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cosmopolitan/ape/macros.internal.h

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Initial import
2020-06-15 14:18:57 +00:00
#ifndef APE_MACROS_H_
#define APE_MACROS_H_
#include "libc/macros.h"
#ifdef __ASSEMBLER__
/* clang-format off */
/**
* @fileoverview Macros relevant to αcτµαlly pδrταblε εxεcµταblε.
*/
/ Calls near (i.e. pc+pcrel<64kB) FUNCTION.
/ @mode long,legacy,real
/ @cost 9 bytes overhead
.macro rlcall function:req
.byte 0x50 # push %[er]ax
.byte 0xb8,0,0 # mov $?,%[e]ax
jmp 911f
.byte 0x58 # pop %[er]ax
.byte 0xe8 # call Jvds
.long \function\()-.-4
jmp 912f
911: .byte 0x58 # pop %[er]ax
.byte 0xe8 # call Jvds
.short \function\()-.-2
912:
.endm
/ Loads far (i.e. <1mb) abs constexpr ADDRESS into ES:DI+EDX+RDX.
/ @mode long,legacy,real
.macro movesdi address:req
.byte 0xbf # mov $0x????xxxx,%[e]di
.short \address>>4
.byte 0x8e,0xc7 # mov %di,%es
.byte 0xbf # mov $0x????xxxx,%[e]di
.short \address&0xf
jmp 297f
.byte 0xbf # mov $0x????xxxx,%edi
.long \address
297:
.endm
/ Loads 16-bit CONSTEXPR into Qw-register w/ optional zero-extend.
/ @mode long,legacy,real
.macro bbmov constexpr:req abcd abcd.hi:req abcd.lo:req
.ifnb \abcd
.if (\constexpr)<128 && (\constexpr)>=0
pushpop \constexpr,\abcd
.exitm
.endif
.endif
movb $(\constexpr)>>8&0xff,\abcd.hi
movb $(\constexpr)&0xff,\abcd.lo
.endm
/ Compares 16-bit CONSTEXPR with Qw-register.
/ @mode long,legacy,real
.macro bbcmp constexpr:req abcd.hi:req abcd.lo:req
cmpb $(\constexpr)>>8&0xff,\abcd.hi
jnz 387f
cmpb $(\constexpr)&0xff,\abcd.lo
387:
.endm
/ Adds 16-bit CONSTEXPR to Qw-register.
/ @mode long,legacy,real
.macro bbadd constexpr:req abcd.hi:req abcd.lo:req
addb $(\constexpr)&0xff,\abcd.lo
.if (\constexpr) != 0
adcb $(\constexpr)>>8&0xff,\abcd.hi
.endif
.endm
/ Subtracts 16-bit CONSTEXPR from Qw-register.
/ @mode long,legacy,real
.macro bbsub constexpr:req abcd.hi:req abcd.lo:req
subb $(\constexpr)&0xff,\abcd.lo
.if (\constexpr) != 0
sbbb $(\constexpr)>>8&0xff,\abcd.hi
.endif
.endm
/ Ands Qw-register with 16-bit CONSTEXPR.
/ @mode long,legacy,real
.macro bband constexpr:req abcd.hi:req abcd.lo:req
.if ((\constexpr)&0xff) != 0xff || ((\constexpr)>>8&0xff) == 0xff
andb $(\constexpr)&0xff,\abcd.lo
.endif
.if ((\constexpr)>>8&0xff) != 0xff
andb $(\constexpr)>>8&0xff,\abcd.hi
.endif
.endm
/ Ors Qw-register with 16-bit CONSTEXPR.
/ @mode long,legacy,real
.macro bbor constexpr:req abcd.hi:req abcd.lo:req
.if ((\constexpr)&0xff) != 0 || ((\constexpr)>>8&0xff) != 0
orb $(\constexpr)&0xff,\abcd.lo
.endif
.if ((\constexpr)>>8&0xff) != 0
orb $(\constexpr)>>8&0xff,\abcd.hi
.endif
.endm
/ Performs ACTION only if in real mode.
/ @mode long,legacy,real
.macro rlo clobber:req action:vararg
990: mov $0,\clobber
.if .-990b!=3
.error "bad clobber or assembler mode"
.endif
991: \action
.rept 2-(.-991b)
nop
.endr
.if .-991b!=2
.error "ACTION must be 1-2 bytes"
.endif
.endm
/ Initializes real mode stack.
/ The most holiest of holy code.
/ @mode real
/ @see www.pcjs.org/pubs/pc/reference/intel/8086/
.macro rlstack seg:req addr:req
cli
mov \seg,%ss
mov \addr,%sp
sti
.endm
/ Symbolic Linker-Defined Binary Content.
.macro .stub name:req kind:req default type=@object
.ifnb \default
.equ \name,\default
.endif
.\kind \name
.type \name,\type
.weak \name
.hidden \name
.endm
/ Symbolic Linker-Defined Binary-Encoded-Bourne Content.
/ @param units is the number of encoded 32-bit values to insert,
/ e.g. \000 can be encoded as 0x3030305c.
.macro .shstub name:req units:req
ss \name,0
.if \units>1
ss \name,1
.if \units>2
ss \name,2
ss \name,3
.if \units>4
ss \name,4
ss \name,5
ss \name,6
ss \name,7
.endif
.endif
.endif
.endm
.macro ss name n
.stub \name\()_bcs\n,long
.endm
/* clang-format on */
#elif defined(__LINKER__)
#define BCX_NIBBLE(X) ((((X)&0xf) > 0x9) ? ((X)&0xf) + 0x37 : ((X)&0xf) + 0x30)
#define BCX_OCTET(X) ((BCX_NIBBLE((X) >> 4) << 8) | (BCX_NIBBLE((X) >> 0) << 0))
#define BCX_INT16(X) ((BCX_OCTET((X) >> 8) << 16) | (BCX_OCTET((X) >> 0) << 0))
#define BCXSTUB(SYM, X) \
HIDDEN(SYM##_bcx0 = BCX_INT16((X) >> 48)); \
HIDDEN(SYM##_bcx1 = BCX_INT16((X) >> 32)); \
HIDDEN(SYM##_bcx2 = BCX_INT16((X) >> 16)); \
HIDDEN(SYM##_bcx3 = BCX_INT16((X) >> 0))
/**
* Binary coded backslash octet support.
*
* <p>This allows linker scripts to generate printf commands.
*/
#define BCO_OCTET(X) (((X)&0x7) + 0x30)
#define BCOB_UNIT(X) \
((BCO_OCTET((X) >> 0) << 24) | (BCO_OCTET((X) >> 3) << 16) | \
(BCO_OCTET(((X)&0xff) >> 6) << 8) | 0x5c)
#define PFBYTE(SYM, X, I) HIDDEN(SYM##_bcs##I = BCOB_UNIT((X) >> ((I)*8)))
#define PFSTUB2(SYM, X) \
HIDDEN(SYM = (X)); \
PFBYTE(SYM, X, 0); \
PFBYTE(SYM, X, 1)
#define PFSTUB4(SYM, X) \
PFSTUB2(SYM, X); \
PFBYTE(SYM, X, 2); \
PFBYTE(SYM, X, 3)
#define PFSTUB8(SYM, X) \
PFSTUB4(SYM, X); \
PFBYTE(SYM, X, 4); \
PFBYTE(SYM, X, 5); \
PFBYTE(SYM, X, 6); \
PFBYTE(SYM, X, 7)
/**
* Binary coded decimal support.
*
* <p>This allows linker scripts to generate dd commands. Leading spaces
* need to be inserted so Mac doesn't consider them octal; therefore,
* parameters must be quoted; and eight digits should be good enough.
*/
#define SHSTUB2(SYM, X) \
HIDDEN(SYM##_bcs0 = BCD10K(X)); \
HIDDEN(SYM##_bcs1 = BCD(X))
#define BCD(X) \
((X) == 0 \
? 0x20202030 \
: (X) < 10 ? 0x30202020 + (((X) % 10) << 24) \
: (X) < 100 ? 0x30302020 + (((X) % 10) << 24) + \
(((X) / 10 % 10) << 16) \
: (X) < 1000 ? 0x30303020 + (((X) % 10) << 24) + \
(((X) / 10 % 10) << 16) + \
(((X) / 100 % 10) << 8) \
: 0x30303030 + (((X) % 10) << 24) + \
(((X) / 10 % 10) << 16) + \
(((X) / 100 % 10) << 8) + \
(((X) / 1000 % 10) << 0))
#define BCD10K(X) \
((X) < 10000 \
? 0x20202020 \
: (X) < 100000 \
? 0x30202020 + (((X) / 10000 % 10) << 24) \
: (X) < 1000000 \
? 0x30302020 + (((X) / 10000 % 10) << 24) + \
(((X) / 100000 % 10) << 16) \
: (X) < 10000000 \
? 0x30303020 + (((X) / 10000 % 10) << 24) + \
(((X) / 100000 % 10) << 16) + \
(((X) / 1000000 % 10) << 8) \
: (X) < 100000000 \
? 0x30303030 + (((X) / 10000 % 10) << 24) + \
(((X) / 100000 % 10) << 16) + \
(((X) / 1000000 % 10) << 8) + \
(((X) / 10000000 % 10) << 0) \
: 0xffffffffffffffff)
#endif /* __ASSEMBLER__ */
#endif /* APE_MACROS_H_ */