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authorJordan Niethe <jniethe5@gmail.com>2020-05-06 06:40:31 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2020-05-18 17:10:37 +0300
commit94afd069d937d84fb4f696eb9a78db4084e43d21 (patch)
tree88f3f2fef60d56cd3b155762c378ac1fc05a5bd2 /arch/powerpc/xmon
parent217862d9b98bf08958d57fd7b31b9de0f1a9477d (diff)
downloadlinux-94afd069d937d84fb4f696eb9a78db4084e43d21.tar.xz
powerpc: Use a datatype for instructions
Currently unsigned ints are used to represent instructions on powerpc. This has worked well as instructions have always been 4 byte words. However, ISA v3.1 introduces some changes to instructions that mean this scheme will no longer work as well. This change is Prefixed Instructions. A prefixed instruction is made up of a word prefix followed by a word suffix to make an 8 byte double word instruction. No matter the endianness of the system the prefix always comes first. Prefixed instructions are only planned for powerpc64. Introduce a ppc_inst type to represent both prefixed and word instructions on powerpc64 while keeping it possible to exclusively have word instructions on powerpc32. Signed-off-by: Jordan Niethe <jniethe5@gmail.com> [mpe: Fix compile error in emulate_spe()] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200506034050.24806-12-jniethe5@gmail.com
Diffstat (limited to 'arch/powerpc/xmon')
-rw-r--r--arch/powerpc/xmon/xmon.c22
-rw-r--r--arch/powerpc/xmon/xmon_bpts.h6
2 files changed, 14 insertions, 14 deletions
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 4cf998518047..2e3b15813cf1 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -100,7 +100,7 @@ static long *xmon_fault_jmp[NR_CPUS];
/* Breakpoint stuff */
struct bpt {
unsigned long address;
- unsigned int *instr;
+ struct ppc_inst *instr;
atomic_t ref_count;
int enabled;
unsigned long pad;
@@ -876,8 +876,8 @@ static struct bpt *new_breakpoint(unsigned long a)
for (bp = bpts; bp < &bpts[NBPTS]; ++bp) {
if (!bp->enabled && atomic_read(&bp->ref_count) == 0) {
bp->address = a;
- bp->instr = bpt_table + ((bp - bpts) * BPT_WORDS);
- patch_instruction(bp->instr + 1, bpinstr);
+ bp->instr = (void *)(bpt_table + ((bp - bpts) * BPT_WORDS));
+ patch_instruction(bp->instr + 1, ppc_inst(bpinstr));
return bp;
}
}
@@ -889,7 +889,7 @@ static struct bpt *new_breakpoint(unsigned long a)
static void insert_bpts(void)
{
int i;
- unsigned int instr;
+ struct ppc_inst instr;
struct bpt *bp;
bp = bpts;
@@ -911,8 +911,8 @@ static void insert_bpts(void)
patch_instruction(bp->instr, instr);
if (bp->enabled & BP_CIABR)
continue;
- if (patch_instruction((unsigned int *)bp->address,
- bpinstr) != 0) {
+ if (patch_instruction((struct ppc_inst *)bp->address,
+ ppc_inst(bpinstr)) != 0) {
printf("Couldn't write instruction at %lx, "
"disabling breakpoint there\n", bp->address);
bp->enabled &= ~BP_TRAP;
@@ -940,7 +940,7 @@ static void remove_bpts(void)
{
int i;
struct bpt *bp;
- unsigned instr;
+ struct ppc_inst instr;
bp = bpts;
for (i = 0; i < NBPTS; ++i, ++bp) {
@@ -949,7 +949,7 @@ static void remove_bpts(void)
if (mread(bp->address, &instr, 4) == 4
&& ppc_inst_equal(instr, ppc_inst(bpinstr))
&& patch_instruction(
- (unsigned int *)bp->address, bp->instr[0]) != 0)
+ (struct ppc_inst *)bp->address, bp->instr[0]) != 0)
printf("Couldn't remove breakpoint at %lx\n",
bp->address);
}
@@ -1156,7 +1156,7 @@ static int do_step(struct pt_regs *regs)
*/
static int do_step(struct pt_regs *regs)
{
- unsigned int instr;
+ struct ppc_inst instr;
int stepped;
force_enable_xmon();
@@ -1322,7 +1322,7 @@ csum(void)
*/
static long check_bp_loc(unsigned long addr)
{
- unsigned int instr;
+ struct ppc_inst instr;
addr &= ~3;
if (!is_kernel_addr(addr)) {
@@ -2848,7 +2848,7 @@ generic_inst_dump(unsigned long adr, long count, int praddr,
{
int nr, dotted;
unsigned long first_adr;
- unsigned int inst, last_inst = ppc_inst(0);
+ struct ppc_inst inst, last_inst = ppc_inst(0);
unsigned char val[4];
dotted = 0;
diff --git a/arch/powerpc/xmon/xmon_bpts.h b/arch/powerpc/xmon/xmon_bpts.h
index b7e94375db86..57e6fb03de48 100644
--- a/arch/powerpc/xmon/xmon_bpts.h
+++ b/arch/powerpc/xmon/xmon_bpts.h
@@ -4,11 +4,11 @@
#define NBPTS 256
#ifndef __ASSEMBLY__
-#define BPT_SIZE (sizeof(unsigned int) * 2)
-#define BPT_WORDS (BPT_SIZE / sizeof(unsigned int))
+#include <asm/inst.h>
+#define BPT_SIZE (sizeof(struct ppc_inst) * 2)
+#define BPT_WORDS (BPT_SIZE / sizeof(struct ppc_inst))
extern unsigned int bpt_table[NBPTS * BPT_WORDS];
-
#endif /* __ASSEMBLY__ */
#endif /* XMON_BPTS_H */