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authorPaul Mackerras <paulus@ozlabs.org>2016-04-13 21:31:24 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2016-05-11 21:54:07 +1000
commit31cdd0c39c7544ced79da53aa0b7e989f3a39582 (patch)
treea867018ed54a6b51784a0fde4b42faaf551ac889 /arch/powerpc/xmon
parentf47822078dece7189cad0a5f472f148e5e916736 (diff)
powerpc/xmon: Fix SPR read/write commands and add command to dump SPRs
xmon has commands for reading and writing SPRs, but they don't work currently for several reasons. They attempt to synthesize a small function containing an mfspr or mtspr instruction and call it. However, the instructions are on the stack, which is usually not executable. Also, for 64-bit we set up a procedure descriptor, which is fine for the big-endian ABIv1, but not correct for ABIv2. Finally, the code uses the infrastructure for catching memory errors, but that only catches data storage interrupts and machine check interrupts, but a failed mfspr/mtspr can generate a program interrupt or a hypervisor emulation assist interrupt, or be a no-op. Instead of trying to synthesize a function on the fly, this adds two new functions, xmon_mfspr() and xmon_mtspr(), which take an SPR number as an argument and read or write the SPR. Because there is no Power ISA instruction which takes an SPR number in a register, we have to generate one of each possible mfspr and mtspr instruction, for all 1024 possible SPRs. Thus we get just over 8k bytes of code for each of xmon_mfspr() and xmon_mtspr(). However, this 16kB of code pales in comparison to the > 130kB of PPC opcode tables used by the xmon disassembler. To catch interrupts caused by the mfspr/mtspr instructions, we add a new 'catch_spr_faults' flag. If an interrupt occurs while it is set, we come back into xmon() via program_check_interrupt(), _exception() and die(), see that catch_spr_faults is set and do a longjmp to bus_error_jmp, back into read_spr() or write_spr(). This adds a couple of other nice features: first, a "Sa" command that attempts to read and print out the value of all 1024 SPRs. If any mfspr instruction acts as a no-op, then the SPR is not implemented and not printed. Secondly, the Sr and Sw commands detect when an SPR is not implemented (i.e. mfspr is a no-op) and print a message to that effect rather than printing a bogus value. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/xmon')
-rw-r--r--arch/powerpc/xmon/Makefile2
-rw-r--r--arch/powerpc/xmon/spr_access.S45
-rw-r--r--arch/powerpc/xmon/xmon.c136
3 files changed, 122 insertions, 61 deletions
diff --git a/arch/powerpc/xmon/Makefile b/arch/powerpc/xmon/Makefile
index 436062dbb6e2..0b2f771593eb 100644
--- a/arch/powerpc/xmon/Makefile
+++ b/arch/powerpc/xmon/Makefile
@@ -7,7 +7,7 @@ UBSAN_SANITIZE := n
ccflags-$(CONFIG_PPC64) := $(NO_MINIMAL_TOC)
-obj-y += xmon.o nonstdio.o
+obj-y += xmon.o nonstdio.o spr_access.o
ifdef CONFIG_XMON_DISASSEMBLY
obj-y += ppc-dis.o ppc-opc.o
diff --git a/arch/powerpc/xmon/spr_access.S b/arch/powerpc/xmon/spr_access.S
new file mode 100644
index 000000000000..84ad74213c83
--- /dev/null
+++ b/arch/powerpc/xmon/spr_access.S
@@ -0,0 +1,45 @@
+#include <asm/ppc_asm.h>
+
+/* unsigned long xmon_mfspr(sprn, default_value) */
+_GLOBAL(xmon_mfspr)
+ ld r5, .Lmfspr_table@got(r2)
+ b xmon_mxspr
+
+/* void xmon_mtspr(sprn, new_value) */
+_GLOBAL(xmon_mtspr)
+ ld r5, .Lmtspr_table@got(r2)
+ b xmon_mxspr
+
+/*
+ * r3 = sprn
+ * r4 = default or new value
+ * r5 = table base
+ */
+xmon_mxspr:
+ /*
+ * To index into the table of mxsprs we need:
+ * i = (sprn & 0x3ff) * 8
+ * or using rwlinm:
+ * i = (sprn << 3) & (0x3ff << 3)
+ */
+ rlwinm r3, r3, 3, 0x3ff << 3
+ add r5, r5, r3
+ mtctr r5
+ mr r3, r4 /* put default_value in r3 for mfspr */
+ bctr
+
+.Lmfspr_table:
+ spr = 0
+ .rept 1024
+ mfspr r3, spr
+ blr
+ spr = spr + 1
+ .endr
+
+.Lmtspr_table:
+ spr = 0
+ .rept 1024
+ mtspr spr, r4
+ blr
+ spr = spr + 1
+ .endr
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 308283b7b60c..c5e155108be5 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -86,6 +86,7 @@ static char tmpstr[128];
static long bus_error_jmp[JMP_BUF_LEN];
static int catch_memory_errors;
+static int catch_spr_faults;
static long *xmon_fault_jmp[NR_CPUS];
/* Breakpoint stuff */
@@ -147,7 +148,7 @@ void getstring(char *, int);
static void flush_input(void);
static int inchar(void);
static void take_input(char *);
-static unsigned long read_spr(int);
+static int read_spr(int, unsigned long *);
static void write_spr(int, unsigned long);
static void super_regs(void);
static void remove_bpts(void);
@@ -250,6 +251,9 @@ Commands:\n\
sdi # disassemble spu local store for spu # (in hex)\n"
#endif
" S print special registers\n\
+ Sa print all SPRs\n\
+ Sr # read SPR #\n\
+ Sw #v write v to SPR #\n\
t print backtrace\n\
x exit monitor and recover\n\
X exit monitor and don't recover\n"
@@ -442,6 +446,12 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
#ifdef CONFIG_SMP
cpu = smp_processor_id();
if (cpumask_test_cpu(cpu, &cpus_in_xmon)) {
+ /*
+ * We catch SPR read/write faults here because the 0x700, 0xf60
+ * etc. handlers don't call debugger_fault_handler().
+ */
+ if (catch_spr_faults)
+ longjmp(bus_error_jmp, 1);
get_output_lock();
excprint(regs);
printf("cpu 0x%x: Exception %lx %s in xmon, "
@@ -1635,89 +1645,87 @@ static void cacheflush(void)
catch_memory_errors = 0;
}
-static unsigned long
-read_spr(int n)
+extern unsigned long xmon_mfspr(int spr, unsigned long default_value);
+extern void xmon_mtspr(int spr, unsigned long value);
+
+static int
+read_spr(int n, unsigned long *vp)
{
- unsigned int instrs[2];
- unsigned long (*code)(void);
unsigned long ret = -1UL;
-#ifdef CONFIG_PPC64
- unsigned long opd[3];
-
- opd[0] = (unsigned long)instrs;
- opd[1] = 0;
- opd[2] = 0;
- code = (unsigned long (*)(void)) opd;
-#else
- code = (unsigned long (*)(void)) instrs;
-#endif
-
- /* mfspr r3,n; blr */
- instrs[0] = 0x7c6002a6 + ((n & 0x1F) << 16) + ((n & 0x3e0) << 6);
- instrs[1] = 0x4e800020;
- store_inst(instrs);
- store_inst(instrs+1);
+ int ok = 0;
if (setjmp(bus_error_jmp) == 0) {
- catch_memory_errors = 1;
+ catch_spr_faults = 1;
sync();
- ret = code();
+ ret = xmon_mfspr(n, *vp);
sync();
- /* wait a little while to see if we get a machine check */
- __delay(200);
- n = size;
+ *vp = ret;
+ ok = 1;
}
+ catch_spr_faults = 0;
- return ret;
+ return ok;
}
static void
write_spr(int n, unsigned long val)
{
- unsigned int instrs[2];
- unsigned long (*code)(unsigned long);
-#ifdef CONFIG_PPC64
- unsigned long opd[3];
-
- opd[0] = (unsigned long)instrs;
- opd[1] = 0;
- opd[2] = 0;
- code = (unsigned long (*)(unsigned long)) opd;
-#else
- code = (unsigned long (*)(unsigned long)) instrs;
-#endif
-
- instrs[0] = 0x7c6003a6 + ((n & 0x1F) << 16) + ((n & 0x3e0) << 6);
- instrs[1] = 0x4e800020;
- store_inst(instrs);
- store_inst(instrs+1);
-
if (setjmp(bus_error_jmp) == 0) {
- catch_memory_errors = 1;
+ catch_spr_faults = 1;
sync();
- code(val);
+ xmon_mtspr(n, val);
sync();
- /* wait a little while to see if we get a machine check */
- __delay(200);
- n = size;
+ } else {
+ printf("SPR 0x%03x (%4d) Faulted during write\n", n, n);
}
+ catch_spr_faults = 0;
}
static unsigned long regno;
extern char exc_prolog;
extern char dec_exc;
+static void dump_one_spr(int spr, bool show_unimplemented)
+{
+ unsigned long val;
+
+ val = 0xdeadbeef;
+ if (!read_spr(spr, &val)) {
+ printf("SPR 0x%03x (%4d) Faulted during read\n", spr, spr);
+ return;
+ }
+
+ if (val == 0xdeadbeef) {
+ /* Looks like read was a nop, confirm */
+ val = 0x0badcafe;
+ if (!read_spr(spr, &val)) {
+ printf("SPR 0x%03x (%4d) Faulted during read\n", spr, spr);
+ return;
+ }
+
+ if (val == 0x0badcafe) {
+ if (show_unimplemented)
+ printf("SPR 0x%03x (%4d) Unimplemented\n", spr, spr);
+ return;
+ }
+ }
+
+ printf("SPR 0x%03x (%4d) = 0x%lx\n", spr, spr, val);
+}
+
static void super_regs(void)
{
int cmd;
- unsigned long val;
+ int spr;
cmd = skipbl();
- if (cmd == '\n') {
+
+ switch (cmd) {
+ case '\n': {
unsigned long sp, toc;
asm("mr %0,1" : "=r" (sp) :);
asm("mr %0,2" : "=r" (toc) :);
@@ -1730,21 +1738,29 @@ static void super_regs(void)
mfspr(SPRN_DEC), mfspr(SPRN_SPRG2));
printf("sp = "REG" sprg3= "REG"\n", sp, mfspr(SPRN_SPRG3));
printf("toc = "REG" dar = "REG"\n", toc, mfspr(SPRN_DAR));
-
return;
}
-
- scanhex(&regno);
- switch (cmd) {
- case 'w':
- val = read_spr(regno);
+ case 'w': {
+ unsigned long val;
+ scanhex(&regno);
+ val = 0;
+ read_spr(regno, &val);
scanhex(&val);
write_spr(regno, val);
- /* fall through */
+ dump_one_spr(regno, true);
+ break;
+ }
case 'r':
- printf("spr %lx = %lx\n", regno, read_spr(regno));
+ scanhex(&regno);
+ dump_one_spr(regno, true);
+ break;
+ case 'a':
+ /* dump ALL SPRs */
+ for (spr = 1; spr < 1024; ++spr)
+ dump_one_spr(spr, false);
break;
}
+
scannl();
}