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tcg-arm: Implement tcg_register_jit

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Allows unwinding past the code_gen_buffer.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-06-05 07:55:33 -07:00
parent b5cc476da7
commit 0caa91fe1f
1 changed files with 67 additions and 9 deletions
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76
tcg/arm/tcg-target.c
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@ -2088,23 +2088,31 @@ static inline void tcg_out_movi(TCGContext *s, TCGType type,
tcg_out_movi32(s, COND_AL, ret, arg);
}
/* Compute frame size via macros, to share between tcg_target_qemu_prologue
and tcg_register_jit. */
#define PUSH_SIZE ((11 - 4 + 1 + 1) * sizeof(tcg_target_long))
#define FRAME_SIZE \
((PUSH_SIZE \
+ TCG_STATIC_CALL_ARGS_SIZE \
+ CPU_TEMP_BUF_NLONGS * sizeof(long) \
+ TCG_TARGET_STACK_ALIGN - 1) \
& -TCG_TARGET_STACK_ALIGN)
static void tcg_target_qemu_prologue(TCGContext *s)
{
int frame_size;
int stack_addend;
/* Calling convention requires us to save r4-r11 and lr. */
/* stmdb sp!, { r4 - r11, lr } */
tcg_out32(s, (COND_AL << 28) | 0x092d4ff0);
/* Allocate the local stack frame. */
frame_size = TCG_STATIC_CALL_ARGS_SIZE;
frame_size += CPU_TEMP_BUF_NLONGS * sizeof(long);
/* We saved an odd number of registers above; keep an 8 aligned stack. */
frame_size = ((frame_size + TCG_TARGET_STACK_ALIGN - 1)
& -TCG_TARGET_STACK_ALIGN) + 4;
/* Reserve callee argument and tcg temp space. */
stack_addend = FRAME_SIZE - PUSH_SIZE;
tcg_out_dat_rI(s, COND_AL, ARITH_SUB, TCG_REG_CALL_STACK,
TCG_REG_CALL_STACK, frame_size, 1);
TCG_REG_CALL_STACK, stack_addend, 1);
tcg_set_frame(s, TCG_REG_CALL_STACK, TCG_STATIC_CALL_ARGS_SIZE,
CPU_TEMP_BUF_NLONGS * sizeof(long));
@ -2115,8 +2123,58 @@ static void tcg_target_qemu_prologue(TCGContext *s)
/* Epilogue. We branch here via tb_ret_addr. */
tcg_out_dat_rI(s, COND_AL, ARITH_ADD, TCG_REG_CALL_STACK,
TCG_REG_CALL_STACK, frame_size, 1);
TCG_REG_CALL_STACK, stack_addend, 1);
/* ldmia sp!, { r4 - r11, pc } */
tcg_out32(s, (COND_AL << 28) | 0x08bd8ff0);
}
typedef struct {
DebugFrameCIE cie;
DebugFrameFDEHeader fde;
uint8_t fde_def_cfa[4];
uint8_t fde_reg_ofs[18];
} DebugFrame;
#define ELF_HOST_MACHINE EM_ARM
/* We're expecting a 2 byte uleb128 encoded value. */
QEMU_BUILD_BUG_ON(FRAME_SIZE >= (1 << 14));
static DebugFrame debug_frame = {
.cie.len = sizeof(DebugFrameCIE)-4, /* length after .len member */
.cie.id = -1,
.cie.version = 1,
.cie.code_align = 1,
.cie.data_align = 0x7c, /* sleb128 -4 */
.cie.return_column = 14,
/* Total FDE size does not include the "len" member. */
.fde.len = sizeof(DebugFrame) - offsetof(DebugFrame, fde.cie_offset),
.fde_def_cfa = {
12, 13, /* DW_CFA_def_cfa sp, ... */
(FRAME_SIZE & 0x7f) | 0x80, /* ... uleb128 FRAME_SIZE */
(FRAME_SIZE >> 7)
},
.fde_reg_ofs = {
/* The following must match the stmdb in the prologue. */
0x8e, 1, /* DW_CFA_offset, lr, -4 */
0x8b, 2, /* DW_CFA_offset, r11, -8 */
0x8a, 3, /* DW_CFA_offset, r10, -12 */
0x89, 4, /* DW_CFA_offset, r9, -16 */
0x88, 5, /* DW_CFA_offset, r8, -20 */
0x87, 6, /* DW_CFA_offset, r7, -24 */
0x86, 7, /* DW_CFA_offset, r6, -28 */
0x85, 8, /* DW_CFA_offset, r5, -32 */
0x84, 9, /* DW_CFA_offset, r4, -36 */
}
};
void tcg_register_jit(void *buf, size_t buf_size)
{
debug_frame.fde.func_start = (tcg_target_long) buf;
debug_frame.fde.func_len = buf_size;
tcg_register_jit_int(buf, buf_size, &debug_frame, sizeof(debug_frame));
}