From 0caa91fe1f0a60269d7af032118639303e6eddd6 Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Wed, 5 Jun 2013 07:55:33 -0700 Subject: tcg-arm: Implement tcg_register_jit Allows unwinding past the code_gen_buffer. Reviewed-by: Peter Maydell Signed-off-by: Richard Henderson --- tcg/arm/tcg-target.c | 76 +++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 67 insertions(+), 9 deletions(-) (limited to 'tcg/arm') diff --git a/tcg/arm/tcg-target.c b/tcg/arm/tcg-target.c index 4710046a4c..6c4854dbb0 100644 --- a/tcg/arm/tcg-target.c +++ b/tcg/arm/tcg-target.c @@ -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)); +} -- cgit v1.2.1