| 2017-01-21 21:56:41 |
Daniel Böhmer |
bug |
|
|
added bug |
| 2017-01-21 21:58:45 |
Daniel Böhmer |
description |
The following function
__attribute__((always_inline))
__STATIC_INLINE void storeR12normally()
{
register uint32_t __rf __ASM("r12");
__rf = (uint32_t)testFunc;
__ASM volatile ("svc 0" : SVC_Out0 : SVC_In0 : SVC_CL2);
}
results in the following assembly:
register uint32_t r asm("r12");
r = (uint32_t)testFunc;
8000368: 4b04 ldr r3, [pc, #16] ; (800037c <main+0x18>)
800036a: 469c mov ip, r3
asm volatile ("svc 0" : : "r"(r) : "r0","r1");
800036c: df00 svc 0
The address of the function testFunc() is stored in register 12 (ip) as wanted.
However, when I try to put the same code in a templated function, the assembly is not correct anymore:
template<void(*F)()>
__attribute__((always_inline))
__STATIC_INLINE void storeR12template()
{
register uint32_t r asm("r12");
r = (uint32_t)F;
asm volatile ("svc 0" : : "r"(r) : "r0","r1");
}
results in:
register uint32_t r asm("r12");
r = (uint32_t)F;
800036e: 4c03 ldr r4, [pc, #12] ; (800037c <main+0x18>)
asm volatile ("svc 0" : : "r"(r) : "r0","r1");
8000370: df00 svc 0
The value is only loaded into r4 and not moved to r12 anymore.
I am using GCC 6.2 2016q4 (binary release) with the c++11 option and:
-mfpu=fpv4-sp-d16 -mfloat-abi=hard -mcpu=cortex-m4 -ffunction-sections -mthumb
compiled on a 64bit intel core i5-3230
Thank you,
Best regards
Daniel - mail@daniel-boehmer.net |
The following function
__attribute__((always_inline))
__STATIC_INLINE void storeR12normally()
{
register uint32_t __rf __ASM("r12");
__rf = (uint32_t)testFunc;
__ASM volatile ("svc 0" : SVC_Out0 : SVC_In0 : SVC_CL2);
}
results in the following assembly:
register uint32_t r asm("r12");
r = (uint32_t)testFunc;
8000368: 4b04 ldr r3, [pc, #16] ; (800037c <main+0x18>)
800036a: 469c mov ip, r3
asm volatile ("svc 0" : : "r"(r) : "r0","r1");
800036c: df00 svc 0
The address of the function testFunc() is stored in register 12 (ip) as wanted.
However, when I try to put the same code in a templated function, the assembly is not correct anymore:
template<void(*F)()>
__attribute__((always_inline))
__STATIC_INLINE void storeR12template()
{
register uint32_t r asm("r12");
r = (uint32_t)F;
asm volatile ("svc 0" : : "r"(r) : "r0","r1");
}
results in:
register uint32_t r asm("r12");
r = (uint32_t)F;
800036e: 4c03 ldr r4, [pc, #12] ; (800037c <main+0x18>)
asm volatile ("svc 0" : : "r"(r) : "r0","r1");
8000370: df00 svc 0
The value is only loaded into r4 and not moved to r12 anymore.
I am using GCC 6.2 2016q4 (binary release, windows) with the c++11 option and:
-mfpu=fpv4-sp-d16 -mfloat-abi=hard -mcpu=cortex-m4 -ffunction-sections -mthumb
compiled on a 64bit intel core i5-3230
Thank you,
Best regards
Daniel - mail@daniel-boehmer.net |
|
| 2017-01-22 17:20:50 |
Daniel Böhmer |
description |
The following function
__attribute__((always_inline))
__STATIC_INLINE void storeR12normally()
{
register uint32_t __rf __ASM("r12");
__rf = (uint32_t)testFunc;
__ASM volatile ("svc 0" : SVC_Out0 : SVC_In0 : SVC_CL2);
}
results in the following assembly:
register uint32_t r asm("r12");
r = (uint32_t)testFunc;
8000368: 4b04 ldr r3, [pc, #16] ; (800037c <main+0x18>)
800036a: 469c mov ip, r3
asm volatile ("svc 0" : : "r"(r) : "r0","r1");
800036c: df00 svc 0
The address of the function testFunc() is stored in register 12 (ip) as wanted.
However, when I try to put the same code in a templated function, the assembly is not correct anymore:
template<void(*F)()>
__attribute__((always_inline))
__STATIC_INLINE void storeR12template()
{
register uint32_t r asm("r12");
r = (uint32_t)F;
asm volatile ("svc 0" : : "r"(r) : "r0","r1");
}
results in:
register uint32_t r asm("r12");
r = (uint32_t)F;
800036e: 4c03 ldr r4, [pc, #12] ; (800037c <main+0x18>)
asm volatile ("svc 0" : : "r"(r) : "r0","r1");
8000370: df00 svc 0
The value is only loaded into r4 and not moved to r12 anymore.
I am using GCC 6.2 2016q4 (binary release, windows) with the c++11 option and:
-mfpu=fpv4-sp-d16 -mfloat-abi=hard -mcpu=cortex-m4 -ffunction-sections -mthumb
compiled on a 64bit intel core i5-3230
Thank you,
Best regards
Daniel - mail@daniel-boehmer.net |
The following function
__attribute__((always_inline))
__STATIC_INLINE void storeR12normally()
{
register uint32_t __rf __ASM("r12");
__rf = (uint32_t)testFunc;
__ASM volatile ("svc 0" : SVC_Out0 : SVC_In0 : SVC_CL2);
}
results in the following assembly:
register uint32_t r asm("r12");
r = (uint32_t)testFunc;
8000368: 4b04 ldr r3, [pc, #16] ; (800037c <main+0x18>)
800036a: 469c mov ip, r3
asm volatile ("svc 0" : : "r"(r) : "r0","r1");
800036c: df00 svc 0
The address of the function testFunc() is stored in register 12 (ip) as wanted.
However, when I try to put the same code in a templated function, the assembly is not correct anymore:
template<void(*F)()>
__attribute__((always_inline))
__STATIC_INLINE void storeR12template()
{
register uint32_t r asm("r12");
r = (uint32_t)F;
asm volatile ("svc 0" : : "r"(r) : "r0","r1");
}
results in:
register uint32_t r asm("r12");
r = (uint32_t)F;
800036e: 4c03 ldr r4, [pc, #12] ; (800037c <main+0x18>)
asm volatile ("svc 0" : : "r"(r) : "r0","r1");
8000370: df00 svc 0
The value is only loaded into r4 and not moved to r12 anymore.
I am using GCC 6.2 2016q4 (binary release, windows) with the c++11 option and:
-O0 -mfpu=fpv4-sp-d16 -mfloat-abi=hard -mcpu=cortex-m4 -ffunction-sections -mthumb
compiled on a 64bit intel core i5-3230
Thank you,
Best regards
Daniel - mail@daniel-boehmer.net |
|
| 2017-01-23 07:15:18 |
Daniel Böhmer |
description |
The following function
__attribute__((always_inline))
__STATIC_INLINE void storeR12normally()
{
register uint32_t __rf __ASM("r12");
__rf = (uint32_t)testFunc;
__ASM volatile ("svc 0" : SVC_Out0 : SVC_In0 : SVC_CL2);
}
results in the following assembly:
register uint32_t r asm("r12");
r = (uint32_t)testFunc;
8000368: 4b04 ldr r3, [pc, #16] ; (800037c <main+0x18>)
800036a: 469c mov ip, r3
asm volatile ("svc 0" : : "r"(r) : "r0","r1");
800036c: df00 svc 0
The address of the function testFunc() is stored in register 12 (ip) as wanted.
However, when I try to put the same code in a templated function, the assembly is not correct anymore:
template<void(*F)()>
__attribute__((always_inline))
__STATIC_INLINE void storeR12template()
{
register uint32_t r asm("r12");
r = (uint32_t)F;
asm volatile ("svc 0" : : "r"(r) : "r0","r1");
}
results in:
register uint32_t r asm("r12");
r = (uint32_t)F;
800036e: 4c03 ldr r4, [pc, #12] ; (800037c <main+0x18>)
asm volatile ("svc 0" : : "r"(r) : "r0","r1");
8000370: df00 svc 0
The value is only loaded into r4 and not moved to r12 anymore.
I am using GCC 6.2 2016q4 (binary release, windows) with the c++11 option and:
-O0 -mfpu=fpv4-sp-d16 -mfloat-abi=hard -mcpu=cortex-m4 -ffunction-sections -mthumb
compiled on a 64bit intel core i5-3230
Thank you,
Best regards
Daniel - mail@daniel-boehmer.net |
The following function
__attribute__((always_inline))
static inline void storeR12normally()
{
register uint32_t r asm("r12");
r = (uint32_t)testFunc;
asm volatile ("svc 0" : : "r"(r) : "r0","r1");
}
results in the following assembly:
register uint32_t r asm("r12");
r = (uint32_t)testFunc;
8000368: 4b04 ldr r3, [pc, #16] ; (800037c <main+0x18>)
800036a: 469c mov ip, r3
asm volatile ("svc 0" : : "r"(r) : "r0","r1");
800036c: df00 svc 0
The address of the function testFunc() is stored in register 12 (ip) as wanted.
However, when I try to put the same code in a templated function, the assembly is not correct anymore:
template<void(*F)()>
__attribute__((always_inline))
static inline void storeR12template()
{
register uint32_t r asm("r12");
r = (uint32_t)F;
asm volatile ("svc 0" : : "r"(r) : "r0","r1");
}
results in:
register uint32_t r asm("r12");
r = (uint32_t)F;
800036e: 4c03 ldr r4, [pc, #12] ; (800037c <main+0x18>)
asm volatile ("svc 0" : : "r"(r) : "r0","r1");
8000370: df00 svc 0
The value is only loaded into r4 and not moved to r12 anymore.
I am using GCC 6.2 2016q4 (binary release, windows) with the c++11 option and:
-O0 -mfpu=fpv4-sp-d16 -mfloat-abi=hard -mcpu=cortex-m4 -ffunction-sections -mthumb
compiled on a 64bit intel core i5-3230
Thank you,
Best regards
Daniel - mail@daniel-boehmer.net |
|
