.gitignore

c

README.md

Output:

$ make
qemu-riscv64 -g 31337 ./c &
riscv64-unknown-linux-gnu-gdb -q \
        -ex 'target remote localhost:31337' \
        -ex 'b abort_me' -ex c -ex bt \
        -ex c -ex bt \
        -ex quit \
        c
Reading symbols from c...
Remote debugging using localhost:31337
Reading symbols from /home/lewurm/riscv/sysroot/lib/ld-linux-riscv64-lp64d.so.1...
0x0000004000804f30 in _start () from /home/lewurm/riscv/sysroot/lib/ld-linux-riscv64-lp64d.so.1
Breakpoint 1 at 0x4000000632: file c.c, line 7.
Continuing.

Breakpoint 1, abort_me () at c.c:7
7               abort(); /* trigger SIGABRT */
#0  abort_me () at c.c:7
#1  0x0000004000000642 in level1 () at c.c:11
#2  0x0000004000000658 in level2 () at c.c:15
#3  0x000000400000066e in level3 () at c.c:19
#4  0x0000004000000684 in level4 () at c.c:23
#5  0x000000400000069a in main () at c.c:27
Continuing.

Program received signal SIGABRT, Aborted.
0x0000004000858074 in ?? ()
#0  0x0000004000858074 in ?? ()
A debugging session is active.

        Inferior 1 [process 1] will be killed.

Quit anyway? (y or n)

Versions

$ qemu-riscv64 --version
qemu-riscv64 version 4.2.0 (Debian 1:4.2-3ubuntu6.3)
Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers

$ riscv64-linux-gnu-gcc --version
riscv64-linux-gnu-gcc (Ubuntu 9.3.0-10ubuntu1) 9.3.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ riscv64-unknown-linux-gnu-gdb --version
GNU gdb (GDB) 9.1
Copyright (C) 2020 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.

I also tried a build from qemu master:

$ ~/qemu/build/riscv64-linux-user/qemu-riscv64 --version
qemu-riscv64 version 5.0.91 (v5.1.0-rc1-122-g0c4fa5bc1a-dirty)

GDB was built from:

$ git remote -v
origin  git@github.com:riscv/riscv-gnu-toolchain.git (fetch)
origin  git@github.com:riscv/riscv-gnu-toolchain.git (push)

$ git submodule status
 57dfc2c4d51e770ed3f617e5d1456d1e2bacf3f0 qemu (v4.0.0-1854-g57dfc2c4d5)
 d7f734bc7e9e5fb6c33b433973b57e1eed3a7e9f riscv-binutils (heads/riscv-binutils-2.34)
 4ea498a8e1fafeb568530d84db1880066478c86b riscv-dejagnu (heads/riscv-dejagnu-1.6)
 22b1bd36b05772863fd55d4056dbc739ff591942 riscv-gcc (remotes/origin/master-883-g22b1bd36b05)
 fec47beb8a1f0a6c4a6b0c548cded5711d0c27da riscv-gdb (remotes/origin/fsf-gdb-9.1-with-sim)
 7395b0964db9cc4dd544926414960e9a16842180 riscv-glibc (heads/riscv-glibc-2.29)
 f289cef6be67da67b2d97a47d6576fa7e6b4c858 riscv-newlib (newlib-3.2.0-1-gf289cef6b)

c.c

#include <stdio.h>
#include <stdlib.h>

#define NOINLINE __attribute__ ((noinline))

void NOINLINE abort_me(void) {
	abort(); /* trigger SIGABRT */
}

void NOINLINE level1(void) {
	abort_me();
}

void NOINLINE level2(void) {
	level1();
}

void NOINLINE level3(void) {
	level2();
}

void NOINLINE level4(void) {
	level3();
}

int main(void) {
	level4();
	return 0;
}

Makefile

CC=riscv64-linux-gnu-gcc
CFLAGS=-march=rv64imafdc -O0 -g

all: c
	qemu-riscv64 -g 31337 ./c &
	riscv64-unknown-linux-gnu-gdb -q \
		-ex 'target remote localhost:31337' \
		-ex 'b abort_me' -ex c -ex bt \
		-ex c -ex bt \
		-ex quit \
		c