Difference between thumb machine directives

Hi Experts, What is the key difference between the following directives .thumb .thumb_func .force_thumb .thumb_set What is the exact use case where the above things can to be applied ? Regards, Techguyz...
Question about a code snippet on ARM, Thumb state change

Hi, I find the following code snippet online on ARM state change. Although that whole material looks solid, the second line in the blue code below is puzzling. add R1,PC,#1 ;Load address of SUB_BRANCH...
ELF entry point in thumb mode (armv7/aarch32)

Hi ! We are writing an OS targeting 32 bits ARM platform, where binaries can be compiled in ARM or in Thumb mode. At the moment, to execute a new process, I load the info from an ELF, set lr_usr to the...
[Cortex-M0] Thumb mode & code size

Hi, I'm somewhat confused with the Thumb mode code size. My understanding is compiling with ARM mode will generate 32-bit instructions and compiling with Thumb mode will generate 16-bit instructions...
State of link register on an interrupt from Thumb (ARM7TDMI).

Hi, If an interrupt occurs when in Thumb state, does the LSB of the link register become 1. Thanks, Revanth