Platform-Specific Registers (Sun Studio 12 Update 1: Debugging a Program With dbx)

Sun Studio 12 Update 1: Debugging a Program With dbx

Platform-Specific Registers

The following tables list platform-specific register names for SPARC architecture, x86 architecture, and AMD64 architecture that can be used in expressions.

SPARC Register Information

The following register information is for [Please define the SPARCsans text entity] architecture.

Register	Description
`$g0 through $g7`	Global registers
`$o0 through $o7`	“out” registers
`$l0 through $l7`	“local” registers
`$i0 through $i7`	“in” registers
`$fp`	Frame pointer, equivalent to register $i6
`$sp`	Stack pointer, equivalent to register $o6
`$y`	Y register
`$psr`	Processor state register
`$wim`	Window invalid mask register
`$tbr`	Trap base register
`$pc`	Program counter
`$npc`	Next program counter
`$f0 through $f31`	FPU “f” registers
`$fsr`	FPU status register
`$fq`	FPU queue

The $f0f1 $f2f3 ... $f30f31 pairs of floating-point registers are treated as having C “double” type (normally $fN registers are treated as C “float” type). These pairs can also be referred to as $d0 ... $d30.

The following additional registers are available on SPARC V9 and V8+ hardware:

$g0g1 through $g6g7
$o0o1 through $o6o7
$xfsr $tstate $gsr
$f32f33 $f34f35 through $f62f63 ($d32 ... $$d62)

See the SPARC Architecture Reference Manual and the SPARC Assembly Language Reference Manual for more information on SPARC registers and addressing.

x86 Register Information

The following register information is for x86 architecture.

Register	Description
`$gs`	Alternate data segment register
`$fs`	Alternate data segment register
`$es`	Alternate data segment register
`$ds`	Data segment register
`$edi`	Destination index register
`$esi`	Source index register
`$ebp`	Frame pointer
`$esp`	Stack pointer
`$ebx`	General register
`$edx`	General register
`$ecx`	General register
`$eax`	General register
`$trapno`	Exception vector number
`$err`	Error code for exception
`$eip`	Instruction pointer
`$cs`	Code segment register
`$eflags`	Flags
`$uesp`	User stack pointer
`$ss`	Stack segment register

Commonly used registers are also aliased to their machine independent names.

Register	Description
`$sp`	Stack pointer; equivalent of `$uesp`
`$pc`	Program counter; equivalent of `$eip`
`$fp`	Frame pointer; equivalent of `$ebp`

Registers for the 80386 lower halves (16 bits) are:

Register	Description
`$ax`	General register
`$cx`	General register
`$dx`	General register
`$bx`	General register
`$si`	Source index register
`$di`	Destination index register
`$ip`	Instruction pointer, lower 16 bits
`$flags`	Flags, lower 16 bits

The first four 80386 16-bit registers can be split into 8-bit parts:

Register	Description
`$al`	Lower (right) half of register `$ax`
`$ah`	Higher (left) half of register `$ax`
`$cl`	Lower (right) half of register `$cx`
`$ch`	Higher (left) half of register `$cx`
`$dl`	Lower (right) half of register `$dx`
`$dh`	Higher (left) half of register `$dx`
`$bl`	Lower (right) half of register `$bx`
`$bh`	Higher (left) half of register `$bx`

Registers for the 80387 are:

Register	Description
`$fctrl`	Control register
`$fstat`	Status register
`$ftag`	Tag register
`$fip`	Instruction pointer offset
`$fcs`	Code segment selector
`$fopoff`	Operand pointer offset
`$fopsel`	Operand pointer selector
`$st0 through $st7`	Data registers

AMD64 Register Information

The following r egister information is for AMD64 architecture:

Register	Description
`rax`	General purpose register - argument passing for function calls
`rbx`	General purpose register - callee-saved
`rcx`	General purpose register - argument passing for function calls
`rdx`	General purpose register - argument passing for function calls
`rbp`	General purpose register - stack management/frame pointer
`rsi`	General purpose register - argument passing for function calls
`rdi`	General purpose register - argument passing for function calls
`rsp`	General purpose register - stack management/stack pointer
`r8`	General purpose register - argument passing for function calls
`r9`	General purpose register - argument passing for function calls
`r10`	General purpose register - temporary
`r11`	General purpose register - temporary
`r12`	General purpose register - callee-saved
`r13`	General purpose register - callee-saved
`r14`	General purpose register - callee-saved
`r15`	General purpose register - callee-saved
`rflags`	Flags register
`rip`	Instruction pointer
`mmx0/st0`	64-bit media and floating point register
`mmx1/st1`	64-bit media and floating point register
`mmx2/st2`	64-bit media and floating point register
`mmx3/st3`	64-bit media and floating point register
`mmx4/st4`	64-bit media and floating point register
`mmx5/st5`	64-bit media and floating point register
`mmx6/st6`	64-bit media and floating point register
`mmx7/st7`	64-bit media and floating point register
`xmm0`	128-bit media register
`xmm1`	128-bit media register
`xmm2`	128-bit media register
`xmm3`	128-bit media register
`xmm4`	128-bit media register
`xmm5`	128-bit media register
`xmm6`	128-bit media register
`xmm7`	128-bit media register
`xmm8`	128-bit media register
`xmm9`	128-bit media register
`xmm10`	128-bit media register
`xmm11`	128-bit media register
`xmm12`	128-bit media register
`xmm13`	128-bit media register
`xmm14`	128-bit media register
`xmm15`	128-bit media register
`cs`	Segment register
`os`	Segment register
`es`	Segment register
`fs`	Segment register
`gs`	Segment register
`ss`	Segment register
`fcw`	`fxsave` and `fxstor` memory image control word
`fsw`	`fxsave` and `fxstor` memory image status word
`ftw`	`fxsave` and `fxstor` memory image tag word
`fop`	`fxsave` and `fxstor` memory image last x87 op code
`frip`	`fxsave` and `fxstor` memory image 64-bit offset into the code segment
`frdp`	`fxsave` and `fxstor` memory image 64-bit offset into the date segment
`mxcsr`	`fxsave` and `fxstor` memory image 128 media instruction control and status register
`mxcsr_mask`	set bits in `mxcsr_mask` indicate supported feature bits in `mxcsr`