Signed-off-by: Richard Henderson <r...@twiddle.net>
---
tcg/aarch64/tcg-target.c | 93 ++++++++++++++++++++++++++++++++++++------------
1 file changed, 70 insertions(+), 23 deletions(-)
diff --git a/tcg/aarch64/tcg-target.c b/tcg/aarch64/tcg-target.c
index 335a5d0..7d2fd99 100644
--- a/tcg/aarch64/tcg-target.c
+++ b/tcg/aarch64/tcg-target.c
@@ -1930,30 +1930,27 @@ static void tcg_target_init(TCGContext *s)
tcg_add_target_add_op_defs(aarch64_op_defs);
}
+/* Saving pairs: (X19, X20) .. (X27, X28), (X29(fp), X30(lr)). */
+#define PUSH_SIZE ((30 - 19 + 1) * 8)
+
+#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 - 1))
+
static void tcg_target_qemu_prologue(TCGContext *s)
{
- /* NB: frame sizes are in 16 byte stack units! */
- int frame_size_callee_saved, frame_size_tcg_locals;
TCGReg r;
- /* save pairs (FP, LR) and (X19, X20) .. (X27, X28) */
- frame_size_callee_saved = (1) + (TCG_REG_X28 - TCG_REG_X19) / 2 + 1;
-
- /* frame size requirement for TCG local variables */
- frame_size_tcg_locals = TCG_STATIC_CALL_ARGS_SIZE
- + CPU_TEMP_BUF_NLONGS * sizeof(long)
- + (TCG_TARGET_STACK_ALIGN - 1);
- frame_size_tcg_locals &= ~(TCG_TARGET_STACK_ALIGN - 1);
- frame_size_tcg_locals /= TCG_TARGET_STACK_ALIGN;
-
- /* push (FP, LR) and update sp */
- tcg_out_push_pair(s, TCG_REG_SP,
- TCG_REG_FP, TCG_REG_LR, frame_size_callee_saved);
+ /* Push (FP, LR) and allocate space for all saved registers. */
+ tcg_out_push_pair(s, TCG_REG_SP, TCG_REG_FP, TCG_REG_LR, PUSH_SIZE / 16);
/* FP -> callee_saved */
tcg_out_movr_sp(s, 1, TCG_REG_FP, TCG_REG_SP);
- /* store callee-preserved regs x19..x28 using FP -> callee_saved */
+ /* Store callee-preserved regs x19..x28. */
for (r = TCG_REG_X19; r <= TCG_REG_X27; r += 2) {
int idx = (r - TCG_REG_X19) / 2 + 1;
tcg_out_store_pair(s, TCG_REG_FP, r, r + 1, idx);
@@ -1961,7 +1958,7 @@ static void tcg_target_qemu_prologue(TCGContext *s)
/* Make stack space for TCG locals. */
tcg_fmt_Rdn_aimm(s, INSN_SUBI, 1, TCG_REG_SP, TCG_REG_SP,
- frame_size_tcg_locals * TCG_TARGET_STACK_ALIGN);
+ FRAME_SIZE - PUSH_SIZE);
/* inform TCG about how to find TCG locals with register, offset, size */
tcg_set_frame(s, TCG_REG_SP, TCG_STATIC_CALL_ARGS_SIZE,
@@ -1981,17 +1978,67 @@ static void tcg_target_qemu_prologue(TCGContext *s)
/* Remove TCG locals stack space. */
tcg_fmt_Rdn_aimm(s, INSN_ADDI, 1, TCG_REG_SP, TCG_REG_SP,
- frame_size_tcg_locals * TCG_TARGET_STACK_ALIGN);
+ FRAME_SIZE - PUSH_SIZE);
- /* restore registers x19..x28.
- FP must be preserved, so it still points to callee_saved area */
+ /* Restore callee-preserved registers x19..x28. */
for (r = TCG_REG_X19; r <= TCG_REG_X27; r += 2) {
int idx = (r - TCG_REG_X19) / 2 + 1;
tcg_out_load_pair(s, TCG_REG_FP, r, r + 1, idx);
}
- /* pop (FP, LR), restore SP to previous frame, return */
- tcg_out_pop_pair(s, TCG_REG_SP,
- TCG_REG_FP, TCG_REG_LR, frame_size_callee_saved);
+ /* Pop (FP, LR), restore SP to previous frame, return. */
+ tcg_out_pop_pair(s, TCG_REG_SP, TCG_REG_FP, TCG_REG_LR, PUSH_SIZE / 16);
tcg_out_ret(s, TCG_REG_LR);
}
+
+typedef struct {
+ DebugFrameCIE cie;
+ DebugFrameFDEHeader fde;
+ uint8_t fde_def_cfa[4];
+ uint8_t fde_reg_ofs[24];
+} DebugFrame;
+
+/* We're expecting a 2 byte uleb128 encoded value. */
+QEMU_BUILD_BUG_ON(FRAME_SIZE >= (1 << 14));
+
+#define ELF_HOST_MACHINE EM_AARCH64
+
+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 = 0x78, /* sleb128 -8 */
+ .cie.return_column = 16,
+
+ /* Total FDE size does not include the "len" member. */
+ .fde.len = sizeof(DebugFrame) - offsetof(DebugFrame, fde.cie_offset),
+
+ .fde_def_cfa = {
+ 12, 7, /* DW_CFA_def_cfa %rsp, ... */
+ (FRAME_SIZE & 0x7f) | 0x80, /* ... uleb128 FRAME_SIZE */
+ (FRAME_SIZE >> 7)
+ },
+ .fde_reg_ofs = {
+ 0x80 + 30, 1, /* DW_CFA_offset, lr, -8 */
+ 0x80 + 29, 2, /* DW_CFA_offset, fp, -16 */
+ 0x80 + 28, 3, /* DW_CFA_offset, x28, -24 */
+ 0x80 + 27, 4, /* DW_CFA_offset, x27, -32 */
+ 0x80 + 26, 5, /* DW_CFA_offset, x26, -40 */
+ 0x80 + 25, 6, /* DW_CFA_offset, x25, -48 */
+ 0x80 + 24, 7, /* DW_CFA_offset, x24, -56 */
+ 0x80 + 23, 8, /* DW_CFA_offset, x23, -64 */
+ 0x80 + 22, 9, /* DW_CFA_offset, x22, -72 */
+ 0x80 + 21, 10, /* DW_CFA_offset, x21, -80 */
+ 0x80 + 20, 11, /* DW_CFA_offset, x20, -88 */
+ 0x80 + 19, 12, /* DW_CFA_offset, x1p, -96 */
+ }
+};
+
+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));
+}
--
1.8.3.1
