diff options
Diffstat (limited to 'sys/cddl/dev/dtrace/i386/dtrace_isa.c')
| -rw-r--r-- | sys/cddl/dev/dtrace/i386/dtrace_isa.c | 622 |
1 files changed, 622 insertions, 0 deletions
diff --git a/sys/cddl/dev/dtrace/i386/dtrace_isa.c b/sys/cddl/dev/dtrace/i386/dtrace_isa.c new file mode 100644 index 0000000..bf891aa --- /dev/null +++ b/sys/cddl/dev/dtrace/i386/dtrace_isa.c @@ -0,0 +1,622 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License, Version 1.0 only + * (the "License"). You may not use this file except in compliance + * with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + * + * $FreeBSD$ + */ +/* + * Copyright 2005 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ +#include <sys/cdefs.h> + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/stack.h> +#include <sys/pcpu.h> + +#include <machine/md_var.h> +#include <machine/stack.h> + +#include <vm/vm.h> +#include <vm/vm_param.h> +#include <vm/pmap.h> + +extern uintptr_t kernbase; +uintptr_t kernelbase = (uintptr_t) &kernbase; + +#define INKERNEL(va) (((vm_offset_t)(va)) >= USRSTACK && \ + ((vm_offset_t)(va)) < VM_MAX_KERNEL_ADDRESS) + +uint8_t dtrace_fuword8_nocheck(void *); +uint16_t dtrace_fuword16_nocheck(void *); +uint32_t dtrace_fuword32_nocheck(void *); +uint64_t dtrace_fuword64_nocheck(void *); + +void +dtrace_getpcstack(pc_t *pcstack, int pcstack_limit, int aframes, + uint32_t *intrpc) +{ + int depth = 0; + register_t ebp; + struct i386_frame *frame; + vm_offset_t callpc; + pc_t caller = (pc_t) solaris_cpu[curcpu].cpu_dtrace_caller; + + if (intrpc != 0) + pcstack[depth++] = (pc_t) intrpc; + + aframes++; + + __asm __volatile("movl %%ebp,%0" : "=r" (ebp)); + + frame = (struct i386_frame *)ebp; + while (depth < pcstack_limit) { + if (!INKERNEL(frame)) + break; + + callpc = frame->f_retaddr; + + if (!INKERNEL(callpc)) + break; + + if (aframes > 0) { + aframes--; + if ((aframes == 0) && (caller != 0)) { + pcstack[depth++] = caller; + } + } + else { + pcstack[depth++] = callpc; + } + + if (frame->f_frame <= frame || + (vm_offset_t)frame->f_frame >= + (vm_offset_t)ebp + KSTACK_PAGES * PAGE_SIZE) + break; + frame = frame->f_frame; + } + + for (; depth < pcstack_limit; depth++) { + pcstack[depth] = 0; + } +} + +#ifdef notyet +static int +dtrace_getustack_common(uint64_t *pcstack, int pcstack_limit, uintptr_t pc, + uintptr_t sp) +{ + klwp_t *lwp = ttolwp(curthread); + proc_t *p = curproc; + uintptr_t oldcontext = lwp->lwp_oldcontext; + volatile uint16_t *flags = + (volatile uint16_t *)&cpu_core[curcpu].cpuc_dtrace_flags; + size_t s1, s2; + int ret = 0; + + ASSERT(pcstack == NULL || pcstack_limit > 0); + + if (p->p_model == DATAMODEL_NATIVE) { + s1 = sizeof (struct frame) + 2 * sizeof (long); + s2 = s1 + sizeof (siginfo_t); + } else { + s1 = sizeof (struct frame32) + 3 * sizeof (int); + s2 = s1 + sizeof (siginfo32_t); + } + + while (pc != 0 && sp != 0) { + ret++; + if (pcstack != NULL) { + *pcstack++ = (uint64_t)pc; + pcstack_limit--; + if (pcstack_limit <= 0) + break; + } + + if (oldcontext == sp + s1 || oldcontext == sp + s2) { + if (p->p_model == DATAMODEL_NATIVE) { + ucontext_t *ucp = (ucontext_t *)oldcontext; + greg_t *gregs = ucp->uc_mcontext.gregs; + + sp = dtrace_fulword(&gregs[REG_FP]); + pc = dtrace_fulword(&gregs[REG_PC]); + + oldcontext = dtrace_fulword(&ucp->uc_link); + } else { + ucontext32_t *ucp = (ucontext32_t *)oldcontext; + greg32_t *gregs = ucp->uc_mcontext.gregs; + + sp = dtrace_fuword32(&gregs[EBP]); + pc = dtrace_fuword32(&gregs[EIP]); + + oldcontext = dtrace_fuword32(&ucp->uc_link); + } + } else { + if (p->p_model == DATAMODEL_NATIVE) { + struct frame *fr = (struct frame *)sp; + + pc = dtrace_fulword(&fr->fr_savpc); + sp = dtrace_fulword(&fr->fr_savfp); + } else { + struct frame32 *fr = (struct frame32 *)sp; + + pc = dtrace_fuword32(&fr->fr_savpc); + sp = dtrace_fuword32(&fr->fr_savfp); + } + } + + /* + * This is totally bogus: if we faulted, we're going to clear + * the fault and break. This is to deal with the apparently + * broken Java stacks on x86. + */ + if (*flags & CPU_DTRACE_FAULT) { + *flags &= ~CPU_DTRACE_FAULT; + break; + } + } + + return (ret); +} + +void +dtrace_getupcstack(uint64_t *pcstack, int pcstack_limit) +{ + klwp_t *lwp = ttolwp(curthread); + proc_t *p = curproc; + struct regs *rp; + uintptr_t pc, sp; + volatile uint16_t *flags = + (volatile uint16_t *)&cpu_core[curcpu].cpuc_dtrace_flags; + int n; + + if (*flags & CPU_DTRACE_FAULT) + return; + + if (pcstack_limit <= 0) + return; + + /* + * If there's no user context we still need to zero the stack. + */ + if (lwp == NULL || p == NULL || (rp = lwp->lwp_regs) == NULL) + goto zero; + + *pcstack++ = (uint64_t)p->p_pid; + pcstack_limit--; + + if (pcstack_limit <= 0) + return; + + pc = rp->r_pc; + sp = rp->r_fp; + + if (DTRACE_CPUFLAG_ISSET(CPU_DTRACE_ENTRY)) { + *pcstack++ = (uint64_t)pc; + pcstack_limit--; + if (pcstack_limit <= 0) + return; + + if (p->p_model == DATAMODEL_NATIVE) + pc = dtrace_fulword((void *)rp->r_sp); + else + pc = dtrace_fuword32((void *)rp->r_sp); + } + + n = dtrace_getustack_common(pcstack, pcstack_limit, pc, sp); + ASSERT(n >= 0); + ASSERT(n <= pcstack_limit); + + pcstack += n; + pcstack_limit -= n; + +zero: + while (pcstack_limit-- > 0) + *pcstack++ = NULL; +} + +int +dtrace_getustackdepth(void) +{ +} + +void +dtrace_getufpstack(uint64_t *pcstack, uint64_t *fpstack, int pcstack_limit) +{ + klwp_t *lwp = ttolwp(curthread); + proc_t *p = curproc; + struct regs *rp; + uintptr_t pc, sp, oldcontext; + volatile uint16_t *flags = + (volatile uint16_t *)&cpu_core[curcpu].cpuc_dtrace_flags; + size_t s1, s2; + + if (*flags & CPU_DTRACE_FAULT) + return; + + if (pcstack_limit <= 0) + return; + + /* + * If there's no user context we still need to zero the stack. + */ + if (lwp == NULL || p == NULL || (rp = lwp->lwp_regs) == NULL) + goto zero; + + *pcstack++ = (uint64_t)p->p_pid; + pcstack_limit--; + + if (pcstack_limit <= 0) + return; + + pc = rp->r_pc; + sp = rp->r_fp; + oldcontext = lwp->lwp_oldcontext; + + if (p->p_model == DATAMODEL_NATIVE) { + s1 = sizeof (struct frame) + 2 * sizeof (long); + s2 = s1 + sizeof (siginfo_t); + } else { + s1 = sizeof (struct frame32) + 3 * sizeof (int); + s2 = s1 + sizeof (siginfo32_t); + } + + if (DTRACE_CPUFLAG_ISSET(CPU_DTRACE_ENTRY)) { + *pcstack++ = (uint64_t)pc; + *fpstack++ = 0; + pcstack_limit--; + if (pcstack_limit <= 0) + return; + + if (p->p_model == DATAMODEL_NATIVE) + pc = dtrace_fulword((void *)rp->r_sp); + else + pc = dtrace_fuword32((void *)rp->r_sp); + } + + while (pc != 0 && sp != 0) { + *pcstack++ = (uint64_t)pc; + *fpstack++ = sp; + pcstack_limit--; + if (pcstack_limit <= 0) + break; + + if (oldcontext == sp + s1 || oldcontext == sp + s2) { + if (p->p_model == DATAMODEL_NATIVE) { + ucontext_t *ucp = (ucontext_t *)oldcontext; + greg_t *gregs = ucp->uc_mcontext.gregs; + + sp = dtrace_fulword(&gregs[REG_FP]); + pc = dtrace_fulword(&gregs[REG_PC]); + + oldcontext = dtrace_fulword(&ucp->uc_link); + } else { + ucontext_t *ucp = (ucontext_t *)oldcontext; + greg_t *gregs = ucp->uc_mcontext.gregs; + + sp = dtrace_fuword32(&gregs[EBP]); + pc = dtrace_fuword32(&gregs[EIP]); + + oldcontext = dtrace_fuword32(&ucp->uc_link); + } + } else { + if (p->p_model == DATAMODEL_NATIVE) { + struct frame *fr = (struct frame *)sp; + + pc = dtrace_fulword(&fr->fr_savpc); + sp = dtrace_fulword(&fr->fr_savfp); + } else { + struct frame32 *fr = (struct frame32 *)sp; + + pc = dtrace_fuword32(&fr->fr_savpc); + sp = dtrace_fuword32(&fr->fr_savfp); + } + } + + /* + * This is totally bogus: if we faulted, we're going to clear + * the fault and break. This is to deal with the apparently + * broken Java stacks on x86. + */ + if (*flags & CPU_DTRACE_FAULT) { + *flags &= ~CPU_DTRACE_FAULT; + break; + } + } + +zero: + while (pcstack_limit-- > 0) + *pcstack++ = NULL; +} +#endif + +uint64_t +dtrace_getarg(int arg, int aframes) +{ + uintptr_t val; + struct i386_frame *fp = (struct i386_frame *)dtrace_getfp(); + uintptr_t *stack; + int i; + + for (i = 1; i <= aframes; i++) { + fp = fp->f_frame; + + if (fp->f_retaddr == (long)dtrace_invop_callsite) { + /* + * If we pass through the invalid op handler, we will + * use the pointer that it passed to the stack as the + * second argument to dtrace_invop() as the pointer to + * the stack. When using this stack, we must step + * beyond the EIP/RIP that was pushed when the trap was + * taken -- hence the "+ 1" below. + */ + stack = ((uintptr_t **)&fp[1])[1] + 1; + goto load; + } + + } + + /* + * We know that we did not come through a trap to get into + * dtrace_probe() -- the provider simply called dtrace_probe() + * directly. As this is the case, we need to shift the argument + * that we're looking for: the probe ID is the first argument to + * dtrace_probe(), so the argument n will actually be found where + * one would expect to find argument (n + 1). + */ + arg++; + + stack = (uintptr_t *)&fp[1]; + +load: + DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT); + val = stack[arg]; + DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT); + + return (val); +} + +int +dtrace_getstackdepth(int aframes) +{ + int depth = 0; + struct i386_frame *frame; + vm_offset_t ebp; + + aframes++; + ebp = dtrace_getfp(); + frame = (struct i386_frame *)ebp; + depth++; + for(;;) { + if (!INKERNEL((long) frame)) + break; + if (!INKERNEL((long) frame->f_frame)) + break; + depth++; + if (frame->f_frame <= frame || + (vm_offset_t)frame->f_frame >= + (vm_offset_t)ebp + KSTACK_PAGES * PAGE_SIZE) + break; + frame = frame->f_frame; + } + if (depth < aframes) + return 0; + else + return depth - aframes; +} + +#ifdef notyet +ulong_t +dtrace_getreg(struct regs *rp, uint_t reg) +{ +#if defined(__amd64) + int regmap[] = { + REG_GS, /* GS */ + REG_FS, /* FS */ + REG_ES, /* ES */ + REG_DS, /* DS */ + REG_RDI, /* EDI */ + REG_RSI, /* ESI */ + REG_RBP, /* EBP */ + REG_RSP, /* ESP */ + REG_RBX, /* EBX */ + REG_RDX, /* EDX */ + REG_RCX, /* ECX */ + REG_RAX, /* EAX */ + REG_TRAPNO, /* TRAPNO */ + REG_ERR, /* ERR */ + REG_RIP, /* EIP */ + REG_CS, /* CS */ + REG_RFL, /* EFL */ + REG_RSP, /* UESP */ + REG_SS /* SS */ + }; + + if (reg <= SS) { + if (reg >= sizeof (regmap) / sizeof (int)) { + DTRACE_CPUFLAG_SET(CPU_DTRACE_ILLOP); + return (0); + } + + reg = regmap[reg]; + } else { + reg -= SS + 1; + } + + switch (reg) { + case REG_RDI: + return (rp->r_rdi); + case REG_RSI: + return (rp->r_rsi); + case REG_RDX: + return (rp->r_rdx); + case REG_RCX: + return (rp->r_rcx); + case REG_R8: + return (rp->r_r8); + case REG_R9: + return (rp->r_r9); + case REG_RAX: + return (rp->r_rax); + case REG_RBX: + return (rp->r_rbx); + case REG_RBP: + return (rp->r_rbp); + case REG_R10: + return (rp->r_r10); + case REG_R11: + return (rp->r_r11); + case REG_R12: + return (rp->r_r12); + case REG_R13: + return (rp->r_r13); + case REG_R14: + return (rp->r_r14); + case REG_R15: + return (rp->r_r15); + case REG_DS: + return (rp->r_ds); + case REG_ES: + return (rp->r_es); + case REG_FS: + return (rp->r_fs); + case REG_GS: + return (rp->r_gs); + case REG_TRAPNO: + return (rp->r_trapno); + case REG_ERR: + return (rp->r_err); + case REG_RIP: + return (rp->r_rip); + case REG_CS: + return (rp->r_cs); + case REG_SS: + return (rp->r_ss); + case REG_RFL: + return (rp->r_rfl); + case REG_RSP: + return (rp->r_rsp); + default: + DTRACE_CPUFLAG_SET(CPU_DTRACE_ILLOP); + return (0); + } + +#else + if (reg > SS) { + DTRACE_CPUFLAG_SET(CPU_DTRACE_ILLOP); + return (0); + } + + return ((&rp->r_gs)[reg]); +#endif +} +#endif + +static int +dtrace_copycheck(uintptr_t uaddr, uintptr_t kaddr, size_t size) +{ + ASSERT(kaddr >= kernelbase && kaddr + size >= kaddr); + + if (uaddr + size >= kernelbase || uaddr + size < uaddr) { + DTRACE_CPUFLAG_SET(CPU_DTRACE_BADADDR); + cpu_core[curcpu].cpuc_dtrace_illval = uaddr; + return (0); + } + + return (1); +} + +void +dtrace_copyin(uintptr_t uaddr, uintptr_t kaddr, size_t size, + volatile uint16_t *flags) +{ + if (dtrace_copycheck(uaddr, kaddr, size)) + dtrace_copy(uaddr, kaddr, size); +} + +void +dtrace_copyout(uintptr_t kaddr, uintptr_t uaddr, size_t size, + volatile uint16_t *flags) +{ + if (dtrace_copycheck(uaddr, kaddr, size)) + dtrace_copy(kaddr, uaddr, size); +} + +void +dtrace_copyinstr(uintptr_t uaddr, uintptr_t kaddr, size_t size, + volatile uint16_t *flags) +{ + if (dtrace_copycheck(uaddr, kaddr, size)) + dtrace_copystr(uaddr, kaddr, size, flags); +} + +void +dtrace_copyoutstr(uintptr_t kaddr, uintptr_t uaddr, size_t size, + volatile uint16_t *flags) +{ + if (dtrace_copycheck(uaddr, kaddr, size)) + dtrace_copystr(kaddr, uaddr, size, flags); +} + +uint8_t +dtrace_fuword8(void *uaddr) +{ + if ((uintptr_t)uaddr >= kernelbase) { + DTRACE_CPUFLAG_SET(CPU_DTRACE_BADADDR); + cpu_core[curcpu].cpuc_dtrace_illval = (uintptr_t)uaddr; + return (0); + } + return (dtrace_fuword8_nocheck(uaddr)); +} + +uint16_t +dtrace_fuword16(void *uaddr) +{ + if ((uintptr_t)uaddr >= kernelbase) { + DTRACE_CPUFLAG_SET(CPU_DTRACE_BADADDR); + cpu_core[curcpu].cpuc_dtrace_illval = (uintptr_t)uaddr; + return (0); + } + return (dtrace_fuword16_nocheck(uaddr)); +} + +uint32_t +dtrace_fuword32(void *uaddr) +{ + if ((uintptr_t)uaddr >= kernelbase) { + DTRACE_CPUFLAG_SET(CPU_DTRACE_BADADDR); + cpu_core[curcpu].cpuc_dtrace_illval = (uintptr_t)uaddr; + return (0); + } + return (dtrace_fuword32_nocheck(uaddr)); +} + +uint64_t +dtrace_fuword64(void *uaddr) +{ + if ((uintptr_t)uaddr >= kernelbase) { + DTRACE_CPUFLAG_SET(CPU_DTRACE_BADADDR); + cpu_core[curcpu].cpuc_dtrace_illval = (uintptr_t)uaddr; + return (0); + } + return (dtrace_fuword64_nocheck(uaddr)); +} |
