implement PTRACE_{GET|SET}FPREGS and framework for PTRACE_{PEEK|POKE}USER
this makes it possible to attach to linux process with linux gdb and see top-most function on traceback; lower functions are not available, probably due to bad frame setup it's not possible to setup breakpoints - Linux gdb uses hw breakpoints, so support for them would need to be written
This commit is contained in:
jdolecek
parent
a53687b13e
commit
ad1c55c73b
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@ -1,4 +1,4 @@
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/* $NetBSD: linux_ptrace.c,v 1.4 2000/11/01 21:02:08 jdolecek Exp $ */
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/* $NetBSD: linux_ptrace.c,v 1.5 2000/11/21 12:28:15 jdolecek Exp $ */
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/*-
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* Copyright (c) 1999 The NetBSD Foundation, Inc.
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@ -38,11 +38,13 @@
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/ptrace.h>
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#include <sys/systm.h>
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#include <sys/syscallargs.h>
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#include <uvm/uvm_extern.h>
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#include <machine/reg.h>
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@ -52,9 +54,13 @@
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#include <compat/linux/common/linux_util.h>
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#include <compat/linux/common/linux_machdep.h>
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#include <compat/linux/common/linux_emuldata.h>
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#include <compat/linux/common/linux_exec.h> /* for emul_linux */
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#include <compat/linux/linux_syscallargs.h>
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#include <lib/libkern/libkern.h> /* for offsetof() */
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struct linux_reg {
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long ebx;
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long ecx;
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@ -63,17 +69,57 @@ struct linux_reg {
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long edi;
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long ebp;
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long eax;
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int xds;
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int xes;
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long xds, xes; // unsigned short ds, __ds, es, __es;
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long __fs, __gs; // unsigned short fs, __fs, gs, __gs;
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long orig_eax;
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long eip;
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int xcs;
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long xcs; // unsigned short cs, __cs;
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long eflags;
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long esp;
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int xss;
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long xss; // unsigned short ss, __ss
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};
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#define ISSET(t, f) ((t) & (f))
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/* structure used for storing floating point context */
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struct linux_fpreg {
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long cwd;
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long swd;
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long twd;
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long fip;
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long fcs;
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long foo;
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long fos;
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long st_space [20];
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};
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/* user struct for linux process - this is used for Linux ptrace emulation */
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/* most of it is junk only used by gdb */
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struct linux_user {
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struct linux_reg regs; /* registers */
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int u_fpvalid; /* true if math co-processor being used. */
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struct linux_fpreg i387; /* Math Co-processor registers. */
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/* The rest of this junk is to help gdb figure out what goes where */
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#define lusr_startgdb u_tsize
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unsigned long int u_tsize; /* Text segment size (pages). */
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unsigned long int u_dsize; /* Data segment size (pages). */
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unsigned long int u_ssize; /* Stack segment size (pages). */
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unsigned long start_code; /* Starting virtual address of text. */
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unsigned long start_stack; /* Starting virtual address of stack area.
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This is actually the bottom of the stack,
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the top of the stack is always found in the
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esp register. */
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long int __signal; /* Signal that caused the core dump. */
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int __reserved; /* unused */
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void * u_ar0; /* Used by gdb to help find the values for */
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/* the registers. */
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struct linux_fpreg* u_fpstate;/* Math Co-processor pointer. */
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unsigned long __magic; /* To uniquely identify a core file */
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char u_comm[32]; /* User command that was responsible */
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int u_debugreg[8];
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#define u_debugreg_end u_debugreg[7]
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};
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#define LUSR_OFF(member) offsetof(struct linux_user, member)
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#define ISSET(t, f) ((t) & (f))
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int
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linux_sys_ptrace_arch(p, v, retval)
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@ -89,12 +135,17 @@ linux_sys_ptrace_arch(p, v, retval)
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} */ *uap = v;
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int request, error;
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struct proc *t; /* target process */
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struct reg regs;
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struct linux_reg linux_regs;
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struct reg *regs = NULL;
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struct fpreg *fpregs = NULL;
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struct linux_reg *linux_regs = NULL;
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struct linux_fpreg *linux_fpregs = NULL;
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int addr;
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request = SCARG(uap, request);
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if ((request != LINUX_PTRACE_GETREGS) &&
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if ((request != LINUX_PTRACE_PEEKUSR) &&
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(request != LINUX_PTRACE_POKEUSR) &&
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(request != LINUX_PTRACE_GETREGS) &&
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(request != LINUX_PTRACE_SETREGS) &&
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(request != LINUX_PTRACE_GETFPREGS) &&
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(request != LINUX_PTRACE_SETFPREGS))
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@ -134,51 +185,186 @@ linux_sys_ptrace_arch(p, v, retval)
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switch (request) {
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case LINUX_PTRACE_GETREGS:
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error = process_read_regs(t, ®s);
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MALLOC(regs, struct reg*, sizeof(struct reg), M_TEMP, M_WAITOK);
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MALLOC(linux_regs, struct linux_reg*, sizeof(struct linux_reg),
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M_TEMP, M_WAITOK);
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error = process_read_regs(t, regs);
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if (error != 0)
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return error;
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goto out;
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linux_regs.ebx = regs.r_ebx;
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linux_regs.ecx = regs.r_ecx;
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linux_regs.edx = regs.r_edx;
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linux_regs.esi = regs.r_esi;
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linux_regs.edi = regs.r_edi;
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linux_regs.ebp = regs.r_ebp;
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linux_regs.eax = regs.r_eax;
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linux_regs.xds = regs.r_ds;
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linux_regs.xes = regs.r_es;
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linux_regs.orig_eax = regs.r_eax; /* XXX is this correct? */
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linux_regs.eip = regs.r_eip;
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linux_regs.xcs = regs.r_cs;
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linux_regs.eflags = regs.r_eflags;
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linux_regs.esp = regs.r_esp;
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linux_regs.xss = regs.r_ss;
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linux_regs->ebx = regs->r_ebx;
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linux_regs->ecx = regs->r_ecx;
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linux_regs->edx = regs->r_edx;
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linux_regs->esi = regs->r_esi;
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linux_regs->edi = regs->r_edi;
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linux_regs->ebp = regs->r_ebp;
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linux_regs->eax = regs->r_eax;
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linux_regs->xds = regs->r_ds;
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linux_regs->xes = regs->r_es;
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linux_regs->orig_eax = regs->r_eax; /* XXX is this correct? */
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linux_regs->eip = regs->r_cs + regs->r_eip;
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linux_regs->xcs = regs->r_cs;
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linux_regs->eflags = regs->r_eflags;
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linux_regs->esp = regs->r_esp;
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linux_regs->xss = regs->r_ss;
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return copyout(&linux_regs, (caddr_t)SCARG(uap, data),
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error = copyout(linux_regs, (caddr_t)SCARG(uap, data),
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sizeof(struct linux_reg));
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goto out;
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case LINUX_PTRACE_SETREGS:
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error = copyin((caddr_t)SCARG(uap, data), &linux_regs,
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MALLOC(regs, struct reg*, sizeof(struct reg), M_TEMP, M_WAITOK);
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MALLOC(linux_regs, struct linux_reg *, sizeof(struct linux_reg),
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M_TEMP, M_WAITOK);
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error = copyin((caddr_t)SCARG(uap, data), linux_regs,
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sizeof(struct linux_reg));
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if (error != 0)
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return error;
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goto out;
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regs.r_ebx = linux_regs.ebx;
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regs.r_ecx = linux_regs.ecx;
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regs.r_edx = linux_regs.edx;
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regs.r_esi = linux_regs.esi;
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regs.r_edi = linux_regs.edi;
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regs.r_ebp = linux_regs.ebp;
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regs.r_eax = linux_regs.eax;
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regs.r_ds = linux_regs.xds;
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regs.r_es = linux_regs.xes;
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regs.r_eip = linux_regs.eip;
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regs.r_cs = linux_regs.xcs;
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regs.r_eflags = linux_regs.eflags;
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regs.r_esp = linux_regs.esp;
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regs.r_ss = linux_regs.xss;
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regs->r_ebx = linux_regs->ebx;
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regs->r_ecx = linux_regs->ecx;
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regs->r_edx = linux_regs->edx;
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regs->r_esi = linux_regs->esi;
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regs->r_edi = linux_regs->edi;
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regs->r_ebp = linux_regs->ebp;
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regs->r_eax = linux_regs->eax;
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regs->r_ds = linux_regs->xds;
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regs->r_es = linux_regs->xes;
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regs->r_eip = linux_regs->eip - linux_regs->xcs;
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regs->r_cs = linux_regs->xcs;
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regs->r_eflags = linux_regs->eflags;
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regs->r_esp = linux_regs->esp;
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regs->r_ss = linux_regs->xss;
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return process_write_regs(t, ®s);
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error = process_write_regs(t, regs);
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goto out;
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case LINUX_PTRACE_GETFPREGS:
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MALLOC(fpregs, struct fpreg *, sizeof(struct fpreg),
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M_TEMP, M_WAITOK);
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MALLOC(linux_fpregs, struct linux_fpreg *,
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sizeof(struct linux_fpreg), M_TEMP, M_WAITOK);
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error = process_read_fpregs(t, fpregs);
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if (error != 0)
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goto out;
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/* zero the contents if NetBSD fpreg structure is smaller */
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if (sizeof(struct fpreg) < sizeof(struct linux_fpreg))
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memset(linux_fpregs, '\0', sizeof(struct linux_fpreg));
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memcpy(linux_fpregs, fpregs,
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min(sizeof(struct linux_fpreg), sizeof(struct fpreg)));
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error = copyout(linux_fpregs, (caddr_t)SCARG(uap, data),
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sizeof(struct linux_fpreg));
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goto out;
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case LINUX_PTRACE_SETFPREGS:
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MALLOC(fpregs, struct fpreg *, sizeof(struct fpreg),
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M_TEMP, M_WAITOK);
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MALLOC(linux_fpregs, struct linux_fpreg *,
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sizeof(struct linux_fpreg), M_TEMP, M_WAITOK);
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error = copyin((caddr_t)SCARG(uap, data), linux_fpregs,
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sizeof(struct linux_fpreg));
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if (error != 0)
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goto out;
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memset(fpregs, '\0', sizeof(struct fpreg));
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memcpy(fpregs, linux_fpregs,
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min(sizeof(struct linux_fpreg), sizeof(struct fpreg)));
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error = process_write_regs(t, regs);
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goto out;
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case LINUX_PTRACE_PEEKUSR:
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addr = SCARG(uap, addr);
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PHOLD(t); /* need full process info */
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error = 0;
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if (addr < LUSR_OFF(lusr_startgdb)) {
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/* XXX should provide appropriate register */
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error = 1;
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} else if (addr == LUSR_OFF(u_tsize))
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*retval = p->p_vmspace->vm_tsize;
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else if (addr == LUSR_OFF(u_dsize))
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*retval = p->p_vmspace->vm_dsize;
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else if (addr == LUSR_OFF(u_ssize))
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*retval = p->p_vmspace->vm_ssize;
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else if (addr == LUSR_OFF(start_code))
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*retval = (register_t) p->p_vmspace->vm_taddr;
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else if (addr == LUSR_OFF(start_stack))
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*retval = (register_t) p->p_vmspace->vm_minsaddr;
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else if (addr == LUSR_OFF(u_ar0))
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*retval = LUSR_OFF(regs);
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else if (addr >= LUSR_OFF(u_debugreg)
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&& addr <= LUSR_OFF(u_debugreg_end)) {
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int off = (addr - LUSR_OFF(u_debugreg)) / sizeof(int);
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/* only do this for Linux processes */
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if (t->p_emul != &emul_linux)
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error = EINVAL;
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else {
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*retval = ((struct linux_emuldata *)
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t->p_emuldata)->debugreg[off];
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}
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} else if (addr == LUSR_OFF(__signal)) {
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error = 1;
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} else if (addr == LUSR_OFF(__signal)) {
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error = 1;
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} else if (addr == LUSR_OFF(u_fpstate)) {
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error = 1;
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} else if (addr == LUSR_OFF(__magic)) {
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error = 1;
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} else if (addr == LUSR_OFF(u_comm)) {
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error = 1;
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} else {
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#ifdef DEBUG_LINUX
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printf("linux_ptrace: unsupported address: %d\n", addr);
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#endif
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error = 1;
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}
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PRELE(t);
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if (!error)
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return 0;
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case LINUX_PTRACE_POKEUSR:
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/* we only support setting debugregs for now */
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addr = SCARG(uap, addr);
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if (addr >= LUSR_OFF(u_debugreg)
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&& addr <= LUSR_OFF(u_debugreg_end)) {
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int off = (addr - LUSR_OFF(u_debugreg)) / sizeof(int);
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int data = SCARG(uap, data);
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/* only do this for Linux processes */
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if (t->p_emul != &emul_linux)
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return EINVAL;
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PHOLD(t);
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((struct linux_emuldata *)t->p_emuldata)->debugreg[off] = data;
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PRELE(t);
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return (0);
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}
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break;
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default:
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/* never reached */
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break;
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}
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return EIO;
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out:
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if (regs)
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FREE(regs, M_TEMP);
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if (fpregs)
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FREE(fpregs, M_TEMP);
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if (linux_regs)
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FREE(linux_regs, M_TEMP);
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if (linux_fpregs)
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FREE(linux_fpregs, M_TEMP);
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return (error);
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}
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