Inline assembly error: Instruction requires arm-mode

[cattokomo]

I've stumbled upon this error when building libck for Termux with clang on arm.

clang error

``` In file included from /home/builder/.termux-build/libck/src/src/ck_ec.c:1: In file included from /home/builder/.termux-build/libck/src/include/ck_ec.h:253: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:150:1: error: instruction requires: arm-mode CK_PR_DOUBLE_LOAD(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:143:19: note: expanded from macro 'CK_PR_DOUBLE_LOAD' __asm __volatile("ldrexd %0, [%1]" \ ^ :1:2: note: instantiated into assembly here ldrexd r2, [r0] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ec.c:1: In file included from /home/builder/.termux-build/libck/src/include/ck_ec.h:253: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:233:1: error: instruction requires: arm-mode CK_PR_DOUBLE_CAS_VALUE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:217:23: note: expanded from macro 'CK_PR_DOUBLE_CAS_VALUE' __asm__ __volatile__("1:" \ ^ :1:4: note: instantiated into assembly here 1:ldrexd r4, [r12];cmp r4, r2;ittt eq;cmpeq r5, r3;strexdeq r6, r0, [r12];cmpeq r6, #1;beq 1b; ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ec.c:1: In file included from /home/builder/.termux-build/libck/src/include/ck_ec.h:253: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:233:1: error: instruction requires: arm-mode CK_PR_DOUBLE_CAS_VALUE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:217:23: note: expanded from macro 'CK_PR_DOUBLE_CAS_VALUE' __asm__ __volatile__("1:" \ ^ :1:57: note: instantiated into assembly here 1:ldrexd r4, [r12];cmp r4, r2;ittt eq;cmpeq r5, r3;strexdeq r6, r0, [r12];cmpeq r6, #1;beq 1b; ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ec.c:1: In file included from /home/builder/.termux-build/libck/src/include/ck_ec.h:253: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:150:1: error: instruction requires: arm-mode CK_PR_DOUBLE_LOAD(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:143:19: note: expanded from macro 'CK_PR_DOUBLE_LOAD' __asm __volatile("ldrexd %0, [%1]" \ ^ :1:2: note: instantiated into assembly here ldrexd r2, [r10] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ec.c:1: In file included from /home/builder/.termux-build/libck/src/include/ck_ec.h:253: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:233:1: error: instruction requires: arm-mode CK_PR_DOUBLE_CAS_VALUE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:217:23: note: expanded from macro 'CK_PR_DOUBLE_CAS_VALUE' __asm__ __volatile__("1:" \ ^ :1:4: note: instantiated into assembly here 1:ldrexd r0, [r10];cmp r0, r8;ittt eq;cmpeq r1, r9;strexdeq r2, r4, [r10];cmpeq r2, #1;beq 1b; ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ec.c:1: In file included from /home/builder/.termux-build/libck/src/include/ck_ec.h:253: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:233:1: error: instruction requires: arm-mode CK_PR_DOUBLE_CAS_VALUE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:217:23: note: expanded from macro 'CK_PR_DOUBLE_CAS_VALUE' __asm__ __volatile__("1:" \ ^ :1:57: note: instantiated into assembly here 1:ldrexd r0, [r10];cmp r0, r8;ittt eq;cmpeq r1, r9;strexdeq r2, r4, [r10];cmpeq r2, #1;beq 1b; ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ec.c:1: In file included from /home/builder/.termux-build/libck/src/include/ck_ec.h:253: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:150:1: error: instruction requires: arm-mode CK_PR_DOUBLE_LOAD(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:143:19: note: expanded from macro 'CK_PR_DOUBLE_LOAD' __asm __volatile("ldrexd %0, [%1]" \ ^ :1:2: note: instantiated into assembly here ldrexd r0, [r10] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ec.c:1: In file included from /home/builder/.termux-build/libck/src/include/ck_ec.h:253: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:150:1: error: instruction requires: arm-mode CK_PR_DOUBLE_LOAD(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:143:19: note: expanded from macro 'CK_PR_DOUBLE_LOAD' __asm __volatile("ldrexd %0, [%1]" \ ^ :1:2: note: instantiated into assembly here ldrexd r8, [r0] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ec.c:1: In file included from /home/builder/.termux-build/libck/src/include/ck_ec.h:253: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:150:1: error: instruction requires: arm-mode CK_PR_DOUBLE_LOAD(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:143:19: note: expanded from macro 'CK_PR_DOUBLE_LOAD' __asm __volatile("ldrexd %0, [%1]" \ ^ :1:2: note: instantiated into assembly here ldrexd r8, [r0] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ec.c:1: In file included from /home/builder/.termux-build/libck/src/include/ck_ec.h:253: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:150:1: error: instruction requires: arm-mode CK_PR_DOUBLE_LOAD(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:143:19: note: expanded from macro 'CK_PR_DOUBLE_LOAD' __asm __volatile("ldrexd %0, [%1]" \ ^ :1:2: note: instantiated into assembly here ldrexd r4, [r6] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ec.c:1: In file included from /home/builder/.termux-build/libck/src/include/ck_ec.h:253: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:150:1: error: instruction requires: arm-mode CK_PR_DOUBLE_LOAD(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:143:19: note: expanded from macro 'CK_PR_DOUBLE_LOAD' __asm __volatile("ldrexd %0, [%1]" \ ^ :1:2: note: instantiated into assembly here ldrexd r0, [r6] ^ 11 errors generated. make[1]: *** [Makefile:34: ck_ec.o] Error 1 make[1]: *** Waiting for unfinished jobs.... In file included from /home/builder/.termux-build/libck/src/src/ck_ht.c:28: In file included from /home/builder/.termux-build/libck/src/include/ck_ht.h:30: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:203:1: error: instruction requires: arm-mode CK_PR_DOUBLE_STORE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:193:10: note: expanded from macro 'CK_PR_DOUBLE_STORE' "ldrexd %0, [%2]\n" \ ^ :2:1: note: instantiated into assembly here ldrexd r10, [r6] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ht.c:28: In file included from /home/builder/.termux-build/libck/src/include/ck_ht.h:30: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:203:1: error: instruction requires: arm-mode CK_PR_DOUBLE_STORE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:194:6: note: expanded from macro 'CK_PR_DOUBLE_STORE' "strexd %1, %3, [%2]\n" \ ^ :3:1: note: instantiated into assembly here strexd r1, r4, [r6] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ht.c:28: In file included from /home/builder/.termux-build/libck/src/include/ck_ht.h:30: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:203:1: error: instruction requires: arm-mode CK_PR_DOUBLE_STORE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:193:10: note: expanded from macro 'CK_PR_DOUBLE_STORE' "ldrexd %0, [%2]\n" \ ^ :2:1: note: instantiated into assembly here ldrexd r4, [r1] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ht.c:28: In file included from /home/builder/.termux-build/libck/src/include/ck_ht.h:30: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:203:1: error: instruction requires: arm-mode CK_PR_DOUBLE_STORE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:194:6: note: expanded from macro 'CK_PR_DOUBLE_STORE' "strexd %1, %3, [%2]\n" \ ^ :3:1: note: instantiated into assembly here strexd r3, r10, [r1] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ht.c:28: In file included from /home/builder/.termux-build/libck/src/include/ck_ht.h:30: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:203:1: error: instruction requires: arm-mode CK_PR_DOUBLE_STORE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:193:10: note: expanded from macro 'CK_PR_DOUBLE_STORE' "ldrexd %0, [%2]\n" \ ^ :2:1: note: instantiated into assembly here ldrexd r4, [r1] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ht.c:28: In file included from /home/builder/.termux-build/libck/src/include/ck_ht.h:30: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:203:1: error: instruction requires: arm-mode CK_PR_DOUBLE_STORE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:194:6: note: expanded from macro 'CK_PR_DOUBLE_STORE' "strexd %1, %3, [%2]\n" \ ^ :3:1: note: instantiated into assembly here strexd r3, r10, [r1] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ht.c:28: In file included from /home/builder/.termux-build/libck/src/include/ck_ht.h:30: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:203:1: error: instruction requires: arm-mode CK_PR_DOUBLE_STORE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:193:10: note: expanded from macro 'CK_PR_DOUBLE_STORE' "ldrexd %0, [%2]\n" \ ^ :2:1: note: instantiated into assembly here ldrexd r2, [r6] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ht.c:28: In file included from /home/builder/.termux-build/libck/src/include/ck_ht.h:30: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:203:1: error: instruction requires: arm-mode CK_PR_DOUBLE_STORE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:194:6: note: expanded from macro 'CK_PR_DOUBLE_STORE' "strexd %1, %3, [%2]\n" \ ^ :3:1: note: instantiated into assembly here strexd r1, r4, [r6] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ht.c:28: In file included from /home/builder/.termux-build/libck/src/include/ck_ht.h:30: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:203:1: error: instruction requires: arm-mode CK_PR_DOUBLE_STORE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:193:10: note: expanded from macro 'CK_PR_DOUBLE_STORE' "ldrexd %0, [%2]\n" \ ^ :2:1: note: instantiated into assembly here ldrexd r2, [r0] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ht.c:28: In file included from /home/builder/.termux-build/libck/src/include/ck_ht.h:30: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:203:1: error: instruction requires: arm-mode CK_PR_DOUBLE_STORE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:194:6: note: expanded from macro 'CK_PR_DOUBLE_STORE' "strexd %1, %3, [%2]\n" \ ^ :3:1: note: instantiated into assembly here strexd r1, r10, [r0] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ht.c:28: In file included from /home/builder/.termux-build/libck/src/include/ck_ht.h:30: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:203:1: error: instruction requires: arm-mode CK_PR_DOUBLE_STORE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:193:10: note: expanded from macro 'CK_PR_DOUBLE_STORE' "ldrexd %0, [%2]\n" \ ^ :2:1: note: instantiated into assembly here ldrexd r4, [r0] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ht.c:28: In file included from /home/builder/.termux-build/libck/src/include/ck_ht.h:30: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:203:1: error: instruction requires: arm-mode CK_PR_DOUBLE_STORE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:194:6: note: expanded from macro 'CK_PR_DOUBLE_STORE' "strexd %1, %3, [%2]\n" \ ^ :3:1: note: instantiated into assembly here strexd r1, r2, [r0] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ht.c:28: In file included from /home/builder/.termux-build/libck/src/include/ck_ht.h:30: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:150:1: error: instruction requires: arm-mode CK_PR_DOUBLE_LOAD(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:143:19: note: expanded from macro 'CK_PR_DOUBLE_LOAD' __asm __volatile("ldrexd %0, [%1]" \ ^ :1:2: note: instantiated into assembly here ldrexd r0, [r2] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ht.c:28: In file included from /home/builder/.termux-build/libck/src/include/ck_ht.h:30: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:203:1: error: instruction requires: arm-mode CK_PR_DOUBLE_STORE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:193:10: note: expanded from macro 'CK_PR_DOUBLE_STORE' "ldrexd %0, [%2]\n" \ ^ :2:1: note: instantiated into assembly here ldrexd r4, [r3] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ht.c:28: In file included from /home/builder/.termux-build/libck/src/include/ck_ht.h:30: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:203:1: error: instruction requires: arm-mode CK_PR_DOUBLE_STORE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:194:6: note: expanded from macro 'CK_PR_DOUBLE_STORE' "strexd %1, %3, [%2]\n" \ ^ :3:1: note: instantiated into assembly here strexd r1, r8, [r3] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ht.c:28: In file included from /home/builder/.termux-build/libck/src/include/ck_ht.h:30: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:203:1: error: instruction requires: arm-mode CK_PR_DOUBLE_STORE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:193:10: note: expanded from macro 'CK_PR_DOUBLE_STORE' "ldrexd %0, [%2]\n" \ ^ :2:1: note: instantiated into assembly here ldrexd r4, [r8] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ht.c:28: In file included from /home/builder/.termux-build/libck/src/include/ck_ht.h:30: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:203:1: error: instruction requires: arm-mode CK_PR_DOUBLE_STORE(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:194:6: note: expanded from macro 'CK_PR_DOUBLE_STORE' "strexd %1, %3, [%2]\n" \ ^ :3:1: note: instantiated into assembly here strexd r0, r2, [r8] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ht.c:28: In file included from /home/builder/.termux-build/libck/src/include/ck_ht.h:30: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:150:1: error: instruction requires: arm-mode CK_PR_DOUBLE_LOAD(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:143:19: note: expanded from macro 'CK_PR_DOUBLE_LOAD' __asm __volatile("ldrexd %0, [%1]" \ ^ :1:2: note: instantiated into assembly here ldrexd r2, [lr] ^ In file included from /home/builder/.termux-build/libck/src/src/ck_ht.c:28: In file included from /home/builder/.termux-build/libck/src/include/ck_ht.h:30: In file included from /home/builder/.termux-build/libck/src/include/ck_pr.h:64: /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:150:1: error: instruction requires: arm-mode CK_PR_DOUBLE_LOAD(uint64_t, 64) ^ /home/builder/.termux-build/libck/src/include/gcc/arm/ck_pr.h:143:19: note: expanded from macro 'CK_PR_DOUBLE_LOAD' __asm __volatile("ldrexd %0, [%1]" \ ^ :1:2: note: instantiated into assembly here ldrexd r0, [r6] ^ fatal error: too many errors emitted, stopping now [-ferror-limit=] 20 errors generated. ```

[cognet]

Hi @cattokomo,

After a bit of investigating, this instruction should definitely be available even when compiling for Thumb2. I suspect maybe your clang is targetting Armv7-M. What is the target provided by clang -v ?

[cattokomo]

Hello @cognet.

Here's the output of clang -v.

~ $ clang -v
clang version 18.1.7
Target: armv7a-unknown-linux-android24
Thread model: posix
InstalledDir: /data/data/com.termux/files/usr/bin

[cognet]

@cattokomo sorry for taking so long to respond, I'd like to fix that, but it sounds like a Termux-specific thing, can you help me reproduce the problem? I assume I have to install Termux on an Android device, but my phone has a 64bits arm, so it brings a 64bits compiler, and that seems to work fine here. Do you know of a way I could get access to a Termux running on 32bits arm? Thank you!

[cattokomo]

@cattokomo sorry for taking so long to respond, I'd like to fix that, but it sounds like a Termux-specific thing, can you help me reproduce the problem? I assume I have to install Termux on an Android device, but my phone has a 64bits arm, so it brings a 64bits compiler, and that seems to work fine here. Do you know of a way I could get access to a Termux running on 32bits arm? Thank you!

I can try it on my device, it's running on 32 bit mode.

[cognet]

@cattokomo ideally I'd need a shell on it, to try various things