CMSIS inHandlerMode() Function
i am using CMSIS on a STM32. I stumbled upon a function which seems to be able to detect whether i'm in an IRQ handler or "normal" thread mode.
Basically this function ends up calling
__attribute__( ( always_inline ) ) __STATIC_INLINE uint32_t __get_IPSR(void)
{
uint32_t result;
__ASM volatile ("MRS %0, ipsr" : "=r" (result) );
return(result);
}
my assembler is a little rusty. But if i got this right this reads the content of some core register called IPSR?!
According to ARMs support document:
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0552a/CHDBIBGJ.html
If this register value is 0 i'm in thread mode otherwise i'm in an IRQ handler.
Why do i need the assembler stuff to read this register, why can i not access the register the same way i access all other registers?
/* Determine whether we are in thread mode or handler mode. */
static int inHandlerMode (void)
{
return __get_IPSR() != 0;
}
Can i make this function non static (aka publically visible) or did the CMSIS guys made this function private for a good reason?
cmsis
asked Nov 21 '18 at 22:20
JuliusCaesarJuliusCaesar
878
add a comment |
i am using CMSIS on a STM32. I stumbled upon a function which seems to be able to detect whether i'm in an IRQ handler or "normal" thread mode.
Basically this function ends up calling
__attribute__( ( always_inline ) ) __STATIC_INLINE uint32_t __get_IPSR(void)
{
uint32_t result;
__ASM volatile ("MRS %0, ipsr" : "=r" (result) );
return(result);
}
my assembler is a little rusty. But if i got this right this reads the content of some core register called IPSR?!
According to ARMs support document:
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0552a/CHDBIBGJ.html
If this register value is 0 i'm in thread mode otherwise i'm in an IRQ handler.
Why do i need the assembler stuff to read this register, why can i not access the register the same way i access all other registers?
/* Determine whether we are in thread mode or handler mode. */
static int inHandlerMode (void)
{
return __get_IPSR() != 0;
}
Can i make this function non static (aka publically visible) or did the CMSIS guys made this function private for a good reason?
cmsis
asked Nov 21 '18 at 22:20
JuliusCaesarJuliusCaesar
878
add a comment |
i am using CMSIS on a STM32. I stumbled upon a function which seems to be able to detect whether i'm in an IRQ handler or "normal" thread mode.
Basically this function ends up calling
__attribute__( ( always_inline ) ) __STATIC_INLINE uint32_t __get_IPSR(void)
{
uint32_t result;
__ASM volatile ("MRS %0, ipsr" : "=r" (result) );
return(result);
}
my assembler is a little rusty. But if i got this right this reads the content of some core register called IPSR?!
According to ARMs support document:
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0552a/CHDBIBGJ.html
If this register value is 0 i'm in thread mode otherwise i'm in an IRQ handler.
Why do i need the assembler stuff to read this register, why can i not access the register the same way i access all other registers?
/* Determine whether we are in thread mode or handler mode. */
static int inHandlerMode (void)
{
return __get_IPSR() != 0;
}
Can i make this function non static (aka publically visible) or did the CMSIS guys made this function private for a good reason?
cmsis
asked Nov 21 '18 at 22:20
JuliusCaesarJuliusCaesar
878
i am using CMSIS on a STM32. I stumbled upon a function which seems to be able to detect whether i'm in an IRQ handler or "normal" thread mode.
Basically this function ends up calling
__attribute__( ( always_inline ) ) __STATIC_INLINE uint32_t __get_IPSR(void)
{
uint32_t result;
__ASM volatile ("MRS %0, ipsr" : "=r" (result) );
return(result);
}
my assembler is a little rusty. But if i got this right this reads the content of some core register called IPSR?!
According to ARMs support document:
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0552a/CHDBIBGJ.html
If this register value is 0 i'm in thread mode otherwise i'm in an IRQ handler.
Why do i need the assembler stuff to read this register, why can i not access the register the same way i access all other registers?
/* Determine whether we are in thread mode or handler mode. */
static int inHandlerMode (void)
{
return __get_IPSR() != 0;
}
Can i make this function non static (aka publically visible) or did the CMSIS guys made this function private for a good reason?
cmsis
cmsis
asked Nov 21 '18 at 22:20
JuliusCaesarJuliusCaesar
878
asked Nov 21 '18 at 22:20
JuliusCaesarJuliusCaesar
878
asked Nov 21 '18 at 22:20
JuliusCaesarJuliusCaesar
878
asked Nov 21 '18 at 22:20
JuliusCaesarJuliusCaesar
878
asked Nov 21 '18 at 22:20
JuliusCaesarJuliusCaesar
878
878
add a comment |
add a comment |
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