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Re: [Qemu-arm] [Qemu-devel] [PATCH v2 08/23] target/arm: Move all v7m in

From: Philippe Mathieu-Daudé
Subject: Re: [Qemu-arm] [Qemu-devel] [PATCH v2 08/23] target/arm: Move all v7m insn helpers into their own file
Date: Mon, 17 Jun 2019 14:12:07 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1

On 6/17/19 1:42 PM, Alex Bennée wrote:
> Philippe Mathieu-Daudé <address@hidden> writes:
>> From: Samuel Ortiz <address@hidden>
>> In preparation for supporting TCG disablement on ARM, we move most
>> of TCG related v7m helpers and APIs into their own file.
>> Signed-off-by: Samuel Ortiz <address@hidden>
>> [PMD: Patch rewritten]
>> Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
>> ---
>> Is there a way to not use $CONFIG_USER_ONLY?
> Is this because the CONFIG_ARM_V7M symbol only appears for softmmu
> targets but we still want vXm -cpu's for user mode?

No :(

If I use this diff:

-- >8 --
diff --git a/target/arm/helper.h b/target/arm/helper.h
@@ -58,24 +58,26 @@ DEF_HELPER_2(pre_smc, void, env, i32)
 DEF_HELPER_1(check_breakpoints, void, env)

 DEF_HELPER_3(cpsr_write, void, env, i32, i32)
 DEF_HELPER_2(cpsr_write_eret, void, env, i32)
 DEF_HELPER_1(cpsr_read, i32, env)

 DEF_HELPER_3(v7m_msr, void, env, i32, i32)
 DEF_HELPER_2(v7m_mrs, i32, env, i32)

 DEF_HELPER_2(v7m_bxns, void, env, i32)
 DEF_HELPER_2(v7m_blxns, void, env, i32)

 DEF_HELPER_3(v7m_tt, i32, env, i32, i32)

 DEF_HELPER_1(v7m_preserve_fp_state, void, env)

 DEF_HELPER_2(v7m_vlstm, void, env, i32)
 DEF_HELPER_2(v7m_vlldm, void, env, i32)
+#endif /* CONFIG_USER_ONLY */

 DEF_HELPER_2(v8m_stackcheck, void, env, i32)

I get:

target/arm/translate.c:10607:29: error: nested extern declaration of
‘gen_helper_v7m_mrs’ [-Werror=nested-externs]
target/arm/translate.c: In function ‘disas_thumb_insn’:
target/arm/translate.c:11224:25: error: implicit declaration of function
‘gen_blxns’; did you mean ‘gen_bx’? [-Werror=implicit-function-declaration]
                         gen_blxns(s, rm);


static void disas_thumb_insn(DisasContext *s, uint32_t insn)
    switch (insn >> 12) {
    case 4:
        if (insn & (1 << 10)) {
            case 3:
                /* 0b0100_0111_xxxx_xxxx
                 * - branch [and link] exchange thumb register
                bool link = insn & (1 << 7);

                if (insn & 3) {
                    goto undef;
                if (link) {
                if ((insn & 4)) {
                    /* BXNS/BLXNS: only exists for v8M with the
                     * security extensions, and always UNDEF if NonSecure.
                     * We don't implement these in the user-only mode
                     * either (in theory you can use them from Secure User
                     * mode but they are too tied in to system emulation.)
                    if (!s->v8m_secure || IS_USER_ONLY) {
                        goto undef;
                    if (link) {
                        gen_blxns(s, rm);
                    } else {
                        gen_bxns(s, rm);

Should we add "#ifndef CONFIG_USER_ONLY" all around? I believe we rather

For 'cps' and 'mrs' we have:

                        /* Implemented as NOP in user mode.  */
                        if (IS_USER(s))

but not for 'msr'.

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