gem5: trace use -ExecSymbol

Author: cirosantilli

README.adoc

@@ -7196,7 +7196,7 @@ Breakdown:
 * `25007500`: time count in some unit. Note how the microops execute at further timestamps.
 * `system.cpu`: distinguishes between CPUs when there are more than one
 * `T0`: thread number. TODO: link:https://superuser.com/questions/133082/hyper-threading-and-dual-core-whats-the-difference/995858#995858[hyperthread]? How to play with it?
-* `@start_kernel`: we are in the `start_kernel` function. Awesome feature! Implemented with libelf https://sourceforge.net/projects/elftoolchain/ copy pasted in-tree `ext/libelf`. To get raw addresses, remove the `ExecSymbol`, which is enabled by `Exec`.
+* `@start_kernel`: we are in the `start_kernel` function. Awesome feature! Implemented with libelf https://sourceforge.net/projects/elftoolchain/ copy pasted in-tree `ext/libelf`. To get raw addresses, remove the `ExecSymbol`, which is enabled by `Exec`. This can be done with `Exec,-ExecSymbol`.
 * `.1` as in `@start_kernel.1`: index of the microop
 * `stp`: instruction disassembly. Seems to use `.isa` files dispersed per arch, which is an in house format: http://gem5.org/ISA_description_system
 * `strxi_uop   x29, [ureg0]`: microop disassembly.

build-usage.adoc

@@ -26,7 +26,7 @@
                              Mnemonic: `fast`.
 |`-g` |                     |Enable gem5 build or force its rebuild.
 |`-h` |                     |Show this help message.
-|`-L` |`VARIANT`             |Linux kernel build variant.
+|`-L` |`VARIANT`            |Linux kernel build variant.
 |`-I` |                     |Enable initramfs for the current build.
 |`-i` |                     |Enable initrd for the current build.
 |`-K` |`KERNEL_CONFIG_FILE` |Use `KERNEL_CONFIG_FILE` as the exact Linux kernel

qemu

@@ -15,8 +15,7 @@ done
 shift "$(($OPTIND - 1))"
 set_common_vars "$arch" "$gem5"
 if "$gem5"; then
-  # Exactly what Exec enabled, but without ExecSymbol and ExecMicro.
-  time ./run -a aarch64 -E 'm5 exit' -g -T 'ExecEnable,ExecTicks,ExecOpClass,ExecThread,ExecEffAddr,ExecResult,ExecMacro,ExecFaulting,ExecUser,ExecKernel' "$@"
+  time ./run -a "$arch" -E 'm5 exit' -g -T 'Exec,-ExecSymbol,-ExecMicro' "$@"
 else
   time ./run -a "$arch" -e 'init=/poweroff.out' -T exec_tb "$@"
   time ./qemu-trace2txt -a "$arch"