#include "gdb_string.h"
#include "solib.h"
#include "solib-irix.h"
-
#include "elf-bfd.h"
+#include "mips-tdep.h"
+#include "trad-frame.h"
+#include "tramp-frame.h"
static void
mips_irix_elf_osabi_sniff_abi_tag_sections (bfd *abfd, asection *sect,
return osabi;
}
+/* Unwinding past the signal handler on mips-irix.
+
+ Note: The following has only been tested with N32, but can probably
+ be made to work with a small number of adjustments.
+
+ On mips-irix, the sigcontext_t structure is stored at the base
+ of the frame established by the _sigtramp function. The definition
+ of this structure can be found in <sys/signal.h> (comments have been
+ C++'ified to avoid a collision with the C-style comment delimiters
+ used by this comment):
+
+ typedef struct sigcontext {
+ __uint32_t sc_regmask; // regs to restore in sigcleanup
+ __uint32_t sc_status; // cp0 status register
+ __uint64_t sc_pc; // pc at time of signal
+ // General purpose registers
+ __uint64_t sc_regs[32]; // processor regs 0 to 31
+ // Floating point coprocessor state
+ __uint64_t sc_fpregs[32]; // fp regs 0 to 31
+ __uint32_t sc_ownedfp; // fp has been used
+ __uint32_t sc_fpc_csr; // fpu control and status reg
+ __uint32_t sc_fpc_eir; // fpu exception instruction reg
+ // implementation/revision
+ __uint32_t sc_ssflags; // signal stack state to restore
+ __uint64_t sc_mdhi; // Multiplier hi and low regs
+ __uint64_t sc_mdlo;
+ // System coprocessor registers at time of signal
+ __uint64_t sc_cause; // cp0 cause register
+ __uint64_t sc_badvaddr; // cp0 bad virtual address
+ __uint64_t sc_triggersave; // state of graphics trigger (SGI)
+ sigset_t sc_sigset; // signal mask to restore
+ __uint64_t sc_fp_rounded_result; // for Ieee 754 support
+ __uint64_t sc_pad[31];
+ } sigcontext_t;
+
+ The following macros provide the offset of some of the fields
+ used to retrieve the value of the registers before the signal
+ was raised. */
+
+/* The size of the sigtramp frame. The sigtramp frame base can then
+ be computed by adding this size to the SP. */
+#define SIGTRAMP_FRAME_SIZE 48
+/* The offset in sigcontext_t where the PC is saved. */
+#define SIGCONTEXT_PC_OFF 8
+/* The offset in sigcontext_t where the GP registers are saved. */
+#define SIGCONTEXT_REGS_OFF (SIGCONTEXT_PC_OFF + 8)
+/* The offset in sigcontext_t where the FP regsiters are saved. */
+#define SIGCONTEXT_FPREGS_OFF (SIGCONTEXT_REGS_OFF + 32 * 8)
+/* The offset in sigcontext_t where the FP CSR register is saved. */
+#define SIGCONTEXT_FPCSR_OFF (SIGCONTEXT_FPREGS_OFF + 32 * 8 + 4)
+/* The offset in sigcontext_t where the multiplier hi register is saved. */
+#define SIGCONTEXT_HI_OFF (SIGCONTEXT_FPCSR_OFF + 2 * 4)
+/* The offset in sigcontext_t where the multiplier lo register is saved. */
+#define SIGCONTEXT_LO_OFF (SIGCONTEXT_HI_OFF + 4)
+
+/* Implement the "init" routine in struct tramp_frame for the N32 ABI
+ on mips-irix. */
+static void
+mips_irix_n32_tramp_frame_init (const struct tramp_frame *self,
+ struct frame_info *this_frame,
+ struct trad_frame_cache *this_cache,
+ CORE_ADDR func)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ const int num_regs = gdbarch_num_regs (gdbarch);
+ int sp_cooked_regno = num_regs + MIPS_SP_REGNUM;
+ const CORE_ADDR sp = get_frame_register_signed (this_frame, sp_cooked_regno);
+ const CORE_ADDR sigcontext_base = sp + 48;
+ const struct mips_regnum *regs = mips_regnum (gdbarch);
+ int ireg;
+
+ trad_frame_set_reg_addr (this_cache, regs->pc + gdbarch_num_regs (gdbarch),
+ sigcontext_base + SIGCONTEXT_PC_OFF);
+
+ for (ireg = 1; ireg < 32; ireg++)
+ trad_frame_set_reg_addr (this_cache, ireg + MIPS_ZERO_REGNUM + num_regs,
+ sigcontext_base + SIGCONTEXT_REGS_OFF + ireg * 8);
+
+ for (ireg = 0; ireg < 32; ireg++)
+ trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + num_regs,
+ sigcontext_base + SIGCONTEXT_FPREGS_OFF
+ + ireg * 8);
+
+ trad_frame_set_reg_addr (this_cache, regs->fp_control_status + num_regs,
+ sigcontext_base + SIGCONTEXT_FPCSR_OFF);
+
+ trad_frame_set_reg_addr (this_cache, regs->hi + num_regs,
+ sigcontext_base + SIGCONTEXT_HI_OFF);
+
+ trad_frame_set_reg_addr (this_cache, regs->lo + num_regs,
+ sigcontext_base + SIGCONTEXT_LO_OFF);
+
+ trad_frame_set_id (this_cache, frame_id_build (sigcontext_base, func));
+}
+
+/* The tramp_frame structure describing sigtramp frames on mips-irix N32.
+
+ Note that the list of instructions below is pretty much a pure dump
+ of function _sigtramp on mips-irix. A few instructions are actually
+ not tested (mask set to 0), because a portion of these instructions
+ contain an address which changes due to relocation. We could use
+ a smarter mask that checks the instrutction code alone, but given
+ the number of instructions already being checked, this seemed
+ unnecessary. */
+
+static const struct tramp_frame mips_irix_n32_tramp_frame =
+{
+ SIGTRAMP_FRAME,
+ 4,
+ {
+ { 0x3c0c8000, -1 }, /* lui t0,0x8000 */
+ { 0x27bdffd0, -1 }, /* addiu sp,sp,-48 */
+ { 0x008c6024, -1 }, /* and t0,a0,t0 */
+ { 0xffa40018, -1 }, /* sd a0,24(sp) */
+ { 0x00000000, 0 }, /* beqz t0,0xfaefcb8 <_sigtramp+40> */
+ { 0xffa60028, -1 }, /* sd a2,40(sp) */
+ { 0x01806027, -1 }, /* nor t0,t0,zero */
+ { 0xffa00020, -1 }, /* sd zero,32(sp) */
+ { 0x00000000, 0 }, /* b 0xfaefcbc <_sigtramp+44> */
+ { 0x008c2024, -1 }, /* and a0,a0,t0 */
+ { 0xffa60020, -1 }, /* sd a2,32(sp) */
+ { 0x03e0c025, -1 }, /* move t8,ra */
+ { 0x00000000, 0 }, /* bal 0xfaefcc8 <_sigtramp+56> */
+ { 0x00000000, -1 }, /* nop */
+ { 0x3c0c0007, -1 }, /* lui t0,0x7 */
+ { 0x00e0c825, -1 }, /* move t9,a3 */
+ { 0x658c80fc, -1 }, /* daddiu t0,t0,-32516 */
+ { 0x019f602d, -1 }, /* daddu t0,t0,ra */
+ { 0x0300f825, -1 }, /* move ra,t8 */
+ { 0x8d8c9880, -1 }, /* lw t0,-26496(t0) */
+ { 0x8d8c0000, -1 }, /* lw t0,0(t0) */
+ { 0x8d8d0000, -1 }, /* lw t1,0(t0) */
+ { 0xffac0008, -1 }, /* sd t0,8(sp) */
+ { 0x0320f809, -1 }, /* jalr t9 */
+ { 0xffad0010, -1 }, /* sd t1,16(sp) */
+ { 0xdfad0010, -1 }, /* ld t1,16(sp) */
+ { 0xdfac0008, -1 }, /* ld t0,8(sp) */
+ { 0xad8d0000, -1 }, /* sw t1,0(t0) */
+ { 0xdfa40020, -1 }, /* ld a0,32(sp) */
+ { 0xdfa50028, -1 }, /* ld a1,40(sp) */
+ { 0xdfa60018, -1 }, /* ld a2,24(sp) */
+ { 0x24020440, -1 }, /* li v0,1088 */
+ { 0x0000000c, -1 }, /* syscall */
+ { TRAMP_SENTINEL_INSN, -1 }
+ },
+ mips_irix_n32_tramp_frame_init
+};
+
static void
mips_irix_init_abi (struct gdbarch_info info,
struct gdbarch *gdbarch)
{
set_solib_ops (gdbarch, &irix_so_ops);
+ tramp_frame_prepend_unwinder (gdbarch, &mips_irix_n32_tramp_frame);
}
/* Provide a prototype to silence -Wmissing-prototypes. */
projects / binutils-gdb.git / commitdiff