forked from Imagelibrary/binutils-gdb
* minsyms.c: Include "target.h".
(find_solib_trampoline_target): Handle minimal symbols pointing to function descriptors as well. * Makefile.in (minsyms.o): Update dependencies. * ppc-linux-tdep.c (ppc64_standard_linkage): Rename to ... (ppc64_standard_linkage1): ... this. Fix optional instructions. (PPC64_STANDARD_LINKAGE_LEN): Rename to ... (PPC64_STANDARD_LINKAGE1_LEN): ... this. (ppc64_standard_linkage2, ppc64_standard_linkage3): New. (PPC64_STANDARD_LINKAGE2_LEN, PPC64_STANDARD_LINKAGE3_LEN): New. (ppc64_standard_linkage_target): Rename to ... (ppc64_standard_linkage1_target): ... this. (ppc64_standard_linkage2_target, ppc64_standard_linkage3_target): New. (ppc64_skip_trampoline_code): Support three variants of standard linkage stubs. Call find_solib_trampoline_target to handle glink stubs.
This commit is contained in:
Ulrich Weigand
@@ -331,7 +331,7 @@ ppc64_desc_entry_point (CORE_ADDR desc)
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/* Pattern for the standard linkage function. These are built by
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build_plt_stub in elf64-ppc.c, whose GLINK argument is always
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zero. */
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static struct insn_pattern ppc64_standard_linkage[] =
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static struct insn_pattern ppc64_standard_linkage1[] =
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{
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/* addis r12, r2, <any> */
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{ insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 },
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@@ -343,17 +343,16 @@ static struct insn_pattern ppc64_standard_linkage[] =
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{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 },
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/* addis r12, r12, 1 <optional> */
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{ insn_d (-1, -1, -1, -1), insn_d (15, 12, 2, 1), 1 },
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{ insn_d (-1, -1, -1, -1), insn_d (15, 12, 12, 1), 1 },
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/* ld r2, <any>(r12) */
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{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 12, 0, 0), 0 },
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/* addis r12, r12, 1 <optional> */
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{ insn_d (-1, -1, -1, -1), insn_d (15, 12, 2, 1), 1 },
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{ insn_d (-1, -1, -1, -1), insn_d (15, 12, 12, 1), 1 },
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/* mtctr r11 */
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{ insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467),
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0 },
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{ insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 },
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/* ld r11, <any>(r12) */
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{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 },
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@@ -363,8 +362,68 @@ static struct insn_pattern ppc64_standard_linkage[] =
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{ 0, 0, 0 }
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};
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#define PPC64_STANDARD_LINKAGE_LEN \
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(sizeof (ppc64_standard_linkage) / sizeof (ppc64_standard_linkage[0]))
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#define PPC64_STANDARD_LINKAGE1_LEN \
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(sizeof (ppc64_standard_linkage1) / sizeof (ppc64_standard_linkage1[0]))
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static struct insn_pattern ppc64_standard_linkage2[] =
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{
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/* addis r12, r2, <any> */
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{ insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 },
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/* std r2, 40(r1) */
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{ -1, insn_ds (62, 2, 1, 40, 0), 0 },
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/* ld r11, <any>(r12) */
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{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 },
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/* addi r12, r12, <any> <optional> */
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{ insn_d (-1, -1, -1, 0), insn_d (14, 12, 12, 0), 1 },
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/* mtctr r11 */
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{ insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 },
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/* ld r2, <any>(r12) */
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{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 12, 0, 0), 0 },
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/* ld r11, <any>(r12) */
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{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 },
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/* bctr */
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{ -1, 0x4e800420, 0 },
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{ 0, 0, 0 }
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};
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#define PPC64_STANDARD_LINKAGE2_LEN \
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(sizeof (ppc64_standard_linkage2) / sizeof (ppc64_standard_linkage2[0]))
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static struct insn_pattern ppc64_standard_linkage3[] =
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{
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/* std r2, 40(r1) */
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{ -1, insn_ds (62, 2, 1, 40, 0), 0 },
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/* ld r11, <any>(r2) */
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{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 0 },
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/* addi r2, r2, <any> <optional> */
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{ insn_d (-1, -1, -1, 0), insn_d (14, 2, 2, 0), 1 },
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/* mtctr r11 */
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{ insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 },
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/* ld r11, <any>(r2) */
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{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 0 },
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/* ld r2, <any>(r2) */
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{ insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 2, 0, 0), 0 },
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/* bctr */
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{ -1, 0x4e800420, 0 },
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{ 0, 0, 0 }
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};
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#define PPC64_STANDARD_LINKAGE3_LEN \
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(sizeof (ppc64_standard_linkage3) / sizeof (ppc64_standard_linkage3[0]))
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/* When the dynamic linker is doing lazy symbol resolution, the first
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call to a function in another object will go like this:
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@@ -413,8 +472,8 @@ static struct insn_pattern ppc64_standard_linkage[] =
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standard linkage function will send them. (This doesn't deal with
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dynamic linker lazy symbol resolution stubs.) */
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static CORE_ADDR
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ppc64_standard_linkage_target (struct frame_info *frame,
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CORE_ADDR pc, unsigned int *insn)
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ppc64_standard_linkage1_target (struct frame_info *frame,
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CORE_ADDR pc, unsigned int *insn)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (frame));
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@@ -430,20 +489,72 @@ ppc64_standard_linkage_target (struct frame_info *frame,
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return ppc64_desc_entry_point (desc);
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}
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static CORE_ADDR
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ppc64_standard_linkage2_target (struct frame_info *frame,
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CORE_ADDR pc, unsigned int *insn)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (frame));
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/* The address of the function descriptor this linkage function
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references. */
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CORE_ADDR desc
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= ((CORE_ADDR) get_frame_register_unsigned (frame,
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tdep->ppc_gp0_regnum + 2)
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+ (insn_d_field (insn[0]) << 16)
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+ insn_ds_field (insn[2]));
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/* The first word of the descriptor is the entry point. Return that. */
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return ppc64_desc_entry_point (desc);
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}
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static CORE_ADDR
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ppc64_standard_linkage3_target (struct frame_info *frame,
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CORE_ADDR pc, unsigned int *insn)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (frame));
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/* The address of the function descriptor this linkage function
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references. */
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CORE_ADDR desc
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= ((CORE_ADDR) get_frame_register_unsigned (frame,
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tdep->ppc_gp0_regnum + 2)
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+ insn_ds_field (insn[1]));
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/* The first word of the descriptor is the entry point. Return that. */
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return ppc64_desc_entry_point (desc);
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}
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/* Given that we've begun executing a call trampoline at PC, return
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the entry point of the function the trampoline will go to. */
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static CORE_ADDR
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ppc64_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
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{
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unsigned int ppc64_standard_linkage_insn[PPC64_STANDARD_LINKAGE_LEN];
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unsigned int ppc64_standard_linkage1_insn[PPC64_STANDARD_LINKAGE1_LEN];
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unsigned int ppc64_standard_linkage2_insn[PPC64_STANDARD_LINKAGE2_LEN];
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unsigned int ppc64_standard_linkage3_insn[PPC64_STANDARD_LINKAGE3_LEN];
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CORE_ADDR target;
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if (insns_match_pattern (pc, ppc64_standard_linkage,
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ppc64_standard_linkage_insn))
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return ppc64_standard_linkage_target (frame, pc,
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ppc64_standard_linkage_insn);
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if (insns_match_pattern (pc, ppc64_standard_linkage1,
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ppc64_standard_linkage1_insn))
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pc = ppc64_standard_linkage1_target (frame, pc,
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ppc64_standard_linkage1_insn);
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else if (insns_match_pattern (pc, ppc64_standard_linkage2,
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ppc64_standard_linkage2_insn))
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pc = ppc64_standard_linkage2_target (frame, pc,
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ppc64_standard_linkage2_insn);
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else if (insns_match_pattern (pc, ppc64_standard_linkage3,
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ppc64_standard_linkage3_insn))
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pc = ppc64_standard_linkage3_target (frame, pc,
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ppc64_standard_linkage3_insn);
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else
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return 0;
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/* The PLT descriptor will either point to the already resolved target
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address, or else to a glink stub. As the latter carry synthetic @plt
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symbols, find_solib_trampoline_target should be able to resolve them. */
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target = find_solib_trampoline_target (frame, pc);
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return target? target : pc;
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}
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