Date: Sun, 7 Feb 2010 11:37:38 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r203608 - in stable/8/sys: amd64/amd64 amd64/ia32 i386/i386 kern sys Message-ID: <201002071137.o17BbcxP008531@svn.freebsd.org>
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Author: kib Date: Sun Feb 7 11:37:38 2010 New Revision: 203608 URL: http://svn.freebsd.org/changeset/base/203608 Log: MFC r202882: For i386, amd64 and ia32 on amd64 MD syscall(), reread syscall number and arguments after ptracestop(), if debugger modified anything in the process environment. Modified: stable/8/sys/amd64/amd64/trap.c stable/8/sys/amd64/ia32/ia32_syscall.c stable/8/sys/i386/i386/trap.c stable/8/sys/kern/sys_process.c stable/8/sys/sys/proc.h Directory Properties: stable/8/sys/ (props changed) stable/8/sys/amd64/include/xen/ (props changed) stable/8/sys/cddl/contrib/opensolaris/ (props changed) stable/8/sys/contrib/dev/acpica/ (props changed) stable/8/sys/contrib/pf/ (props changed) stable/8/sys/dev/xen/xenpci/ (props changed) Modified: stable/8/sys/amd64/amd64/trap.c ============================================================================== --- stable/8/sys/amd64/amd64/trap.c Sun Feb 7 10:51:17 2010 (r203607) +++ stable/8/sys/amd64/amd64/trap.c Sun Feb 7 11:37:38 2010 (r203608) @@ -884,95 +884,131 @@ dblfault_handler(struct trapframe *frame panic("double fault"); } -/* - * syscall - system call request C handler - * - * A system call is essentially treated as a trap. - */ -void -syscall(struct trapframe *frame) -{ - caddr_t params; +struct syscall_args { + u_int code; struct sysent *callp; - struct thread *td = curthread; - struct proc *p = td->td_proc; - register_t orig_tf_rflags; - int error; - int narg; register_t args[8]; register_t *argp; - u_int code; - int reg, regcnt; - ksiginfo_t ksi; - - PCPU_INC(cnt.v_syscall); + int narg; +}; -#ifdef DIAGNOSTIC - if (ISPL(frame->tf_cs) != SEL_UPL) { - panic("syscall"); - /* NOT REACHED */ - } -#endif +static int +fetch_syscall_args(struct thread *td, struct syscall_args *sa) +{ + struct proc *p; + struct trapframe *frame; + caddr_t params; + int reg, regcnt, error; + p = td->td_proc; + frame = td->td_frame; reg = 0; regcnt = 6; - td->td_pticks = 0; - td->td_frame = frame; - if (td->td_ucred != p->p_ucred) - cred_update_thread(td); + params = (caddr_t)frame->tf_rsp + sizeof(register_t); - code = frame->tf_rax; - orig_tf_rflags = frame->tf_rflags; + sa->code = frame->tf_rax; if (p->p_sysent->sv_prepsyscall) { - (*p->p_sysent->sv_prepsyscall)(frame, (int *)args, &code, ¶ms); + (*p->p_sysent->sv_prepsyscall)(frame, (int *)sa->args, + &sa->code, ¶ms); } else { - if (code == SYS_syscall || code == SYS___syscall) { - code = frame->tf_rdi; + if (sa->code == SYS_syscall || sa->code == SYS___syscall) { + sa->code = frame->tf_rdi; reg++; regcnt--; } } - if (p->p_sysent->sv_mask) - code &= p->p_sysent->sv_mask; + sa->code &= p->p_sysent->sv_mask; - if (code >= p->p_sysent->sv_size) - callp = &p->p_sysent->sv_table[0]; + if (sa->code >= p->p_sysent->sv_size) + sa->callp = &p->p_sysent->sv_table[0]; else - callp = &p->p_sysent->sv_table[code]; + sa->callp = &p->p_sysent->sv_table[sa->code]; - narg = callp->sy_narg; - KASSERT(narg <= sizeof(args) / sizeof(args[0]), + sa->narg = sa->callp->sy_narg; + KASSERT(sa->narg <= sizeof(sa->args) / sizeof(sa->args[0]), ("Too many syscall arguments!")); error = 0; - argp = &frame->tf_rdi; - argp += reg; - bcopy(argp, args, sizeof(args[0]) * regcnt); - if (narg > regcnt) { + sa->argp = &frame->tf_rdi; + sa->argp += reg; + bcopy(sa->argp, sa->args, sizeof(sa->args[0]) * regcnt); + if (sa->narg > regcnt) { KASSERT(params != NULL, ("copyin args with no params!")); - error = copyin(params, &args[regcnt], - (narg - regcnt) * sizeof(args[0])); + error = copyin(params, &sa->args[regcnt], + (sa->narg - regcnt) * sizeof(sa->args[0])); } - argp = &args[0]; + sa->argp = &sa->args[0]; + /* + * This may result in two records if debugger modified + * registers or memory during sleep at stop/ptrace point. + */ #ifdef KTRACE if (KTRPOINT(td, KTR_SYSCALL)) - ktrsyscall(code, narg, argp); + ktrsyscall(sa->code, sa->narg, sa->argp); #endif + return (error); +} - CTR4(KTR_SYSC, "syscall enter thread %p pid %d proc %s code %d", td, - td->td_proc->p_pid, td->td_name, code); +/* + * syscall - system call request C handler + * + * A system call is essentially treated as a trap. + */ +void +syscall(struct trapframe *frame) +{ + struct thread *td; + struct proc *p; + struct syscall_args sa; + register_t orig_tf_rflags; + int error; + ksiginfo_t ksi; + PCPU_INC(cnt.v_syscall); + td = curthread; + p = td->td_proc; td->td_syscalls++; +#ifdef DIAGNOSTIC + if (ISPL(frame->tf_cs) != SEL_UPL) { + panic("syscall"); + /* NOT REACHED */ + } +#endif + + td->td_pticks = 0; + td->td_frame = frame; + if (td->td_ucred != p->p_ucred) + cred_update_thread(td); + orig_tf_rflags = frame->tf_rflags; + if (p->p_flag & P_TRACED) { + PROC_LOCK(p); + td->td_dbgflags &= ~TDB_USERWR; + PROC_UNLOCK(p); + } + error = fetch_syscall_args(td, &sa); + + CTR4(KTR_SYSC, "syscall enter thread %p pid %d proc %s code %d", td, + td->td_proc->p_pid, td->td_name, sa.code); + if (error == 0) { td->td_retval[0] = 0; td->td_retval[1] = frame->tf_rdx; - STOPEVENT(p, S_SCE, narg); - + STOPEVENT(p, S_SCE, sa.narg); PTRACESTOP_SC(p, td, S_PT_SCE); + if (td->td_dbgflags & TDB_USERWR) { + /* + * Reread syscall number and arguments if + * debugger modified registers or memory. + */ + error = fetch_syscall_args(td, &sa); + if (error != 0) + goto retval; + td->td_retval[1] = frame->tf_rdx; + } #ifdef KDTRACE_HOOKS /* @@ -980,13 +1016,13 @@ syscall(struct trapframe *frame) * callback and if there is a probe active for the * syscall 'entry', process the probe. */ - if (systrace_probe_func != NULL && callp->sy_entry != 0) - (*systrace_probe_func)(callp->sy_entry, code, callp, - args); + if (systrace_probe_func != NULL && sa.callp->sy_entry != 0) + (*systrace_probe_func)(sa.callp->sy_entry, sa.code, + sa.callp, sa.args); #endif - AUDIT_SYSCALL_ENTER(code, td); - error = (*callp->sy_call)(td, argp); + AUDIT_SYSCALL_ENTER(sa.code, td); + error = (*sa.callp->sy_call)(td, sa.argp); AUDIT_SYSCALL_EXIT(error, td); /* Save the latest error return value. */ @@ -998,12 +1034,12 @@ syscall(struct trapframe *frame) * callback and if there is a probe active for the * syscall 'return', process the probe. */ - if (systrace_probe_func != NULL && callp->sy_return != 0) - (*systrace_probe_func)(callp->sy_return, code, callp, - args); + if (systrace_probe_func != NULL && sa.callp->sy_return != 0) + (*systrace_probe_func)(sa.callp->sy_return, sa.code, + sa.callp, sa.args); #endif } - + retval: cpu_set_syscall_retval(td, error); /* @@ -1022,14 +1058,16 @@ syscall(struct trapframe *frame) * Check for misbehavior. */ WITNESS_WARN(WARN_PANIC, NULL, "System call %s returning", - (code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???"); + (sa.code >= 0 && sa.code < SYS_MAXSYSCALL) ? + syscallnames[sa.code] : "???"); KASSERT(td->td_critnest == 0, ("System call %s returning in a critical section", - (code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???")); + (sa.code >= 0 && sa.code < SYS_MAXSYSCALL) ? + syscallnames[sa.code] : "???")); KASSERT(td->td_locks == 0, ("System call %s returning with %d locks held", - (code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???", - td->td_locks)); + (sa.code >= 0 && sa.code < SYS_MAXSYSCALL) ? + syscallnames[sa.code] : "???", td->td_locks)); /* * Handle reschedule and other end-of-syscall issues @@ -1037,11 +1075,11 @@ syscall(struct trapframe *frame) userret(td, frame); CTR4(KTR_SYSC, "syscall exit thread %p pid %d proc %s code %d", td, - td->td_proc->p_pid, td->td_name, code); + td->td_proc->p_pid, td->td_name, sa.code); #ifdef KTRACE if (KTRPOINT(td, KTR_SYSRET)) - ktrsysret(code, error, td->td_retval[0]); + ktrsysret(sa.code, error, td->td_retval[0]); #endif /* @@ -1049,7 +1087,7 @@ syscall(struct trapframe *frame) * register set. If we ever support an emulation where this * is not the case, this code will need to be revisited. */ - STOPEVENT(p, S_SCX, code); + STOPEVENT(p, S_SCX, sa.code); PTRACESTOP_SC(p, td, S_PT_SCX); } Modified: stable/8/sys/amd64/ia32/ia32_syscall.c ============================================================================== --- stable/8/sys/amd64/ia32/ia32_syscall.c Sun Feb 7 10:51:17 2010 (r203607) +++ stable/8/sys/amd64/ia32/ia32_syscall.c Sun Feb 7 11:37:38 2010 (r203608) @@ -88,101 +88,136 @@ extern const char *freebsd32_syscallname void ia32_syscall(struct trapframe *frame); /* Called from asm code */ -void -ia32_syscall(struct trapframe *frame) -{ +struct ia32_syscall_args { + u_int code; caddr_t params; - int i; struct sysent *callp; - struct thread *td = curthread; - struct proc *p = td->td_proc; - register_t orig_tf_rflags; - int error; + u_int64_t args64[8]; int narg; +}; + +static int +fetch_ia32_syscall_args(struct thread *td, struct ia32_syscall_args *sa) +{ + struct proc *p; + struct trapframe *frame; u_int32_t args[8]; - u_int64_t args64[8]; - u_int code; - ksiginfo_t ksi; + int error, i; - PCPU_INC(cnt.v_syscall); - td->td_pticks = 0; - td->td_frame = frame; - if (td->td_ucred != p->p_ucred) - cred_update_thread(td); - params = (caddr_t)frame->tf_rsp + sizeof(u_int32_t); - code = frame->tf_rax; - orig_tf_rflags = frame->tf_rflags; + p = td->td_proc; + frame = td->td_frame; + + sa->params = (caddr_t)frame->tf_rsp + sizeof(u_int32_t); + sa->code = frame->tf_rax; if (p->p_sysent->sv_prepsyscall) { /* * The prep code is MP aware. */ - (*p->p_sysent->sv_prepsyscall)(frame, args, &code, ¶ms); + (*p->p_sysent->sv_prepsyscall)(frame, args, &sa->code, + &sa->params); } else { /* * Need to check if this is a 32 bit or 64 bit syscall. * fuword is MP aware. */ - if (code == SYS_syscall) { + if (sa->code == SYS_syscall) { /* * Code is first argument, followed by actual args. */ - code = fuword32(params); - params += sizeof(int); - } else if (code == SYS___syscall) { + sa->code = fuword32(sa->params); + sa->params += sizeof(int); + } else if (sa->code == SYS___syscall) { /* * Like syscall, but code is a quad, so as to maintain * quad alignment for the rest of the arguments. * We use a 32-bit fetch in case params is not * aligned. */ - code = fuword32(params); - params += sizeof(quad_t); + sa->code = fuword32(sa->params); + sa->params += sizeof(quad_t); } } - if (p->p_sysent->sv_mask) - code &= p->p_sysent->sv_mask; - - if (code >= p->p_sysent->sv_size) - callp = &p->p_sysent->sv_table[0]; + sa->code &= p->p_sysent->sv_mask; + if (sa->code >= p->p_sysent->sv_size) + sa->callp = &p->p_sysent->sv_table[0]; else - callp = &p->p_sysent->sv_table[code]; - - narg = callp->sy_narg; + sa->callp = &p->p_sysent->sv_table[sa->code]; + sa->narg = sa->callp->sy_narg; - /* - * copyin and the ktrsyscall()/ktrsysret() code is MP-aware - */ - if (params != NULL && narg != 0) - error = copyin(params, (caddr_t)args, - (u_int)(narg * sizeof(int))); + if (sa->params != NULL && sa->narg != 0) + error = copyin(sa->params, (caddr_t)args, + (u_int)(sa->narg * sizeof(int))); else error = 0; - for (i = 0; i < narg; i++) - args64[i] = args[i]; + for (i = 0; i < sa->narg; i++) + sa->args64[i] = args[i]; #ifdef KTRACE if (KTRPOINT(td, KTR_SYSCALL)) - ktrsyscall(code, narg, args64); + ktrsyscall(sa->code, sa->narg, sa->args64); #endif + + return (error); +} + +void +ia32_syscall(struct trapframe *frame) +{ + struct thread *td; + struct proc *p; + struct ia32_syscall_args sa; + register_t orig_tf_rflags; + int error; + ksiginfo_t ksi; + + PCPU_INC(cnt.v_syscall); + td = curthread; + p = td->td_proc; + td->td_syscalls++; + + td->td_pticks = 0; + td->td_frame = frame; + if (td->td_ucred != p->p_ucred) + cred_update_thread(td); + orig_tf_rflags = frame->tf_rflags; + if (p->p_flag & P_TRACED) { + PROC_LOCK(p); + td->td_dbgflags &= ~TDB_USERWR; + PROC_UNLOCK(p); + } + error = fetch_ia32_syscall_args(td, &sa); + CTR4(KTR_SYSC, "syscall enter thread %p pid %d proc %s code %d", td, - td->td_proc->p_pid, td->td_proc->p_comm, code); + td->td_proc->p_pid, td->td_name, sa.code); if (error == 0) { td->td_retval[0] = 0; td->td_retval[1] = frame->tf_rdx; - STOPEVENT(p, S_SCE, narg); - + STOPEVENT(p, S_SCE, sa.narg); PTRACESTOP_SC(p, td, S_PT_SCE); + if (td->td_dbgflags & TDB_USERWR) { + /* + * Reread syscall number and arguments if + * debugger modified registers or memory. + */ + error = fetch_ia32_syscall_args(td, &sa); + if (error != 0) + goto retval; + td->td_retval[1] = frame->tf_rdx; + } - AUDIT_SYSCALL_ENTER(code, td); - error = (*callp->sy_call)(td, args64); + AUDIT_SYSCALL_ENTER(sa.code, td); + error = (*sa.callp->sy_call)(td, sa.args64); AUDIT_SYSCALL_EXIT(error, td); - } + /* Save the latest error return value. */ + td->td_errno = error; + } + retval: cpu_set_syscall_retval(td, error); /* @@ -201,14 +236,16 @@ ia32_syscall(struct trapframe *frame) * Check for misbehavior. */ WITNESS_WARN(WARN_PANIC, NULL, "System call %s returning", - (code >= 0 && code < SYS_MAXSYSCALL) ? freebsd32_syscallnames[code] : "???"); + (sa.code >= 0 && sa.code < SYS_MAXSYSCALL) ? + freebsd32_syscallnames[sa.code] : "???"); KASSERT(td->td_critnest == 0, ("System call %s returning in a critical section", - (code >= 0 && code < SYS_MAXSYSCALL) ? freebsd32_syscallnames[code] : "???")); + (sa.code >= 0 && sa.code < SYS_MAXSYSCALL) ? + freebsd32_syscallnames[sa.code] : "???")); KASSERT(td->td_locks == 0, ("System call %s returning with %d locks held", - (code >= 0 && code < SYS_MAXSYSCALL) ? freebsd32_syscallnames[code] : "???", - td->td_locks)); + (sa.code >= 0 && sa.code < SYS_MAXSYSCALL) ? + freebsd32_syscallnames[sa.code] : "???", td->td_locks)); /* * Handle reschedule and other end-of-syscall issues @@ -216,10 +253,10 @@ ia32_syscall(struct trapframe *frame) userret(td, frame); CTR4(KTR_SYSC, "syscall exit thread %p pid %d proc %s code %d", td, - td->td_proc->p_pid, td->td_proc->p_comm, code); + td->td_proc->p_pid, td->td_proc->p_comm, sa.code); #ifdef KTRACE if (KTRPOINT(td, KTR_SYSRET)) - ktrsysret(code, error, td->td_retval[0]); + ktrsysret(sa.code, error, td->td_retval[0]); #endif /* @@ -227,7 +264,7 @@ ia32_syscall(struct trapframe *frame) * register set. If we ever support an emulation where this * is not the case, this code will need to be revisited. */ - STOPEVENT(p, S_SCX, code); + STOPEVENT(p, S_SCX, sa.code); PTRACESTOP_SC(p, td, S_PT_SCX); } Modified: stable/8/sys/i386/i386/trap.c ============================================================================== --- stable/8/sys/i386/i386/trap.c Sun Feb 7 10:51:17 2010 (r203607) +++ stable/8/sys/i386/i386/trap.c Sun Feb 7 11:37:38 2010 (r203608) @@ -971,97 +971,130 @@ dblfault_handler() panic("double fault"); } -/* - * syscall - system call request C handler - * - * A system call is essentially treated as a trap. - */ -void -syscall(struct trapframe *frame) -{ - caddr_t params; +struct syscall_args { + u_int code; struct sysent *callp; - struct thread *td = curthread; - struct proc *p = td->td_proc; - register_t orig_tf_eflags; - int error; - int narg; int args[8]; - u_int code; - ksiginfo_t ksi; + register_t *argp; + int narg; +}; - PCPU_INC(cnt.v_syscall); +static int +fetch_syscall_args(struct thread *td, struct syscall_args *sa) +{ + struct proc *p; + struct trapframe *frame; + caddr_t params; + int error; -#ifdef DIAGNOSTIC - if (ISPL(frame->tf_cs) != SEL_UPL) { - panic("syscall"); - /* NOT REACHED */ - } -#endif + p = td->td_proc; + frame = td->td_frame; - td->td_pticks = 0; - td->td_frame = frame; - if (td->td_ucred != p->p_ucred) - cred_update_thread(td); params = (caddr_t)frame->tf_esp + sizeof(int); - code = frame->tf_eax; - orig_tf_eflags = frame->tf_eflags; + sa->code = frame->tf_eax; if (p->p_sysent->sv_prepsyscall) { - (*p->p_sysent->sv_prepsyscall)(frame, args, &code, ¶ms); + (*p->p_sysent->sv_prepsyscall)(frame, sa->args, &sa->code, + ¶ms); } else { /* * Need to check if this is a 32 bit or 64 bit syscall. */ - if (code == SYS_syscall) { + if (sa->code == SYS_syscall) { /* * Code is first argument, followed by actual args. */ - code = fuword(params); + sa->code = fuword(params); params += sizeof(int); - } else if (code == SYS___syscall) { + } else if (sa->code == SYS___syscall) { /* * Like syscall, but code is a quad, so as to maintain * quad alignment for the rest of the arguments. */ - code = fuword(params); + sa->code = fuword(params); params += sizeof(quad_t); } } if (p->p_sysent->sv_mask) - code &= p->p_sysent->sv_mask; - - if (code >= p->p_sysent->sv_size) - callp = &p->p_sysent->sv_table[0]; + sa->code &= p->p_sysent->sv_mask; + if (sa->code >= p->p_sysent->sv_size) + sa->callp = &p->p_sysent->sv_table[0]; else - callp = &p->p_sysent->sv_table[code]; + sa->callp = &p->p_sysent->sv_table[sa->code]; + sa->narg = sa->callp->sy_narg; - narg = callp->sy_narg; - - if (params != NULL && narg != 0) - error = copyin(params, (caddr_t)args, - (u_int)(narg * sizeof(int))); + if (params != NULL && sa->narg != 0) + error = copyin(params, (caddr_t)sa->args, + (u_int)(sa->narg * sizeof(int))); else error = 0; #ifdef KTRACE if (KTRPOINT(td, KTR_SYSCALL)) - ktrsyscall(code, narg, args); + ktrsyscall(sa->code, sa->narg, sa->args); #endif + return (error); +} - CTR4(KTR_SYSC, "syscall enter thread %p pid %d proc %s code %d", td, - td->td_proc->p_pid, td->td_name, code); +/* + * syscall - system call request C handler + * + * A system call is essentially treated as a trap. + */ +void +syscall(struct trapframe *frame) +{ + struct thread *td; + struct proc *p; + struct syscall_args sa; + register_t orig_tf_eflags; + int error; + ksiginfo_t ksi; + PCPU_INC(cnt.v_syscall); + td = curthread; + p = td->td_proc; td->td_syscalls++; +#ifdef DIAGNOSTIC + if (ISPL(frame->tf_cs) != SEL_UPL) { + panic("syscall"); + /* NOT REACHED */ + } +#endif + + td->td_pticks = 0; + td->td_frame = frame; + if (td->td_ucred != p->p_ucred) + cred_update_thread(td); + orig_tf_eflags = frame->tf_eflags; + if (p->p_flag & P_TRACED) { + PROC_LOCK(p); + td->td_dbgflags &= ~TDB_USERWR; + PROC_UNLOCK(p); + } + error = fetch_syscall_args(td, &sa); + + CTR4(KTR_SYSC, "syscall enter thread %p pid %d proc %s code %d", td, + td->td_proc->p_pid, td->td_name, sa.code); + if (error == 0) { td->td_retval[0] = 0; td->td_retval[1] = frame->tf_edx; - STOPEVENT(p, S_SCE, narg); - + STOPEVENT(p, S_SCE, sa.narg); PTRACESTOP_SC(p, td, S_PT_SCE); + if (td->td_dbgflags & TDB_USERWR) { + /* + * Reread syscall number and arguments if + * debugger modified registers or memory. + */ + error = fetch_syscall_args(td, &sa); + if (error != 0) + goto retval; + td->td_retval[1] = frame->tf_edx; + } #ifdef KDTRACE_HOOKS /* @@ -1069,13 +1102,13 @@ syscall(struct trapframe *frame) * callback and if there is a probe active for the * syscall 'entry', process the probe. */ - if (systrace_probe_func != NULL && callp->sy_entry != 0) - (*systrace_probe_func)(callp->sy_entry, code, callp, - args); + if (systrace_probe_func != NULL && sa.callp->sy_entry != 0) + (*systrace_probe_func)(sa.callp->sy_entry, sa.code, + sa.callp, sa.args); #endif - AUDIT_SYSCALL_ENTER(code, td); - error = (*callp->sy_call)(td, args); + AUDIT_SYSCALL_ENTER(sa.code, td); + error = (*sa.callp->sy_call)(td, sa.args); AUDIT_SYSCALL_EXIT(error, td); /* Save the latest error return value. */ @@ -1087,12 +1120,12 @@ syscall(struct trapframe *frame) * callback and if there is a probe active for the * syscall 'return', process the probe. */ - if (systrace_probe_func != NULL && callp->sy_return != 0) - (*systrace_probe_func)(callp->sy_return, code, callp, - args); + if (systrace_probe_func != NULL && sa.callp->sy_return != 0) + (*systrace_probe_func)(sa.callp->sy_return, sa.code, + sa.callp, sa.args); #endif } - + retval: cpu_set_syscall_retval(td, error); /* @@ -1111,14 +1144,16 @@ syscall(struct trapframe *frame) * Check for misbehavior. */ WITNESS_WARN(WARN_PANIC, NULL, "System call %s returning", - (code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???"); + (sa.code >= 0 && sa.code < SYS_MAXSYSCALL) ? + syscallnames[sa.code] : "???"); KASSERT(td->td_critnest == 0, ("System call %s returning in a critical section", - (code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???")); + (sa.code >= 0 && sa.code < SYS_MAXSYSCALL) ? + syscallnames[sa.code] : "???")); KASSERT(td->td_locks == 0, ("System call %s returning with %d locks held", - (code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???", - td->td_locks)); + (sa.code >= 0 && sa.code < SYS_MAXSYSCALL) ? + syscallnames[sa.code] : "???", td->td_locks)); /* * Handle reschedule and other end-of-syscall issues @@ -1126,11 +1161,11 @@ syscall(struct trapframe *frame) userret(td, frame); CTR4(KTR_SYSC, "syscall exit thread %p pid %d proc %s code %d", td, - td->td_proc->p_pid, td->td_name, code); + td->td_proc->p_pid, td->td_name, sa.code); #ifdef KTRACE if (KTRPOINT(td, KTR_SYSRET)) - ktrsysret(code, error, td->td_retval[0]); + ktrsysret(sa.code, error, td->td_retval[0]); #endif /* @@ -1138,7 +1173,7 @@ syscall(struct trapframe *frame) * register set. If we ever support an emulation where this * is not the case, this code will need to be revisited. */ - STOPEVENT(p, S_SCX, code); + STOPEVENT(p, S_SCX, sa.code); PTRACESTOP_SC(p, td, S_PT_SCX); } Modified: stable/8/sys/kern/sys_process.c ============================================================================== --- stable/8/sys/kern/sys_process.c Sun Feb 7 10:51:17 2010 (r203607) +++ stable/8/sys/kern/sys_process.c Sun Feb 7 11:37:38 2010 (r203608) @@ -809,6 +809,7 @@ kern_ptrace(struct thread *td, int req, case PT_WRITE_I: case PT_WRITE_D: + td2->td_dbgflags |= TDB_USERWR; write = 1; /* FALLTHROUGH */ case PT_READ_I: @@ -877,6 +878,7 @@ kern_ptrace(struct thread *td, int req, break; case PIOD_WRITE_D: case PIOD_WRITE_I: + td2->td_dbgflags |= TDB_USERWR; uio.uio_rw = UIO_WRITE; break; default: @@ -899,6 +901,7 @@ kern_ptrace(struct thread *td, int req, goto sendsig; /* in PT_CONTINUE above */ case PT_SETREGS: + td2->td_dbgflags |= TDB_USERWR; error = PROC_WRITE(regs, td2, addr); break; @@ -907,6 +910,7 @@ kern_ptrace(struct thread *td, int req, break; case PT_SETFPREGS: + td2->td_dbgflags |= TDB_USERWR; error = PROC_WRITE(fpregs, td2, addr); break; @@ -915,6 +919,7 @@ kern_ptrace(struct thread *td, int req, break; case PT_SETDBREGS: + td2->td_dbgflags |= TDB_USERWR; error = PROC_WRITE(dbregs, td2, addr); break; Modified: stable/8/sys/sys/proc.h ============================================================================== --- stable/8/sys/sys/proc.h Sun Feb 7 10:51:17 2010 (r203607) +++ stable/8/sys/sys/proc.h Sun Feb 7 11:37:38 2010 (r203608) @@ -343,6 +343,7 @@ do { \ /* Userland debug flags */ #define TDB_SUSPEND 0x00000001 /* Thread is suspended by debugger */ #define TDB_XSIG 0x00000002 /* Thread is exchanging signal under trace */ +#define TDB_USERWR 0x00000004 /* Debugger modified memory or registers */ /* * "Private" flags kept in td_pflags:
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