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tccasm: Implement .pushsection and .popsection

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This commit is contained in:
Michael Matz 2016-06-28 15:11:06 +02:00
parent 6763b02abc
commit c82e52d55b
4 changed files with 40 additions and 3 deletions
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4
tcc.h
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@ -448,8 +448,8 @@ typedef struct Section {
int nb_hashed_syms; /* used to resize the hash table */ int nb_hashed_syms; /* used to resize the hash table */
struct Section *link; /* link to another section */ struct Section *link; /* link to another section */
struct Section *reloc; /* corresponding section for relocation, if any */ struct Section *reloc; /* corresponding section for relocation, if any */
struct Section *hash; /* hash table for symbols */ struct Section *hash; /* hash table for symbols */
struct Section *next; struct Section *prev; /* previous section on section stack */
char name[1]; /* section name */ char name[1]; /* section name */
} Section; } Section;

27
tccasm.c
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@ -335,6 +335,22 @@ static void use_section(TCCState *s1, const char *name)
use_section1(s1, sec); use_section1(s1, sec);
} }
static void push_section(TCCState *s1, const char *name)
{
Section *sec = find_section(s1, name);
sec->prev = cur_text_section;
use_section1(s1, sec);
}
static void pop_section(TCCState *s1)
{
Section *prev = cur_text_section->prev;
if (!prev)
tcc_error(".popsection without .pushsection");
cur_text_section->prev = NULL;
use_section1(s1, prev);
}
static void asm_parse_directive(TCCState *s1) static void asm_parse_directive(TCCState *s1)
{ {
int n, offset, v, size, tok1; int n, offset, v, size, tok1;
@ -683,10 +699,12 @@ static void asm_parse_directive(TCCState *s1)
next(); next();
} }
break; break;
case TOK_ASMDIR_pushsection:
case TOK_ASMDIR_section: case TOK_ASMDIR_section:
{ {
char sname[256]; char sname[256];
tok1 = tok;
/* XXX: support more options */ /* XXX: support more options */
next(); next();
sname[0] = '\0'; sname[0] = '\0';
@ -711,7 +729,10 @@ static void asm_parse_directive(TCCState *s1)
} }
} }
last_text_section = cur_text_section; last_text_section = cur_text_section;
use_section(s1, sname); if (tok1 == TOK_ASMDIR_section)
use_section(s1, sname);
else
push_section(s1, sname);
} }
break; break;
case TOK_ASMDIR_previous: case TOK_ASMDIR_previous:
@ -725,6 +746,10 @@ static void asm_parse_directive(TCCState *s1)
last_text_section = sec; last_text_section = sec;
} }
break; break;
case TOK_ASMDIR_popsection:
next();
pop_section(s1);
break;
#ifdef TCC_TARGET_I386 #ifdef TCC_TARGET_I386
case TOK_ASMDIR_code16: case TOK_ASMDIR_code16:
{ {

2
tcctok.h
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@ -323,6 +323,8 @@
DEF_ASMDIR(data) DEF_ASMDIR(data)
DEF_ASMDIR(bss) DEF_ASMDIR(bss)
DEF_ASMDIR(previous) DEF_ASMDIR(previous)
DEF_ASMDIR(pushsection)
DEF_ASMDIR(popsection)
DEF_ASMDIR(fill) DEF_ASMDIR(fill)
DEF_ASMDIR(rept) DEF_ASMDIR(rept)
DEF_ASMDIR(endr) DEF_ASMDIR(endr)

10
tests/asmtest.S
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@ -717,6 +717,16 @@ ft1: ft2: ft3: ft4: ft5: ft6: ft7: ft8: ft9:
.endr .endr
.fill 4,1,0x90 .fill 4,1,0x90
.section .text.one,"ax"
nop
.previous
.pushsection .text.one,"ax"
nop
.pushsection .text.two,"ax"
nop
.popsection
.popsection
movd %esi, %mm1 movd %esi, %mm1
movd %edi, %xmm2 movd %edi, %xmm2
movd (%ebx), %mm3 movd (%ebx), %mm3