diff options
author | dg <dg@FreeBSD.org> | 1993-11-16 09:54:57 +0000 |
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committer | dg <dg@FreeBSD.org> | 1993-11-16 09:54:57 +0000 |
commit | 156d1cd94abe1d84c9c789f2ecdab3d9319bffcb (patch) | |
tree | 3ee443a3e14741f6dd44b063356acc99a9b68dad /sys/amd64 | |
parent | 9ff4f18864dd67b440e023a4a65daa2bffbc495c (diff) | |
download | FreeBSD-src-156d1cd94abe1d84c9c789f2ecdab3d9319bffcb.zip FreeBSD-src-156d1cd94abe1d84c9c789f2ecdab3d9319bffcb.tar.gz |
new process tracing code from Sean Eric Fagen (sef@kithrup.com).
...also, fixed up the syscall args to make GCC happy.
Diffstat (limited to 'sys/amd64')
-rw-r--r-- | sys/amd64/amd64/machdep.c | 169 | ||||
-rw-r--r-- | sys/amd64/include/reg.h | 40 |
2 files changed, 197 insertions, 12 deletions
diff --git a/sys/amd64/amd64/machdep.c b/sys/amd64/amd64/machdep.c index 61948b0..ae1271f 100644 --- a/sys/amd64/amd64/machdep.c +++ b/sys/amd64/amd64/machdep.c @@ -35,7 +35,7 @@ * SUCH DAMAGE. * * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91 - * $Id: machdep.c,v 1.15 1993/11/07 21:47:00 wollman Exp $ + * $Id: machdep.c,v 1.16 1993/11/13 02:25:02 davidg Exp $ */ #include "npx.h" @@ -1239,6 +1239,173 @@ _remque(element) element->ph_rlink = (struct proc *)0; } +/* + * The registers are in the frame; the frame is in the user area of + * the process in question; when the process is active, the registers + * are in "the kernel stack"; when it's not, they're still there, but + * things get flipped around. So, since p->p_regs is the whole address + * of the register set, take its offset from the kernel stack, and + * index into the user block. Don't you just *love* virtual memory? + * (I'm starting to think seymour is right...) + */ + +int +ptrace_set_pc (struct proc *p, unsigned int addr) { + struct pcb *pcb; + void *regs = (char*)p->p_addr + + ((char*) p->p_regs - (char*) kstack); + + pcb = &p->p_addr->u_pcb; + if (pcb->pcb_flags & FM_TRAP) + ((struct trapframe *)regs)->tf_eip = addr; + else + ((struct syscframe *)regs)->sf_eip = addr; + return 0; +} + +int +ptrace_single_step (struct proc *p) { + struct pcb *pcb; + void *regs = (char*)p->p_addr + + ((char*) p->p_regs - (char*) kstack); + + pcb = &p->p_addr->u_pcb; + if (pcb->pcb_flags & FM_TRAP) + ((struct trapframe *)regs)->tf_eflags |= PSL_T; + else + ((struct syscframe *)regs)->sf_eflags |= PSL_T; + return 0; +} + +/* + * Copy the registers to user-space. This is tedious because + * we essentially duplicate code for trapframe and syscframe. *sigh* + */ + +int +ptrace_getregs (struct proc *p, unsigned int *addr) { + int error; + struct regs regs = {0}; + + if (error = fill_regs (p, ®s)) + return error; + + return copyout (®s, addr, sizeof (regs)); +} + +int +ptrace_setregs (struct proc *p, unsigned int *addr) { + int error; + struct regs regs = {0}; + + if (error = copyin (addr, ®s, sizeof(regs))) + return error; + + return set_regs (p, ®s); +} + +int +fill_regs(struct proc *p, struct regs *regs) { + int error; + struct trapframe *tp; + struct syscframe *sp; + struct pcb *pcb; + void *ptr = (char*)p->p_addr + + ((char*) p->p_regs - (char*) kstack); + + pcb = &p->p_addr->u_pcb; + if (pcb->pcb_flags & FM_TRAP) { + tp = ptr; + regs->r_es = tp->tf_es; + regs->r_ds = tp->tf_ds; + regs->r_edi = tp->tf_edi; + regs->r_esi = tp->tf_esi; + regs->r_ebp = tp->tf_ebp; + regs->r_ebx = tp->tf_ebx; + regs->r_edx = tp->tf_edx; + regs->r_ecx = tp->tf_ecx; + regs->r_eax = tp->tf_eax; + regs->r_eip = tp->tf_eip; + regs->r_cs = tp->tf_cs; + regs->r_eflags = tp->tf_eflags; + regs->r_esp = tp->tf_esp; + regs->r_ss = tp->tf_ss; + } else { + sp = ptr; + /* + * No sf_es or sf_ds... dunno why. + */ + /* + * regs.r_es = sp->sf_es; + * regs.r_ds = sp->sf_ds; + */ + regs->r_edi = sp->sf_edi; + regs->r_esi = sp->sf_esi; + regs->r_ebp = sp->sf_ebp; + regs->r_ebx = sp->sf_ebx; + regs->r_edx = sp->sf_edx; + regs->r_ecx = sp->sf_ecx; + regs->r_eax = sp->sf_eax; + regs->r_eip = sp->sf_eip; + regs->r_cs = sp->sf_cs; + regs->r_eflags = sp->sf_eflags; + regs->r_esp = sp->sf_esp; + regs->r_ss = sp->sf_ss; + } + return 0; +} + +int +set_regs (struct proc *p, struct regs *regs) { + int error; + struct trapframe *tp; + struct syscframe *sp; + struct pcb *pcb; + void *ptr = (char*)p->p_addr + + ((char*) p->p_regs - (char*) kstack); + + pcb = &p->p_addr->u_pcb; + if (pcb->pcb_flags & FM_TRAP) { + tp = ptr; + tp->tf_es = regs->r_es; + tp->tf_ds = regs->r_ds; + tp->tf_edi = regs->r_edi; + tp->tf_esi = regs->r_esi; + tp->tf_ebp = regs->r_ebp; + tp->tf_ebx = regs->r_ebx; + tp->tf_edx = regs->r_edx; + tp->tf_ecx = regs->r_ecx; + tp->tf_eax = regs->r_eax; + tp->tf_eip = regs->r_eip; + tp->tf_cs = regs->r_cs; + tp->tf_eflags = regs->r_eflags; + tp->tf_esp = regs->r_esp; + tp->tf_ss = regs->r_ss; + } else { + sp = ptr; + /* + * No sf_es or sf_ds members, dunno why... + */ + /* + * sp->sf_es = regs.r_es; + * sp->sf_ds = regs.r_ds; + */ + sp->sf_edi = regs->r_edi; + sp->sf_esi = regs->r_esi; + sp->sf_ebp = regs->r_ebp; + sp->sf_ebx = regs->r_ebx; + sp->sf_edx = regs->r_edx; + sp->sf_ecx = regs->r_ecx; + sp->sf_eax = regs->r_eax; + sp->sf_eip = regs->r_eip; + sp->sf_cs = regs->r_cs; + sp->sf_eflags = regs->r_eflags; + sp->sf_esp = regs->r_esp; + sp->sf_ss = regs->r_ss; + } + return 0; +} + #ifdef SLOW_OLD_COPYSTRS vmunaccess() {} diff --git a/sys/amd64/include/reg.h b/sys/amd64/include/reg.h index 46f6b80..55f1556 100644 --- a/sys/amd64/include/reg.h +++ b/sys/amd64/include/reg.h @@ -34,7 +34,7 @@ * SUCH DAMAGE. * * from: @(#)reg.h 5.5 (Berkeley) 1/18/91 - * $Id: reg.h,v 1.2 1993/10/16 14:39:29 rgrimes Exp $ + * $Id: reg.h,v 1.3 1993/11/07 17:43:07 wollman Exp $ */ #ifndef _MACHINE_REG_H_ @@ -82,17 +82,35 @@ #define sESP (11) #define sSS (12) -#define PC sEIP -#define SP sESP -#define PS sEFLAGS -#define R0 sEDX -#define R1 sECX +#define PC sEIP +#define SP sESP +#define PS sEFLAGS +#define R0 sEDX +#define R1 sECX + /* * Registers accessible to ptrace(2) syscall for debugger + * The machine-dependent code for PT_{SET,GET}REGS needs to + * use whichver order, defined above, is correct, so that it + * is all invisible to the user. */ -#ifdef IPCREG -#define NIPCREG 14 -int ipcreg[NIPCREG] = - { tES,tDS,tEDI,tESI,tEBP,tEBX,tEDX,tECX,tEAX,tEIP,tCS,tEFLAGS,tESP,tSS }; -#endif +struct regs { + unsigned int r_es; + unsigned int r_ds; + unsigned int r_edi; + unsigned int r_esi; + unsigned int r_ebp; + unsigned int r_ebx; + unsigned int r_edx; + unsigned int r_ecx; + unsigned int r_eax; + unsigned int r_eip; + unsigned int r_cs; + unsigned int r_eflags; + unsigned int r_esp; + unsigned int r_ss; + unsigned int r_fs; + unsigned int r_gs; +}; + #endif /* _MACHINE_REG_H_ */ |