derek.holloway
7502bf64a4
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72 lines
2.5 KiB
ArmAsm
72 lines
2.5 KiB
ArmAsm
// COM: An unresolved register call may target any original text instruction.
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// COM: In particular, it can target the second of two adjacent far patch sites.
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// COM: The rewriter must not coalesce those sites or consume original .text
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// COM: gateway space. This object has no safe target-independent route to the
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// COM: far trampoline pool, so it must fail closed instead of returning a
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// COM: successful object whose register call lands on rewritten padding.
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// RUN: %clang -target amdgcn-amd-amdhsa -mcpu=gfx1250 -nostdlib %s -o %t.elf
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// RUN: env AMD_COMGR_EMIT_VERBOSE_LOGS=1 hotswap-rewrite %t.elf \
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// RUN: amdgcn-amd-amdhsa--gfx1250 amdgcn-amd-amdhsa--gfx1250 \
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// RUN: --expect-status ERROR 2>&1 \
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// RUN: | %FileCheck --check-prefixes=LOG,API %s
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// LOG: hotswap: unresolved control-flow target disables NOP-sled emission,
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// LOG-SAME: trampoline coalescing, source relocation, and .text gateways
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// LOG: hotswap: error: no safe short-branch gateway for far site
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// API: RESULT: ERROR
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.amdgcn_target "amdgcn-amd-amdhsa--gfx1250"
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.text
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.globl test_indirect_call_far
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.p2align 8
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.type test_indirect_call_far,@function
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test_indirect_call_far:
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// s_get_pc_i64 returns the address of the following instruction. The add
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// therefore makes s[2:3] point at the second DS instruction below.
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s_get_pc_i64 s[2:3]
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s_add_co_u32 s2, s2, 20
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s_add_co_ci_u32 s3, s3, 0
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s_swap_pc_i64 s[0:1], s[2:3]
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ds_load_2addr_stride64_b64 v[0:3], v4 offset0:1 offset1:2
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.Lindirect_target:
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ds_load_2addr_stride64_b64 v[4:7], v8 offset0:3 offset1:4
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s_wait_dscnt 0x0
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s_endpgm
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.size test_indirect_call_far, .-test_indirect_call_far
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// Ordinarily this external zero-filled space can host long-branch gateways.
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// An unresolved target could also land here, so the conservative path cannot
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// consume it.
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.fill 64, 1, 0
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// Push the appended trampoline pool beyond s_branch's signed 16-bit dword
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// range so success would require coalescing, relocation, or a .text gateway.
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.rept 40000
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s_mov_b32 s0, s1
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.endr
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.rodata
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.p2align 8
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.amdhsa_kernel test_indirect_call_far
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.amdhsa_next_free_vgpr 9
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.amdhsa_next_free_sgpr 4
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.end_amdhsa_kernel
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.amdgpu_metadata
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amdhsa.version:
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- 3
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- 0
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amdhsa.kernels:
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- .name: test_indirect_call_far
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.symbol: test_indirect_call_far.kd
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.sgpr_count: 4
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.vgpr_count: 9
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.kernarg_segment_size: 0
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.group_segment_fixed_size: 0
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.private_segment_fixed_size: 0
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.kernarg_segment_align: 8
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.wavefront_size: 64
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.max_flat_workgroup_size: 256
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.end_amdgpu_metadata
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