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powerpc/xmon: Use a function for reading instructions 

Currently in xmon, mread() is used for reading instructions. In
preparation for prefixed instructions, create and use a new function,
mread_instr(), especially for reading instructions.

Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Alistair Popple <alistair@popple.id.au>
Link: https://lore.kernel.org/r/20200506034050.24806-19-jniethe5@gmail.com
This commit is contained in:
Jordan Niethe 2020-05-06 13:40:38 +10:00 committed by Michael Ellerman
parent 622cf6f436
commit 6c7a4f0a9f
1 changed files with 24 additions and 4 deletions
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28
arch/powerpc/xmon/xmon.c
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@ -122,6 +122,7 @@ static unsigned bpinstr = 0x7fe00008; /* trap */
static int cmds(struct pt_regs *);
static int mread(unsigned long, void *, int);
static int mwrite(unsigned long, void *, int);
static int mread_instr(unsigned long, struct ppc_inst *);
static int handle_fault(struct pt_regs *);
static void byterev(unsigned char *, int);
static void memex(void);
@ -896,7 +897,7 @@ static void insert_bpts(void)
for (i = 0; i < NBPTS; ++i, ++bp) {
if ((bp->enabled & (BP_TRAP|BP_CIABR)) == 0)
continue;
if (mread(bp->address, &instr, 4) != 4) {
if (!mread_instr(bp->address, &instr)) {
printf("Couldn't read instruction at %lx, "
"disabling breakpoint there\n", bp->address);
bp->enabled = 0;
@ -946,7 +947,7 @@ static void remove_bpts(void)
for (i = 0; i < NBPTS; ++i, ++bp) {
if ((bp->enabled & (BP_TRAP|BP_CIABR)) != BP_TRAP)
continue;
if (mread(bp->address, &instr, 4) == 4
if (mread_instr(bp->address, &instr)
&& ppc_inst_equal(instr, ppc_inst(bpinstr))
&& patch_instruction(
(struct ppc_inst *)bp->address, ppc_inst_read(bp->instr)) != 0)
@ -1162,7 +1163,7 @@ static int do_step(struct pt_regs *regs)
force_enable_xmon();
/* check we are in 64-bit kernel mode, translation enabled */
if ((regs->msr & (MSR_64BIT|MSR_PR|MSR_IR)) == (MSR_64BIT|MSR_IR)) {
if (mread(regs->nip, &instr, 4) == 4) {
if (mread_instr(regs->nip, &instr)) {
stepped = emulate_step(regs, instr);
if (stepped < 0) {
printf("Couldn't single-step %s instruction\n",
@ -1329,7 +1330,7 @@ static long check_bp_loc(unsigned long addr)
printf("Breakpoints may only be placed at kernel addresses\n");
return 0;
}
if (!mread(addr, &instr, sizeof(instr))) {
if (!mread_instr(addr, &instr)) {
printf("Can't read instruction at address %lx\n", addr);
return 0;
}
@ -2122,6 +2123,25 @@ mwrite(unsigned long adrs, void *buf, int size)
return n;
}
static int
mread_instr(unsigned long adrs, struct ppc_inst *instr)
{
volatile int n;
n = 0;
if (setjmp(bus_error_jmp) == 0) {
catch_memory_errors = 1;
sync();
*instr = ppc_inst_read((struct ppc_inst *)adrs);
sync();
/* wait a little while to see if we get a machine check */
__delay(200);
n = ppc_inst_len(*instr);
}
catch_memory_errors = 0;
return n;
}
static int fault_type;
static int fault_except;
static char *fault_chars[] = { "--", "**", "##" };