[Bug 1915925] Re: ARM semihosting HEAPINFO results wrote to wrong address

[Peter Maydell]

Broken in commit 3c37cfe0b1e8a49, I think.

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https://bugs.launchpad.net/bugs/1915925

Title:
  ARM semihosting HEAPINFO results wrote to wrong address

Status in QEMU:
  New

Bug description:
  This affects latest development branch of QEMU.

  According to the ARM spec of the HEAPINFO semihosting call:

  https://developer.arm.com/documentation/100863/0300/Semihosting-
  operations/SYS-HEAPINFO--0x16-?lang=en

  > the PARAMETER REGISTER contains the address of a pointer to a four-
  field data block.

  However, QEMU treated the PARAMETER REGISTER as pointing to a four-
  field data block directly.

  Here is a simple program that can demonstrate this problem:
  https://github.com/iNvEr7/qemu-learn/tree/newlib-bug/semihosting-
  newlib

  This code links with newlib with semihosting mode, which will call the
  HEAPINFO SVC during crt0 routine. When running in QEMU (make run), it
  may crash the program either because of invalid write or memory
  curruption, depending on the compiled program structure.

  Also refer to my discussion with newlib folks:
  https://sourceware.org/pipermail/newlib/2021/018260.html

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