changeset ab19693da8c9 in /z/repo/gem5
details: http://repo.gem5.org/gem5?cmd=changeset;node=ab19693da8c9
description:
pseudo inst,util: Add optional key to initparam pseudo instruction
The key parameter can be used to read out various config parameters from
within the simulated software.
diffstat:
src/arch/alpha/isa/decoder.isa | 2 +-
src/arch/arm/isa/insts/m5ops.isa | 5 ++-
src/arch/x86/isa/decoder/two_byte_opcodes.isa | 2 +-
src/sim/pseudo_inst.cc | 36 ++++++++++++++++++++++++---
src/sim/pseudo_inst.hh | 2 +-
util/m5/m5.c | 31 ++++++++++++++++++++---
util/m5/m5op.h | 2 +-
7 files changed, 66 insertions(+), 14 deletions(-)
diffs (191 lines):
diff -r 57c340f947c7 -r ab19693da8c9 src/arch/alpha/isa/decoder.isa
--- a/src/arch/alpha/isa/decoder.isa Thu Dec 31 09:32:09 2015 -0800
+++ b/src/arch/alpha/isa/decoder.isa Thu Jan 07 16:33:47 2016 -0600
@@ -982,7 +982,7 @@
PseudoInst::loadsymbol(xc->tcBase());
}}, No_OpClass, IsNonSpeculative);
0x30: initparam({{
- Ra = PseudoInst::initParam(xc->tcBase());
+ Ra = PseudoInst::initParam(xc->tcBase(), R16, R17);
}});
0x40: resetstats({{
PseudoInst::resetstats(xc->tcBase(), R16, R17);
diff -r 57c340f947c7 -r ab19693da8c9 src/arch/arm/isa/insts/m5ops.isa
--- a/src/arch/arm/isa/insts/m5ops.isa Thu Dec 31 09:32:09 2015 -0800
+++ b/src/arch/arm/isa/insts/m5ops.isa Thu Jan 07 16:33:47 2016 -0600
@@ -276,13 +276,14 @@
exec_output += PredOpExecute.subst(loadsymbolIop)
initparamCode = '''
- uint64_t ip_val = PseudoInst::initParam(xc->tcBase());
+ uint64_t ip_val = PseudoInst::initParam(xc->tcBase(), join32to64(R1, R0),
+ join32to64(R3, R2));
R0 = bits(ip_val, 31, 0);
R1 = bits(ip_val, 63, 32);
'''
initparamCode64 = '''
- X0 = PseudoInst::initParam(xc->tcBase());
+ X0 = PseudoInst::initParam(xc->tcBase(), X0, X1);
'''
initparamIop = InstObjParams("initparam", "Initparam", "PredOp",
diff -r 57c340f947c7 -r ab19693da8c9
src/arch/x86/isa/decoder/two_byte_opcodes.isa
--- a/src/arch/x86/isa/decoder/two_byte_opcodes.isa Thu Dec 31 09:32:09
2015 -0800
+++ b/src/arch/x86/isa/decoder/two_byte_opcodes.isa Thu Jan 07 16:33:47
2016 -0600
@@ -173,7 +173,7 @@
PseudoInst::m5fail(xc->tcBase(), Rdi, Rsi);
}}, IsNonSpeculative);
0x30: m5initparam({{
- Rax = PseudoInst::initParam(xc->tcBase());
+ Rax = PseudoInst::initParam(xc->tcBase(), Rdi, Rsi);
}}, IsNonSpeculative);
0x31: m5loadsymbol({{
PseudoInst::loadsymbol(xc->tcBase());
diff -r 57c340f947c7 -r ab19693da8c9 src/sim/pseudo_inst.cc
--- a/src/sim/pseudo_inst.cc Thu Dec 31 09:32:09 2015 -0800
+++ b/src/sim/pseudo_inst.cc Thu Jan 07 16:33:47 2016 -0600
@@ -141,7 +141,7 @@
break;
case 0x30: // initparam_func
- return initParam(tc);
+ return initParam(tc, args[0], args[1]);
case 0x31: // loadsymbol_func
loadsymbol(tc);
@@ -440,15 +440,43 @@
}
uint64_t
-initParam(ThreadContext *tc)
+initParam(ThreadContext *tc, uint64_t key_str1, uint64_t key_str2)
{
- DPRINTF(PseudoInst, "PseudoInst::initParam()\n");
+ DPRINTF(PseudoInst, "PseudoInst::initParam() key:%s%s\n", (char
*)&key_str1,
+ (char *)&key_str2);
if (!FullSystem) {
panicFsOnlyPseudoInst("initParam");
return 0;
}
- return tc->getCpuPtr()->system->init_param;
+ // The key parameter string is passed in via two 64-bit registers. We copy
+ // out the characters from the 64-bit integer variables here and
concatenate
+ // them in the key_str character buffer
+ const int len = 2 * sizeof(uint64_t) + 1;
+ char key_str[len];
+ memset(key_str, '\0', len);
+ if (key_str1 == 0) {
+ assert(key_str2 == 0);
+ } else {
+ strncpy(key_str, (char *)&key_str1, sizeof(uint64_t));
+ }
+
+ if (strlen(key_str) == sizeof(uint64_t)) {
+ strncpy(key_str + sizeof(uint64_t), (char *)&key_str2,
+ sizeof(uint64_t));
+ } else {
+ assert(key_str2 == 0);
+ }
+
+ // Compare the key parameter with the known values to select the return
+ // value
+ uint64_t val;
+ if (strlen(key_str) == 0) {
+ val = tc->getCpuPtr()->system->init_param;
+ } else {
+ panic("Unknown key for initparam pseudo instruction");
+ }
+ return val;
}
diff -r 57c340f947c7 -r ab19693da8c9 src/sim/pseudo_inst.hh
--- a/src/sim/pseudo_inst.hh Thu Dec 31 09:32:09 2015 -0800
+++ b/src/sim/pseudo_inst.hh Thu Jan 07 16:33:47 2016 -0600
@@ -75,7 +75,7 @@
uint64_t offset, Addr filenameAddr);
void loadsymbol(ThreadContext *xc);
void addsymbol(ThreadContext *tc, Addr addr, Addr symbolAddr);
-uint64_t initParam(ThreadContext *xc);
+uint64_t initParam(ThreadContext *xc, uint64_t key_str1, uint64_t key_str2);
uint64_t rpns(ThreadContext *tc);
void wakeCPU(ThreadContext *tc, uint64_t cpuid);
void m5exit(ThreadContext *tc, Tick delay);
diff -r 57c340f947c7 -r ab19693da8c9 util/m5/m5.c
--- a/util/m5/m5.c Thu Dec 31 09:32:09 2015 -0800
+++ b/util/m5/m5.c Thu Jan 07 16:33:47 2016 -0600
@@ -83,6 +83,27 @@
#undef strto64
}
+void
+parse_str_args_to_regs(int argc, char *argv[], uint64_t regs[], int len)
+{
+ if (argc > 1 || strlen(argv[0]) > len * sizeof(uint64_t))
+ usage();
+
+ int i;
+ for (i = 0; i < len; i++)
+ regs[i] = 0;
+
+ if (argc == 0)
+ return;
+
+ int n;
+ for (n = 0, i = 0; i < len && n < strlen(argv[0]); n++) {
+ *((char *)(®s[i]) + (n % 8)) = argv[0][n];
+ if ((n % 8) == 7)
+ i++;
+ }
+}
+
int
read_file(int dest_fid)
{
@@ -233,10 +254,12 @@
void
do_initparam(int argc, char *argv[])
{
- if (argc != 0)
+ if (argc > 1)
usage();
- uint64_t val = m5_initparam();
+ uint64_t key_str[2];
+ parse_str_args_to_regs(argc, argv, key_str, 2);
+ uint64_t val = m5_initparam(key_str[0], key_str[1]);
printf("%"PRIu64, val);
}
@@ -246,7 +269,7 @@
if (argc != 0)
usage();
- uint64_t param = m5_initparam();
+ uint64_t param = m5_initparam(0, 0);
// run-time, rampup-time, rampdown-time, warmup-time, connections
printf("%"PRId64" %"PRId64" %"PRId64" %"PRId64" %"PRId64,
@@ -298,7 +321,7 @@
{ "execfile", do_exec_file, "" },
{ "checkpoint", do_checkpoint, "[delay [period]]" },
{ "loadsymbol", do_load_symbol, "<address> <symbol>" },
- { "initparam", do_initparam, "" },
+ { "initparam", do_initparam, "[key] // key must be shorter
than 16 chars" },
{ "sw99param", do_sw99param, "" },
#ifdef linux
{ "pin", do_pin, "<cpu> <program> [args ...]" }
diff -r 57c340f947c7 -r ab19693da8c9 util/m5/m5op.h
--- a/util/m5/m5op.h Thu Dec 31 09:32:09 2015 -0800
+++ b/util/m5/m5op.h Thu Jan 07 16:33:47 2016 -0600
@@ -48,7 +48,7 @@
void m5_exit(uint64_t ns_delay);
void m5_fail(uint64_t ns_delay, uint64_t code);
-uint64_t m5_initparam(void);
+uint64_t m5_initparam(uint64_t key_str1, uint64_t key_str2);
void m5_checkpoint(uint64_t ns_delay, uint64_t ns_period);
void m5_reset_stats(uint64_t ns_delay, uint64_t ns_period);
void m5_dump_stats(uint64_t ns_delay, uint64_t ns_period);
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