The following fails: $ cat test.c typedef void __attribute__((cmse_nonsecure_call)) t(void); t g; void f() { g(); } $ ./arm-eabi-gcc -c test.c -mcmse -march=armv8.1-m.main -mfloat-abi=soft test.c: In function 'f': test.c:5:1: error: unrecognizable insn: 5 | } | ^ (call_insn 5 2 0 2 (parallel [ (call (unspec:SI [ (mem:SI (symbol_ref:SI ("g") [flags 0x41] <function_decl 0x7ffff7059f00 g>) [0 g S4 A32]) ] UNSPEC_NONSECURE_MEM) (const_int 0 [0])) (use (const_int 0 [0])) (clobber (reg:SI 14 lr)) ]) "test.c":4:3 -1 (nil) (nil)) during RTL pass: vregs test.c:5:1: internal compiler error: in extract_insn, at recog.c:2770 0xcc2347 _fatal_insn(char const*, rtx_def const*, char const*, int, char const*) /home/alecop01/toolchain/src/gcc/gcc/rtl-error.c:108 0xcc2366 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*) /home/alecop01/toolchain/src/gcc/gcc/rtl-error.c:116 0xc90fa6 extract_insn(rtx_insn*) /home/alecop01/toolchain/src/gcc/gcc/recog.c:2770 0x9b74e4 instantiate_virtual_regs_in_insn /home/alecop01/toolchain/src/gcc/gcc/function.c:1658 0x9b74e4 instantiate_virtual_regs /home/alecop01/toolchain/src/gcc/gcc/function.c:1983 0x9b74e4 execute /home/alecop01/toolchain/src/gcc/gcc/function.c:2032 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <https://gcc.gnu.org/bugs/> for instructions. The ICE does not occur if I instead specify -march=armv8-m.main.
Taking a look at this.
The master branch has been updated by Alex Coplan <acoplan@gcc.gnu.org>: https://gcc.gnu.org/g:5b953740da1976d90d974055c6d825c509c6e654 commit r12-923-g5b953740da1976d90d974055c6d825c509c6e654 Author: Alex Coplan <alex.coplan@arm.com> Date: Wed May 19 15:52:45 2021 +0100 arm: Fix ICE with CMSE nonsecure calls on Armv8.1-M [PR100333] As the PR shows, we ICE shortly after expanding nonsecure calls for Armv8.1-M. For Armv8.1-M, we have TARGET_HAVE_FPCXT_CMSE. As it stands, the expander (arm.md:nonsecure_call_internal) moves the callee's address to a register (with copy_to_suggested_reg) only if !TARGET_HAVE_FPCXT_CMSE. However, looking at the pattern which the insn appears to be intended to match (thumb2.md:*nonsecure_call_reg_thumb2_fpcxt), it requires the callee's address to be in a register. This patch therefore just forces the callee's address into a register in the expander. gcc/ChangeLog: PR target/100333 * config/arm/arm.md (nonsecure_call_internal): Always ensure callee's address is in a register. gcc/testsuite/ChangeLog: PR target/100333 * gcc.target/arm/cmse/pr100333.c: New test.
Fixed on trunk for now.
The releases/gcc-11 branch has been updated by Alex Coplan <acoplan@gcc.gnu.org>: https://gcc.gnu.org/g:e58539d965059994ebac606ae7533e857bbe199f commit r11-8506-ge58539d965059994ebac606ae7533e857bbe199f Author: Alex Coplan <alex.coplan@arm.com> Date: Wed May 19 15:52:45 2021 +0100 arm: Fix ICE with CMSE nonsecure calls on Armv8.1-M [PR100333] As the PR shows, we ICE shortly after expanding nonsecure calls for Armv8.1-M. For Armv8.1-M, we have TARGET_HAVE_FPCXT_CMSE. As it stands, the expander (arm.md:nonsecure_call_internal) moves the callee's address to a register (with copy_to_suggested_reg) only if !TARGET_HAVE_FPCXT_CMSE. However, looking at the pattern which the insn appears to be intended to match (thumb2.md:*nonsecure_call_reg_thumb2_fpcxt), it requires the callee's address to be in a register. This patch therefore just forces the callee's address into a register in the expander. gcc/ChangeLog: PR target/100333 * config/arm/arm.md (nonsecure_call_internal): Always ensure callee's address is in a register. gcc/testsuite/ChangeLog: PR target/100333 * gcc.target/arm/cmse/pr100333.c: New test. (cherry picked from commit 5b953740da1976d90d974055c6d825c509c6e654)
The releases/gcc-10 branch has been updated by Alex Coplan <acoplan@gcc.gnu.org>: https://gcc.gnu.org/g:fe28b9da8f81c678bf5807eba413fae09ac36e72 commit r10-9889-gfe28b9da8f81c678bf5807eba413fae09ac36e72 Author: Alex Coplan <alex.coplan@arm.com> Date: Wed May 19 15:52:45 2021 +0100 arm: Fix ICE with CMSE nonsecure calls on Armv8.1-M [PR100333] As the PR shows, we ICE shortly after expanding nonsecure calls for Armv8.1-M. For Armv8.1-M, we have TARGET_HAVE_FPCXT_CMSE. As it stands, the expander (arm.md:nonsecure_call_internal) moves the callee's address to a register (with copy_to_suggested_reg) only if !TARGET_HAVE_FPCXT_CMSE. However, looking at the pattern which the insn appears to be intended to match (thumb2.md:*nonsecure_call_reg_thumb2_fpcxt), it requires the callee's address to be in a register. This patch therefore just forces the callee's address into a register in the expander. gcc/ChangeLog: PR target/100333 * config/arm/arm.md (nonsecure_call_internal): Always ensure callee's address is in a register. gcc/testsuite/ChangeLog: PR target/100333 * gcc.target/arm/cmse/pr100333.c: New test. (cherry picked from commit 5b953740da1976d90d974055c6d825c509c6e654)
Fixed.