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[POWERPC] Allow ptrace write to pt_regs trap and orig_r3

Sfoglia il codice sorgente 
This patch allows a ptracer to write to the "trap" and "orig_r3" words
of the pt_regs.

This, along with a subsequent patch to the signal restart code, should
enable gdb to properly handle syscall restarting after executing a separate
function (at least when there's no restart block).

This patch also removes ptrace32.c code toying directly with the registers
and makes it use the ptrace_get/put_reg() accessors for everything so that
the logic for checking what is permitted is in only one place.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt
2007-06-04 15:15:46 +10:00
committato da Paul Mackerras
parent 1b6610d6fc
commit 912000e73e
2 ha cambiato i file con 20 aggiunte e 16 eliminazioni
Scarica il file Patch Scarica il file Diff Expand all files Collapse all files

27
arch/powerpc/kernel/ptrace32.c
Vedi File

@@ -206,7 +206,9 @@ long compat_sys_ptrace(int request, int pid, unsigned long addr,
else
part = 0; /* want the 1st half of the register (left-most). */
/* Validate the input - check to see if address is on the wrong boundary or beyond the end of the user area */
/* Validate the input - check to see if address is on the wrong boundary
* or beyond the end of the user area
*/
if ((addr & 3) || numReg > PT_FPSCR)
break;
@@ -270,8 +272,6 @@ long compat_sys_ptrace(int request, int pid, unsigned long addr,
if ((addr & 3) || (index > PT_FPSCR32))
break;
if (index == PT_ORIG_R3)
break;
if (index < PT_FPR0) {
ret = ptrace_put_reg(child, index, data);
} else {
@@ -302,24 +302,25 @@ long compat_sys_ptrace(int request, int pid, unsigned long addr,
/* Determine which register the user wants */
index = (u64)addr >> 2;
numReg = index / 2;
/*
* Validate the input - check to see if address is on the
* wrong boundary or beyond the end of the user area
*/
if ((addr & 3) || (numReg > PT_FPSCR))
break;
/* Insure it is a register we let them change */
if ((numReg == PT_ORIG_R3)
|| ((numReg > PT_CCR) && (numReg < PT_FPR0)))
break;
if (numReg >= PT_FPR0) {
if (numReg < PT_FPR0) {
unsigned long freg = ptrace_get_reg(child, numReg);
if (index % 2)
freg = (freg & ~0xfffffffful) | (data & 0xfffffffful);
else
freg = (freg & 0xfffffffful) | (data << 32);
ret = ptrace_put_reg(child, numReg, freg);
} else {
flush_fp_to_thread(child);
((unsigned int *)child->thread.regs)[index] = data;
ret = 0;
}
if (numReg == PT_MSR)
data = (data & MSR_DEBUGCHANGE)
| (child->thread.regs->msr & ~MSR_DEBUGCHANGE);
((u32*)child->thread.regs)[index] = data;
ret = 0;
break;
}