386/linux64.mh (NATDEPFILES): Likewise. * amd64-linux-nat.c (x86-linux-nat.h): New include. (PTRACE_GETREGSET): Now in x86-linux-nat.h. (PTRACE_SETREGSET): Likewise. (arch_lwp_info): Now in x86-linux-nat.c. (have_ptrace_getregset): Now in x86-linux-nat.h. (x86_linux_dr_get): Now in x86-linux-nat.c. (x86_linux_dr_set): Likewise. (x86_linux_dr_get_addr): Likewise. (x86_linux_dr_get_control): Likewise. (x86_linux_dr_get_status): Likewise. (update_debug_registers_callback): Likewise. (x86_linux_dr_set_control): Likewise. (x86_linux_dr_set_addr): Likewise. (x86_linux_prepare_to_resume): Likewise. (x86_linux_new_thread): Likewise. (x86_linux_new_fork): Likewise. (x86_linux_get_thread_area): Likewise. (super_post_startup_inferior): Likewise. (x86_linux_child_post_startup_inferior): Likewise. (AMD64_LINUX_USER64_CS): Likewise. (AMD64_LINUX_X32_DS): Likewise. (x86_linux_read_description): Likewise. (x86_linux_enable_btrace): Likewise. (x86_linux_disable_btrace): Likewise. (x86_linux_teardown_btrace): Likewise. (x86_linux_read_btrace): Likewise. (x86_linux_create_target): Likewise. (x86_linux_add_target): Likewise. * i386-linux-nat.c (x86-linux-nat.h): New include. (PTRACE_GETREGSET): Now in x86-linux-nat.h. (PTRACE_SETREGSET): Likewise. (arch_lwp_info): Now in x86-linux-nat.c. (have_ptrace_getregset): Now in x86-linux-nat.h. (x86_linux_dr_get): Now in x86-linux-nat.c. (x86_linux_dr_set): Likewise. (x86_linux_dr_get_addr): Likewise. (x86_linux_dr_get_control): Likewise. (x86_linux_dr_get_status): Likewise. (update_debug_registers_callback): Likewise. (x86_linux_dr_set_control): Likewise. (x86_linux_dr_set_addr): Likewise. (x86_linux_prepare_to_resume): Likewise. (x86_linux_new_thread): Likewise. (x86_linux_new_fork): Likewise. (x86_linux_get_thread_area): Likewise. (super_post_startup_inferior): Likewise. (x86_linux_child_post_startup_inferior): Likewise. (AMD64_LINUX_USER64_CS): Likewise. (AMD64_LINUX_X32_DS): Likewise. (x86_linux_read_description): Likewise. (x86_linux_enable_btrace): Likewise. (x86_linux_disable_btrace): Likewise. (x86_linux_teardown_btrace): Likewise. (x86_linux_read_btrace): Likewise. (x86_linux_create_target): Likewise. (x86_linux_add_target): Likewise. --- gdb/ChangeLog | 65 ++++++ gdb/Makefile.in | 3 +- gdb/amd64-linux-nat.c | 535 +----------------------------------------- gdb/config/i386/linux.mh | 2 +- gdb/config/i386/linux64.mh | 1 + gdb/i386-linux-nat.c | 535 +----------------------------------------- gdb/i386-linux-nat.h | 26 +++ gdb/x86-linux-nat.c | 568 +++++++++++++++++++++++++++++++++++++++++++++ gdb/x86-linux-nat.h | 51 ++++ 9 files changed, 718 insertions(+), 1068 deletions(-) create mode 100644 gdb/i386-linux-nat.h create mode 100644 gdb/x86-linux-nat.c create mode 100644 gdb/x86-linux-nat.h (limited to 'gdb') diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 490e652..418b3e3 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,5 +1,70 @@ 2014-07-11 Gary Benson + * i386-linux-nat.h: New file. + * x86-linux-nat.h: Likewise. + * x86-linux-nat.c: Likewise. + * Makefile.in (HFILES_NO_SRCDIR): Add the above new headers. + * config/i386/linux.mh (NATDEPFILES): Add x86-linux-nat.o. + * config/i386/linux64.mh (NATDEPFILES): Likewise. + * amd64-linux-nat.c (x86-linux-nat.h): New include. + (PTRACE_GETREGSET): Now in x86-linux-nat.h. + (PTRACE_SETREGSET): Likewise. + (arch_lwp_info): Now in x86-linux-nat.c. + (have_ptrace_getregset): Now in x86-linux-nat.h. + (x86_linux_dr_get): Now in x86-linux-nat.c. + (x86_linux_dr_set): Likewise. + (x86_linux_dr_get_addr): Likewise. + (x86_linux_dr_get_control): Likewise. + (x86_linux_dr_get_status): Likewise. + (update_debug_registers_callback): Likewise. + (x86_linux_dr_set_control): Likewise. + (x86_linux_dr_set_addr): Likewise. + (x86_linux_prepare_to_resume): Likewise. + (x86_linux_new_thread): Likewise. + (x86_linux_new_fork): Likewise. + (x86_linux_get_thread_area): Likewise. + (super_post_startup_inferior): Likewise. + (x86_linux_child_post_startup_inferior): Likewise. + (AMD64_LINUX_USER64_CS): Likewise. + (AMD64_LINUX_X32_DS): Likewise. + (x86_linux_read_description): Likewise. + (x86_linux_enable_btrace): Likewise. + (x86_linux_disable_btrace): Likewise. + (x86_linux_teardown_btrace): Likewise. + (x86_linux_read_btrace): Likewise. + (x86_linux_create_target): Likewise. + (x86_linux_add_target): Likewise. + * i386-linux-nat.c (x86-linux-nat.h): New include. + (PTRACE_GETREGSET): Now in x86-linux-nat.h. + (PTRACE_SETREGSET): Likewise. + (arch_lwp_info): Now in x86-linux-nat.c. + (have_ptrace_getregset): Now in x86-linux-nat.h. + (x86_linux_dr_get): Now in x86-linux-nat.c. + (x86_linux_dr_set): Likewise. + (x86_linux_dr_get_addr): Likewise. + (x86_linux_dr_get_control): Likewise. + (x86_linux_dr_get_status): Likewise. + (update_debug_registers_callback): Likewise. + (x86_linux_dr_set_control): Likewise. + (x86_linux_dr_set_addr): Likewise. + (x86_linux_prepare_to_resume): Likewise. + (x86_linux_new_thread): Likewise. + (x86_linux_new_fork): Likewise. + (x86_linux_get_thread_area): Likewise. + (super_post_startup_inferior): Likewise. + (x86_linux_child_post_startup_inferior): Likewise. + (AMD64_LINUX_USER64_CS): Likewise. + (AMD64_LINUX_X32_DS): Likewise. + (x86_linux_read_description): Likewise. + (x86_linux_enable_btrace): Likewise. + (x86_linux_disable_btrace): Likewise. + (x86_linux_teardown_btrace): Likewise. + (x86_linux_read_btrace): Likewise. + (x86_linux_create_target): Likewise. + (x86_linux_add_target): Likewise. + +2014-07-11 Gary Benson + * amd64-linux-nat.c: Comment and whitespace changes. * i386-linux-nat.c: Comment and whitespace changes. diff --git a/gdb/Makefile.in b/gdb/Makefile.in index 8838e99..ce15501 100644 --- a/gdb/Makefile.in +++ b/gdb/Makefile.in @@ -934,7 +934,8 @@ nat/linux-osdata.h gdb-dlfcn.h auto-load.h probe.h stap-probe.h \ gdb_bfd.h sparc-ravenscar-thread.h ppc-ravenscar-thread.h nat/linux-btrace.h \ ctf.h nat/i386-cpuid.h nat/i386-gcc-cpuid.h target/resume.h \ target/wait.h target/waitstatus.h nat/linux-nat.h nat/linux-waitpid.h \ -common/print-utils.h common/rsp-low.h nat/i386-dregs.h +common/print-utils.h common/rsp-low.h nat/i386-dregs.h x86-linux-nat.h \ +i386-linux-nat.h # Header files that already have srcdir in them, or which are in objdir. diff --git a/gdb/amd64-linux-nat.c b/gdb/amd64-linux-nat.c index 42af924..6b8d43a 100644 --- a/gdb/amd64-linux-nat.c +++ b/gdb/amd64-linux-nat.c @@ -58,24 +58,7 @@ #include "i386-nat.h" #include "i386-xstate.h" -#ifndef PTRACE_GETREGSET -#define PTRACE_GETREGSET 0x4204 -#endif - -#ifndef PTRACE_SETREGSET -#define PTRACE_SETREGSET 0x4205 -#endif - -/* Per-thread arch-specific data we want to keep. */ - -struct arch_lwp_info -{ - /* Non-zero if our copy differs from what's recorded in the thread. */ - int debug_registers_changed; -}; - -/* Does the current host support PTRACE_GETREGSET? */ -static int have_ptrace_getregset = -1; +#include "x86-linux-nat.h" /* Mapping between the general-purpose registers in GNU/Linux x86-64 `struct user' format and GDB's register cache layout for GNU/Linux @@ -278,262 +261,6 @@ amd64_linux_store_inferior_registers (struct target_ops *ops, } -/* Support for debug registers. */ - -/* Get debug register REGNUM value from only the one LWP of PTID. */ - -static unsigned long -x86_linux_dr_get (ptid_t ptid, int regnum) -{ - int tid; - unsigned long value; - - tid = ptid_get_lwp (ptid); - if (tid == 0) - tid = ptid_get_pid (ptid); - - errno = 0; - value = ptrace (PTRACE_PEEKUSER, tid, - offsetof (struct user, u_debugreg[regnum]), 0); - if (errno != 0) - perror_with_name (_("Couldn't read debug register")); - - return value; -} - -/* Set debug register REGNUM to VALUE in only the one LWP of PTID. */ - -static void -x86_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) -{ - int tid; - - tid = ptid_get_lwp (ptid); - if (tid == 0) - tid = ptid_get_pid (ptid); - - errno = 0; - ptrace (PTRACE_POKEUSER, tid, - offsetof (struct user, u_debugreg[regnum]), value); - if (errno != 0) - perror_with_name (_("Couldn't write debug register")); -} - -/* Return the inferior's debug register REGNUM. */ - -static CORE_ADDR -x86_linux_dr_get_addr (int regnum) -{ - /* DR6 and DR7 are retrieved with some other way. */ - gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR); - - return x86_linux_dr_get (inferior_ptid, regnum); -} - -/* Return the inferior's DR7 debug control register. */ - -static unsigned long -x86_linux_dr_get_control (void) -{ - return x86_linux_dr_get (inferior_ptid, DR_CONTROL); -} - -/* Get DR_STATUS from only the one LWP of INFERIOR_PTID. */ - -static unsigned long -x86_linux_dr_get_status (void) -{ - return x86_linux_dr_get (inferior_ptid, DR_STATUS); -} - -/* Callback for iterate_over_lwps. Update the debug registers of - LWP. */ - -static int -update_debug_registers_callback (struct lwp_info *lwp, void *arg) -{ - if (lwp->arch_private == NULL) - lwp->arch_private = XCNEW (struct arch_lwp_info); - - /* The actual update is done later just before resuming the lwp, we - just mark that the registers need updating. */ - lwp->arch_private->debug_registers_changed = 1; - - /* If the lwp isn't stopped, force it to momentarily pause, so we - can update its debug registers. */ - if (!lwp->stopped) - linux_stop_lwp (lwp); - - /* Continue the iteration. */ - return 0; -} - -/* Set DR_CONTROL to CONTROL in all LWPs of the current inferior. */ - -static void -x86_linux_dr_set_control (unsigned long control) -{ - ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); - - iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL); -} - -/* Set address REGNUM (zero based) to ADDR in all LWPs of the current - inferior. */ - -static void -x86_linux_dr_set_addr (int regnum, CORE_ADDR addr) -{ - ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); - - gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); - - iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL); -} - -/* Called when resuming a thread. - If the debug regs have changed, update the thread's copies. */ - -static void -x86_linux_prepare_to_resume (struct lwp_info *lwp) -{ - int clear_status = 0; - - /* NULL means this is the main thread still going through the shell, - or, no watchpoint has been set yet. In that case, there's - nothing to do. */ - if (lwp->arch_private == NULL) - return; - - if (lwp->arch_private->debug_registers_changed) - { - struct i386_debug_reg_state *state - = i386_debug_reg_state (ptid_get_pid (lwp->ptid)); - int i; - - /* On Linux kernel before 2.6.33 commit - 72f674d203cd230426437cdcf7dd6f681dad8b0d - if you enable a breakpoint by the DR_CONTROL bits you need to have - already written the corresponding DR_FIRSTADDR...DR_LASTADDR registers. - - Ensure DR_CONTROL gets written as the very last register here. */ - - /* Clear DR_CONTROL first. In some cases, setting DR0-3 to a - value that doesn't match what is enabled in DR_CONTROL - results in EINVAL. */ - x86_linux_dr_set (lwp->ptid, DR_CONTROL, 0); - - for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) - if (state->dr_ref_count[i] > 0) - { - x86_linux_dr_set (lwp->ptid, i, state->dr_mirror[i]); - - /* If we're setting a watchpoint, any change the inferior - had done itself to the debug registers needs to be - discarded, otherwise, i386_stopped_data_address can get - confused. */ - clear_status = 1; - } - - /* If DR_CONTROL is supposed to be zero, we've already set it - above. */ - if (state->dr_control_mirror != 0) - x86_linux_dr_set (lwp->ptid, DR_CONTROL, state->dr_control_mirror); - - lwp->arch_private->debug_registers_changed = 0; - } - - if (clear_status || lwp->stopped_by_watchpoint) - x86_linux_dr_set (lwp->ptid, DR_STATUS, 0); -} - -static void -x86_linux_new_thread (struct lwp_info *lp) -{ - struct arch_lwp_info *info = XCNEW (struct arch_lwp_info); - - info->debug_registers_changed = 1; - - lp->arch_private = info; -} - -/* linux_nat_new_fork hook. */ - -static void -x86_linux_new_fork (struct lwp_info *parent, pid_t child_pid) -{ - pid_t parent_pid; - struct i386_debug_reg_state *parent_state; - struct i386_debug_reg_state *child_state; - - /* NULL means no watchpoint has ever been set in the parent. In - that case, there's nothing to do. */ - if (parent->arch_private == NULL) - return; - - /* Linux kernel before 2.6.33 commit - 72f674d203cd230426437cdcf7dd6f681dad8b0d - will inherit hardware debug registers from parent - on fork/vfork/clone. Newer Linux kernels create such tasks with - zeroed debug registers. - - GDB core assumes the child inherits the watchpoints/hw - breakpoints of the parent, and will remove them all from the - forked off process. Copy the debug registers mirrors into the - new process so that all breakpoints and watchpoints can be - removed together. The debug registers mirror will become zeroed - in the end before detaching the forked off process, thus making - this compatible with older Linux kernels too. */ - - parent_pid = ptid_get_pid (parent->ptid); - parent_state = i386_debug_reg_state (parent_pid); - child_state = i386_debug_reg_state (child_pid); - *child_state = *parent_state; -} - - - -/* Helper for ps_get_thread_area. Sets BASE_ADDR to a pointer to - the thread local storage (or its descriptor) and returns PS_OK - on success. Returns PS_ERR on failure. */ - -static ps_err_e -x86_linux_get_thread_area (pid_t pid, void *addr, unsigned int *base_addr) -{ - /* NOTE: cagney/2003-08-26: The definition of this buffer is found - in the kernel header . It, after padding, is 4 x - 4 byte integers in size: `entry_number', `base_addr', `limit', - and a bunch of status bits. - - The values returned by this ptrace call should be part of the - regcache buffer, and ps_get_thread_area should channel its - request through the regcache. That way remote targets could - provide the value using the remote protocol and not this direct - call. - - Is this function needed? I'm guessing that the `base' is the - address of a descriptor that libthread_db uses to find the - thread local address base that GDB needs. Perhaps that - descriptor is defined by the ABI. Anyway, given that - libthread_db calls this function without prompting (gdb - requesting tls base) I guess it needs info in there anyway. */ - unsigned int desc[4]; - - /* This code assumes that "int" is 32 bits and that - GET_THREAD_AREA returns no more than 4 int values. */ - gdb_assert (sizeof (int) == 4); - -#ifndef PTRACE_GET_THREAD_AREA -#define PTRACE_GET_THREAD_AREA 25 -#endif - - if (ptrace (PTRACE_GET_THREAD_AREA, pid, addr, &desc) < 0) - return PS_ERR; - - *base_addr = desc[1]; - return PS_OK; -} - /* This function is called by libthread_db as part of its handling of a request for a thread's local storage address. */ @@ -614,17 +341,6 @@ ps_get_thread_area (const struct ps_prochandle *ph, } -static void (*super_post_startup_inferior) (struct target_ops *self, - ptid_t ptid); - -static void -x86_linux_child_post_startup_inferior (struct target_ops *self, ptid_t ptid) -{ - i386_cleanup_dregs (); - super_post_startup_inferior (self, ptid); -} - - /* When GDB is built as a 64-bit application on linux, the PTRACE_GETSIGINFO data is always presented in 64-bit layout. Since debugging a 32-bit inferior with a 64-bit GDB should look the same @@ -1069,254 +785,7 @@ amd64_linux_siginfo_fixup (siginfo_t *native, gdb_byte *inf, int direction) else return 0; } - -#ifdef __x86_64__ -/* Value of CS segment register: - 64bit process: 0x33 - 32bit process: 0x23 */ -#define AMD64_LINUX_USER64_CS 0x33 - -/* Value of DS segment register: - LP64 process: 0x0 - X32 process: 0x2b */ -#define AMD64_LINUX_X32_DS 0x2b -#endif - -/* Get Linux/x86 target description from running target. */ - -static const struct target_desc * -x86_linux_read_description (struct target_ops *ops) -{ - int tid; - int is_64bit = 0; -#ifdef __x86_64__ - int is_x32; -#endif - static uint64_t xcr0; - uint64_t xcr0_features_bits; - - /* GNU/Linux LWP ID's are process ID's. */ - tid = ptid_get_lwp (inferior_ptid); - if (tid == 0) - tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ - -#ifdef __x86_64__ - { - unsigned long cs; - unsigned long ds; - - /* Get CS register. */ - errno = 0; - cs = ptrace (PTRACE_PEEKUSER, tid, - offsetof (struct user_regs_struct, cs), 0); - if (errno != 0) - perror_with_name (_("Couldn't get CS register")); - - is_64bit = cs == AMD64_LINUX_USER64_CS; - - /* Get DS register. */ - errno = 0; - ds = ptrace (PTRACE_PEEKUSER, tid, - offsetof (struct user_regs_struct, ds), 0); - if (errno != 0) - perror_with_name (_("Couldn't get DS register")); - - is_x32 = ds == AMD64_LINUX_X32_DS; - - if (sizeof (void *) == 4 && is_64bit && !is_x32) - error (_("Can't debug 64-bit process with 32-bit GDB")); - } -#elif HAVE_PTRACE_GETFPXREGS - if (have_ptrace_getfpxregs == -1) - { - elf_fpxregset_t fpxregs; - - if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) - { - have_ptrace_getfpxregs = 0; - have_ptrace_getregset = 0; - return tdesc_i386_mmx_linux; - } - } -#endif - - if (have_ptrace_getregset == -1) - { - uint64_t xstateregs[(I386_XSTATE_SSE_SIZE / sizeof (uint64_t))]; - struct iovec iov; - - iov.iov_base = xstateregs; - iov.iov_len = sizeof (xstateregs); - - /* Check if PTRACE_GETREGSET works. */ - if (ptrace (PTRACE_GETREGSET, tid, - (unsigned int) NT_X86_XSTATE, &iov) < 0) - have_ptrace_getregset = 0; - else - { - have_ptrace_getregset = 1; - - /* Get XCR0 from XSAVE extended state. */ - xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET - / sizeof (uint64_t))]; - } - } - - /* Check the native XCR0 only if PTRACE_GETREGSET is available. If - PTRACE_GETREGSET is not available then set xcr0_features_bits to - zero so that the "no-features" descriptions are returned by the - switches below. */ - if (have_ptrace_getregset) - xcr0_features_bits = xcr0 & I386_XSTATE_ALL_MASK; - else - xcr0_features_bits = 0; - - if (is_64bit) - { -#ifdef __x86_64__ - switch (xcr0_features_bits) - { - case I386_XSTATE_MPX_AVX512_MASK: - case I386_XSTATE_AVX512_MASK: - if (is_x32) - return tdesc_x32_avx512_linux; - else - return tdesc_amd64_avx512_linux; - case I386_XSTATE_MPX_MASK: - if (is_x32) - return tdesc_x32_avx_linux; /* No MPX on x32 using AVX. */ - else - return tdesc_amd64_mpx_linux; - case I386_XSTATE_AVX_MASK: - if (is_x32) - return tdesc_x32_avx_linux; - else - return tdesc_amd64_avx_linux; - default: - if (is_x32) - return tdesc_x32_linux; - else - return tdesc_amd64_linux; - } -#endif - } - else - { - switch (xcr0_features_bits) - { - case I386_XSTATE_MPX_AVX512_MASK: - case I386_XSTATE_AVX512_MASK: - return tdesc_i386_avx512_linux; - case I386_XSTATE_MPX_MASK: - return tdesc_i386_mpx_linux; - case I386_XSTATE_AVX_MASK: - return tdesc_i386_avx_linux; - default: - return tdesc_i386_linux; - } - } - - gdb_assert_not_reached ("failed to return tdesc"); -} - -/* Enable branch tracing. */ - -static struct btrace_target_info * -x86_linux_enable_btrace (struct target_ops *self, ptid_t ptid) -{ - struct btrace_target_info *tinfo; - struct gdbarch *gdbarch; - - errno = 0; - tinfo = linux_enable_btrace (ptid); - - if (tinfo == NULL) - error (_("Could not enable branch tracing for %s: %s."), - target_pid_to_str (ptid), safe_strerror (errno)); - - /* Fill in the size of a pointer in bits. */ - gdbarch = target_thread_architecture (ptid); - tinfo->ptr_bits = gdbarch_ptr_bit (gdbarch); - - return tinfo; -} - -/* Disable branch tracing. */ - -static void -x86_linux_disable_btrace (struct target_ops *self, - struct btrace_target_info *tinfo) -{ - enum btrace_error errcode = linux_disable_btrace (tinfo); - - if (errcode != BTRACE_ERR_NONE) - error (_("Could not disable branch tracing.")); -} - -/* Teardown branch tracing. */ - -static void -x86_linux_teardown_btrace (struct target_ops *self, - struct btrace_target_info *tinfo) -{ - /* Ignore errors. */ - linux_disable_btrace (tinfo); -} - -static enum btrace_error -x86_linux_read_btrace (struct target_ops *self, - VEC (btrace_block_s) **data, - struct btrace_target_info *btinfo, - enum btrace_read_type type) -{ - return linux_read_btrace (data, btinfo, type); -} - -/* Create an x86 GNU/Linux target. */ - -static struct target_ops * -x86_linux_create_target (void) -{ - /* Fill in the generic GNU/Linux methods. */ - struct target_ops *t = linux_target (); - - /* Initialize the debug register function vectors. */ - i386_use_watchpoints (t); - i386_dr_low.set_control = x86_linux_dr_set_control; - i386_dr_low.set_addr = x86_linux_dr_set_addr; - i386_dr_low.get_addr = x86_linux_dr_get_addr; - i386_dr_low.get_status = x86_linux_dr_get_status; - i386_dr_low.get_control = x86_linux_dr_get_control; - i386_set_debug_register_length (sizeof (void *)); - - /* Override the GNU/Linux inferior startup hook. */ - super_post_startup_inferior = t->to_post_startup_inferior; - t->to_post_startup_inferior = x86_linux_child_post_startup_inferior; - - /* Add the description reader. */ - t->to_read_description = x86_linux_read_description; - - /* Add btrace methods. */ - t->to_supports_btrace = linux_supports_btrace; - t->to_enable_btrace = x86_linux_enable_btrace; - t->to_disable_btrace = x86_linux_disable_btrace; - t->to_teardown_btrace = x86_linux_teardown_btrace; - t->to_read_btrace = x86_linux_read_btrace; - - return t; -} - -/* Add an x86 GNU/Linux target. */ - -static void -x86_linux_add_target (struct target_ops *t) -{ - linux_nat_add_target (t); - linux_nat_set_new_thread (t, x86_linux_new_thread); - linux_nat_set_new_fork (t, x86_linux_new_fork); - linux_nat_set_forget_process (t, i386_forget_process); - linux_nat_set_prepare_to_resume (t, x86_linux_prepare_to_resume); -} + /* Provide a prototype to silence -Wmissing-prototypes. */ void _initialize_amd64_linux_nat (void); diff --git a/gdb/config/i386/linux.mh b/gdb/config/i386/linux.mh index be18dcf..536ed3d 100644 --- a/gdb/config/i386/linux.mh +++ b/gdb/config/i386/linux.mh @@ -2,7 +2,7 @@ NAT_FILE= config/nm-linux.h NATDEPFILES= inf-ptrace.o fork-child.o \ - i386-nat.o i386-dregs.o i386-linux-nat.o \ + i386-nat.o i386-dregs.o i386-linux-nat.o x86-linux-nat.o \ proc-service.o linux-thread-db.o \ linux-nat.o linux-osdata.o linux-fork.o linux-procfs.o linux-ptrace.o \ linux-btrace.o linux-waitpid.o diff --git a/gdb/config/i386/linux64.mh b/gdb/config/i386/linux64.mh index 3126b75..8faca42 100644 --- a/gdb/config/i386/linux64.mh +++ b/gdb/config/i386/linux64.mh @@ -1,6 +1,7 @@ # Host: GNU/Linux x86-64 NATDEPFILES= inf-ptrace.o fork-child.o \ i386-nat.o i386-dregs.o amd64-nat.o amd64-linux-nat.o \ + x86-linux-nat.o \ linux-nat.o linux-osdata.o \ proc-service.o linux-thread-db.o linux-fork.o \ linux-procfs.o linux-ptrace.o linux-btrace.o \ diff --git a/gdb/i386-linux-nat.c b/gdb/i386-linux-nat.c index 1ee7503..154cd12 100644 --- a/gdb/i386-linux-nat.c +++ b/gdb/i386-linux-nat.c @@ -60,25 +60,7 @@ #include "i386-xstate.h" -#ifndef PTRACE_GETREGSET -#define PTRACE_GETREGSET 0x4204 -#endif - -#ifndef PTRACE_SETREGSET -#define PTRACE_SETREGSET 0x4205 -#endif - -/* Per-thread arch-specific data we want to keep. */ - -struct arch_lwp_info -{ - /* Non-zero if our copy differs from what's recorded in the thread. */ - int debug_registers_changed; -}; - -/* Does the current host support PTRACE_GETREGSET? */ -static int have_ptrace_getregset = -1; - +#include "x86-linux-nat.h" /* The register sets used in GNU/Linux ELF core-dumps are identical to the register sets in `struct user' that is used for a.out @@ -642,262 +624,6 @@ i386_linux_store_inferior_registers (struct target_ops *ops, } -/* Support for debug registers. */ - -/* Get debug register REGNUM value from only the one LWP of PTID. */ - -static unsigned long -x86_linux_dr_get (ptid_t ptid, int regnum) -{ - int tid; - unsigned long value; - - tid = ptid_get_lwp (ptid); - if (tid == 0) - tid = ptid_get_pid (ptid); - - errno = 0; - value = ptrace (PTRACE_PEEKUSER, tid, - offsetof (struct user, u_debugreg[regnum]), 0); - if (errno != 0) - perror_with_name (_("Couldn't read debug register")); - - return value; -} - -/* Set debug register REGNUM to VALUE in only the one LWP of PTID. */ - -static void -x86_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) -{ - int tid; - - tid = ptid_get_lwp (ptid); - if (tid == 0) - tid = ptid_get_pid (ptid); - - errno = 0; - ptrace (PTRACE_POKEUSER, tid, - offsetof (struct user, u_debugreg[regnum]), value); - if (errno != 0) - perror_with_name (_("Couldn't write debug register")); -} - -/* Return the inferior's debug register REGNUM. */ - -static CORE_ADDR -x86_linux_dr_get_addr (int regnum) -{ - /* DR6 and DR7 are retrieved with some other way. */ - gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR); - - return x86_linux_dr_get (inferior_ptid, regnum); -} - -/* Return the inferior's DR7 debug control register. */ - -static unsigned long -x86_linux_dr_get_control (void) -{ - return x86_linux_dr_get (inferior_ptid, DR_CONTROL); -} - -/* Get DR_STATUS from only the one LWP of INFERIOR_PTID. */ - -static unsigned long -x86_linux_dr_get_status (void) -{ - return x86_linux_dr_get (inferior_ptid, DR_STATUS); -} - -/* Callback for iterate_over_lwps. Update the debug registers of - LWP. */ - -static int -update_debug_registers_callback (struct lwp_info *lwp, void *arg) -{ - if (lwp->arch_private == NULL) - lwp->arch_private = XCNEW (struct arch_lwp_info); - - /* The actual update is done later just before resuming the lwp, we - just mark that the registers need updating. */ - lwp->arch_private->debug_registers_changed = 1; - - /* If the lwp isn't stopped, force it to momentarily pause, so we - can update its debug registers. */ - if (!lwp->stopped) - linux_stop_lwp (lwp); - - /* Continue the iteration. */ - return 0; -} - -/* Set DR_CONTROL to CONTROL in all LWPs of the current inferior. */ - -static void -x86_linux_dr_set_control (unsigned long control) -{ - ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); - - iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL); -} - -/* Set address REGNUM (zero based) to ADDR in all LWPs of the current - inferior. */ - -static void -x86_linux_dr_set_addr (int regnum, CORE_ADDR addr) -{ - ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); - - gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); - - iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL); -} - -/* Called when resuming a thread. - If the debug regs have changed, update the thread's copies. */ - -static void -x86_linux_prepare_to_resume (struct lwp_info *lwp) -{ - int clear_status = 0; - - /* NULL means this is the main thread still going through the shell, - or, no watchpoint has been set yet. In that case, there's - nothing to do. */ - if (lwp->arch_private == NULL) - return; - - if (lwp->arch_private->debug_registers_changed) - { - struct i386_debug_reg_state *state - = i386_debug_reg_state (ptid_get_pid (lwp->ptid)); - int i; - - /* On Linux kernel before 2.6.33 commit - 72f674d203cd230426437cdcf7dd6f681dad8b0d - if you enable a breakpoint by the DR_CONTROL bits you need to have - already written the corresponding DR_FIRSTADDR...DR_LASTADDR registers. - - Ensure DR_CONTROL gets written as the very last register here. */ - - /* Clear DR_CONTROL first. In some cases, setting DR0-3 to a - value that doesn't match what is enabled in DR_CONTROL - results in EINVAL. */ - x86_linux_dr_set (lwp->ptid, DR_CONTROL, 0); - - for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) - if (state->dr_ref_count[i] > 0) - { - x86_linux_dr_set (lwp->ptid, i, state->dr_mirror[i]); - - /* If we're setting a watchpoint, any change the inferior - had done itself to the debug registers needs to be - discarded, otherwise, i386_stopped_data_address can get - confused. */ - clear_status = 1; - } - - /* If DR_CONTROL is supposed to be zero, we've already set it - above. */ - if (state->dr_control_mirror != 0) - x86_linux_dr_set (lwp->ptid, DR_CONTROL, state->dr_control_mirror); - - lwp->arch_private->debug_registers_changed = 0; - } - - if (clear_status || lwp->stopped_by_watchpoint) - x86_linux_dr_set (lwp->ptid, DR_STATUS, 0); -} - -static void -x86_linux_new_thread (struct lwp_info *lp) -{ - struct arch_lwp_info *info = XCNEW (struct arch_lwp_info); - - info->debug_registers_changed = 1; - - lp->arch_private = info; -} - -/* linux_nat_new_fork hook. */ - -static void -x86_linux_new_fork (struct lwp_info *parent, pid_t child_pid) -{ - pid_t parent_pid; - struct i386_debug_reg_state *parent_state; - struct i386_debug_reg_state *child_state; - - /* NULL means no watchpoint has ever been set in the parent. In - that case, there's nothing to do. */ - if (parent->arch_private == NULL) - return; - - /* Linux kernel before 2.6.33 commit - 72f674d203cd230426437cdcf7dd6f681dad8b0d - will inherit hardware debug registers from parent - on fork/vfork/clone. Newer Linux kernels create such tasks with - zeroed debug registers. - - GDB core assumes the child inherits the watchpoints/hw - breakpoints of the parent, and will remove them all from the - forked off process. Copy the debug registers mirrors into the - new process so that all breakpoints and watchpoints can be - removed together. The debug registers mirror will become zeroed - in the end before detaching the forked off process, thus making - this compatible with older Linux kernels too. */ - - parent_pid = ptid_get_pid (parent->ptid); - parent_state = i386_debug_reg_state (parent_pid); - child_state = i386_debug_reg_state (child_pid); - *child_state = *parent_state; -} - - - -/* Helper for ps_get_thread_area. Sets BASE_ADDR to a pointer to - the thread local storage (or its descriptor) and returns PS_OK - on success. Returns PS_ERR on failure. */ - -static ps_err_e -x86_linux_get_thread_area (pid_t pid, void *addr, unsigned int *base_addr) -{ - /* NOTE: cagney/2003-08-26: The definition of this buffer is found - in the kernel header . It, after padding, is 4 x - 4 byte integers in size: `entry_number', `base_addr', `limit', - and a bunch of status bits. - - The values returned by this ptrace call should be part of the - regcache buffer, and ps_get_thread_area should channel its - request through the regcache. That way remote targets could - provide the value using the remote protocol and not this direct - call. - - Is this function needed? I'm guessing that the `base' is the - address of a descriptor that libthread_db uses to find the - thread local address base that GDB needs. Perhaps that - descriptor is defined by the ABI. Anyway, given that - libthread_db calls this function without prompting (gdb - requesting tls base) I guess it needs info in there anyway. */ - unsigned int desc[4]; - - /* This code assumes that "int" is 32 bits and that - GET_THREAD_AREA returns no more than 4 int values. */ - gdb_assert (sizeof (int) == 4); - -#ifndef PTRACE_GET_THREAD_AREA -#define PTRACE_GET_THREAD_AREA 25 -#endif - - if (ptrace (PTRACE_GET_THREAD_AREA, pid, addr, &desc) < 0) - return PS_ERR; - - *base_addr = desc[1]; - return PS_OK; -} - /* Called by libthread_db. Returns a pointer to the thread local storage (or its descriptor). */ @@ -1013,264 +739,7 @@ i386_linux_resume (struct target_ops *ops, if (ptrace (request, pid, 0, gdb_signal_to_host (signal)) == -1) perror_with_name (("ptrace")); } - -static void (*super_post_startup_inferior) (struct target_ops *self, - ptid_t ptid); - -static void -x86_linux_child_post_startup_inferior (struct target_ops *self, ptid_t ptid) -{ - i386_cleanup_dregs (); - super_post_startup_inferior (self, ptid); -} - -#ifdef __x86_64__ -/* Value of CS segment register: - 64bit process: 0x33 - 32bit process: 0x23 */ -#define AMD64_LINUX_USER64_CS 0x33 - -/* Value of DS segment register: - LP64 process: 0x0 - X32 process: 0x2b */ -#define AMD64_LINUX_X32_DS 0x2b -#endif - -/* Get Linux/x86 target description from running target. */ - -static const struct target_desc * -x86_linux_read_description (struct target_ops *ops) -{ - int tid; - int is_64bit = 0; -#ifdef __x86_64__ - int is_x32; -#endif - static uint64_t xcr0; - uint64_t xcr0_features_bits; - - /* GNU/Linux LWP ID's are process ID's. */ - tid = ptid_get_lwp (inferior_ptid); - if (tid == 0) - tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ - -#ifdef __x86_64__ - { - unsigned long cs; - unsigned long ds; - - /* Get CS register. */ - errno = 0; - cs = ptrace (PTRACE_PEEKUSER, tid, - offsetof (struct user_regs_struct, cs), 0); - if (errno != 0) - perror_with_name (_("Couldn't get CS register")); - - is_64bit = cs == AMD64_LINUX_USER64_CS; - - /* Get DS register. */ - errno = 0; - ds = ptrace (PTRACE_PEEKUSER, tid, - offsetof (struct user_regs_struct, ds), 0); - if (errno != 0) - perror_with_name (_("Couldn't get DS register")); - - is_x32 = ds == AMD64_LINUX_X32_DS; - - if (sizeof (void *) == 4 && is_64bit && !is_x32) - error (_("Can't debug 64-bit process with 32-bit GDB")); - } -#elif HAVE_PTRACE_GETFPXREGS - if (have_ptrace_getfpxregs == -1) - { - elf_fpxregset_t fpxregs; - - if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) - { - have_ptrace_getfpxregs = 0; - have_ptrace_getregset = 0; - return tdesc_i386_mmx_linux; - } - } -#endif - - if (have_ptrace_getregset == -1) - { - uint64_t xstateregs[(I386_XSTATE_SSE_SIZE / sizeof (uint64_t))]; - struct iovec iov; - - iov.iov_base = xstateregs; - iov.iov_len = sizeof (xstateregs); - - /* Check if PTRACE_GETREGSET works. */ - if (ptrace (PTRACE_GETREGSET, tid, - (unsigned int) NT_X86_XSTATE, &iov) < 0) - have_ptrace_getregset = 0; - else - { - have_ptrace_getregset = 1; - - /* Get XCR0 from XSAVE extended state. */ - xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET - / sizeof (uint64_t))]; - } - } - - /* Check the native XCR0 only if PTRACE_GETREGSET is available. If - PTRACE_GETREGSET is not available then set xcr0_features_bits to - zero so that the "no-features" descriptions are returned by the - switches below. */ - if (have_ptrace_getregset) - xcr0_features_bits = xcr0 & I386_XSTATE_ALL_MASK; - else - xcr0_features_bits = 0; - - if (is_64bit) - { -#ifdef __x86_64__ - switch (xcr0_features_bits) - { - case I386_XSTATE_MPX_AVX512_MASK: - case I386_XSTATE_AVX512_MASK: - if (is_x32) - return tdesc_x32_avx512_linux; - else - return tdesc_amd64_avx512_linux; - case I386_XSTATE_MPX_MASK: - if (is_x32) - return tdesc_x32_avx_linux; /* No MPX on x32 using AVX. */ - else - return tdesc_amd64_mpx_linux; - case I386_XSTATE_AVX_MASK: - if (is_x32) - return tdesc_x32_avx_linux; - else - return tdesc_amd64_avx_linux; - default: - if (is_x32) - return tdesc_x32_linux; - else - return tdesc_amd64_linux; - } -#endif - } - else - { - switch (xcr0_features_bits) - { - case I386_XSTATE_MPX_AVX512_MASK: - case I386_XSTATE_AVX512_MASK: - return tdesc_i386_avx512_linux; - case I386_XSTATE_MPX_MASK: - return tdesc_i386_mpx_linux; - case I386_XSTATE_AVX_MASK: - return tdesc_i386_avx_linux; - default: - return tdesc_i386_linux; - } - } - - gdb_assert_not_reached ("failed to return tdesc"); -} - -/* Enable branch tracing. */ - -static struct btrace_target_info * -x86_linux_enable_btrace (struct target_ops *self, ptid_t ptid) -{ - struct btrace_target_info *tinfo; - struct gdbarch *gdbarch; - - errno = 0; - tinfo = linux_enable_btrace (ptid); - - if (tinfo == NULL) - error (_("Could not enable branch tracing for %s: %s."), - target_pid_to_str (ptid), safe_strerror (errno)); - - /* Fill in the size of a pointer in bits. */ - gdbarch = target_thread_architecture (ptid); - tinfo->ptr_bits = gdbarch_ptr_bit (gdbarch); - - return tinfo; -} - -/* Disable branch tracing. */ - -static void -x86_linux_disable_btrace (struct target_ops *self, - struct btrace_target_info *tinfo) -{ - enum btrace_error errcode = linux_disable_btrace (tinfo); - - if (errcode != BTRACE_ERR_NONE) - error (_("Could not disable branch tracing.")); -} - -/* Teardown branch tracing. */ - -static void -x86_linux_teardown_btrace (struct target_ops *self, - struct btrace_target_info *tinfo) -{ - /* Ignore errors. */ - linux_disable_btrace (tinfo); -} - -static enum btrace_error -x86_linux_read_btrace (struct target_ops *self, - VEC (btrace_block_s) **data, - struct btrace_target_info *btinfo, - enum btrace_read_type type) -{ - return linux_read_btrace (data, btinfo, type); -} - -/* Create an x86 GNU/Linux target. */ - -static struct target_ops * -x86_linux_create_target (void) -{ - /* Fill in the generic GNU/Linux methods. */ - struct target_ops *t = linux_target (); - - /* Initialize the debug register function vectors. */ - i386_use_watchpoints (t); - i386_dr_low.set_control = x86_linux_dr_set_control; - i386_dr_low.set_addr = x86_linux_dr_set_addr; - i386_dr_low.get_addr = x86_linux_dr_get_addr; - i386_dr_low.get_status = x86_linux_dr_get_status; - i386_dr_low.get_control = x86_linux_dr_get_control; - i386_set_debug_register_length (sizeof (void *)); - - /* Override the GNU/Linux inferior startup hook. */ - super_post_startup_inferior = t->to_post_startup_inferior; - t->to_post_startup_inferior = x86_linux_child_post_startup_inferior; - - /* Add the description reader. */ - t->to_read_description = x86_linux_read_description; - - /* Add btrace methods. */ - t->to_supports_btrace = linux_supports_btrace; - t->to_enable_btrace = x86_linux_enable_btrace; - t->to_disable_btrace = x86_linux_disable_btrace; - t->to_teardown_btrace = x86_linux_teardown_btrace; - t->to_read_btrace = x86_linux_read_btrace; - - return t; -} - -/* Add an x86 GNU/Linux target. */ - -static void -x86_linux_add_target (struct target_ops *t) -{ - linux_nat_add_target (t); - linux_nat_set_new_thread (t, x86_linux_new_thread); - linux_nat_set_new_fork (t, x86_linux_new_fork); - linux_nat_set_forget_process (t, i386_forget_process); - linux_nat_set_prepare_to_resume (t, x86_linux_prepare_to_resume); -} + /* -Wmissing-prototypes */ extern initialize_file_ftype _initialize_i386_linux_nat; diff --git a/gdb/i386-linux-nat.h b/gdb/i386-linux-nat.h new file mode 100644 index 0000000..f2c29bd --- /dev/null +++ b/gdb/i386-linux-nat.h @@ -0,0 +1,26 @@ +/* Native-dependent code for GNU/Linux i386. + + Copyright (C) 1999-2014 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#ifndef I386_LINUX_NAT_H +#define I386_LINUX_NAT_H 1 + +/* Does the current host support the GETFPXREGS request? */ +extern int have_ptrace_getfpxregs; + +#endif diff --git a/gdb/x86-linux-nat.c b/gdb/x86-linux-nat.c new file mode 100644 index 0000000..7527370 --- /dev/null +++ b/gdb/x86-linux-nat.c @@ -0,0 +1,568 @@ +/* Native-dependent code for GNU/Linux x86 (i386 and x86-64). + + Copyright (C) 1999-2014 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#include "defs.h" +#include "inferior.h" +#include "elf/common.h" +#include "gdb_proc_service.h" +#include +#include +#include + +#include "i386-nat.h" +#include "linux-nat.h" +#ifndef __x86_64__ +#include "i386-linux-nat.h" +#endif +#include "x86-linux-nat.h" +#include "i386-linux-tdep.h" +#ifdef __x86_64__ +#include "amd64-linux-tdep.h" +#endif +#include "i386-xstate.h" +#include "nat/linux-btrace.h" + +/* Per-thread arch-specific data we want to keep. */ + +struct arch_lwp_info +{ + /* Non-zero if our copy differs from what's recorded in the thread. */ + int debug_registers_changed; +}; + +/* Does the current host support PTRACE_GETREGSET? */ +int have_ptrace_getregset = -1; + + +/* Support for debug registers. */ + +/* Get debug register REGNUM value from only the one LWP of PTID. */ + +static unsigned long +x86_linux_dr_get (ptid_t ptid, int regnum) +{ + int tid; + unsigned long value; + + tid = ptid_get_lwp (ptid); + if (tid == 0) + tid = ptid_get_pid (ptid); + + errno = 0; + value = ptrace (PTRACE_PEEKUSER, tid, + offsetof (struct user, u_debugreg[regnum]), 0); + if (errno != 0) + perror_with_name (_("Couldn't read debug register")); + + return value; +} + +/* Set debug register REGNUM to VALUE in only the one LWP of PTID. */ + +static void +x86_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) +{ + int tid; + + tid = ptid_get_lwp (ptid); + if (tid == 0) + tid = ptid_get_pid (ptid); + + errno = 0; + ptrace (PTRACE_POKEUSER, tid, + offsetof (struct user, u_debugreg[regnum]), value); + if (errno != 0) + perror_with_name (_("Couldn't write debug register")); +} + +/* Return the inferior's debug register REGNUM. */ + +static CORE_ADDR +x86_linux_dr_get_addr (int regnum) +{ + /* DR6 and DR7 are retrieved with some other way. */ + gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR); + + return x86_linux_dr_get (inferior_ptid, regnum); +} + +/* Return the inferior's DR7 debug control register. */ + +static unsigned long +x86_linux_dr_get_control (void) +{ + return x86_linux_dr_get (inferior_ptid, DR_CONTROL); +} + +/* Get DR_STATUS from only the one LWP of INFERIOR_PTID. */ + +static unsigned long +x86_linux_dr_get_status (void) +{ + return x86_linux_dr_get (inferior_ptid, DR_STATUS); +} + +/* Callback for iterate_over_lwps. Update the debug registers of + LWP. */ + +static int +update_debug_registers_callback (struct lwp_info *lwp, void *arg) +{ + if (lwp->arch_private == NULL) + lwp->arch_private = XCNEW (struct arch_lwp_info); + + /* The actual update is done later just before resuming the lwp, we + just mark that the registers need updating. */ + lwp->arch_private->debug_registers_changed = 1; + + /* If the lwp isn't stopped, force it to momentarily pause, so we + can update its debug registers. */ + if (!lwp->stopped) + linux_stop_lwp (lwp); + + /* Continue the iteration. */ + return 0; +} + +/* Set DR_CONTROL to CONTROL in all LWPs of the current inferior. */ + +static void +x86_linux_dr_set_control (unsigned long control) +{ + ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); + + iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL); +} + +/* Set address REGNUM (zero based) to ADDR in all LWPs of the current + inferior. */ + +static void +x86_linux_dr_set_addr (int regnum, CORE_ADDR addr) +{ + ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); + + gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); + + iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL); +} + +/* Called when resuming a thread. + If the debug regs have changed, update the thread's copies. */ + +static void +x86_linux_prepare_to_resume (struct lwp_info *lwp) +{ + int clear_status = 0; + + /* NULL means this is the main thread still going through the shell, + or, no watchpoint has been set yet. In that case, there's + nothing to do. */ + if (lwp->arch_private == NULL) + return; + + if (lwp->arch_private->debug_registers_changed) + { + struct i386_debug_reg_state *state + = i386_debug_reg_state (ptid_get_pid (lwp->ptid)); + int i; + + /* On Linux kernel before 2.6.33 commit + 72f674d203cd230426437cdcf7dd6f681dad8b0d + if you enable a breakpoint by the DR_CONTROL bits you need to have + already written the corresponding DR_FIRSTADDR...DR_LASTADDR registers. + + Ensure DR_CONTROL gets written as the very last register here. */ + + /* Clear DR_CONTROL first. In some cases, setting DR0-3 to a + value that doesn't match what is enabled in DR_CONTROL + results in EINVAL. */ + x86_linux_dr_set (lwp->ptid, DR_CONTROL, 0); + + for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++) + if (state->dr_ref_count[i] > 0) + { + x86_linux_dr_set (lwp->ptid, i, state->dr_mirror[i]); + + /* If we're setting a watchpoint, any change the inferior + had done itself to the debug registers needs to be + discarded, otherwise, i386_stopped_data_address can get + confused. */ + clear_status = 1; + } + + /* If DR_CONTROL is supposed to be zero, we've already set it + above. */ + if (state->dr_control_mirror != 0) + x86_linux_dr_set (lwp->ptid, DR_CONTROL, state->dr_control_mirror); + + lwp->arch_private->debug_registers_changed = 0; + } + + if (clear_status || lwp->stopped_by_watchpoint) + x86_linux_dr_set (lwp->ptid, DR_STATUS, 0); +} + +static void +x86_linux_new_thread (struct lwp_info *lp) +{ + struct arch_lwp_info *info = XCNEW (struct arch_lwp_info); + + info->debug_registers_changed = 1; + + lp->arch_private = info; +} + + +/* linux_nat_new_fork hook. */ + +static void +x86_linux_new_fork (struct lwp_info *parent, pid_t child_pid) +{ + pid_t parent_pid; + struct i386_debug_reg_state *parent_state; + struct i386_debug_reg_state *child_state; + + /* NULL means no watchpoint has ever been set in the parent. In + that case, there's nothing to do. */ + if (parent->arch_private == NULL) + return; + + /* Linux kernel before 2.6.33 commit + 72f674d203cd230426437cdcf7dd6f681dad8b0d + will inherit hardware debug registers from parent + on fork/vfork/clone. Newer Linux kernels create such tasks with + zeroed debug registers. + + GDB core assumes the child inherits the watchpoints/hw + breakpoints of the parent, and will remove them all from the + forked off process. Copy the debug registers mirrors into the + new process so that all breakpoints and watchpoints can be + removed together. The debug registers mirror will become zeroed + in the end before detaching the forked off process, thus making + this compatible with older Linux kernels too. */ + + parent_pid = ptid_get_pid (parent->ptid); + parent_state = i386_debug_reg_state (parent_pid); + child_state = i386_debug_reg_state (child_pid); + *child_state = *parent_state; +} + + +static void (*super_post_startup_inferior) (struct target_ops *self, + ptid_t ptid); + +static void +x86_linux_child_post_startup_inferior (struct target_ops *self, ptid_t ptid) +{ + i386_cleanup_dregs (); + super_post_startup_inferior (self, ptid); +} + +#ifdef __x86_64__ +/* Value of CS segment register: + 64bit process: 0x33 + 32bit process: 0x23 */ +#define AMD64_LINUX_USER64_CS 0x33 + +/* Value of DS segment register: + LP64 process: 0x0 + X32 process: 0x2b */ +#define AMD64_LINUX_X32_DS 0x2b +#endif + +/* Get Linux/x86 target description from running target. */ + +static const struct target_desc * +x86_linux_read_description (struct target_ops *ops) +{ + int tid; + int is_64bit = 0; +#ifdef __x86_64__ + int is_x32; +#endif + static uint64_t xcr0; + uint64_t xcr0_features_bits; + + /* GNU/Linux LWP ID's are process ID's. */ + tid = ptid_get_lwp (inferior_ptid); + if (tid == 0) + tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ + +#ifdef __x86_64__ + { + unsigned long cs; + unsigned long ds; + + /* Get CS register. */ + errno = 0; + cs = ptrace (PTRACE_PEEKUSER, tid, + offsetof (struct user_regs_struct, cs), 0); + if (errno != 0) + perror_with_name (_("Couldn't get CS register")); + + is_64bit = cs == AMD64_LINUX_USER64_CS; + + /* Get DS register. */ + errno = 0; + ds = ptrace (PTRACE_PEEKUSER, tid, + offsetof (struct user_regs_struct, ds), 0); + if (errno != 0) + perror_with_name (_("Couldn't get DS register")); + + is_x32 = ds == AMD64_LINUX_X32_DS; + + if (sizeof (void *) == 4 && is_64bit && !is_x32) + error (_("Can't debug 64-bit process with 32-bit GDB")); + } +#elif HAVE_PTRACE_GETFPXREGS + if (have_ptrace_getfpxregs == -1) + { + elf_fpxregset_t fpxregs; + + if (ptrace (PTRACE_GETFPXREGS, tid, 0, (int) &fpxregs) < 0) + { + have_ptrace_getfpxregs = 0; + have_ptrace_getregset = 0; + return tdesc_i386_mmx_linux; + } + } +#endif + + if (have_ptrace_getregset == -1) + { + uint64_t xstateregs[(I386_XSTATE_SSE_SIZE / sizeof (uint64_t))]; + struct iovec iov; + + iov.iov_base = xstateregs; + iov.iov_len = sizeof (xstateregs); + + /* Check if PTRACE_GETREGSET works. */ + if (ptrace (PTRACE_GETREGSET, tid, + (unsigned int) NT_X86_XSTATE, &iov) < 0) + have_ptrace_getregset = 0; + else + { + have_ptrace_getregset = 1; + + /* Get XCR0 from XSAVE extended state. */ + xcr0 = xstateregs[(I386_LINUX_XSAVE_XCR0_OFFSET + / sizeof (uint64_t))]; + } + } + + /* Check the native XCR0 only if PTRACE_GETREGSET is available. If + PTRACE_GETREGSET is not available then set xcr0_features_bits to + zero so that the "no-features" descriptions are returned by the + switches below. */ + if (have_ptrace_getregset) + xcr0_features_bits = xcr0 & I386_XSTATE_ALL_MASK; + else + xcr0_features_bits = 0; + + if (is_64bit) + { +#ifdef __x86_64__ + switch (xcr0_features_bits) + { + case I386_XSTATE_MPX_AVX512_MASK: + case I386_XSTATE_AVX512_MASK: + if (is_x32) + return tdesc_x32_avx512_linux; + else + return tdesc_amd64_avx512_linux; + case I386_XSTATE_MPX_MASK: + if (is_x32) + return tdesc_x32_avx_linux; /* No MPX on x32 using AVX. */ + else + return tdesc_amd64_mpx_linux; + case I386_XSTATE_AVX_MASK: + if (is_x32) + return tdesc_x32_avx_linux; + else + return tdesc_amd64_avx_linux; + default: + if (is_x32) + return tdesc_x32_linux; + else + return tdesc_amd64_linux; + } +#endif + } + else + { + switch (xcr0_features_bits) + { + case I386_XSTATE_MPX_AVX512_MASK: + case I386_XSTATE_AVX512_MASK: + return tdesc_i386_avx512_linux; + case I386_XSTATE_MPX_MASK: + return tdesc_i386_mpx_linux; + case I386_XSTATE_AVX_MASK: + return tdesc_i386_avx_linux; + default: + return tdesc_i386_linux; + } + } + + gdb_assert_not_reached ("failed to return tdesc"); +} + + +/* Enable branch tracing. */ + +static struct btrace_target_info * +x86_linux_enable_btrace (struct target_ops *self, ptid_t ptid) +{ + struct btrace_target_info *tinfo; + struct gdbarch *gdbarch; + + errno = 0; + tinfo = linux_enable_btrace (ptid); + + if (tinfo == NULL) + error (_("Could not enable branch tracing for %s: %s."), + target_pid_to_str (ptid), safe_strerror (errno)); + + /* Fill in the size of a pointer in bits. */ + gdbarch = target_thread_architecture (ptid); + tinfo->ptr_bits = gdbarch_ptr_bit (gdbarch); + + return tinfo; +} + +/* Disable branch tracing. */ + +static void +x86_linux_disable_btrace (struct target_ops *self, + struct btrace_target_info *tinfo) +{ + enum btrace_error errcode = linux_disable_btrace (tinfo); + + if (errcode != BTRACE_ERR_NONE) + error (_("Could not disable branch tracing.")); +} + +/* Teardown branch tracing. */ + +static void +x86_linux_teardown_btrace (struct target_ops *self, + struct btrace_target_info *tinfo) +{ + /* Ignore errors. */ + linux_disable_btrace (tinfo); +} + +static enum btrace_error +x86_linux_read_btrace (struct target_ops *self, + VEC (btrace_block_s) **data, + struct btrace_target_info *btinfo, + enum btrace_read_type type) +{ + return linux_read_btrace (data, btinfo, type); +} + + +/* Helper for ps_get_thread_area. Sets BASE_ADDR to a pointer to + the thread local storage (or its descriptor) and returns PS_OK + on success. Returns PS_ERR on failure. */ + +ps_err_e +x86_linux_get_thread_area (pid_t pid, void *addr, unsigned int *base_addr) +{ + /* NOTE: cagney/2003-08-26: The definition of this buffer is found + in the kernel header . It, after padding, is 4 x + 4 byte integers in size: `entry_number', `base_addr', `limit', + and a bunch of status bits. + + The values returned by this ptrace call should be part of the + regcache buffer, and ps_get_thread_area should channel its + request through the regcache. That way remote targets could + provide the value using the remote protocol and not this direct + call. + + Is this function needed? I'm guessing that the `base' is the + address of a descriptor that libthread_db uses to find the + thread local address base that GDB needs. Perhaps that + descriptor is defined by the ABI. Anyway, given that + libthread_db calls this function without prompting (gdb + requesting tls base) I guess it needs info in there anyway. */ + unsigned int desc[4]; + + /* This code assumes that "int" is 32 bits and that + GET_THREAD_AREA returns no more than 4 int values. */ + gdb_assert (sizeof (int) == 4); + +#ifndef PTRACE_GET_THREAD_AREA +#define PTRACE_GET_THREAD_AREA 25 +#endif + + if (ptrace (PTRACE_GET_THREAD_AREA, pid, addr, &desc) < 0) + return PS_ERR; + + *base_addr = desc[1]; + return PS_OK; +} + + +/* Create an x86 GNU/Linux target. */ + +struct target_ops * +x86_linux_create_target (void) +{ + /* Fill in the generic GNU/Linux methods. */ + struct target_ops *t = linux_target (); + + /* Initialize the debug register function vectors. */ + i386_use_watchpoints (t); + i386_dr_low.set_control = x86_linux_dr_set_control; + i386_dr_low.set_addr = x86_linux_dr_set_addr; + i386_dr_low.get_addr = x86_linux_dr_get_addr; + i386_dr_low.get_status = x86_linux_dr_get_status; + i386_dr_low.get_control = x86_linux_dr_get_control; + i386_set_debug_register_length (sizeof (void *)); + + /* Override the GNU/Linux inferior startup hook. */ + super_post_startup_inferior = t->to_post_startup_inferior; + t->to_post_startup_inferior = x86_linux_child_post_startup_inferior; + + /* Add the description reader. */ + t->to_read_description = x86_linux_read_description; + + /* Add btrace methods. */ + t->to_supports_btrace = linux_supports_btrace; + t->to_enable_btrace = x86_linux_enable_btrace; + t->to_disable_btrace = x86_linux_disable_btrace; + t->to_teardown_btrace = x86_linux_teardown_btrace; + t->to_read_btrace = x86_linux_read_btrace; + + return t; +} + +/* Add an x86 GNU/Linux target. */ + +void +x86_linux_add_target (struct target_ops *t) +{ + linux_nat_add_target (t); + linux_nat_set_new_thread (t, x86_linux_new_thread); + linux_nat_set_new_fork (t, x86_linux_new_fork); + linux_nat_set_forget_process (t, i386_forget_process); + linux_nat_set_prepare_to_resume (t, x86_linux_prepare_to_resume); +} diff --git a/gdb/x86-linux-nat.h b/gdb/x86-linux-nat.h new file mode 100644 index 0000000..16679af --- /dev/null +++ b/gdb/x86-linux-nat.h @@ -0,0 +1,51 @@ +/* Native-dependent code for GNU/Linux x86 (i386 and x86-64). + + Copyright (C) 1999-2014 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +#ifndef X86_LINUX_NAT_H +#define X86_LINUX_NAT_H 1 + +#ifndef PTRACE_GETREGSET +#define PTRACE_GETREGSET 0x4204 +#endif + +#ifndef PTRACE_SETREGSET +#define PTRACE_SETREGSET 0x4205 +#endif + +/* Does the current host support PTRACE_GETREGSET? */ +extern int have_ptrace_getregset; + + +/* Helper for ps_get_thread_area. Sets BASE_ADDR to a pointer to + the thread local storage (or its descriptor) and returns PS_OK + on success. Returns PS_ERR on failure. */ + +extern ps_err_e x86_linux_get_thread_area (pid_t pid, void *addr, + unsigned int *base_addr); + + +/* Create an x86 GNU/Linux target. */ + +extern struct target_ops *x86_linux_create_target (void); + +/* Add an x86 GNU/Linux target. */ + +extern void x86_linux_add_target (struct target_ops *t); + +#endif -- cgit v1.1