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--- developers:env_emul [2019/04/10 22:07]
mick [Running Linux on QEMU]
+++ developers:env_emul [2019/04/12 19:16]
mick [Running Linux on QEMU]
@@ Line 20: / Line 20: @@
 <code>
-<qemu install dir>/bin/qemu-system-riscv64 -nographic -machine virt -smp 8 -m 2G \
+<qemu install dir>/bin/qemu-system-riscv64 -nographic -machine virt -smp <number of cores> -m <X>G -s \
 				-bios <path to bbl or fw_jump.elf (in case of OpenSBI)> \
 				-kernel <linux sources dir>/vmlinux \
@@ Line 32: / Line 32: @@
 In case you built bbl or OpenSBI with the Linux kernel as its payload you can omit the ''-bios'' parameter and point the ''-kernel'' parameter directly to the combined bbl / fw_payload.elf binary.
 </WRAP>
+=== Debugging with QEMU ===
+With the ''-s'' option, QEMU allows a remote gdb session, to debug the running system. You may connect to the debugging session through gdb by typing ''target remote localhost:1234'', here is an example debug session:
+<code>
+mick@trampakoulas ~/kexec/kexec-tools $ riscv64-unknown-linux-gnu-gdb
+GNU gdb (GDB) 8.2.50.20181127-git
+Copyright (C) 2018 Free Software Foundation, Inc.
+License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
+This is free software: you are free to change and redistribute it.
+There is NO WARRANTY, to the extent permitted by law.
+Type "show copying" and "show warranty" for details.
+This GDB was configured as "--host=x86_64-pc-linux-gnu --target=riscv64-unknown-linux-gnu".
+Type "show configuration" for configuration details.
+For bug reporting instructions, please see:
+<http://www.gnu.org/software/gdb/bugs/>.
+Find the GDB manual and other documentation resources online at:
+    <http://www.gnu.org/software/gdb/documentation/>.
+For help, type "help".
+Type "apropos word" to search for commands related to "word".
+(gdb) target remote localhost:1234
+Remote debugging using localhost:1234
+warning: No executable has been specified and target does not support
+determining executable automatically.  Try using the "file" command.
+xffffffffb8916080 in ?? ()
+(gdb) i r
+ra             0xffffffff80033f4c	0xffffffff80033f4c
+sp             0xffffffffbadd3d60	0xffffffffbadd3d60
+gp             0xffffffff807a7b58	0xffffffff807a7b58
+tp             0xffffffffb883b480	0xffffffffb883b480
+t0             0xbafd5002	3137163266
+t1             0x2	2
+t2             0x0	0
+fp             0xbafd5000	0xbafd5000
+s1             0x80200000	2149580800
+a0             0x6	6
+a1             0x0	0
+a2             0x0	0
+a3             0x0	0
+a4             0xffffffff80765578	-2139728520
+a5             0xffffffff80765578	-2139728520
+a6             0x78	120
+a7             0x2e	46
+s2             0x809f8000	2157936640
+s3             0x0	0
+s4             0x0	0
+s5             0x200	512
+s6             0x1	1
+s7             0xfffffffeffe00000	-4297064448
+s8             0xb8b16058	3098632280
+s9             0x2	2
+s10            0x1	1
+s11            0x0	0
+t3             0x1e108	123144
+t4             0x1e108	123144
+t5             0x0	0
+t6             0xffffffff807b3465	-2139409307
+pc             0xffffffffb8916080	0xffffffffb8916080
+(gdb) q
+A debugging session is active.
+	Inferior 1 [Remote target] will be detached.
+Quit anyway? (y or n) y
+Detaching from program: , Remote target
+Ending remote debugging.
+[Inferior 1 (Remote target) detached]
+</code>

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