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[libc][thumb] support syscalls from thumb mode #96558

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merged 1 commit into from
Jun 25, 2024
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[libc][thumb] support syscalls from thumb mode #96558

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26 changes: 19 additions & 7 deletions libc/src/__support/OSUtil/linux/arm/syscall.h
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Original file line number Diff line number Diff line change
Expand Up @@ -12,14 +12,29 @@
#include "src/__support/common.h"

#ifdef __thumb__
#error "The arm syscall implementation does not yet support thumb flavor."
#endif // __thumb__
#define R7 long r7 = number
#define SYSCALL_INSTR(input_constraint) \
int temp; \
LIBC_INLINE_ASM(R"(
mov %[temp], r7
mov r7, %2
svc #0
mov r7, %[temp]
)" \
: "=r"(r0), [temp] "=&r"(temp) \
: input_constraint \
: "memory", "cc")
#else
#define R7 register long r7 asm("r7") = number
#define SYSCALL_INSTR(input_constraint) \
LIBC_INLINE_ASM("svc 0" : "=r"(r0) : input_constraint : "memory", "cc")
#endif

#define REGISTER_DECL_0 \
register long r7 __asm__("r7") = number; \
R7; \
register long r0 __asm__("r0");
#define REGISTER_DECL_1 \
register long r7 __asm__("r7") = number; \
R7; \
register long r0 __asm__("r0") = arg1;
#define REGISTER_DECL_2 \
REGISTER_DECL_1 \
Expand All @@ -45,9 +60,6 @@
#define REGISTER_CONSTRAINT_5 REGISTER_CONSTRAINT_4, "r"(r4)
#define REGISTER_CONSTRAINT_6 REGISTER_CONSTRAINT_5, "r"(r5)

#define SYSCALL_INSTR(input_constraint) \
LIBC_INLINE_ASM("svc 0" : "=r"(r0) : input_constraint : "memory", "cc")

namespace LIBC_NAMESPACE {

LIBC_INLINE long syscall_impl(long number) {
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