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Fix unified syntax in ARM inline assembly

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GCC 4.9 always emits assembly with divided syntax. Setting unified
syntax in inline assembly causes the assembler to complain about
GCC's generated code, because the directive extends past the scope
of the inline asm. Fix this by setting divided mode at the end of
the inline assembly block.

The assembler directives are hidden behind macros because later
versions of GCC won't need this workaround: they can be told to
use the unified syntax with -masm-syntax-unified.

Change-Id: Ic09e729e5bbb6fd44d08dac348daf6f55c75d7d8
This commit is contained in:
Aidan MacDonald 2023-03-23 18:16:15 +00:00
parent 86429dbf1e
commit 58b2e45782
7 changed files with 28 additions and 9 deletions
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6
apps/plugins/mpegplayer/mpeg_misc.h
View file

@ -53,13 +53,14 @@ enum state_enum
#define CMP_3_CONST(_a, _b) \
({ int _x; \
asm volatile ( \
".syntax unified \n" \
BEGIN_ARM_ASM_SYNTAX_UNIFIED \
"ldrb %[x], [%[a], #0] \n" \
"eors %[x], %[x], %[b0] \n" \
"ldrbeq %[x], [%[a], #1] \n" \
"eorseq %[x], %[x], %[b1] \n" \
"ldrbeq %[x], [%[a], #2] \n" \
"eorseq %[x], %[x], %[b2] \n" \
END_ARM_ASM_SYNTAX_UNIFIED \
: [x]"=&r"(_x) \
: [a]"r"(_a), \
[b0]"i"(((_b) >> 24) & 0xff), \
@ -71,7 +72,7 @@ enum state_enum
#define CMP_4_CONST(_a, _b) \
({ int _x; \
asm volatile ( \
".syntax unified \n" \
BEGIN_ARM_ASM_SYNTAX_UNIFIED \
"ldrb %[x], [%[a], #0] \n" \
"eors %[x], %[x], %[b0] \n" \
"ldrbeq %[x], [%[a], #1] \n" \
@ -80,6 +81,7 @@ enum state_enum
"eorseq %[x], %[x], %[b2] \n" \
"ldrbeq %[x], [%[a], #3] \n" \
"eorseq %[x], %[x], %[b3] \n" \
END_ARM_ASM_SYNTAX_UNIFIED \
: [x]"=&r"(_x) \
: [a]"r"(_a), \
[b0]"i"(((_b) >> 24) & 0xff), \

3
firmware/asm/arm/corelock.c
View file

@ -61,7 +61,7 @@ int corelock_try_lock(struct corelock *cl)
/* Relies on the fact that core IDs are complementary bitmasks (0x55,0xaa) */
asm volatile (
".syntax unified \n"
BEGIN_ARM_ASM_SYNTAX_UNIFIED
"mov r1, %[id] \n" /* r1 = PROCESSOR_ID */
"ldrb r1, [r1] \n"
"strb r1, [%[cl], r1, lsr #7] \n" /* cl->myl[core] = core */
@ -74,6 +74,7 @@ int corelock_try_lock(struct corelock *cl)
"ands %[rv], %[rv], r1 \n"
"strbeq %[rv], [%[cl], r1, lsr #7] \n" /* if not, cl->myl[core] = 0 */
"1: \n" /* Done */
END_ARM_ASM_SYNTAX_UNIFIED
: [rv] "=r"(rval)
: [id] "i" (&PROCESSOR_ID), [cl] "r" (cl)
: "r1","r2","cc"

3
firmware/asm/arm/thread.c
View file

@ -73,7 +73,7 @@ static inline void store_context(void* addr)
static inline void load_context(const void* addr)
{
asm volatile(
".syntax unified \n"
BEGIN_ARM_ASM_SYNTAX_UNIFIED
"ldr r0, [%0, #40] \n" /* Load start pointer */
"cmp r0, #0 \n" /* Check for NULL */
@ -86,6 +86,7 @@ static inline void load_context(const void* addr)
#endif
"ldmia %0, { r4-r11, sp, lr } \n" /* Load regs r4 to r14 from context */
END_ARM_ASM_SYNTAX_UNIFIED
: : "r" (addr) : "r0" /* only! */
);
}

10
firmware/export/config.h
View file

@ -1005,6 +1005,16 @@ Lyre prototype 1 */
#define ROCKBOX_STRICT_ALIGN 1
#endif
/*
* These macros are for switching on unified syntax in inline assembly.
* Older versions of GCC emit assembly in divided syntax with no option
* to enable unified syntax.
*
* FIXME: This needs to be looked at after the toolchain bump
*/
#define BEGIN_ARM_ASM_SYNTAX_UNIFIED ".syntax unified\n"
#define END_ARM_ASM_SYNTAX_UNIFIED ".syntax divided\n"
#if defined(CPU_ARM) && defined(__ASSEMBLER__)
.syntax unified
/* ARMv4T doesn't switch the T bit when popping pc directly, we must use BX */

3
firmware/target/arm/pcm-telechips.c
View file

@ -218,7 +218,7 @@ void fiq_handler(void)
* r0-r3 and r12 is a working register.
*/
asm volatile (
".syntax unified \n"
BEGIN_ARM_ASM_SYNTAX_UNIFIED
"sub lr, lr, #4 \n"
"stmfd sp!, { r0-r3, lr } \n" /* stack scratch regs and lr */
"mov r14, #0 \n" /* Was the callback called? */
@ -274,6 +274,7 @@ void fiq_handler(void)
"bhi .fill_fifo \n" /* not stop and enough? refill */
"ldmfd sp!, { r0-r3, pc }^ \n" /* exit */
".ltorg \n"
END_ARM_ASM_SYNTAX_UNIFIED
: : "i"(PCM_DMAST_OK), "i"(PCM_DMAST_STARTED)
);
}

3
firmware/target/arm/pp/pcm-pp.c
View file

@ -327,7 +327,7 @@ void fiq_playback(void)
*/
asm volatile (
/* No external calls */
".syntax unified \n"
BEGIN_ARM_ASM_SYNTAX_UNIFIED
"sub lr, lr, #4 \n" /* Prepare return address */
"stmfd sp!, { lr } \n" /* stack lr so we can use it */
"ldr r12, =0xcf001040 \n" /* Some magic from iPodLinux ... */
@ -395,6 +395,7 @@ void fiq_playback(void)
"bne 3b \n" /* no? -> go return */
"b 2b \n" /* yes -> get even more */
".ltorg \n"
END_ARM_ASM_SYNTAX_UNIFIED
: /* These must only be integers! No regs */
: "i"(PCM_DMAST_OK), "i"(PCM_DMAST_STARTED));
}

9
lib/rbcodec/codecs/demac/libdemac/vector_math16_armv6.h
View file

@ -45,7 +45,7 @@ static inline int32_t vector_sp_add(int16_t* v1, int16_t* f2, int16_t* s2)
#endif
asm volatile (
".syntax unified \n"
BEGIN_ARM_ASM_SYNTAX_UNIFIED
#if ORDER > 32
"mov %[res], #0 \n"
#endif
@ -186,6 +186,7 @@ static inline int32_t vector_sp_add(int16_t* v1, int16_t* f2, int16_t* s2)
#endif
"99: \n"
END_ARM_ASM_SYNTAX_UNIFIED
: /* outputs */
#if ORDER > 32
[cnt]"+r"(cnt),
@ -215,7 +216,7 @@ static inline int32_t vector_sp_sub(int16_t* v1, int16_t* f2, int16_t* s2)
#endif
asm volatile (
".syntax unified \n"
BEGIN_ARM_ASM_SYNTAX_UNIFIED
#if ORDER > 32
"mov %[res], #0 \n"
#endif
@ -356,6 +357,7 @@ static inline int32_t vector_sp_sub(int16_t* v1, int16_t* f2, int16_t* s2)
#endif
"99: \n"
END_ARM_ASM_SYNTAX_UNIFIED
: /* outputs */
#if ORDER > 32
[cnt]"+r"(cnt),
@ -383,7 +385,7 @@ static inline int32_t scalarproduct(int16_t* v1, int16_t* v2)
#endif
asm volatile (
".syntax unified \n"
BEGIN_ARM_ASM_SYNTAX_UNIFIED
#if ORDER > 32
"mov %[res], #0 \n"
#endif
@ -477,6 +479,7 @@ static inline int32_t scalarproduct(int16_t* v1, int16_t* v2)
#endif
"99: \n"
END_ARM_ASM_SYNTAX_UNIFIED
: /* outputs */
#if ORDER > 32
[cnt]"+r"(cnt),