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| author | Eli Zaretskii <eliz@gnu.org> | 2005-12-28 20:05:49 +0000 |
|---|---|---|
| committer | Eli Zaretskii <eliz@gnu.org> | 2005-12-28 20:05:49 +0000 |
| commit | 36b80e652cc323db04e6e049a6c85caef1a8bcf1 (patch) | |
| tree | 3f1aa1ae0a27c23742d28d3630afff6896e8f84d | |
| parent | a1b06f3564a44e113063ec06d7794063670e5a76 (diff) | |
| download | gdb-36b80e652cc323db04e6e049a6c85caef1a8bcf1.zip gdb-36b80e652cc323db04e6e049a6c85caef1a8bcf1.tar.gz gdb-36b80e652cc323db04e6e049a6c85caef1a8bcf1.tar.bz2 | |
* gdb.texinfo (Registers): Describe how to refer to SSE and MMX
registers and the likes.
| -rw-r--r-- | gdb/doc/ChangeLog | 5 | ||||
| -rw-r--r-- | gdb/doc/gdb.texinfo | 30 |
2 files changed, 35 insertions, 0 deletions
diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog index def1289..6f62bb6 100644 --- a/gdb/doc/ChangeLog +++ b/gdb/doc/ChangeLog @@ -1,3 +1,8 @@ +2005-12-28 Eli Zaretskii <eliz@gnu.org> + + * gdb.texinfo (Registers): Describe how to refer to SSE and MMX + registers and the likes. + 2005-12-24 Eli Zaretskii <eliz@gnu.org> * gdb.texinfo (Target Commands, Bug Reporting, File Options) diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo index ae1ad18..ea22517 100644 --- a/gdb/doc/gdb.texinfo +++ b/gdb/doc/gdb.texinfo @@ -6279,6 +6279,36 @@ cases, @value{GDBN} normally works with the virtual format only (the format that makes sense for your program), but the @code{info registers} command prints the data in both formats. +@cindex SSE registers (x86) +@cindex MMX registers (x86) +Some machines have special registers whose contents can be interpreted +in several different ways. For example, modern x86-based machines +have SSE and MMX registers that can hold several values packed +together in several different formats. @value{GDBN} refers to such +registers in @code{struct} notation: + +@smallexample +(@value{GDBP}) print $xmm1 +$1 = @{ + v4_float = @{0, 3.43859137e-038, 1.54142831e-044, 1.821688e-044@}, + v2_double = @{9.92129282474342e-303, 2.7585945287983262e-313@}, + v16_int8 = "\000\000\000\000\3706;\001\v\000\000\000\r\000\000", + v8_int16 = @{0, 0, 14072, 315, 11, 0, 13, 0@}, + v4_int32 = @{0, 20657912, 11, 13@}, + v2_int64 = @{88725056443645952, 55834574859@}, + uint128 = 0x0000000d0000000b013b36f800000000 +@} +@end smallexample + +@noindent +To set values of such registers, you need to tell @value{GDBN} which +view of the register you wish to change, as if you were assigning +value to a @code{struct} member: + +@smallexample + (@value{GDBP}) set $xmm1.uint128 = 0x000000000000000000000000FFFFFFFF +@end smallexample + Normally, register values are relative to the selected stack frame (@pxref{Selection, ,Selecting a frame}). This means that you get the value that the register would contain if all stack frames farther in |