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Add arm64 alloca() support.

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kbkpbot 2025-11-19 17:14:22 +08:00
parent fa6a6bfbbd
commit 264229a0d4
2 changed files with 70 additions and 10 deletions
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2
lib/Makefile
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@ -38,7 +38,7 @@ XFLAGS += -I$(TOP)
I386_O = libtcc1.o alloca.o alloca-bt.o $(COMMON_O) I386_O = libtcc1.o alloca.o alloca-bt.o $(COMMON_O)
X86_64_O = libtcc1.o alloca.o alloca-bt.o $(COMMON_O) X86_64_O = libtcc1.o alloca.o alloca-bt.o $(COMMON_O)
ARM_O = libtcc1.o armeabi.o alloca.o armflush.o $(COMMON_O) ARM_O = libtcc1.o armeabi.o alloca.o armflush.o $(COMMON_O)
ARM64_O = lib-arm64.o $(COMMON_O) ARM64_O = lib-arm64.o alloca.o $(COMMON_O)
RISCV64_O = lib-arm64.o $(COMMON_O) RISCV64_O = lib-arm64.o $(COMMON_O)
COMMON_O = stdatomic.o atomic.o builtin.o COMMON_O = stdatomic.o atomic.o builtin.o
WIN_O = crt1.o crt1w.o wincrt1.o wincrt1w.o dllcrt1.o dllmain.o WIN_O = crt1.o crt1w.o wincrt1.o wincrt1w.o dllcrt1.o dllmain.o

78
lib/alloca.S
View File

@ -70,16 +70,76 @@ p3:
/* ---------------------------------------------- */ /* ---------------------------------------------- */
#elif defined __arm__ #elif defined __arm__
.text .text
.align 2 .align
.global alloca .global alloca
.type alloca, %function .type alloca, %function
alloca: alloca:
rsb sp, r0, sp rsb sp, r0, sp
bic sp, sp, #7 bic sp, sp, #7
mov r0, sp mov r0, sp
mov pc, lr mov pc, lr
.size alloca, .-alloca .size alloca, .-alloca
/* ---------------------------------------------- */ /* ---------------------------------------------- */
#elif defined __aarch64__ || defined __arm64__
.text
.align 2
.global alloca
.type alloca, %function
alloca:
#ifdef __TINYC__
.int 0x91003c00
.int 0x927cec00
#ifdef _WIN32
.int 0xb4000160
.int 0xd2820001
.int 0xeb01001f
.int 0x540000c3
.int 0xcb2163e2
.int 0xf940005f
.int 0xcb2163ff
.int 0xcb010000
.int 0x17fffffa
#endif
.int 0xb4000040
.int 0xcb2063ff
.int 0x910003e0
.int 0xd65f03c0
#else
add x0, x0, #15 // Round up to 16-byte boundary
and x0, x0, #-16 // Ensure 16-byte alignment
cbz x0, p100 // If size is 0, skip to return
#ifdef _WIN32
// Windows requires page-wise allocation with stack probing
mov x1, #4096 // Page size = 4096 bytes
p101:
cmp x0, x1 // Compare remaining size with page size
b.lo p102 // If less than page, jump to remainder
// Probe first, then allocate
sub x2, sp, x1 // Calculate guard page address (sp - 4096)
ldr xzr, [x2] // Touch guard page FIRST
sub sp, sp, x1 // THEN allocate the page
sub x0, x0, x1 // Decrement remaining size
b p101 // Continue loop
p102:
// Allocate remaining bytes (less than one page)
cbz x0, p100 // If no remaining bytes, skip
sub sp, sp, x0 // Allocate remaining space
#else
// Non-Windows: simple one-time allocation
sub sp, sp, x0 // Allocate space on stack
#endif
p100:
mov x0, sp // Return allocated address
ret // Return to caller
#endif
.size alloca, .-alloca
/* ---------------------------------------------- */
#endif #endif