diff options
Diffstat (limited to 'gas')
| -rw-r--r-- | gas/ChangeLog | 4 | ||||
| -rw-r--r-- | gas/doc/c-xtensa.texi | 44 |
2 files changed, 48 insertions, 0 deletions
diff --git a/gas/ChangeLog b/gas/ChangeLog index 2c187a9..0dff880 100644 --- a/gas/ChangeLog +++ b/gas/ChangeLog @@ -1,3 +1,7 @@ +2006-08-25 Bob Wilson <bob.wilson@acm.org> + + * doc/c-xtensa.texi: Add @group commands in examples. + 2006-08-24 Bob Wilson <bob.wilson@acm.org> * config/tc-xtensa.c (FINI_LITERAL_SECTION_NAME): Delete. diff --git a/gas/doc/c-xtensa.texi b/gas/doc/c-xtensa.texi index 1a683fc..6de47db 100644 --- a/gas/doc/c-xtensa.texi +++ b/gas/doc/c-xtensa.texi @@ -116,13 +116,17 @@ instruction, are specified by enclosing the bundled opcodes inside braces: @smallexample +@group @{ [@var{format}] @var{opcode0} [@var{operands}] +@end group @var{opcode1} [@var{operands}] +@group @var{opcode2} [@var{operands}] @dots{} @} +@end group @end smallexample The opcodes in a FLIX instruction are listed in the same order as the @@ -326,9 +330,11 @@ replace the branch with a branch around a jump. For example, may result in: @smallexample +@group bnez.n a2, M j L M: +@end group @end smallexample (The @code{BNEZ.N} instruction would be used in this example only if the @@ -370,9 +376,11 @@ and then using a @code{CALLX} instruction. So, for example: might be relaxed to: @smallexample +@group .literal .L1, func l32r a8, .L1 callx8 a8 +@end group @end smallexample Because the addresses of targets of function calls are not generally @@ -413,8 +421,10 @@ materialized with @code{L32R} instructions. Thus: is assembled into the following machine code: @smallexample +@group .literal .L1, 100000 l32r a0, .L1 +@end group @end smallexample @cindex @code{L8UI} instructions, relaxation @@ -440,10 +450,14 @@ is different than the source address register. For example: is translated to: @smallexample +@group .literal .L1, 2040 l32r a1, .L1 +@end group +@group addi a1, a0, a1 l32i a1, a1, 0 +@end group @end smallexample @noindent @@ -467,22 +481,30 @@ with a literal allocated from the literal pool. For example: @smallexample +@group addi a5, a6, 0 addi a5, a6, 512 +@end group +@group addi a5, a6, 513 addi a5, a6, 50000 +@end group @end smallexample is assembled into the following: @smallexample +@group .literal .L1, 50000 mov.n a5, a6 +@end group addmi a5, a6, 0x200 addmi a5, a6, 0x200 addi a5, a5, 1 +@group l32r a5, .L1 add a5, a6, a5 +@end group @end smallexample @node Xtensa Directives @@ -493,9 +515,11 @@ is assembled into the following: The Xtensa assembler supports a region-based directive syntax: @smallexample +@group .begin @var{directive} [@var{options}] @dots{} .end @var{directive} +@end group @end smallexample All the Xtensa-specific directives that apply to a region of code use @@ -509,13 +533,17 @@ change the state of the directive without having to be aware of its outer state. For example, consider: @smallexample +@group .begin no-transform L: add a0, a1, a2 +@end group .begin transform M: add a0, a1, a2 .end transform +@group N: add a0, a1, a2 .end no-transform +@end group @end smallexample The @code{ADD} opcodes at @code{L} and @code{N} in the outer @@ -546,8 +574,10 @@ The @code{schedule} directive is recognized only for compatibility with Tensilica's assembler. @smallexample +@group .begin [no-]schedule .end [no-]schedule +@end group @end smallexample This directive is ignored and has no effect on @command{@value{AS}}. @@ -561,8 +591,10 @@ The @code{longcalls} directive enables or disables function call relaxation. @xref{Xtensa Call Relaxation, ,Function Call Relaxation}. @smallexample +@group .begin [no-]longcalls .end [no-]longcalls +@end group @end smallexample Call relaxation is disabled by default unless the @samp{--longcalls} @@ -579,8 +611,10 @@ including relaxation (@pxref{Xtensa Relaxation, ,Xtensa Relaxation}) and optimization (@pxref{Xtensa Optimizations, ,Xtensa Optimizations}). @smallexample +@group .begin [no-]transform .end [no-]transform +@end group @end smallexample Transformations are enabled by default unless the @samp{--no-transform} @@ -608,9 +642,11 @@ the literal data in the most appropriate place and possibly to combine identical literals. For example, the code: @smallexample +@group entry sp, 40 .literal .L1, sym l32r a4, .L1 +@end group @end smallexample can be used to load a pointer to the symbol @code{sym} into register @@ -708,13 +744,17 @@ for @samp{M} will automatically be aligned correctly and is placed after the unconditional jump. @smallexample +@group .global M code_start: +@end group j continue .literal_position .align 4 +@group continue: movi a4, M +@end group @end smallexample @node Literal Prefix Directive @@ -726,8 +766,10 @@ literal section names, which are derived from the names of the sections where the literals are defined. @smallexample +@group .begin literal_prefix [@var{name}] .end literal_prefix +@end group @end smallexample For literals defined within the delimited region, the literal section @@ -750,8 +792,10 @@ instructions. These are relevant only for Xtensa configurations that include the absolute addressing option for @code{L32R} instructions. @smallexample +@group .begin [no-]absolute-literals .end [no-]absolute-literals +@end group @end smallexample These directives do not change the @code{L32R} mode---they only cause |