[Bug 1918302] Re: qemu-system-arm segfaults while servicing SYS_HEAPINFO

[Alex Bennée]

Testing with:

Subject: [PATCH  v5 0/5] semihosting/next (SYS_HEAPINFO)
Date: Fri, 12 Mar 2021 10:20:24 +0000
Message-Id: <20210312102029.17017-1-alex.bennee@linaro.org>

it doesn't seem to segfault QEMU anymore although the guest itself hangs
which probably means it's not happy with the numbers it got.

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https://bugs.launchpad.net/bugs/1918302

Title:
  qemu-system-arm segfaults while servicing SYS_HEAPINFO

Status in QEMU:
  In Progress

Bug description:
  I compiled QEMU version 5.2.0 from source on Ubuntu 18.04, and tried
  to use it to run the attached bare-metal Arm hello-world image, using
  the command line

  qemu-system-arm -M microbit -semihosting -nographic -device
  loader,file=hello.hex

  The result was that qemu-system-arm itself died of a segfault.
  Compiling it for debugging, the location of the segfault was in
  target/arm/arm-semi.c, in the case handler for the semihosting call
  TARGET_SYS_HEAPINFO, on line 1020 which assigns to 'rambase':

              const struct arm_boot_info *info = env->boot_info;
              target_ulong rambase = info->loader_start;

  and the problem seems to be that 'info', aka env->boot_info, is NULL
  in this context.

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