[Qemu-devel] [Bug 944753] Re: ARM: CORTEX M, PRIMASK and FAULTMASK are misplaced, WINDOWS mingw 4.6.1 bug

[Oleksiy Bondarenko]

Yes, thanks. I have mentioned that too.

About:
       but really you need to report gcc bugs to the gcc folks, not us.

I sow in source code that there are workarounds for different compilers
bugs on different platforms.

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/944753

Title:
  ARM: CORTEX M, PRIMASK and FAULTMASK are misplaced, WINDOWS mingw
  4.6.1 bug

Status in QEMU:
  New

Bug description:
  Just want to warn anyone who hacks QEMU cortex M support under MinGW,
  it seems there is a bug in gcc 4.6.1 that compiles this peace of code
  wrong.

  translate.c:

               if (IS_M(env)) {
                  tmp = tcg_const_i32((insn & (1 << 4)) != 0);
                 /* PRIMASK */
                  if (insn & 2) {
                      addr = tcg_const_i32(16);
                      gen_helper_v7m_msr(cpu_env, addr, tmp);
                      tcg_temp_free_i32(addr);
                  }
                  /* FAULTMASK */
                  if (insn & 1) {
                      addr = tcg_const_i32(17);
                      gen_helper_v7m_msr(cpu_env, addr, tmp);
                      tcg_temp_free_i32(addr);
                  }
                  tcg_temp_free_i32(tmp);
                  gen_lookup_tb(s);

  if we just switch conditions order it will compile OK

                if (IS_M(env)) {
                  tmp = tcg_const_i32((insn & (1 << 4)) != 0);
                  /* FAULTMASK */
                  if (insn & 1) {
                      addr = tcg_const_i32(17);
                      gen_helper_v7m_msr(cpu_env, addr, tmp);
                      tcg_temp_free_i32(addr);
                  }
                  /* PRIMASK */
                  if (insn & 2) {
                      addr = tcg_const_i32(16);
                      gen_helper_v7m_msr(cpu_env, addr, tmp);
                      tcg_temp_free_i32(addr);
                  }
                  tcg_temp_free_i32(tmp);
                  gen_lookup_tb(s);

  I have attached gdb disassembly in the attachment for both cases

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/944753/+subscriptions