Generally there are 2 types of context to save. More...

Collaboration diagram for SPARC Context Structures:

Data Structures
struct	CPU_Per_CPU_control
	The CPU specific per-CPU control. More...

struct	Context_Control
	This defines the minimal set of integer and processor state registers that must be saved during a voluntary context switch from one thread to another. More...

struct	Context_Control_fp
	This defines the complete set of floating point registers that must be saved during any context switch from one thread to another. More...

Macros
#define	_CPU_Context_Get_SP(_context) (_context)->o6_sp
	This macro provides a CPU independent way for RTEMS to access the stack pointer in a context structure. More...

#define	G5_OFFSET 0x00
	This macro defines an offset into the context for use in assembly. More...

#define	G7_OFFSET 0x04
	This macro defines an offset into the context for use in assembly. More...

#define	L0_OFFSET 0x08
	This macro defines an offset into the context for use in assembly. More...

#define	L1_OFFSET 0x0C
	This macro defines an offset into the context for use in assembly. More...

#define	L2_OFFSET 0x10
	This macro defines an offset into the context for use in assembly. More...

#define	L3_OFFSET 0x14
	This macro defines an offset into the context for use in assembly. More...

#define	L4_OFFSET 0x18
	This macro defines an offset into the context for use in assembly. More...

#define	L5_OFFSET 0x1C
	This macro defines an offset into the context for use in assembly. More...

#define	L6_OFFSET 0x20
	This macro defines an offset into the context for use in assembly. More...

#define	L7_OFFSET 0x24
	This macro defines an offset into the context for use in assembly. More...

#define	I0_OFFSET 0x28
	This macro defines an offset into the context for use in assembly. More...

#define	I1_OFFSET 0x2C
	This macro defines an offset into the context for use in assembly. More...

#define	I2_OFFSET 0x30
	This macro defines an offset into the context for use in assembly. More...

#define	I3_OFFSET 0x34
	This macro defines an offset into the context for use in assembly. More...

#define	I4_OFFSET 0x38
	This macro defines an offset into the context for use in assembly. More...

#define	I5_OFFSET 0x3C
	This macro defines an offset into the context for use in assembly. More...

#define	I6_FP_OFFSET 0x40
	This macro defines an offset into the context for use in assembly. More...

#define	I7_OFFSET 0x44
	This macro defines an offset into the context for use in assembly. More...

#define	O6_SP_OFFSET 0x48
	This macro defines an offset into the context for use in assembly. More...

#define	O7_OFFSET 0x4C
	This macro defines an offset into the context for use in assembly. More...

#define	PSR_OFFSET 0x50
	This macro defines an offset into the context for use in assembly. More...

#define	ISR_DISPATCH_DISABLE_STACK_OFFSET 0x54
	This macro defines an offset into the context for use in assembly. More...

#define	FO_F1_OFFSET 0x00
	This macro defines an offset into the FPU context for use in assembly. More...

#define	F2_F3_OFFSET 0x08
	This macro defines an offset into the FPU context for use in assembly. More...

#define	F4_F5_OFFSET 0x10
	This macro defines an offset into the FPU context for use in assembly. More...

#define	F6_F7_OFFSET 0x18
	This macro defines an offset into the FPU context for use in assembly. More...

#define	F8_F9_OFFSET 0x20
	This macro defines an offset into the FPU context for use in assembly. More...

#define	F1O_F11_OFFSET 0x28
	This macro defines an offset into the FPU context for use in assembly. More...

#define	F12_F13_OFFSET 0x30
	This macro defines an offset into the FPU context for use in assembly. More...

#define	F14_F15_OFFSET 0x38
	This macro defines an offset into the FPU context for use in assembly. More...

#define	F16_F17_OFFSET 0x40
	This macro defines an offset into the FPU context for use in assembly. More...

#define	F18_F19_OFFSET 0x48
	This macro defines an offset into the FPU context for use in assembly. More...

#define	F2O_F21_OFFSET 0x50
	This macro defines an offset into the FPU context for use in assembly. More...

#define	F22_F23_OFFSET 0x58
	This macro defines an offset into the FPU context for use in assembly. More...

#define	F24_F25_OFFSET 0x60
	This macro defines an offset into the FPU context for use in assembly. More...

#define	F26_F27_OFFSET 0x68
	This macro defines an offset into the FPU context for use in assembly. More...

#define	F28_F29_OFFSET 0x70
	This macro defines an offset into the FPU context for use in assembly. More...

#define	F3O_F31_OFFSET 0x78
	This macro defines an offset into the FPU context for use in assembly. More...

#define	FSR_OFFSET 0x80
	This macro defines an offset into the FPU context for use in assembly. More...

#define	CONTEXT_CONTROL_FP_SIZE 0x84
	This defines the size of the FPU context area for use in assembly. More...

Detailed Description

Generally there are 2 types of context to save.

Interrupt registers to save
Task level registers to save

This means we have the following 3 context items:

task level context stuff:: Context_Control
floating point task stuff:: Context_Control_fp
special interrupt level context :: Context_Control_interrupt

On the SPARC, we are relatively conservative in that we save most of the CPU state in the context area. The ET (enable trap) bit and the CWP (current window pointer) fields of the PSR are considered system wide resources and are not maintained on a per-thread basis.

Macro Definition Documentation

◆ _CPU_Context_Get_SP

#define _CPU_Context_Get_SP ( _context ) (_context)->o6_sp

This macro provides a CPU independent way for RTEMS to access the stack pointer in a context structure.

The actual name and offset is CPU architecture dependent.

◆ CONTEXT_CONTROL_FP_SIZE

#define CONTEXT_CONTROL_FP_SIZE 0x84

This defines the size of the FPU context area for use in assembly.

◆ F12_F13_OFFSET

#define F12_F13_OFFSET 0x30

This macro defines an offset into the FPU context for use in assembly.

◆ F14_F15_OFFSET

#define F14_F15_OFFSET 0x38

This macro defines an offset into the FPU context for use in assembly.

◆ F16_F17_OFFSET

#define F16_F17_OFFSET 0x40

This macro defines an offset into the FPU context for use in assembly.

◆ F18_F19_OFFSET

#define F18_F19_OFFSET 0x48

This macro defines an offset into the FPU context for use in assembly.

◆ F1O_F11_OFFSET

#define F1O_F11_OFFSET 0x28

This macro defines an offset into the FPU context for use in assembly.

◆ F22_F23_OFFSET

#define F22_F23_OFFSET 0x58

This macro defines an offset into the FPU context for use in assembly.

◆ F24_F25_OFFSET

#define F24_F25_OFFSET 0x60

This macro defines an offset into the FPU context for use in assembly.

◆ F26_F27_OFFSET

#define F26_F27_OFFSET 0x68

This macro defines an offset into the FPU context for use in assembly.

◆ F28_F29_OFFSET

#define F28_F29_OFFSET 0x70

This macro defines an offset into the FPU context for use in assembly.

◆ F2_F3_OFFSET

#define F2_F3_OFFSET 0x08

This macro defines an offset into the FPU context for use in assembly.

◆ F2O_F21_OFFSET

#define F2O_F21_OFFSET 0x50

This macro defines an offset into the FPU context for use in assembly.

◆ F3O_F31_OFFSET

#define F3O_F31_OFFSET 0x78

This macro defines an offset into the FPU context for use in assembly.

◆ F4_F5_OFFSET

#define F4_F5_OFFSET 0x10

This macro defines an offset into the FPU context for use in assembly.

◆ F6_F7_OFFSET

#define F6_F7_OFFSET 0x18

This macro defines an offset into the FPU context for use in assembly.

◆ F8_F9_OFFSET

#define F8_F9_OFFSET 0x20

This macro defines an offset into the FPU context for use in assembly.

◆ FO_F1_OFFSET

#define FO_F1_OFFSET 0x00

This macro defines an offset into the FPU context for use in assembly.

◆ FSR_OFFSET

#define FSR_OFFSET 0x80

This macro defines an offset into the FPU context for use in assembly.