Hojun-Cho
d998425391
Unblock literal initialisers for str/slice/struct globals by wiring
an R_X86_64_64 relocation kind through both assembler and static
linker.
w6a:
- new A_DATAR directive, syntax `DATAR slot+off(SB),target(SB)`,
records an R_X86_64_64 reloc at slot+off in .data pointing at
target. The slot must be pre-defined by a prior DATAW;
- parse_operand learned the `name+disp(SB)` shape so the slot's
byte offset can be addressed explicitly;
- Areloc carries a `section` flag (0=.text / 1=.data) and obj.c
splits the reloc list into .rela.text and .rela.data, emitting
the latter conditionally with sh_info pointing at .data.
w6l:
- Lrel grows the same `section` flag; obj.c loads `.rela.data`
sections into the global reloc list with offsets shifted by
each input's data_off;
- pass.c handles R_X86_64_64: target VA is data_va+sym.val for
in_data symbols (else text_va+sym.val), addend is added, and
the 8-byte slot is patched in l->data (or l->text).
Inputs without DATAR are unaffected — bootstrap, 991 (selfhost .o
diff) and 992 (selfhost exe diff) keep their byte-identical
output. 520_datar covers the new path: asm a DATAW+DATAR pair,
verify .rela.data has exactly one R_X86_64_64 entry, link, run,
confirm the relocated pointer feeds a 5-byte write that prints
"hello".
Selfhost mirror + w6c emission for str/slice/struct literal init
land in follow-ups.
112 lines
2.3 KiB
C
112 lines
2.3 KiB
C
/*
|
|
* 6.out.h — amd64 instruction enum + register names. Mirrors the
|
|
* Plan 9 6c shape (cmd/6c/6.out.h) but trimmed to the subset that
|
|
* w6c emits and w6a consumes in this bootstrap. Each new opcode added
|
|
* here must also gain encoding support in cmd/w6a/asm.c.
|
|
*/
|
|
#ifndef SIX_OUT_H
|
|
#define SIX_OUT_H
|
|
|
|
/* registers — Plan 9 names; lowercase = 8-bit, etc. We use 64-bit. */
|
|
enum {
|
|
D_NONE = 0,
|
|
|
|
/* general purpose 64-bit */
|
|
D_AX, D_CX, D_DX, D_BX,
|
|
D_SP, D_BP, D_SI, D_DI,
|
|
D_R8, D_R9, D_R10, D_R11,
|
|
D_R12, D_R13, D_R14, D_R15,
|
|
|
|
/* SSE/XMM 64-bit float regs */
|
|
D_X0, D_X1, D_X2, D_X3,
|
|
D_X4, D_X5, D_X6, D_X7,
|
|
D_X8, D_X9, D_X10, D_X11,
|
|
D_X12, D_X13, D_X14, D_X15,
|
|
|
|
/* pseudo regs (Plan 9) */
|
|
D_PSP, /* SP pseudo (frame-relative) */
|
|
D_PFP, /* FP pseudo (incoming args) */
|
|
D_PSB, /* SB pseudo (static base) */
|
|
|
|
/* operand kinds; not registers but share the slot */
|
|
D_CONST, /* $N immediate */
|
|
D_BRANCH, /* label reference */
|
|
D_EXTERN, /* external symbol */
|
|
D_INDIR /* offset(reg) memory */
|
|
};
|
|
|
|
/* opcodes — the small set we currently emit & encode */
|
|
enum {
|
|
A_NOP = 0,
|
|
A_TEXT,
|
|
A_DATA,
|
|
A_DATAW, /* writable DATA: lands in .data (RW) instead of .text */
|
|
A_DATAR, /* reloc-only: patch a 64-bit slot in .data with a
|
|
* symbol's runtime VA. Pairs with a prior DATAW
|
|
* that left zero placeholder bytes. */
|
|
A_GLOBL,
|
|
A_END,
|
|
|
|
A_MOVQ,
|
|
A_MOVL,
|
|
A_MOVB,
|
|
A_MOVZBQ, /* movzx r64, r/m8 — load byte zero-extended */
|
|
A_MOVSXD, /* movsxd r64, r/m32 — load i32 sign-extended */
|
|
|
|
/* SSE2 scalar double-precision float */
|
|
A_MOVSD, /* xmm/m → xmm and xmm → m */
|
|
A_ADDSD,
|
|
A_SUBSD,
|
|
A_MULSD,
|
|
A_DIVSD,
|
|
A_UCOMISD,
|
|
A_CVTTSD2SI, /* truncate f64 → i64 */
|
|
A_CVTSI2SD, /* convert i64 → f64 */
|
|
|
|
/* SSE scalar single-precision float (f32). Same xmm regs. */
|
|
A_MOVSS,
|
|
A_ADDSS,
|
|
A_SUBSS,
|
|
A_MULSS,
|
|
A_DIVSS,
|
|
A_UCOMISS,
|
|
A_CVTTSS2SI,
|
|
A_CVTSI2SS,
|
|
A_CVTSD2SS, /* f64 → f32 truncate */
|
|
A_CVTSS2SD, /* f32 → f64 widen */
|
|
A_ADDQ,
|
|
A_SUBQ,
|
|
A_IMULQ,
|
|
A_IDIVQ,
|
|
A_DIVQ, /* unsigned 64-bit divide; sibling of IDIVQ */
|
|
A_NEGQ,
|
|
A_NOTQ,
|
|
A_ANDQ,
|
|
A_ORQ,
|
|
A_XORQ,
|
|
A_SHLQ,
|
|
A_SHRQ,
|
|
A_CMPQ,
|
|
|
|
A_PUSHQ,
|
|
A_POPQ,
|
|
A_LEAQ,
|
|
|
|
A_CALL,
|
|
A_RET,
|
|
A_JMP,
|
|
A_JE, A_JNE,
|
|
A_JL, A_JLE, A_JG, A_JGE,
|
|
A_JB, A_JBE, A_JA, A_JAE,
|
|
A_JZ, A_JNZ,
|
|
|
|
A_SYSCALL,
|
|
|
|
A_LAST
|
|
};
|
|
|
|
const char *anames(int); /* opcode -> mnemonic */
|
|
const char *rnames(int); /* register -> name */
|
|
|
|
#endif
|